Volkswagen Workshop Service and Repair Manuals

Checking modulating piston movement sender -G149- –  Press → button. –  Press buttons 0 and 6 for function “End data transfer” and confirm entry with Q button. –  Switch off ignition. Engine code AGD (with 68-pin control unit)

–  Disconnect connector for fuel temperature sender -G81- (connector to injection pump quantity adjuster). –  Measure resistance between connector contacts 1 + 2 and 2 + 3. Specification: 5…7 Ω Engine codes AGD (with 80-pin control unit), AHG, AKU

–  Disconnect 10-pin connector for fuel temperature sender -G81- (connector to injection pump quantity adjuster). –  Measure resistance between connector contacts 1 + 2 and 2 + 3. Specification: 5…7 Ω Continuation for all engine codes If the specification is not achieved: –  Renew injection pump → Chapter. If the specification is attained: Engine code AGD (with 68-pin control unit)

–  Connect adapter cable, 68-pin -V.A.G 1598/18A- to control unit wiring harness.

–  Check lines between adapter cable (68-pin) -V.A.G 1598/18A- and connector for open circuit according to current flow diagram. Contact 1 + socket 29 Contact 2 + socket 7 Contact 3 + socket 52. Cable resistance: max. 1.5 Ω. Engine codes AGD (with 80-pin control unit), AHG, AKU

–  Connect adapter -V.A.G 1598/22- to control unit wiring harness.

–  Check lines between adapter -V.A.G 1598/22- and connector for open circuit according to current flow diagram. Contact 1 + socket 56 Contact 2 + socket 57 Contact 3 + socket 64. Cable resistance: max. 1.5 Ω. Continuation for all engine codes –  Also check wiring for short to one another, short to vehicle earth and short to battery positive. Specification: ∞ Ω. If no fault in lines is detected: –  Renew diesel direct injection system control unit -J248- → Chapter.