When the ignition is switched on, the indicator lamp lights up (for 0.5 s) and goes out if the self-diagnosis system has not detected a malfunction

This checks the serviceability of the signaling lamp itself.

Diagnostics of the ZMZ-406 engine management system

If the diagnostic system determines a malfunction, then, depending on its nature, the lamp may burn (with the ignition on) either constantly or only when the engine is running.

In both the first and second cases, it is necessary to carry out maintenance of the engine control system.

Diagnostics of the ZMZ-406 engine management system

To switch the control unit to the mode for displaying fault codes, turn on the ignition and remove the cover of the diagnostic connector located under the hood.

Use a jumper made of copper wire to connect the terminals "10" and "12" of the connector.

Diagnostics of the ZMZ-406 engine management system

First, the diagnostic system will issue a code (12) three times in a row, indicating the health of the diagnostic circuit, the control circuit and the operability of the diagnostic system.

Fault codes will be displayed next.

Each fault code will be repeated three times

After displaying all fixed fault codes, the information output cycle will repeat. If there are no fault codes in the unit's memory, then only code (12) will appear.

The detected fault code is stored in the unit's memory for approximately two hours.

By the number of activations of the signaling device, we determine the fault codes.

If the battery is disconnected, other setting data generated by the electronic unit to adapt the engine management system to operating conditions will be lost.

Diagnostics of the ZMZ-406 engine management system

After connecting the ground, start the engine and let it idle (without touching the gas pedal) for at least 1 minute in order to adapt the ignition system to the engine.

To adapt the entire control system, you need to warm up the engine to operating temperature and drive the car for about 1 km with partial throttle opening and without sudden acceleration.

To clear the memory, turn off the ignition and remove the "negative" terminal of the battery for 15 seconds.

Connect the ground terminal to the battery in order to avoid damage to the electronic unit only when the ignition is off.

Fault Code

Diagnostic start mode (self-diagnosis performance) 12

Low signal from mass air flow sensor 13

Mass air flow sensor 14 high

Low level signal from the air temperature sensor (short circuit) 17

High level signal from the air temperature sensor (open circuit) 18

Coolant sensor signal low (short circuit) 21

High signal level from the coolant sensor (open circuit, poor contact in the circuit) 22

Throttle position sensor signal low (short circuit) 23

High throttle position sensor signal (open circuit, poor contact in the circuit) 24

Low voltage of the vehicle's on-board network (less than 10 V) 25

High voltage of the car's on-board network (more than 18 V) 26

Low signal level from the corrector (potentiometer) CO 31

High signal level from the corrector (potentiometer) CO 32

Malfunction in knock sensor circuit 41

Faulty control unit 51

Faulty control unit 52

Faulty crankshaft position sensor (timing) 53

54 Camshaft Position Sensor Malfunction

Control unit failure 61

Faulty random access memory (RAM. RAM) control unit 62

Faulty permanent memory (ROM, ROM) of the control unit 63

Fault while reading block 64 non-volatile memory

Fault while writing to non-volatile memory 65

Low speed crankshaftidle shaft 71

High idle speed 72

Maximum displacement of the UOZ* when controlling for detonation in the 1st cylinder 81

Maximum displacement of the PTO* when controlling for detonation in the 2nd cylinder 82

Maximum displacement of the PTO* when controlling for detonation in the 3rd cylinder 83

Maximum displacement of the PTO* when controlling for detonation in the 4th cylinder 84

Malfunction in the ignition circuit of the 1st cylinder 91

Malfunction in the ignition circuit of the 2nd cylinder 92

Malfunction in the ignition circuit of the 3rd cylinder 93

Malfunction in the ignition circuit of the 4th cylinder 94

Failure of the injector of the 1st cylinder (short circuit in the circuit) 131

Faulty injector of the 1st cylinder (open circuit) 132

Failure of the injector of the 1st cylinder (short circuit to the housing) 133

Cylinder 2 injector malfunction (short circuit) 134

Faulty injector of the 2nd cylinder (open circuit) 135

Faulty injector of the 2nd cylinder (short circuit to the housing) 136

3rd cylinder injector malfunction (short circuit) 137

Faulty injector of the 3rd cylinder (open circuit) 138

Faulty injector of the 3rd cylinder (short circuit to the housing) 139

4th cylinder injector malfunction (short circuit) 141

Faulty injector of the 4th cylinder (open circuit) 142

Faulty injector of the 4th cylinder (short circuit to the housing) 143

Malfunction of the winding 1 WFD ** (short circuit in the circuit) 161

Faulty winding 1 WFD ** (break) 162

Malfunction of the winding 1 RDV** (short circuit to the body) 163

Malfunction of the winding 2 RDV" (short circuit in the circuit) 164

Malfunction of the winding 2 RDV** (break) 165

Malfunction of winding 2 RDV** (short circuit to the case) 166

Fuel pump relay circuit malfunction (short circuit) 167

Fuel pump relay circuit failure (open circuit) 168

Fuel pump relay circuit failure (short to ground) 169

Unload relay circuit failure (short circuit)*** 177

Unload relay circuit failure (open)*** 178

Unload relay circuit failure (short to ground)*** 179

Short circuit in warning lamp circuit*** 181

Open signal lamp circuit*** 182

Short to ground in signaling lamp circuit*** 183

  • * IDO - ignition timing.
  • ** RDV - auxiliary air regulator.
  • *** Checked by external diagnostic equipment.