Volkswagen Workshop Service and Repair Manuals

Checking commencement of injection valve -N108- Engine code AGD (with 68-pin control unit) –  Disconnect connector from injection pump → Chapter.

–  Measure resistance between connector contacts 2+3. Specification: 12…20 Ω Engine codes AGD (with 80-pin control unit), AHG, AKU –  Disconnect 10-pin connector ⇒ Installation location overview, page → Chapter.

–  Measure resistance between connector contacts 9+10. Specification: 12…20 Ω Continuation for all engine codes If the specification is not achieved: –  Renew commencement of injection valve -N108- → Item 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 3-pin connector for open circuit according to current flow diagram. Contact 2+socket 51 Contact 3+socket 68. 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 10-pin connector for open circuit according to current flow diagram. Contact 9+socket 79 Contact 10+sockets 2+28. 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.