Diagnosis Description

The ECM controls the display on the instrument panel of certain information relating to the operation of the engine.

Four functions are involved here: The OBD malfunction indicator [MI (Yellow)] for the EOBD (European On Board Diagnostics), the pre/post heating, the engine coolant temperature and engine malfunction [MI (Red)].

These four functions are represented by four lights given out by the ECM GLOW LAMP

This lamp indicates that the glow control system has been activated.

ENGINE COOLANT TEMPERATURE LIGHT

This light is used as an indicator of engine overheating.

• In the event of overheating, it is up to the driver whether to stop the vehicle or not.

MALFUNCTION INDICATOR

The OBD malfunction indicator [MI (Yellow)] is used to alert the driver to the existence of engine control system malfunctions involving excessive pollution or if the EOBD system is deactivated.

The ECM makes a request for lighting of the MI (Yellow) only where there is a malfunction present at the end of three consecutive cycles.

The 3-second visual check upon powering up (automatic test procedure controlled by the IPDM E/R) is performed by the ECM.

In the event of a confirmed OBD malfunction by lighting of the MI, no flashing of the light must be observed following the lighting test.

DTCs Causing MI to Light

ENGINE WARNING LIGHT

In the event of an engine malfunction, the ECM may request the display of an engine warning light [MI (Red)].

HOW TO ERASE DTC, 1ST TRIP DTC AND 2ND TRIP DTC

With CONSULT-III

NOTE

:
If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10 seconds and then turn it ON (engine stopped) again.

1. Select ???ENGINE??? with CONSULT-III.

2. Select ???SELF-DIAG RESULTS???.

3. Touch ???ERASE???. (DTC in ECM will be erased)

MI OPERATION CHART

Some malfunction must switch on MI to warn driver, that his engine emissions exceed OBD thresholds (Euro 3 x 2.5).

The rule is to switch on MI after 3 consecutive driving cycles (engine start + engine stop + power latch) with a present OBD malfunction.

To switch off the MI (without CONSULT-III), vehicle has to drive 3 consecutive cycles without present OBD malfunction.

Ignition switch OFF → ON transition, MI remains switched on in pre-drive check mode until engine start. If MI does not switch off whereas engine is running, there is at least one present OBD malfunction.

1. Present malfunction 2. Driving cycle counter 3. Warm up cycle counter 4. Memorised malfunction 5. MI state

NOTE

: Driving cycle and warm up cycle are both detected in the same cycle.

Consult-III Function

FUNCTION

*: The following emission-related diagnostic information is cleared when the ECM memory is erased.

• Diagnostic trouble codes

SELF-DIAGNOSTIC MODE

Self Diagnostic Item
Regarding items detected in ???SELF-DIAG RESULTS??? mode, refer to EC-855, "DTC Index".

DATA MONITOR MODE

NOTE

:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.

ACTIVE TEST MODE

WORK SUPPORT MODE

Work Item

*: The necessary operation is different depending on the operation result of ECM data save or write. Always perform the operation according to procedures. Refer to EC-879, "Work Procedure".