Checking The Component

WARNING:

The engine cooling fan (FC) can also operate if the ignition is switched off when this diagnostic trouble code (DTC) is stored.

HINT: To avoid injury, disconnect the power supply to the engine cooling fan (FC) during fault-tracing.

Check the connector on the engine coolant temperature (ECT) sensor. Check for contact resistance and oxidation.
This diagnostic trouble code (DTC) is stored if the engine coolant temperature (ECT) sensor freezes. This may happen if the coolant level is low or there is too little glycol in the coolant. Check the engine coolant level and its freezing point.

HINT: The diagnostic trouble code (DTC) can be caused by a thermostat that doesn't open.

Remedy as necessary.

Other information
- see CONNECTING THE BREAKOUT BOX
- see SIGNAL SPECIFICATION
- see COMPONENT SPECIFICATIONS
- see ENGINE COOLANT TEMPERATURE SENSOR (ECT)
- see CHECKING WIRING AND TERMINALS
Fig 1: Identifying 2-Bit Connector
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Engine Coolant Temperature (ECT) Sensor
Courtesy of VOLVO CARS OF NORTH AMERICA.

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Refer to VERIFICATION