Engine Control Module: Service Precautions

Important

Connecting And Disconnecting The Control Module.





The control module must always be isolated when connecting or disconnecting the test box or connectors.

-Switch off the ignition.

-Remove fuse in engine compartment (-90) or number 6(91-).

Switch off the ignition when:

-Connecting and disconnecting test instruments.

-Connecting and disconnecting connectors.

-Connecting and disconnecting electrical leads to the ignition coil and spark plugs.

-Taking readings with an ohmmeter.

When carrying out compression tests:

-Disconnect the 2-pole connector on the ignition coil (to prevent a flash-over to the electrical system wiring harness).

-Remove the connectors from the injectors (to prevent the engine flooding, engine oil being contaminated etc).

Battery




When testing the various components it is important that battery voltage is normal (approx. 12V). If necessary a battery charger can be connected during testing.

Maximum permitted charging current: 15 A at 16V.

-Do not remove the battery leads when the engine is running.

-Remove the battery leads when boost charging.

-Do not use a boost charger or a higher voltage than 16V to aid starting.

Fire Risk




Take great care to avoid sparks, especially when testing the injectors.

High Tension





WARNING: The DI system operates at high power and dangerous voltages in the high tension circuit.

Control Modules




-The control module should not be heated above 80°C (176°F). Remove control modules when storing for example.

-Disconnect the control module connectors when arc welding.

-The control module should be removed if arc welding is to be carried out near it.

-Do not replace the control module without checking electrical leads and components. A fault could otherwise damage the new control module in the same way as the original.

Cleanliness

-Pay attention to cleanliness when working on the fuel system.

-Clean fuel connections carefully before dismantling them.

Gaskets, Seals




-Always use new gaskets and seals when a connection has been dismantled.


BB. Cars with SRS (Supplemental Restraint System) Airbag

WARNING:

Cars fitted with SRS must be treated with extra care when they are being repaired. This is to avoid:

1. Personal injury when repairs are being carried out.

2. Damage to or faults occurring in the SRS.

3.If in doubt always read the SRS manual.

Is the car fitted with SRS?

Cars with SRS are most easily identified by the letters SRS on the center of the steering wheel.

Dashboard Or Around The Steering Column Covers.

Take care not to pinch, scrape or screw into wiring when working on the sound insulation firewall, knee protection, the ignition switch or the steering column covers.

Driver Seat, Mid-console Or Carpet On The Driver's Side.

The SRS collision sensor is beneath the driver seat. The connector to the sensor must never be disconnected. Never install accessories at the sensor.

Steering And Front Suspension

When working on the steering wheel, steering column or steering gear certain procedures must be carried out. If the steering wheel is turned more than 3 turns in either direction the contact pulley will be damaged!


BC. Symbols

To simplify fault tracing and make the service procedures easier to read pictures are sometimes used instead of text.