Engine Control Module -J623- With Protective Housing, Removing And Installing: Removing

-- If the Engine Control Module -J623- is to be replaced, the adaptation values must be read and saved before removing the Engine Control Module -J623-.

-- Connect the Vehicle Diagnostic Tester.

-- Select Diagnostic  operating mode and Start Diagnostics  .

-- Select the Select Individual Test  tab and select the following tree structure consecutively:

• Drivetrain 
• Select The Engine Code & Engine 
• 01 - OBD-Capable Systems 
• 01 - Engine Electronics 
• 01 - Engine Electronics, Functions 
• 01- Control Module, Replacing 

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

• 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.

-- Turn off the ignition and remove the ignition key.

-- Remove the battery. Refer to BATTERY, REMOVING AND INSTALLING .

Remove the shear bolts -arrows- to remove the protective housing -1- as follows:

Fig 1: Identifying Protective Housing Bolts

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-- Use a mini-grinder -2- to make a slit in the head of the shear bolt -1- for a screwdriver.

Fig 2: Identifying Mini-Grinder

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-- To remove the bolts warm the threads using the hot air gun.

-- 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 3: Identifying Controls For Heat Gun

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-- Warm the head of the shear bolt -1- for approximately 20 to 30 seconds.

Fig 4: Identifying Hot Air Blower

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-- Remove the shear bolt -1- with a screwdriver -2-.

Fig 5: Removing Bolt

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-- Remove the protective housing from the Engine Control Module -J623-.

-- Release the retainers in direction of -arrow A- and remove the Engine Control Module -J623- in direction of -arrow B-.

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-- Unlock and disconnect the connectors from the Engine Control Module -J623-.