Diagnostic codes and troubleshooting methods for the ECM Lada Largus

Table of fault codes

Code - Description

DF001 Coolant temperature sensor circuit
DF002 Air temperature sensor circuit
DF022 OBD warning light circuit
DF023 Coolant temperature warning light circuit
DF038 ECU
DF040 No. 1 injector circuit
DF041 No. 2 injector circuit
DF042 No. 3 injector circuit
DF043 No. 4 injector circuit
DF081 Canister Purge Solenoid Valve Circuit
DF082 Upstream oxygen sensor heating circuit
DF083 Downstream oxygen sensor heating circuit
DF084 Actuator relay control circuit
DF091 Vehicle speed information
DF092 Upstream oxygen sensor circuit
DF093 Downstream oxygen sensor circuit
DF123 Mixture misfires leading to an increase in the content of toxic substances in the exhaust gases
DF124 Misfire causing catalytic converter failure
DF232 Refrigerant Pressure Sensor Circuit
DF328 Throttle Position Sensor Circuit
DF330 Knock Sensor Circuit
DF336 Engine speed and position sensor circuit
DF352 Immobilizer Circuit
DF353 Absolute Pressure Sensor Circuit
DF360 Idle control circuit
DF361 No. 1 and No. 4 ignition coil circuit
DF362 No. 2 and No. 3 ignition coil circuit
DF378 Communication of the ABS computer with the injection computer
DF390 Oxygen sensor malfunction
DF394 Catalytic converter malfunction
DF514 Fuel pump relay circuit
DF524 Actuator relay output voltage
DF587 Supply voltage + 5V sensors

Fault code, fault decoding and troubleshooting

DF001 - Coolant Temperature Sensor Circuit

1 Open circuit or short circuit

Diagnostic hints

Priority in fault handling:

- First of all, deal with fault DF587 "Supply voltage +5 V sensors", if it is current or stored.

Diagnostic conditions for a stored fault:

- The fault is defined as current after a change in the coolant temperature value above the set limit.

After the condition is met, the fault should be defined as current, but can be defined as stored again.

Features:

If a current fault is found, use the procedure below to test the coolant temperature sensor circuit.

Check the connection and condition of the coolant temperature sensor connector. Troubleshoot if necessary.

Verify that the resistance of the coolant temperature sensor is not zero or infinity (i.e. there is no obvious malfunction).

Compare the sensor resistance values with the values given in the More Information section.

Check that the resistance of the sensor changes with temperature.

If necessary, replace the coolant temperature sensor.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU, terminal "13" - terminal "B1" of the coolant temperature sensor;
- ECU, terminal "73" - terminal "B2" of the coolant temperature sensor.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

After troubleshooting, perform: diagnostic instructions to confirm repair; process other faults detected by the diagnostic tool, and then delete the fault information from the computer memory; perform a compliance check.

DF002 - Air temperature sensor circuit

1 Open circuit or short circuit

Diagnostic hints

Priority in fault handling:

- First of all, deal with fault DF587 "Supply voltage +5 V sensors", if it is current or saved.

Diagnostic conditions for a stored fault:

The fault is defined as current after the air temperature value changes above the set limit.

After the condition is met, the fault should be defined as current, but can be defined as stored again.

Features:

If a current fault is found, use the procedure below to test the air temperature sensor circuit.

Check the connection and condition of the air temperature sensor connector.

Troubleshoot if necessary.

Check that the resistance of the air temperature sensor is not zero or infinity (i.e. there is no obvious malfunction).

Compare the sensor resistance values with the values given in the More Information section.

Check that the resistance of the sensor changes with temperature.

If necessary, replace the air temperature sensor.

Using a universal contact board, check for open and short circuits in the circuits:

ECU, terminal "49" - terminal "1" air temperature sensor;
ECU, terminal "77" - terminal "2" air temperature sensor.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

DF022 - OBD warning light circuit

Circuit open or short circuit
Chain break
Short to ground
Short to +12V

Diagnostic hints

Diagnostic conditions for a stored fault:

The fault is defined as current after command AC047

"Signal lamp of the OBD diagnostic system".

Features:

2/3/4 in current faults.

for any stored fault.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECM, terminal "34" - instrument cluster.

Troubleshoot if necessary.

Check for "+" 12 V at the OBD warning light contact.

Check the condition of the instrument cluster power fuses.

Troubleshoot if necessary.

If the problem persists, run a fault finding on the instrument cluster.

DF023 - Coolant temperature warning light circuit

Circuit open or short circuit
Chain break
Short to ground
Short to +12V

Diagnostic hints

Diagnostic conditions for a stored fault:

The fault is defined as current after the AC116 command is issued

"Coolant temperature warning light".

Features:

2/3/4 in current faults.

for any stored fault.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECU ECM, pin "9" - instrument cluster.

Troubleshoot if necessary.

Check for the presence of "+" 12 V at the contact of the alarm lamp for the emergency coolant temperature.

Check the condition of the instrument cluster power fuses.

Troubleshoot if necessary.

If the problem persists, run a fault finding on the instrument cluster.

DF038 - ECU

Diagnostic hints - None

Computer is defective or software does not match the vehicle.

Make sure that the ECU configuration matches the equipment installed on the vehicle.

If it does not match, then reprogram the computer.

If the problem persists, replace the computer.

After correcting the problem, carry out: a road test and then a recheck with the diagnostic tool; process other faults detected by the diagnostic tool, and then delete the fault information from the computer memory; perform a compliance check.

DF040 - No. 1 injector circuit

Circuit open or short circuit
Chain break
Short to ground
Short to +12V

Diagnostic hints

Priority in fault handling:

Process nei first fault DF084 "Actuator relay control circuit", if it is current or saved.

Diagnostic conditions for a stored fault:

The fault is defined as current after the engine is started.

Start the engine and stop it as soon as the fault becomes current to avoid damaging the catalytic converter.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is found, use the procedure below to test the cylinder #1 injector circuit.

Check the connection and condition of the No. 1 injector connector. Repair if necessary.

Measure and compare the injector resistance value with the value given in the More Information section.

Replace the nozzle if necessary.

With the ignition on, check for a voltage of 12 V at pin "1" of the harness block to the injector of cylinder No. 1. If necessary, repair the circuit to the actuator relay.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECM, track "59" - track "2" of injector cylinder no. 1.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

DF041 - No. 2 injector circuit

Circuit open or short circuit
Chain break
Short to ground
Short to +12V

Diagnostic hints

Priority in fault handling:

Deal with fault DF084 Actuator relay control circuit first if it is current or stored.

Diagnostic conditions for a stored fault:

The fault is defined as current after the engine is started.

Start the engine and stop it as soon as the fault becomes current to avoid damaging the catalytic converter.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is found, use the procedure below to test the cylinder #2 injector circuit.

Check the connection and condition of the No. 2 injector connector. Repair if necessary.

Measure and compare the injector resistance value with the value given in the More Information section.

Replace the nozzle if necessary.

With the ignition on, check for a voltage of 12 V on pin "1" of the harness block to the injector of cylinder No. 2. If necessary, repair the malfunction in the circuit up to the actuator relay.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECM, track "90" - track "2" of injector cylinder no. 2.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

DF042 - No. 3 injector circuit

Circuit open or short circuit
Chain break
Short to ground
Short to +12V

Diagnostic hints

Priority in fault handling:

Deal with fault DF084 Actuator relay control circuit first if it is current or stored.

Diagnostic conditions for a stored fault:

The fault is defined as current after the engine is started.

Start the engine and stop it as soon as the fault becomes current to avoid damaging the catalytic converter.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is found, use the procedure below to test the cylinder #3 injector circuit.

Check the connection and condition of the No. 3 injector connector. Repair if necessary.

Measure and compare the resistance value of the injector with the value given by listed in the "More Information" section.

Replace the nozzle if necessary.

With the ignition on, check for the presence of 12 V voltage on terminal "1" of the harness block to the injector of cylinder No. 3.

If necessary, troubleshoot the circuit up to the actuator relay.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECM, track "60" - track "2" of injector cylinder no. 3.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

DF043 - No. 4 injector circuit

Circuit open or short circuit
Chain break
Short to ground
Short to +12V

Diagnostic hints

Priority in fault handling:

Deal with fault DF084 Actuator relay control circuit first if it is current or stored.

Diagnostic conditions for a stored fault:

The fault is defined as current after the engine is started.

Start the engine and stop it as soon as the fault becomes current to avoid damaging the catalytic converter.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is found, use the procedure below to test the cylinder #4 injector circuit.

Check the connection and the condition of the No. 4 injector connector. Repair if necessary.

Measure and compare the injector resistance value with the value given in the More Information section.

Replace the nozzle if necessary.

With the ignition on, check for a voltage of 12 V on pin "1" of the harness block to the injector of cylinder No. 4. If necessary, repair the fault in the circuit to the actuator relay.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECM, track "89" - track "2" of injector cylinder no. 4.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

DF081 - Canister purge solenoid valve circuit

Circuit open or short circuit
Chain break
Short to ground
Short to +12V

Diagnostic hints

Priority in fault handling:

Deal with fault DF084 Actuator relay control circuit first if it is current or stored.

Diagnostic conditions for a stored fault:

The fault is defined as current after command AC017

"Canister purge solenoid valve".

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is found, use the procedure below to test the canister purge solenoid valve circuit.

Check the connection and condition of the canister purge solenoid valve connector. Troubleshoot if necessary.

Measure and compare the resistance value of the canister purge solenoid valve with the value given in the "More Information" section.

If necessary, replace the canister purge solenoid valve.

With the ignition on, check for the presence of 12 V voltage at terminal "1" of the harness block to the canister purge valve. If necessary, eliminate the malfunction in the circuit up to the relay of the actuating devices.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECM, pin "4" - pin "2" of the canister purge solenoid valve.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

After troubleshooting, perform: diagnostic instructions to confirm repair; handle other faults scanned by a diagnostic tool, and then delete information about malfunctions from the computer memory; perform a compliance check.

DF082 - Upstream oxygen sensor heating circuit

Circuit open or short circuit
Fault in the power supply circuit of the heating element
Chain break
Short to ground
Short to +12V

Diagnostic hints

Priority in fault handling:

Deal with fault DF084 Actuator relay control circuit first if it is current or stored.

Diagnostic conditions for a stored fault

The fault is defined as current after command AC018

"Upstream oxygen sensor heating" or after starting the engine.

Features:

- 3/4/5 in current faults.
- 1/2 for any stored fault.

If a current fault is found, use the procedure below to test the upstream oxygen sensor heating circuit.

Check the connection and condition of the oxygen sensor connector. Troubleshoot if necessary.

Measure and compare the resistance value of the upstream oxygen sensor heating element with the value given in the "More Information" section.

Replace the sensor if necessary.

With the ignition on, check for 12 volts on track 4 of the harness connector to the upstream oxygen sensor. If necessary, eliminate the malfunction in the circuit up to the relay of the actuating devices.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECU, terminal "63" - terminal "3" of the upstream oxygen sensor.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

DF083 - Downstream oxygen sensor heating circuit

Circuit open or short circuit
Fault in the power supply circuit of the heating element
Chain break
Short to ground
Short to +12V

Diagnostic hints

Diagnostic conditions for a stored fault:

Fault is defined as current after command AC019

"Heat up the downstream oxygen sensor" or after a certain amount of time the engine has been running under load (road test).

Features:

- 3/4/5 in current faults.
- 1/2 for any stored fault.

If a current fault is found, use the procedure below to test the downstream oxygen sensor heating circuit.

Check the connection and condition of the oxygen sensor connector. Troubleshoot if necessary.

Measure and compare the resistance value of the downstream oxygen sensor heating element with the value given in the "More Information" section.

Replace the sensor if necessary.

With the ignition on, check for 12 volts on track 4 of the harness connector to the downstream oxygen sensor. If necessary, eliminate the malfunction in the circuit up to the relay of the actuating devices.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECU, terminal "65" - terminal "3" of the downstream oxygen sensor.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

DF084 - Actuator relay control circuit

Circuit open or short circuit
Chain break
Short to ground
Short to +12V

Diagnostic hints

Diagnostic conditions for a stored fault:

The fault is defined as current after the ignition is turned on.

If there are multiple faults, deal with that fault first.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

Check the reliability of the connection of the ignition system harness with the vehicle ground.

Troubleshoot if necessary.

Check the reliability of the connection and the condition of the block to the relay of the actuators. Troubleshoot if necessary.

Check for the presence of 12 V voltage on contact "A1" of the actuator relay.

If necessary, repair the fault in the circuit up to the fuse.

Check the winding of the actuator relay for an open circuit.

Replace the relay if necessary.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECM, contact "39" - contact "A2" of the relay of actuators.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

DF091 - Vehicle speed information

Diagnostic hints

Diagnostic conditions for a stored fault:

The fault is reported as current after a road test.

Perform a road test on a hill at a constant speed.

Perform a road test on a slope without depressing the accelerator pedal.

Features:

If a current fault is found, use the procedure below to test the vehicle speed sensor circuit.

If the injection ECU is not receiving vehicle speed information, check for possible damage to the ignition harness.

Check the connection and condition of the speed sensor connector.

Troubleshoot if necessary.

If the problem persists, disconnect the harness connector from the vehicle speed sensor.

With the ignition on, check the presence of + 12 V voltage on track "2" of the block to the sensor and the presence of "ground" on contact "1" of the block to the sensor.

If there is no + 12 V on pin "2" of the block to the sensor, check the condition of the circuit to the actuator relay.

If necessary, troubleshoot the circuit up to the actuator relay

Using a universal contact board, check for open and short circuits in the circuits:

- actuator relay, contact "A5" - contact "2" of the vehicle speed sensor;

- "ground" - contact "1" of the vehicle speed sensor;
- ECU, terminal "53" - terminal "3" of the vehicle speed sensor.

Troubleshoot if necessary.

If the problem persists, replace the vehicle speed sensor.

DF092 - Upstream oxygen sensor circuit

Open circuit or short circuit

Diagnostic hints

Priority in fault handling:

Firstly, deal with fault DF587 "+5 V sensor supply voltage" if it is current or stored.

Diagnostic conditions for a stored fault

The fault is defined as current after the engine is started.

While idling, check that status ET052 Upstream oxygen sensor heating is ON, wait until status ET300 Air mixture control becomes ON, then wait 5 minutes.

Features:

If a current fault is found, use the procedure below to test the upstream oxygen sensor circuit.

Check the connection and condition of the upstream oxygen sensor connector.

Check for moisture in the connector (possible cause of "failures" during overclocking).

Troubleshoot if necessary.

Check for air leaks in the area between the exhaust manifold and the catalytic converter.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU, terminal "45" - terminal "2" of the upstream oxygen sensor;
- ECU, terminal "80" - terminal "1" of the upstream oxygen sensor.

Troubleshoot if necessary.

If the problem persists, replace the oxygen sensor.

If the fault persists, process other faults and then perform a conformance check.

After troubleshooting, perform: diagnostic instructions to confirm repair; handle other faults and, detected by the diagnostic tool, and then delete information about malfunctions from the computer memory; check compliance

DF093 - Downstream oxygen sensor circuit

Open circuit or short circuit

Diagnostic hints

Priority in fault handling:

Firstly, deal with fault DF587 "+5 V sensor supply voltage" if it is current or stored.

Diagnostic conditions for a stored fault

The fault is defined as current after:

- road test at a constant speed, after turning on the electric fan of the cooling system and activating state ET056 "Fuel composition control with double feedback oxygen content in the exhaust gases" (characteristic "YES");
- road test at a constant speed, after turning on the electric fan of the cooling system and subsequent engine braking (with the gear engaged and the clutch pedal released), and the activation of status ET278 "Throttle position: idle" (characteristic "YES").

Features:

If a current fault is found, use the procedure below to test the downstream oxygen sensor circuit.

Check the connection and condition of the downstream oxygen sensor connector.

Troubleshoot if necessary.

Check for air leaks in the area between the two oxygen sensors.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU, terminal "44" - terminal "2" of the upstream oxygen sensor;
- ECU, terminal "76" - terminal "1" of the upstream oxygen sensor.

Troubleshoot if necessary.

If the problem persists, replace the oxygen sensor.

If the fault persists, process other faults and then perform a conformance check.

DF123 - Misfire mixture leading to an increase in the content of toxic substances in the exhaust gases

Diagnostic hints

Diagnostic conditions for stored and current faults:

The fault is defined as current after the engine is started.

Status ET061 Cylinder Detection #1 Adaptation of uneven rotation must be activated (value YES) in order to detect a misfire in a particular cylinder.

The following states provide information about the nature and location of the fault:

- ET057 "Cylinder 1 mixture misfire";
- ET058 "Cylinder 2 misfire";
- ET059 "Cylinder 3 mixture misfire";
- ET060 Cylinder 4 mixture misfire.

If a misfire is detected in only one cylinder (status ET057 or ET058 or ET059 or ET060 is active), then the malfunction is related to an element that is involved in the combustion process of the mixture of only this cylinder:

- malfunction of the nozzle, or spark plug, or high-voltage wire, or finger-type ignition coil (for the K4M engine). Before replacing the element, you can check it by moving it to another cylinder.

If a misfire is detected in a pair of cylinders No. 1 and No. 4, or No. 2 and No. 3 (states ET057 and ET060, or ET058 and ET059 are respectively active), then the malfunction is related to the element that participates in the process of ignition of the mixture in the corresponding cylinders:

- a malfunction in the high voltage circuit of one of the coils of the four-pin ignition coil or the ignition coil control circuit.

If misfires are detected in all four cylinders (states ET057, ET058, ET059, ET060 are active), then the fault is related to the following:

- malfunction of the fuel pump, fuel filter, inconsistency with the required brand of gasoline, inconsistency in the type of spark plugs.

Check the ignition system. Troubleshoot if necessary.

Check the compression in the engine cylinders. Troubleshoot if necessary.

Check the fastening of the engine crankshaft position and speed sensor, the gap between the sensor and the flywheel ring gear. Troubleshoot if necessary.

If the problem persists, check: fuel filter, fuel supply and pressure, condition of the fuel pump, cleanliness of the fuel tank, condition of the injectors. Troubleshoot the fuel supply system.

After troubleshooting, perform: check other malfunctions detected by the diagnostic tool, and then delete the information about malfunctions from the computer memory; to confirm repair, perform the required programming and misfire diagnostic test "Misfire Detection Diagnostic".

DF124- Misfire mixture leading to catalytic converter failure

Diagnostic hints

Diagnostic conditions for stored and current faults:

The fault is defined as current after the engine is started.

Status ET061 Cylinder Detection #1 Adaptation of uneven rotation must be activated (value YES) in order to detect a misfire in a particular cylinder.

The following states provide information about the nature and location of the fault:

- ET057 "Cylinder 1 mixture misfire";
- ET058 "Cylinder 2 misfire";
- ET059 "Cylinder 3 mixture misfire";
- ET060 Cylinder 4 mixture misfire.

- malfunction of the nozzle, or spark plug, or high-voltage wire, or finger-type ignition coil (for the K4M engine). Before replacing the element, you can check it by moving it to another cylinder.

- a malfunction in the high voltage circuit of one of the coils of the four-pin ignition coil or the ignition coil control circuit.

If misfires are detected in all four cylinders (states ET057, ET058, ET059, ET060 are active), then the fault is related to the following:

- malfunction of the fuel pump, fuel filter, inconsistency with the required brand of gasoline, inconsistency in the type of spark plugs.

Check the ignition system. Troubleshoot if necessary.

Check the compression in the engine cylinders. Troubleshoot if necessary.

Check the fastening of the engine crankshaft position and speed sensor, the gap between the sensor and the flywheel ring gear. Troubleshoot if necessary.

If the problem persists, check: fuel filter, fuel supply and pressure, condition of the fuel pump, cleanliness of the fuel tank, condition of the injectors. Troubleshoot the fuel supply system.

After troubleshooting, perform: process other faults detected by the diagnostic tool, and then delete the fault information from the computer memory; to confirm the repair, perform the necessary programming and misfire diagnostic test according to Misfire Detection Diagnosis.

DF232 - Refrigerant pressure sensor circuit

Diagnostic hints

Features:

On vehicles equipped with a refrigerant pressure sensor (information about the operation of the air conditioning system is sent to the ECM), the ECM recalculates parameter PR125 A/C compressor power consumption based on the refrigerant pressure values.

If parameter PR037 Refrigerant pressure is abnormal, the value of parameter PR125 may be incorrect.

Check the connection and condition of the refrigerant pressure sensor connector.

Troubleshoot if necessary.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU, terminal "18" - terminal "C" of the refrigerant pressure sensor;
- ECM, terminal "82" - terminal "A" of the refrigerant pressure sensor;
- ECM, terminal "83" - terminal "B" of the refrigerant pressure sensor.

Troubleshoot if necessary.

If the problem persists, replace the refrigerant pressure sensor.

DF328- Throttle Position Sensor Circuit

Open circuit or short circuit

Diagnostic hints

Priority in fault handling:

Deal with fault DF587 "+5 V sensor supply voltage" first, if it is current or stored j.

Diagnostic conditions for a stored fault:

The fault is defined as current after:

- turn on the ignition, do not press the accelerator pedal for 10 seconds;
- smoothly depress the accelerator pedal to the stop by moving the throttle position sensor from the "idle" position to the "full load" position, and hold the pedal in this state for 10 seconds.

After the condition is met, the fault should be defined as current, but can be defined as stored again.

Features:

If a current fault is found, use the procedure below to test the throttle position sensor circuit.

Check the connection and condition of the throttle position sensor connector. Troubleshoot if necessary.

Check that the resistance of the throttle position sensor is not zero or infinity (i.e. there is no obvious malfunction).

Compare sensor resistance values

Check that the resistance of the sensor changes smoothly when moving the throttle from the "idle" position to the "full load" position.

Replace the throttle position sensor if necessary.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU, terminal "43" - terminal "C" of the throttle position sensor;
- ECU, terminal "74" - terminal "B" of the throttle position sensor;
- ECM, terminal "75" - terminal "A" of the throttle position sensor.

Troubleshoot if necessary.

If the fault persists, refer to the interpretation of fault DF587 "+5 V sensor supply voltage".

DF330- Knock Sensor Circuit

- 1 Open circuit or short circuit

Diagnostic hints

Diagnostic conditions for a stored fault:

The fault is defined as current after a road test when the engine is warmed up to operating temperature in load conditions.

Features:

If a current fault is found, use the procedure below to test the knock sensor circuit.

Check the connection and condition of the knock sensor connector.

Check the tightening torque of the knock sensor on the cylinder block.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU, pin "19" - knock sensor screen;
- ECU, terminal "20" - terminal "1" of the knock sensor;
- ECU, terminal "79" - terminal "2" of the knock sensor.

If the fault persists, process other faults and then perform a conformance check.

DF336- Engine speed and position sensor circuit

-1 Malfunction of the marker section of the sensor on the flywheel ring gear
- 2 No signal from sensor

Diagnostic hints

Priority in fault handling:

Deal with fault DF353 Absolute pressure sensor circuit first if it is current or stored.

Diagnostic conditions for a stored fault:

The fault is defined as current after the starter is turned on for 10 seconds or the engine is started.

Features:

If a current fault is found, use the procedure below to check the engine speed and position sensor circuit.

Check the connection and condition of the engine speed and position sensor connector. Troubleshoot if necessary.

Check the reliability of the fastening of the position and speed sensor of the engine crankshaft. Troubleshoot if necessary.

Compare the resistance value of the sensor. If necessary, replace the sensor.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU, terminal "24" - terminal "B" of the engine speed and position sensor;
- ECM, terminal "54" - terminal "A" of the engine speed and position sensor.

Regular and the need to fix the problem.

Check the condition of the flywheel ring gear marker area.

If the fault persists, process other faults and then perform a conformance check.

After correcting the fault, check that status ET422 "Misfire diagnosis results included" is "Yes", otherwise, program according to "On-Board Diagnostic Conditions"; process other faults detected by the diagnostic tool, and then delete the fault information from the computer memory; perform a compliance check.

DF352 - Immobilizer Circuit

- 1 Open circuit or short circuit

Diagnostic hints

Diagnostic conditions for a stored fault

A fault is defined as current if it is detected when the ignition is turned on.

Check the connection and condition of ECM connector pin 58.

Troubleshoot if necessary.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECU, terminal "58" - terminal "36" UCH.

Troubleshoot if necessary.

If the problem persists, diagnose the immobilizer system.

DF353 - Absolute Pressure Sensor Circuit

- 1 Open circuit or short circuit
- 2 Change in manifold pressure

Diagnostic hints

Priority in fault handling:

Firstly, deal with fault DF587 "+5 V sensor supply voltage" if it is current or stored.

Diagnostic conditions for a stored fault:

The fault is defined as current after the engine is started and the engine speed exceeds 608 rpm for at least 10 seconds.

Features:

If a current fault is found, use the procedure below to test the MAP sensor circuit.

If the fault is determined to be current only with the engine running, check with the ignition on that parameter PR429 matches the throttle position "idle" and "full load".

Slowly depress the accelerator pedal (from idle position) as far as it will go and make sure that the throttle opening angle increases as the pedal is moved.

If the parameters are not correct, refer to the interpretation of parameter PR429 Throttle position measured.

Check the connection and condition of the absolute pressure sensor connector.

Check the tightness of the sensor mounting on the intake manifold.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU, terminal "15" - terminal "A" of the absolute pressure sensor;
- ECU, terminal "16" - terminal "B" of the absolute pressure sensor;
- ECM, terminal "78" - terminal "C" of the absolute pressure sensor.

Troubleshoot if necessary.

If the fault persists, refer to the interpretation of fault DF587 "+5 V sensor supply voltage".

DF360 - Idle control circuit

- 1 Circuit open or short circuit
- 2 Open circuit
- 3 Short to ground
- 4 Short to +12V

Diagnostic hints

Diagnostic conditions for a stored fault:

The fault is defined as current after the engine is started.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current problem is found, use the procedure below to test the idle control circuit.

Check the connection and condition of the idle speed control connector.

Troubleshoot if necessary.

Measure and compare the resistance value of the idle speed stepper motor with the value given in the "More Information" section.

Replace the idle speed control if necessary.

Using a universal contact board, check the absence of an open and short circuit in the circuit:

- ECM, terminal "12" - terminal "B" of the idle speed control;
- ECU, terminal "41" - terminal "A" of the idle speed control;
- ECU, terminal "42" - terminal "C" of the idle speed control;
- ECU, terminal "72" - terminal "D" of the idle speed control.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

DF361 - No. 1 and No. 4 ignition coil circuit

- 1 Circuit open or short circuit
- 2 Open circuit
- 3 Short to ground
- 4 Short to +12V

Diagnostic hints

Priority in fault handling

Deal with faults DF587 "+5 V sensor supply voltage" and DF514 "Fuel pump relay circuit" first, if they are current or stored.

Diagnostic conditions for a stored fault:

The fault is defined as current after the engine is started.

Start the engine and stop it as soon as the fault becomes current to avoid destroying the catalytic converter, or operate the starter for 10 seconds.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is found, use the procedure below to test the ignition coil circuit of cylinder #1-4.

Check the reliability of the connection and the condition of the connector of the four-pin ignition coil (for the K7M engine), individual ignition coils of cylinder No. 1 and No. 4 (for the K4M engine). Troubleshoot if necessary.

Measure and compare the resistance values of the primary and secondary windings of the four-pin ignition coil (for the K7M engine), individual ignition coils of cylinder No. 1 and No. 4 (for the K4M engine) with the values given at the end of the article "Additional Information". If necessary, replace the ignition coil.

With the ignition on, check for a voltage of 12 V at pin "C" of the harness block to the four-pin ignition coil (for the K7M engine), at pin "1" of the harness block to the individual ignition coil of cylinder No. 1 (for the K4M engine).

If necessary, repair the fault in the circuit up to terminal "B5" of the fuel pump relay, refer to the interpretation of fault DF514 Fuel pump relay circuit.

Using a universal contact board, check for an open and short circuit in the circuit:

- for the K7M engine - ECM, pin "32" - pin "A" of the ignition coil;
- for K4M engine - ECM, terminal "32" - terminal "2" of the ignition coil of cylinder No. 4, and terminal "1" of the ignition coil of cylinder No. 4 - terminal "2" of the ignition coil of cylinder No. 1

Troubleshoot if necessary.

If the problem persists, replace the appropriate ignition coil.

If the fault persists, process other faults and then perform a conformance check.

DF362 - No. 2 and No. 3 ignition coil circuit

- 1 Circuit open or short circuit
- 2 Open circuit
- 3 Short to ground
- 4 Short to +12V

Diagnostic hints

Priority in fault handling

Deal with faults DF587 "+5 V sensor supply voltage" and DF514 "Fuel pump relay circuit" first, if they are current or stored.

Diagnostic conditions for a stored fault:

The fault is defined as current after the engine is started.

Start the engine and stop it as soon as the fault becomes current to avoid destroying the catalytic converter, or operate the starter for 10 seconds.

Features:

- 2/3/4 in current faults.
- 1 for any stored fault.

If a current fault is found, use the procedure below to test the ignition coil circuit of cylinder #2-3.

Check the connection and condition of the four-pin ignition coil connector (for engine for K7M), individual ignition coils of cylinder No. 2 and No. 3 (for the K4M engine). Troubleshoot if necessary.

Measure and compare the resistance values of the primary and secondary windings of the four-pin ignition coil (for the K7M engine), individual ignition coils of cylinders No. 2 and No. 3 (for the K4M engine) with the values given at the end of the article "Additional Information". If necessary, replace the ignition coil.

If necessary, repair the fault in the circuit up to terminal "B5" of the fuel pump relay, refer to the interpretation of fault DF514 Fuel pump relay circuit.

Using a universal contact board, check for an open and short circuit in the circuit:

- for the K7M engine - ECM, contact "1" - contact "B" of the ignition coil;
- for K4M engine - ECM, pin "1" - pin "2" of cylinder ignition coil

No. 3, and contact "1" of the ignition coil of cylinder No. 3 - contact "2" of the ignition coil of cylinder No. 2.

Troubleshoot if necessary.

If the problem persists, replace the appropriate ignition coil.

If the fault persists, process other faults and then perform a conformance check.

DF378 - ABS ECU Communication with Injection ECU

Check the connection and condition of the ABS computer connector.

Check the connection and condition of the ECM connector.

If the problem persists, run diagnostics on the multiplex network.

If the problem persists, diagnose the ABS computer.

After troubleshooting, perform: process other faults detected by the diagnostic tool, and then delete the fault information from the computer memory; perform a compliance check.

DF390- Oxygen Sensor Malfunction

Diagnostic hints

Diagnostic conditions for stored and current faults:

- The fault is defined as current after the engine is started.

Features:

This fault indicates a discrepancy between the upstream oxygen sensor signal and the actual value.

Check the exhaust system for leaks.

Check the connection and condition of the upstream oxygen sensor connector.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU, terminal "45" - terminal "2" of the upstream oxygen sensor;
- ECU, terminal "63" - terminal "3" of the upstream oxygen sensor;
- ECU, terminal "80" - terminal "1" of the upstream oxygen sensor.

Troubleshoot if necessary.

If the problem persists, replace the oxygen sensor.

If the fault persists, process other faults and then perform a conformance check.

DF394 - Catalytic Converter Malfunction

Diagnostic hints

Diagnostic conditions for stored and current faults:

The fault is defined as current after the engine is started.

Features:

This malfunction indicates a mismatch in the signals of the upper and lower oxygen sensors.

Check the exhaust system for leaks.

Troubleshoot if necessary.

Inspect the catalytic converter. The presence of deformations of the case may cause a malfunction.

By visual inspection, make sure that there are no signs of severe overheating. (Cold water on a hot catalytic converter can destroy it.

Check for excessive oil or coolant consumption. Ask the owner if he used additives or other similar products.

These products can lead to clogging of the catalytic converter, which can later lead to its failure.

Check with a scan tool for misfires.

Troubleshoot if necessary fault, see interpretation of fault DF124.

If the fault persists, process other faults and then perform a conformance check.

DF514 - Fuel Pump Relay Circuit

- 1 Fuel Pump Relay Power Circuit Malfunction
- 2 Fuel Pump Relay Control Circuit Malfunction

Diagnostic hints

Priority in fault handling:

Firstly, deal with fault DF587 "+5 V sensor supply voltage" if it is current or stored.

Diagnostic conditions for a stored fault:

The fault is declared current after command AC015 Fuel pump relay is given.

This fault is a priority.

Features:

If a current fault is found, use the procedure below to test the fuel pump relay circuit.

- 1 Fuel pump relay power circuit failure:

Check the reliability of the connection and the condition of the block to the fuel pump relay.

Troubleshoot if necessary.

Check for 12 volts at terminal "B3" of the fuel pump relay. If necessary, troubleshoot the circuit up to the fuse.

Turn on the ignition, run command AC015 Fuel Pump Relay and check for 12 volts at terminal "B5" of the fuel pump relay. If necessary, replace the fuel pump relay.

Using a universal contact board, check for open and short circuits in the circuits:

- fuel pump relay, contact "B5" - contact "C" of the four-pin ignition coil (for the K7M engine);
- fuel pump relay, contact "B5" - contact "1" of individual ignition coils of cylinder No. 1 and No. 2 (for K4M engine);
- fuel pump relay, contact "B5" - fuel pump.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

- 2 Fuel Pump Relay Control Circuit Malfunction:

Check the reliability of the connection and the condition of the block to the fuel pump relay.

Troubleshoot if necessary.

With the ignition on, check for 12 volts at terminal "B1" of the fuel pump relay. If necessary, repair the circuit to the ignition switch.

Check the fuel pump relay winding for an open circuit.

Replace the relay if necessary.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECU, terminal "68" - terminal "B2" of the fuel pump relay.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

DF524 - Actuator relay output voltage

- 1 Circuit open or short circuit

Diagnostic hints

Priority in fault handling:

Deal with fault DF084 Actuator relay control circuit first if it is current or stored.

Diagnostic conditions for stored and current faults:

The fault is defined as current after the ignition is turned on.

Check the condition of the battery and the reliability of the fastening of the ground wire terminals of the ignition harness.

Troubleshoot if necessary.

Check the reliability of the connection and the condition of the block to the relay of the actuators.

Troubleshoot if necessary.

Check for the presence of 12 V voltage on contact "A3" of the actuator relay.

If necessary, repair the fault in the circuit up to the fuse.

With the ignition on, check for the presence of 12 V voltage on contact "A5" of the actuator relay.

If necessary, replace the actuator relay.

Using a universal contact board, check for an open and short circuit in the circuit:

- ECU, contact "66" - contact "A5" of the relay of actuators.

Troubleshoot if necessary.

In turn, check the absence of a short circuit in the circuits of the actuators (injectors, canister purge solenoid valve, etc.).

Troubleshoot if necessary.

DF587- Supply voltage + 5V sensors

- 1 Circuit open or short circuit

Diagnostic hints

Diagnostic conditions for a stored fault:

The fault is declared current after checking parameter PR071 Computer supply voltage (measured value of the battery voltage with the ignition on and the engine stopped is about 12 V):

- if the parameter has a value of about 16 V, then this means a short circuit to ground;
- if the parameter has a value of about 10.7 V, then this means a short circuit to + 12 V in one of the 5 V power circuits.

Check the connection and condition of the throttle position sensor, absolute pressure sensor and refrigerant pressure sensor.

Troubleshoot if necessary.

Using a universal contact board, check for open and short circuits in the circuits:

- ECU, terminal "74" - terminal "B" of the throttle position sensor;
- ECU, terminal "83" - terminal "B" of the refrigerant pressure sensor;
- ECM, terminal "78" - terminal "C" of the absolute pressure sensor.

Troubleshoot if necessary.

If the fault persists, process other faults and then perform a conformance check.

Additional information

Throttle position sensor resistance:

- conductive track = 1200 ohm ± 240 ohm;
- moving contact ≤ 1050 Ohm.

Idle speed control stepper motor resistance:

- at 25 °C = 53 Ohm ± 5.3 Ohm.

Resistance of SAGEM four-pin ignition coil (on K7M engine):

- primary winding = 0.5 ohm ± 0.02 ohm;
- secondary winding = 11000 ohm ± 1650 ohm.

BERU individual ignition coil resistance (on K4M engine):

- primary winding = 0.54 ohm ± 0.03 ohm;
- secondary winding = 10700 ohm ± 1600 ohm.

Injector winding resistance:

- at 20 °C = 14.5 ohm ± 0.7 ohm.

Upstream oxygen sensor heating element resistance:

- at 23 °C = 3 - 15 Ohm.

Resistance of the downstream oxygen sensor heating element:

- at 23 °C = 3 - 15 Ohm.

Engine speed and position sensor resistance:

- at 23 °C = 200 - 270 Ohm.

Canister purge solenoid valve resistance:

- at 23 °C = 26 Ohm ± 4 Ohm.

Temperature, °C	-10	25	50	80	110
Temperature sensor resistance air, Ohm	10000 ±1000	2000 ±120	810 ±48.6	309 ±18.5	135 ±8.1
Temperature sensor resistance Coolant, Ohm	12000 ±1080	2000 ±100	811 ±40.5	282 ±8.5	115 ±2.3

Temperature, °C

-10

110

Temperature sensor resistance

air, Ohm

10000

±1000

2000

±120

810

±48.6

309

±18.5

135

±8.1

Temperature sensor resistance

Coolant, Ohm

12000

±1080

2000

±100

811

±40.5

282

±8.5

115

±2.3

Checking the ignition system:

- check the condition, insulation and integrity of the high-voltage wire harnesses (for a four-pin ignition coil);
- check the condition and tightening torques of the spark plugs, as well as their compliance with the engine;
- check the condition of the connectors of the ignition coils;
- check the condition and resistance value of the ignition coil windings;
- with the ignition on, check the presence of + 12 V supply voltage on the ignition coils;
- if necessary, fix the detected problems.

Checking the fuel supply system:

- fuel pressure in the fuel line at the outlet of the fuel tank with the engine running (EBN on) = 3.5 bar ± 0.2 bar;
- EBN performance is not less than 60 l/h.