Replacing Engine Control Module

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.
- Always check the engine control module and cable harness connectors for bent or damaged pins and sockets which may be the cause of faults.
- Remove soundproofing panel and lower A-pillar panel.





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

- 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.
- Clean swarf from cover.





Removing
- Remove the control module from the bracket. Pull engine control module straight down.
- Disconnect engine control module connector.





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





Installing Locking Strip

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

- Fold over the locking strip as illustrated and tighten the security screw (P/N 1334099-7) so that its head breaks off.





Erasing DTCs 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. 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.