Checking The Components And Wiring

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.
Check the resistance of the engine coolant temperature (ECT) sensor. Take readings between terminals #1 and #2 on the engine coolant temperature (ECT) sensor.

Check the signal cable between engine control module (ECM) terminal #A67 (#B7) and engine coolant temperature (ECT) sensor terminal #1. Check for an open-circuit. Check for a short-circuit to supply voltage.

HINT: With the ignition on and engine coolant temperature (ECT) sensor connector disconnected the voltage between terminal #1 and ground terminal should be approximately 5 V.

Check the ground lead between engine control module (ECM) terminal #A42 (#A42) and engine coolant temperature (ECT) sensor terminal #2. Check for an open-circuit.

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 VCT2000 Diagnostic Tool Symbol In VIDA
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Engine Coolant Temperature (ECT) Sensor
Courtesy of VOLVO CARS OF NORTH AMERICA.

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Refer to VERIFICATION