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Hints and Tips: Volkswagen

ENGINE DOESN'T START
FAULT
:
Engine doesn't start or stalls briefly after the start - ECU disabled
CAUSE
:
The ECU is intermittently disabled Because of a fault in the immobiliser (transponder).Due to corrosion
on the connectors of the immobiliser control unit there are often loose connections.
SOLUTION
:
If the immobiliser control unit has no fault stored, the cause is a loose contact or an excessive
transition resistance on connectors or earth connection.
· Check the earth cable and earth contact for the immobiliser control unit.
· The cables of the control unit must be routed free of tension.
· With height adjustable steering wheels make sure the cable to the reading coil has enough clearance. Observe
the maximum adjustment range of the steering wheel.
· Attach the loose cable from the reading coil with a cable binder at a suitable point, as near to the control unit
as possible.

In case of persistent complaints replace both control unit and reading coil with tin-plated contacts or with
gold-plated contacts. A mixed installation of tin-plated and gold-plated contacts is causes corrosion.
· The old part number of the control unit is indicated using the V.A.G 1551
· For identification the new control unit has a brown mark or the plug end is brown.


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