Checking 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: 

• For information about signals for 5 cylinder engines see Signal specification
• For information about signals for 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 .
• For resistance values see Component specifications
• See Throttle body (electronic throttle module (ETM), replacing
• See Throttle body (TB), cleaning
• See Contents

Fig 2: Identifying Throttle Unit Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Throttle Unit Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification