With Anti-Theft Immobilizer

WARNING: This page is about a different variant/trim than selected.

NOTE:

If the Engine Control Module (ECM) will be replaced, connect the vehicle diagnostic tester and perform the "Replacing Engine Control Module" guided function.

Special tools and workshop equipment required

Hot Air Gun from Wiring Harness Repair Kit VAS 1978
Small Nozzle Attachment from Wiring Harness Repair Kit VAS 1978

Fig 1: Identifying Hot Air Gun And Wiring Harness Repair Kit VAS 1978
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Removing

-- Turn off the ignition.

-- Remove the windshield wiper arms. Refer to Removal and Installation .

-- Remove the plenum chamber cover. Refer to Removal and Installation .

NOTE:

The thread of the shear bolts are 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 the ECM to prevent damage from burning.

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

-- Turn the potentiometer for the temperature adjustment -2- to maximum heat output (600 °C (1112 °F)).

Fig 2: Identifying Controls For Temperature Adjustment And Air Quantity

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Move the 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 the nozzle of the hot air gun onto the shear bolts.

-- Turn on the heat gun and heat the bolt head for approximately 20 to 25 seconds.

-- Remove the shear bolt -2- using pliers on the bolt head.

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

-- Remove the cover -1- downward from the ECM.

Fig 3: Identifying Cover

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Slide the connector latches -1- on the ECM outward and remove both connectors.

Fig 4: Identifying Connector Release Catches

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Remove the ECM.

Installing

-- Install the ECM in the bracket in the plenum chamber.

-- Connect the connector to the ECM and slide the latches -1- inward.

Fig 5: Identifying Connector Release Catches

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Place the cover -1- over the ECM and install new shear bolts -arrows- by hand.

Fig 6: Identifying Bolt Head

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Tighten new shear bolts uniformly until the bolt heads shear off.

-- Install the plenum chamber cover. Refer to Removal and Installation .

-- Install the windshield wiper arms. Refer to Removal and Installation .