Test sequence
- Separate gray 3-pin connector -arrow- to engine speed sensor.
- Measure resistance between connector terminals 1 + 2.
- Specification: 1.0 to1.5 k
If the specification is not obtained:
- Replace engine speed sensor -G28-, see item 15.
- Check DTC memory and, if necessary, repair any malfunctions and then erase DTC memory, see DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING .
- Read readiness code, see READINESS CODE, DISPLAYING
.
If the DTC memory has been erased or the engine control module was disconnected from permanent battery positive (B+), the readiness code must be generated again; see READINESS CODE, SETTING .
If the specification is obtained:
- Remove wiper arms and plenum cover:
- Connect test box VAG 1598/22 (through my 1999) or VAG 1598/31 (from my 2000) to control module wiring harness.
- Check wiring between test box and 3 pin connector for open circuit according to wiring diagram.
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
ENGINE SPEED SENSOR HARNESS CONNECTOR TERMINAL SPECIFICATIONSTest box socket no. Terminal Through MY 1999 From MY 2000 1 69 102 2 67 110 3 71 86 - Wire resistance: max. 1.5 Ω
- Check wires at 3 pin connector for short circuit to one another according to wiring diagram.
- Specification: INFINITY Ω
Fig 3: Connecting Test Box Vag 1598/22 (Through My 1999) Or Vag 1598/31 (From My 2000) To Control Module Wiring Harness
If no wiring malfunction is detected:
- Remove sensor and check sensor wheel for secure fit, damage and run -out.
If no malfunction is detected:
- Replace engine control module, see DIESEL DIRECT FUEL INJECTION (DFI) ENGINE CONTROL MODULE (ECM) -J248-, REPLACING .