Checking The Wiring And Component

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 engine cooling fan (FC) low-speed may be stored. After fault-tracing the connector must be reconnected.

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS CORPORATION

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

Check the signal cable between engine control module (ECM) terminal #A4 (#A4) and engine coolant temperature (ECT) sensor terminal #1. Check for a short-circuit to ground.

If no faults are found and the fault is permanent, replace the engine coolant temperature (ECT) sensor.

Remedy as necessary.

Other information
- see CONNECTING THE BREAKOUT BOX
- For 5 cylinder turbocharged engines -2004, see SIGNAL DESCRIPTION
- For 5 cylinder turbocharged engines 2005-, see SIGNAL SPECIFICATION .
- 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 2: Identifying 2-Bit Connector
Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying 2-Bit Connector Side View
Courtesy of VOLVO CARS CORPORATION

Continue
Refer to VERIFICATION