TT Quattro Coupe V6-3.2L (BHE) (2005)
Coolant Temperature Sensor/Switch (For Computer): Testing and Inspection
Engine Coolant Temperature Sensor, Checking
CAUTION:
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Cooling system is under pressure.
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Danger of scalding when opening
NOTE: Use only gold-plated terminals when servicing terminals in the electrical harness connector of Engine Coolant Temperature (ECT) Sensor G62.
Special tools, testers and auxiliary items required
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Multimeter.
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jumper wire.
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Wiring diagram.
Test requirements
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The Motronic Engine Control Module (ECM) J220 fuses OK.
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Battery voltage at least 12.5 volts.
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All electrical consumers such as, lights and rear window defroster, switched off.
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Vehicles with automatic transmission, shift selector lever into position "P" or"N".
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK.
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Ignition switched off.
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Engine cold.
Test procedure
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Perform a preliminary check to verify the customers complaint. See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/General Diagnosis
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Start diagnosis
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Connect the scan tool.
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Switch the ignition on.
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Using the scan tool, check the coolant temperature:
Diagnostic text
Specified value
Coolant temperature
Approx. coolant temperature
If the specified value is not obtained:
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Continue test according to the following table:
If the specified value was obtained:
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Start the engine and let it run at idle.
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The temperature value must increase uniformly in increments of 1.0 degree 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.
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Replace the the Engine Coolant Temperature (ECT) Sensor G62.
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Checking internal resistance