Coolant Temperature Signal, Checking

Coolant Temperature Signal, Checking


NOTE: The Engine Control Module (ECM) receives the coolant temperature signal from the Instrument cluster. When the signal is received, the charge pressure is reduced to prevent the engine from overheating.







- 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 19 to instrument cluster according to wiring diagram for an open circuit.