Engine Control Module, Replacing

Removing

Special tools and workshop equipment required

Heat gun.

NOTE:

When the Motronic Engine Control Module (ECM) -J623- electrical harness connectors are disconnected, the adaptation values are erased and the DTC memory content remains intact.

Work procedure

Check the identification of the previous Motronic Engine Control Module (ECM) -J623- as follows:

-- Connect the scan tool.

-- Switch the ignition on.

-- Using the scan tool, select "Vehicle information".

-- Select " Calibration Identification" in vehicle information.

The electronic control module identification number will be displayed, e.g.: 06A906032NA 4983

-- Record the electronic control module identification number.

-- End diagnosis and switch the ignition off.

Procedure

-- Switch the ignition on.

-- Actuate the touch-wipe function to allow the wipers to move to the end position.

NOTE:

The wiper arms will now move into the line of view on the windshield (service position).

-- Remove the wiper arms caps.

-- Loosen the wiper arm nuts -arrows- several turns.

Fig 1: Identifying Wiper Arm Nuts

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Loosen the wiper arms from the wiper axle by rocking slightly.

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

-- Remove the spray nozzles -arrow-.

Fig 2: Removing Spray Nozzle

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Press the spray nozzles, with the water lines attached, through the plenum chamber opening.

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

Fig 3: Plenum Chamber Cover And Rubber Seal

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

NOTE:

The threads of the shear bolts have been coated with a locking compound and must be heated to be removed.

The Motronic Engine Control Module (ECM) -J623- is secured via a protective housing -1- and shear bolts -2-

Fig 4: Identifying Protective Housing & Shear Bolts

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

CAUTION:

To prevent damage (burning) to the wiring and harness connections, insulation and the electronic control module, perform the following work steps exactly! Observe operating instructions for the heat gun.

WARNING:

The heat gun, shear bolts, and parts of the protective housing will become extremely hot. Use extreme caution when working with or handling these parts to avoid personal injury.

-- Using a Heat gun set at its lowest setting, heat the shear bolt for approx. 20 to 25 Seconds.

-- Remove the shear bolt with locking pliers. Discard the used shear bolts.

Repeat the previous steps for the second shear bolt.

-- Remove the protective housing from the Motronic Engine Control Module (ECM) -J623-.

-- Remove the front electrical harness connector -1- from the Motronic Engine Control Module (ECM) -J623-.

-- Remove the Motronic Engine Control Module (ECM) -J623- from the retainer -arrow-.

Fig 5: Engine Control Module Bracket: Version 2

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Remove the rear electrical harness connector from the Motronic Engine Control Module (ECM) -J623-.

Motronic Engine Control Module (ECM) -J623- installation

Installation is performed in reverse order of removal. Note the following:

The Motronic Engine Control Module (ECM) -J623- must be installed with the protective housing.

Use New shear bolts when installing the Motronic Engine Control Module (ECM) -J623-.

Motronic Engine Control Module (ECM) -J623- reprogramming

-- The new Engine Control Module (ECM) -J623- and immobilizer must be activated.

Final procedures

After repair work, the following work steps must be performed in the mentioned sequence:

Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .