Engine Speed Sensor: Description and Operation

NOTE:
- The engine speed signal is taken from terminal 37 on the Engine Control Module (ECM).
- The signal is used for various functions including the RPM display in the instrument cluster.







- Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself.
- Check wiring from test box socket 37 to instrument cluster according to wiring diagram for an open circuit.