Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Control Module
The multi-pin harness connectors of Engine Control Module (ECM) are equipped with a protective housing secured by a locking mechanism and shear bolts -arrows-. Also to impede removing of the shear bolts, their threads are coated with locking compound.
The protective housing must be removed so that multi-pin harness connectors can be disconnected from Engine Control Module (ECM), e.g. to connect the test box or to replace the ECM.
Special tools and workshop equipment required
- Hot air gun (from wiring harness repair kit VAS 1978)
- Attachment nozzle (from wiring harness repair kit VAS 1978)
- Locking pliers (commercially available)
Removing
-- Turn ignition and remove ignition key.
-- Pry off caps on wiper arms using a screwdriver.
-- Loosen nuts -arrows- by several turns.
-- Loosen wiper arms by gently rocking wiper arm. Remove nuts and remove wiper arms.
-- Unclip spray nozzles -arrow-.
-- Push spray nozzle with lines still attached back through opening and into plenum chamber.
-- Remove rubber seal -1- for plenum chamber cover.
-- Remove plenum chamber cover -2-.
To avoid damage (burning) of wire connections and harness connectors, insulation and control modules, the following work steps must be adhered to exactly! Observe operating instructions for heat gun.
-- Adjust settings on hot air gun as depicted in the illustration, this means potentiometer -2- for temperature setting at maximum heat output and two-stage switch -3- for air quantity at position "3".
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.