CHECK ENGINE lamp (MIL) and SHIFT UPlamp

/ 900 / 1997 / 2. Engine / Trionic OBDII / Fault diagnosis, fault symptoms / CHECK ENGINE lamp (MIL) and SHIFT UPlamp

CHECK ENGINE lamp (MIL) and SHIFT UP lamp

Symptom of fault

The lamps do not light up or are on constantly when not activated by the control module.

Note that the SHIFT UP lamp is tested for 3 seconds when the ignition is switched on.

Conditions

No diagnostic trouble codes.

Diagnostic procedure

1. Check the lamps

Connect an ISAT scan tool.

Ignition switch in ON position.

Select "ACTIVATE".

Select "CHECK ENGINE LAMP" and "SHIFT UP LAMP".

Each of the lamps should flash.

Do the lamps flash?

yes

Functionality is OK.

Check that the bulbs are in working order. Then continue with point 2.

2. Check the wiring

Check the wiring between the Trionic control module and the main instrument display panel. CHECK ENGINE lamp (MIL): Between pin 32 of the Trionic control module and pin 22 of the main instrument display panel. SHIFT UP lamp: Between pin 55 of the Trionic control module and pin 39 of the main instrument display panel.

Is the wiring OK?

yes

Continue fault diagnosis as described in Service Manual 3:5 "Electrical system, main instrument display panel".

Rectify the fault.