Checking Modulating Piston Displacement Sensor G149.

WARNING: This page is about a different variant/trim than selected.

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.

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:

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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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 .