Engine Control Module 2

Engine Control Module 2

Special tools, testers and auxiliary items required

• Hot Air Gun (VAS 1978/14A) with the Shrink Tip for Hot Air Gun (VAS 1978/15A) from the Wiring Harness Repair Kit (VAS 1978B)

• Small Commercially Available Locking Pliers (vise grips)

• The Engine Control Module (ECM) - 1 - is bolted to a protective housing - 5 -. The threads on the shear bolts - 4 - for the metal retainer - 2 - are coated with locking compound so they are more difficult to remove.





• The metal retainer must be removed in order to disconnect the connectors from the engine control module, for example to connect the test box or replace the module.

Removing

- If the engine control module is replaced, select guided functions on the vehicle diagnosis, testing and information system (VAS 5051B) and then replace engine control module.

- Turn the ignition and remove the ignition key.

- Install the protective body covers. Refer to => [ Protective Body Covers, Installing ] Procedures.

R8 Coupe

- Remove the left engine compartment trim - 1 -.





- Open the four nuts on the engine control module 2 (J624) retaining clips and tilt the clips to the side.





- Remove the engine control module 2 - 3 -.

R8 Spyder

- Loosen the bolts - arrows - and remove them with the clips.





- Remove the engine control module 2 and cover - 1 -.

Continuation for All Vehicles

The engine control module is secured with a locking mechanism - 2 and 5 - and shear bolts or with a metal retainer to make it harder to access the module connectors.





• The threads of the shear bolts - 4 - (that are not installed in ECM) are coated with locking compound. For this reason, the threads must be heated with the heat gun to remove both bolts.

• The threads of both shear bolts - 3 - (that are installed in ECM) are not coated with locking compound. The threads in the ECM housing must not be heated and do not require to be heated (unintentional heating of the ECM).

- Adjust the settings on the hot air gun - 4 - as illustrated with the temperature control - 2 - at the maximum setting and the two-stage air flow switch - 3 - set to level 3.





CAUTION!
By heating the threads, the retaining tabs, shear bolts and parts of the metal housing become very hot. Do not burn yourself on this! Make sure that only the threads are heated as much as possible, and not any of the surrounding parts. Possibly cover these parts.

Grinding and drilling is not permitted.

- Warm threads on connector side of shear bolts as shown in illustration.

- Switch on heat gun and heat the bolt for approximately 20 to 30 seconds.





- Remove shear bolts with locking pliers (see direction of - arrow -).





- The shear bolts installed in the engine control module do not need to be heated for removal. They can be removed without heat.

- Disconnect metal retainers from the connectors.

- Remove both bolts from the engine control module 2.

- Disengage the connectors from the engine control module 2 and disconnect the connector.

Installing

Installation is in reverse order of removal, note the following:

- After that, the engine control module 2 must be equipped with the metal retainer.

- Clean threaded holes for shear bolts of locking compound residue. Cleaning can be performed with a thread cutter (tap).

- Always use new shear bolts.

- Install the engine compartment trim.

The procedures to follow after connecting the new ECM are described in guided fault finding and guided functions.