Table of contents: Malfunction indicator ↓ Switching diagnostic modes ↓ Diagnostic mode I - Malfunction…↓ Diagnostic mode II - output of…↓ Clearing fault codes ↓
Malfunction indicator
The Malfunction Indicator Lamp (MIL) comes on when the ignition is turned on to check the lamp. It should go out after the engine starts.
If the indicator does not light after turning on the ignition, you must first check the lamp and contacts in the indicator circuit.
If the MIL does not go out after starting the engine or flashes irregularly, it may be caused by water accumulation in the fuel filter, drain the water from the filter.
Switching diagnostic modes
Diagnostic mode I: is set immediately after the ignition is turned on (checking the Malfunction Indicator Lamp). After starting the engine, the indicator will issue a warning about detected faults.
Diagnostic mode II: When the engine is not running and the ignition is on, the self-diagnostic results are displayed on the indicator. After the engine is started, the MIL does not function.
Switching from mode I to mode II back is only possible with the engine off and the ignition on. To do this, it is necessary to close the contacts of the diagnostic connector SNK and IGN with a suitable conductor for at least 2 seconds.
If the ignition is turned off in diagnostic mode II, power will be removed from the ECM after approximately 5 seconds.
After turning on the ignition, the I mode will be automatically set.
Diagnostic mode I - Malfunction warning
If a malfunction is detected in the circuits covered by self-diagnosis during engine operation, the malfunction indicator lamp illuminates and the malfunction code is stored in the ECM memory. If the malfunction is not confirmed at the next engine start, the indicator lamp will not illuminate, but the code will remain in memory. If the malfunction occurs three times in a row, the MIL will remain on even if there is no malfunction. To turn it off, the malfunction must be absent during three consecutive engine starts. The malfunction code can be recalled in diagnostic mode II within 40 engine starts after the malfunction has no longer occurred.
Diagnostic mode II - output of self-diagnostic results
In this mode, fault codes are issued, for which the fault indicator flashes. Long flashes (0.6 s) indicate tens, short ones (0.3 s) indicate units (see picture).
The issuance of code 55 indicates that there are no faults.
In this mode it is impossible to determine whether the fault exists at the moment or whether it occurred in the past. For such diagnostics, the proprietary CONSULT device is required, which is connected via the diagnostic connector.
Clearing fault codes
The fault codes are erased from the memory when switching from diagnostic mode II to mode I. When the battery is disconnected, the codes are stored in the memory for about 24 hours.