Engine Control Module With Anti-Theft Immobilizer

WARNING: This page is about a different car, the 2006 Volkswagen Jetta and 2005 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Locking pliers
Electric cutter V.A.G 1561A
Saw set V.A.G 1561/14
Hot air gun from wiring harness repair kit VAS 1978
Attachment nozzle from wiring harness repair kit VAS 1978

NOTE:

If it is desired to replace Engine Control Module (ECM), connect vehicle diagnosis, testing and information system VAS 5051 and perform the function "Replace Control Module".

Removing

-- Switch off ignition.

-- Remove wiper arms and plenum chamber cover, refer to WINDSHIELD WIPER ARMS .

-- Remove plenum chamber bulkhead, refer to Description and Operation .

NOTE:

Thread of shear bolts is equipped with locking compound. By heating the shear bolts using a hot air gun, inhibition effect of the locking compound is lowered.

CAUTION:

Cover wires, harness connectors and control modules in the close vicinity of Engine Control Module (ECM) to prevent damage from burning.

Perform the adjustments on the hot air gun -4- as shown:

-- Turn potentiometer for temperature adjustment -2- to maximum heat output (600° C).

Fig 1: Identifying Controls For Temperature Adjustment And Air Quantity

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-- Move two stage switch for air quantity -3- to position 3.

WARNING:

By heating the shear bolts, parts of the protective housing are heated intensely. Wear protective gloves to prevent injuries.

-- Guide nozzle of hot air gun on to shear bolts.

-- Switch on heat gun and heat bolt for approximately 20 to 25 seconds.

-- Unscrew shear bolt using pliers on bolt head.

The procedure for the second shear bolt is exactly the same.

NOTE:

If screws cannot be removed, saw into heads of shear bolts so that two parallel surfaces are formed -arrows- and then unscrew them.

Fig 2: Identifying Two Flat Parallel Surfaces

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-- Insert a screwdriver -A- between protective housing and retaining plate -arrow-.

Fig 3: Identifying Screwdriver Inserted Between Protective Housing And Retaining Plate

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-- Pry protective housing upward using screwdriver -A- and pull it off sideways from retaining plate -arrow-.

Fig 4: Identifying Protective Housing Pried Upward And Sideways With Screwdriver

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-- Disengage forward harness connector -1- from Engine Control Module (ECM) and disconnect it.

Fig 5: Identifying Forward Harness Connector To Engine Control Module (ECM)

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-- Pry up locking mechanism -2- slightly.

-- Then slide Engine Control Module (ECM) out of retainer -arrow-.

-- Now disengage rear harness connector from Engine Control Module (ECM) and disconnect it.

Installing

-- Connect rear harness connector to Engine Control Module (ECM) and engage it.

-- Slide Engine Control Module (ECM) on to retaining plate.

-- Press the catch -2- against the engine control module.

Fig 6: Identifying Forward Harness Connector To Engine Control Module (ECM)

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-- Now connect front connector -1- to Engine Control Module (ECM) and engage it.

-- Slide protective housing on to retaining plate.

-- Tighten shear bolts -1- uniformly until bolt heads shear off.

Fig 7: Identifying Shear Bolts

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-- Install plenum chamber bulkhead, refer to Description and Operation .

-- Install wiper arms and plenum chamber cover, refer to WINDSHIELD WIPER ARMS .