Checking the wiring and component: Notes

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 OF NORTH AMERICA.

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
- See Signal specification
- See Component specifications
- See Temperature sensor engine coolant, replacing
- See Contents
Fig 2: Identifying Engine Coolant Temperature (ECT) Sensor Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

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

Continue
Refer to Verification