S4 V8-4.2L (BHF) (2004)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine Coolant Temperature (ECT) Sensor -G62-, Checking
Recommended special tools and equipment
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V.A.G 1526A multimeter
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V.A.G 1594A connector test kit
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V.A.G 1598/31 test box
Test requirements:
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Fuses for engine electronics OK
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Engine cold
Checking function
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Connect diagnostic tester. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/Scan Tool Connecting/Diagnostic Tester, Connecting
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Switch ignition on.
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In diagnostic function "33 - OBD", select "Mode 1: Checking measured values."
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Select the desired measuring value "PID 05: Coolant temperature".
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Specified value: approx. ambient temperature
NOTE: If a temperature is indicated which differs greatly from ambient temperature of sensor, check sensor and sensor wires for contact
resistances and open circuit.
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Start engine and let run at idle.
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Specified value: Temperature value must rise evenly
NOTE: The temperature increases in increments of 1.0 degrees C.
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If the engine shows problems in certain temperature ranges and if the temperature does not climb uniformly, the temperature signal is intermittent
and the sensor should be replaced.