Checking the connectors and components

Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation.

Check the resistance values of the potentiometers in the throttle unit.

Check that the shutter in the throttle unit is not blocked or sticking. Clean as necessary.

Remedy as necessary.

Other information: 

• See Contents
• For resistance values, see Component specifications
• For information about signals on 5 cylinder engines, see Signal specification
• For information about signals on 6 cylinder engines:
  • For 6 cylinder engines -2001, see Signal specification
  • For 6 cylinder engines 2002-, see Signal specification
  • For 6 cylinder engines -2004, see Signal specification
  • For 6 cylinder engines 2005-, see Signal specification .
• To access or replace the throttle unit, see Throttle body (electronic throttle module (ETM)), replacing
• To clean the throttle unit, see Throttle body (TB), cleaning .

Fig 2: Identifying Throttle Unit Connector Terminals (Wiring Side)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 4: Identifying Throttle Unit Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification