Checking The Connector

WARNING:

Before fault-tracing can begin, the engine cooling fan (FC) connector must be disconnected to prevent the engine cooling fan (FC) engaging. A diagnostic trouble code (DTC) for the engine cooling fan (FC) control module may be stored. After fault-tracing the connector must be reconnected.

Fig 1: Identifying Ignition ON

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Fig 2: Connecting Connector

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Ignition off
Check the connector on the engine coolant temperature (ECT) sensor. Check for contact resistance and oxidation
Reinstall the components, reconnect the connectors etc.
Ignition on
Read off the engine coolant temperature (ECT) sensor.
If the temperature is now within its permitted range, the fault was caused by poor contact in the connector.

Other information
- For B5xx4T, see REPLACING THE THERMOSTAT AND/OR ENGINE COOLANT TEMPERATURE SENSOR
- For B6xx4T, see ENGINE COOLANT TEMPERATURE (ECT) SENSOR, REPLACING .
- see CHECKING WIRING AND TERMINALS
Fig 3: Identifying 2-Bit Connector
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Fig 4: Identifying VCT2000 Diagnostic Tool Symbol In VIDA
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Fig 5: Identifying 2-Bit Connector Side View
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Is the temperature within its permitted range?

YES
OKAY: Troubleshooting has been completed.
NO
Refer to CHECKING THE WIRING AND COMPONENT