Procedures

Points To Observe When Replacing Engine Control Module
- When changing an engine control module (ECM) from one car to another, remember to note any diagnostic trouble codes (DTCs) before removing engine control module from the car.
- The engine control module must not be removed from the car until the main relay has interrupted the supply. This may take up to 150 seconds after the ignition has been switched off (car with immobilizer 245 seconds).
- Always check the control module and connector on the control module box for bent or damaged pins or sockets.





Removing Locking Strip
- As part of the anti-theft system on cars with an immobilizer the control module box in the engine compartment is secured with a locking strip. A security screw is used to install the locking strip.
- Mark up the center of the screw and drill a suitable hole for a screw puller. Insert screw puller and remove the screw.
- Remove the locking strip across the engine control module box cover.
- Clean the engine control module box cover carefully so that no dirt or swarf falls into the box when it is opened.





Removing The Engine Control Module
- Check that supply from main relay has been interrupted. Easiest method is to place fingertips on idle air control (IAC) valve. When the valve stops vibrating, the main relay has cut off supply to the system.
- Open engine control module box cover and remove Motronic 4.4 engine control module (module nearest engine).





Installing New Engine Control Module
- Inspect connector pins and sockets for damage.
- Install new engine control module.
- Switch on ignition.
- Read off any diagnostic trouble codes.
- Erase diagnostic trouble codes and reset adaptive functions.





Installing Locking Strip
- As part of the anti-theft system on cars equipped with an engine immobilizer, the engine control module box in the engine compartment is locked into place with a locking strip. The locking strip is installed with a security screw.

CAUTION: Before reinstalling locking strip, make sure that the car has been repaired and no faults persist.

- Locate the slit underneath the engine control module box with your fingers and hook the locking strip into it.
- Fold over the locking strip and tighten the security screw (P/N 1334099-7) so that its head breaks off.





Erasing Diagnostic Trouble Codes And Resetting Adaptive Functions
- It is important both that diagnostic trouble codes are erased and adaptive functions are reset when the engine control module is replaced or when remedying diagnostic trouble codes EFI-231, EFI-232 and EFI-233. If this is not done the car may run poorly despite an absence of faults. This can be carried out in two ways:

^ Diagnostic trouble codes are erased and adaption reset separately.
^ Erase diagnostic trouble codes.
^ Reset adaptive functions.

NOTE: If using the engine control module from another car, diagnostic trouble codes (if any) must be erased and adaptive functions reset as described above before engine control module is reinstalled in car.