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Functional check on control light
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‒ Switch on the ignition.
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‒ If no faults relating to the electronic throttle system are stored in the fault memory, the EPC light should come on for about three seconds.
A - Electronic throttle control fault lamp
-K132 does not light up
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‒ Connect the V.A.G 1598/31 test box to wiring harness leading to engine control unit; engine control unit should not be connected .
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‒ Bridge sockets 1 and 48 on test box.
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‒ Switch on the ignition.
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‒ The fault lamp must light up
If the warning lamp does not light up:
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‒ Switch off ignition.
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‒ Remove dash panel insert and check both bulb and voltage supply.
=> Electrical system; Repair group 90; Dash panel insert; Removing and installing dash panel insert
If no fault is found:
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‒ Check for open circuit and short to positive or earth in the following wiring connections:
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Test box
V.A.G 1598/31
Bush
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Dash panel insert
Contact
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48
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=> "Current Flow Diagrams, Electrical Fault Finding and Installation locations" binder
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‒ Rectify any open/short as necessary.
If the wiring is OK:
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‒ Replace engine control unit => Page 24-23.
B - Electronic throttle control fault lamp
-K132 permanently lit
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‒ Interrogate the fault memory of the engine control unit.
If no fault is stored:
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‒ Connect the V.A.G 1598/31 test box to wiring harness leading to engine control unit; engine control unit should not be connected => Page 24-20.
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‒ Check the following wiring for short to earth:
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Test box
V.A.G 1598/31
Bush
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Dash panel insert
Contact
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48
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=> "Current Flow Diagrams, Electrical Fault Finding and Installation locations" binder
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‒ Eliminate short circuit, if necessary
If the wiring is OK:
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‒ Replace engine control unit => Page 24-23.
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