Checking the connector

Fig 1: Identifying Ignition Switch OFF Position

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• Ignition off
• Check the connector on the engine coolant temperature (ECT) sensor. Check for contact resistance and oxidation.

  Remedy as necessary.

  Other information 

  • To access or replace the engine coolant temperature (ECT) sensor, see engine coolant temperature (ECT) sensor, replacing
  • For information about signals see Signal specification
  • See Checking wiring and terminals .
  Fig 2: Identifying Ohmmeter

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• Continue 

  Refer to Checking the connector 

Fig 1: Identifying Ignition Switch ON Position

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Fig 2: Identifying Connector(s) Reinstallation

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• Ignition off
• Reinstall the components, reconnect the connectors etc.
• Ignition on
• Read off the engine coolant temperature (ECT) sensor signal.

  Check that the signal is within its permitted range - compare with the value in the table: engine coolant temperature (ECT) sensor .

  If the temperature reading is now OK, the fault was probably caused by poor contact in the connector.

  Other information 

  • To access or replace the engine coolant temperature (ECT) sensor, see engine coolant temperature (ECT) sensor, replacing
  • For information about signals, see Signal specification .
  Fig 3: Identifying VCT2000 Diagnostic Tool

  Courtesy of VOLVO CARS OF NORTH AMERICA.

Is the temperature reading OK? 

• YES 

  Refer to Verification 

• NO 

  Refer to Checking the wiring and component