Engine Speed Signal, Checking

Engine Speed Signal, Checking

Special tools, testers and auxiliary items required

• Multimeter (V.A.G 1526 A)

• LED voltage tester (VAG1527B)

• Connector test kit (V.A.G 1594 A)

• Test box (VAG1598/31)

• Vehicle diagnostic, testing and information system ( VAS 5051)

• Adapter (VAS 5051/1)

Vehicles with automatic transmission

• The signal is generated by the Engine speed (RPM) sensor (G28) processed in the Engine Control Module (ECM) and directed to various parts of the electronic system (e.g. control module for A/C or ABS / EDS) from terminal 37 of the ECM. Engine speed signal and wire connections are monitored by these systems.

• Checking Engine speed (RPM) sensor (G28). Refer to => [ Engine Speed Sensor, Checking ] Engine Speed Sensor, Checking

- Connect test box (VAG1598/31) to wiring harness for ECM; do not connect ECM. Refer to => [ Electrical Testing, with Test Box VAG 1598/31 ] Electrical Testing, With Test Box VAG 1598/31.

- Check for open circuit and short to positive (B+) or ground (GND) in following wiring connections:





- Repair any open/short circuit as needed.

If no problems with wiring are found:

- Checking CAN bus. Refer to => [ ABS CAN-Bus Data Exchange, Checking ] ABS CAN-Bus Data Exchange, Checking.