Checking Modulating Piston Displacement Sensor G149.

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2006 Volkswagen Golf, 2005 Volkswagen Jetta, 2005 Volkswagen Golf, 2004 Volkswagen Jetta, and 2004 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.

Press the → button.
Press buttons 0 and 6 for the function "End output" and confirm entry with the Q button.
Switch ignition off.

Fig 1: Identifying Fuel Cut-off Valve Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect the 10-pin connector for the metering unit (connector to metering unit in injection pump) - arrow -.

Fig 2: 10-Pin Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Measure resistance between connector terminals 1 + 2 and 2 + 3.

Specification: 4.9 to 7.5 Ω

If specification is not obtained:

Replace injection pump → Injection pump, removing and installing .
Check DTC memory and, if necessary, repair any malfunctions and then erase → Diagnostic Trouble Code (DTC) memory, checking and erasing .
Read-out the readiness code → Reading readiness code . If the DTC memory has been erased, the readiness code must be generated again → Readiness code, setting .

If specification is obtained:

Remove wiper arms and plenum cover: → 92 WINDSHIELD WIPER & WASHER SYSTEM

Fig 3: Identifying Test Box V.A.G 1598/31 Connected To Control Module Wiring Harness

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect test box VAG1598/31 to control module wiring harness.

Fig 4: 10-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check wiring between test box and connector for open circuit according to wiring diagram.

Terminal 1+ socket 108

Terminal 2+ socket 106

Terminal 3+ socket 99

Wire resistance: max. 1.5 Ω

Check wires for short to one another, to vehicle Ground and to battery positive (B+).

Specification: ∞Ω

If no fault is detected in the wiring:

Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 → Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing .