Volkswagen Workshop Service and Repair Manuals

Checking throttle valve Special tools and workshop equipment required t  Adapter cable (68-pin) -V.A.G 1598/18A- or adapter -V.A.G 1598/22- t  Hand multimeter -V.A.G 1526C- or multimeter -V.A.G 1715- t  Auxiliary measuring set -V.A.G 1594C- t  Current flow diagram Test procedure –  Switch off ignition. –  Pull connector from throttle valve positioner -V60- → Chapter.

–  Measure resistance between throttle valve positioner -V60- contacts. Specification: 25…45 Ω If the specification is not achieved: –  Renew throttle valve positioner -V60-. If the specification is attained: –  Switch on ignition.

–  Measure throttle valve positioner -V60- supply voltage at connector contact 1 and at engine earth. Specification: approx. battery voltage If the specification is not achieved: –  Switch off ignition. 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 68 Contact 2 + socket 47. 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+sockets 2+28 Contact 2+socket 15. 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.