Volkswagen Workshop Service and Repair Manuals

Checking charge pressure control solenoid valve -N75- –  Switch off ignition. –  Pull connector off charge pressure control solenoid valve. –  Measure resistance between valve contacts.

Engine code AGR Specification: 25…45 Ω

Engine code AHF, ALH, ASV Specification: 14…20 Ω If the specification is not attained: –  Renew charge pressure control solenoid valve -N75-. If the specification is obtained: –  Switch on ignition.

–  Measure supply voltage between valve connector -contact 1- and engine earth. Specification: approx. battery voltage If the specification is not attained: –  Switch off ignition.

Vehicles with 80-pin control unit –  Connect test box -V.A.G 1598/22- to control unit wiring harness.

–  Check wiring between text box and connector for open circuit using current flow diagram. -Contact 1+socket 2 and 28- and -contact 2+socket 15- wire resistance: max. 1.5 Ω –  Also check wiring for short to one another, short to earth and short to battery positive. Specification: ∞ Ω

Vehicles with 121-pin control unit –  Connect test box -V.A.G 1598/31- to control unit wiring harness.

–  Check wiring between text box and connector for open circuit using current flow diagram. -Contact 1+socket 1 and 2- and -contact 2+socket 62- wire resistance: max. 1.5 Ω –  Also check wiring for short to one another, short to earth and short to battery positive. Specification: ∞ Ω Continuation for all vehicles If no fault in lines is detected: –  Renew diesel direct injection system control unit -J248- → Rep. Gr.23