Checking the engine coolant temperature (ECT)

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Fault-tracing must begin with the engine cold (+20°C) so that the engine coolant temperature (ECT) sensor can be tested over as wide a temperature range as possible
• Switch off the climate control system
• Start the engine.

  Read off the engine coolant temperature (ECT).

  Check that the engine coolant temperature (ECT) is within its permitted range and corresponds with the engine warming up.

  Fig 2: Identifying VCT2000 Diagnostic Tool

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the temperature within its permitted range? 

• YES 

  Refer to Checking the thermostat 

• NO 

  Refer to Replacing engine coolant temperature (ECT) sensor