S4 Quattro Sedan V6-2.7L Turbo (APB) (2000)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Coolant Temperature Signal, Checking
Coolant Temperature Signal, Checking
NOTE:
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The engine control module 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.
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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/Wiring And Component Check With VAG1598/31 Test Box", See: Powertrain Management/Computers and Control
Systems/Testing and Inspection
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Check wiring from test box socket 19 to instrument cluster according to wiring diagram for an open circuit.