Engine Control Module -J623-, REMOVING AND INSTALLING: Removing

Remove the Engine Control Module.

-- Store the injector adaptation values before removing the Engine Control Module -J623-.

The injector adaptation values of the faulty engine control module can be stored as a file using the Vehicle Diagnostic Tester with Guided Fault Finding or Guided Functions.

NOTE:

If the injector adaptation values from the faulty engine control unit are no longer readable, they must be manually entered and adapted in the new engine control module.

-- After to storing the file, switch the ignition off.

-- Remove ignition key.

-- Remove front rubber seal on plenum chamber.

-- Unclip the plenum chamber cover on the right side and lift it up slightly.

-- Grasp under plenum chamber cover and unclip ECM -1- from bracket.

Fig 1: Identifying Engine Control Module (ECM) -J623- -1- And GND Wire Nut -2-

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Ignore item -2-.

Engine Control Module (ECM) remains connected at wiring harness.

The engine control module -1- is secured in a protective housing -5- with retaining tabs -2- and shear bolts -3 and 4- to make it harder to access it.

Fig 2: Identifying Engine Control Module (ECM) Components

Courtesy of AUDI OF AMERICA, LLC

The threads of the shear bolts -4- (that are not screwed into the ECM) are coated with a 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 screwed into the ECM, are not coated with a locking compound. The threads in the ECM housing must not be heated and do not require to be heated (unintentional heating of the ECM).

Fig 3: Identifying Engine Control Module (ECM) Components

Courtesy of AUDI OF AMERICA, LLC

-- Set the adjustment on the heat gun as shown in the illustration, with the temperature potentiometer -2- set to maximum heat and the two-stage airflow switch -3- set to level 3.

Fig 4: Identifying Controls For Heat Gun

Courtesy of AUDI OF AMERICA, LLC

WARNING:

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.

-- Warm threads on connector-side shear bolts for approximately 25 to 30 seconds.

Fig 5: Directing Heat Gun Nozzle

Courtesy of AUDI OF AMERICA, LLC

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

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

Fig 6: Identifying Locking Pliers And Shear Bolt

Courtesy of AUDI OF AMERICA, LLC

-- Separate the protective housing from the control module connectors.

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

-- Remove old Engine Control Module -J623- and install the Engine Control Module -J623-.