Checking wiring and connectors

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS OF NORTH AMERICA.

Ignition off.
Check the engine coolant temperature (ECT) sensor connector for contact resistance and oxidation according to Contact resistance and oxidation .

Check the engine coolant temperature (ECT) sensor and engine control module (ECM) terminals visually according to Check terminals visually .

Remedy as necessary.

Try a new engine coolant temperature (ECT) sensor if no fault is found during the above fault-tracing.

Other information:
- To connect the breakout box, see Connecting the breakout box. EMS 2000
- For information about signals, see Signal specification
- To replace the engine coolant temperature (ECT) sensor, see Replacing the engine coolant temperature (ECT) sensor .
Fig 2: Identifying Terminal Connectors
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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