The fault code is indicated by a series of long (0.6 s) and short (0.3 s) flashes of a control lamp and a red indicator on the body of the control unit, separated by an interval of 0.9 s. "Long" flashes indicate the first digit of the code, and "short" - the second. After 2.1 s, a series of flashes of the next fault code stored in memory will follow.
Diagnostics
1. Before drawing a conclusion about a malfunction of the injection system, check the cleanliness of the filter, the ignition setting, the gaps in the candles and valves, the compression in the cylinders, make sure that the connectors are securely fastened and that there is no corrosion on them.
2. If no faults are found, then switch the control unit to self-diagnosis mode 2. The fault code is determined by the flashing of the red LED indicator on the right side of the control unit.
3. The registered failure codes are stored in the memory of the control unit until the 50th starter is turned on.
4. If during this period the failure is no longer registered, then it is erased. The code can also be cleared by switching the unit to mode 2 and then to mode 1, or by disconnecting the battery for more than 24 hours.
Setting the self-diagnosis mode
1. Remove the cover of the fuse box containing the control unit connector.
2. Turn on the ignition, thereby the control unit is transferred to mode 1.
3. Connect the IGN and CHK terminals of the diagnostic connector with a jumper. After 2 seconds, the control unit switches to mode 2.
4. In mode 2, only fault codes stored in the memory of the control unit are read.
Attention! If codes 11 and 21 are found, check the crankshaft sensor circuit before checking the ignition circuit.
5. If, on vehicles with a converter, the control unit is set to mode 2, then during engine start-up, the mixture control mode by the composition of the exhaust gases is automatically switched on.
6. If the indicators light up, then the mixture is poor, the extinction of both indicators indicates the enrichment of the mixture.
7. To check the exhaust gas sensor, start the engine, bring the speed to 2000 rpm and observe any indicator for 2 minutes. With a normal sensor, the indicators will flash at least 5 times in 10 seconds.
8. At the end, exit mode 2, for which again for 2 s, connect the IGN and CHK terminals with the engine stopped, or turn off the ignition and disconnect the battery from the ground (on a running engine).
9. For a complete check of the injection system, take the car to a car service.
Code number | Faulty circuit |
11 | crank angle sensor circuit |
12 | flow meter circuit |
13 | fluid temperature sensor circuit |
21 | ignition signal circuit |
34 | knock sensor circuit |
43 | throttle angle sensor circuit |
55 | normal operation of all circuits |