Engine Speed (RPM) Signal, Checking

Engine Speed (RPM) Signal, Checking


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. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" Testing and Inspection
- Check wiring from test box socket 37 to instrument cluster according to wiring diagram for an open circuit.