Checking components and wiring

Check the resistance of the engine coolant temperature sensor.

Remedy as necessary.

Other information: 

• See Signal specification
• See Components resistance values
• To access or replace the engine coolant temperature sensor. For cars manufactured up to w38 2001 inclusive, see Overheat protection thermostat / flame sensor / engine coolant temperature sensor, replacing
• For cars manufactured from w39 2001 inclusive, see Replacing the overheat protection thermostat, the flame sensor and the engine coolant temperature sensor .

Fig 1: Identifying Engine Coolant Temperature Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  Refer to Verification 

Check the fuel pump (FP) and combustion preheater module (CPM) connectors. Check for contact resistance and oxidation.

Check the cable between combustion preheater module (CPM) terminal #13 and fuel pump terminal 1. Check for an intermittent open-circuit.

Check the cable between combustion preheater module (CPM) terminal #11 and fuel pump terminal 2. Check for an intermittent open-circuit.

Remedy as necessary.

Other information: 

• See Connecting the breakout box
• For cars manufactured up to w38 2001 inclusive, see Fuel pump, auxiliary heater, replacing For cars manufactured from w39 2001 inclusive, see Fuel pump auxiliary heater, replacing
• To access or replace the engine coolant temperature sensor. For cars manufactured up to w38 2001 inclusive, see Overheat protection thermostat / flame sensor / engine coolant temperature sensor, replacing
• For cars manufactured from w39 2001 inclusive, see Replacing the overheat protection thermostat, the flame sensor and the engine coolant temperature sensor .
• See Contents

Fig 1: Identifying Fuel Pump Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Continue 

  Refer to Verification