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. Diagnostic trouble code (DTC) ECM-6110 Engine cooling fan (FC) low-speed signal 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 between terminals #1 and #2 (component side).

Check the signal cable between control module 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:
- To connect the breakout box / access the control module, see Connecting the breakout box
- To access the engine coolant temperature (ECT) sensor, see Temperature sensor engine coolant, replacing
- For resistance values, see Component specifications
- For information about signals, see Signal specification
- See Contents .
Fig 2: Identifying Engine Coolant Temperature (ECT) Sensor Connector Terminals
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Ohmmeter
Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying Engine Coolant Temperature (ECT) Sensor
Courtesy of VOLVO CARS OF NORTH AMERICA.

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Refer to Verification