Engine Control Module (ECM) -J623

Special tools and workshop equipment required 

• Heat Air Blower VAS 1978/14A with nozzle attachment from the Wiring Harness Repair Set VAS 1978 B
• Puller T10369
• Small commercially available locking pliers

Removing 

-- Read the adaptation values for the fuel injector and ash content before removing the Engine Control Module (ECM) -J623-. Use a vehicle diagnosis tester.

-- Save the adaptation values as a file.

-- Switch off the ignition after saving the file and remove the key.

NOTE:

Some ECMs are not equipped with a protective housing. The removal and installation of the protective housing depends on the engine and transmission combination.

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

The ECM -1- is bolted to a protective housing -5-. To make removing the shear bolts -4- for the retaining tabs -2- more difficult, the threads are coated with locking compound.

Fig 1: Identifying Engine Control Module (ECM), Protective Housing, Retaining Tabs & Shear Bolts

Courtesy of AUDI OF AMERICA, LLC

To disconnect the connectors from the ECM (for example to connect the test box or to replace the ECM), the protective housing must be removed.

-- Turn the ignition and remove the ignition key.

-- Pry off the caps on the windshield wiper arms using a screwdriver.

-- Loosen the nuts -arrows- by several turns.

Fig 2: Wiper Arm Nuts

Courtesy of AUDI OF AMERICA, LLC

-- Loosen wiper arms by tilting slightly from windshield wiper axle.

-- Remove the nuts and remove the windshield wiper arms from the wiper axles.

NOTE:

If it is not possible to remove the windshield wiper arms this way, use the T10369 or a commercially available puller.

Fig 3: Removing Windshield Wiper Arm With Puller T10369/1

Courtesy of AUDI OF AMERICA, LLC

-- Remove rubber seal -1- and remove plenum chamber cover -2-.

Fig 4: Rubber Seal & Plenum Chamber Cover

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-- Open the clamp -arrow- and remove the ECM.

Fig 5: Engine Control Module Bracket: Version 1

Courtesy of AUDI OF AMERICA, LLC