Checking components and wiring

Check the resistance value of the damper motor winding in the throttle unit. Take readings between throttle unit terminals #1 and #4 (component side). Check for an open-circuit. Check for a short-circuit.

Replace the throttle unit if necessary.

Check the cable (+) for the damper motor between engine control module (ECM) terminal #A35 (#A35) and throttle unit terminal #4 (wiring side). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.

Check the cable (-) for the damper motor between engine control module (ECM) terminal #A36 (#A36) and throttle unit terminal #1 (wiring side). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.

Also check the damper motor cables (+) and (-). Check for a short-circuit to each other.

If no faults are found during the checks and the diagnostic trouble code (DTC) recurs, try replacing the throttle unit.

Remedy as necessary.

Other information: 

• See Contents
• For resistance values, see Component specifications
• To connect the breakout box, see Connecting the breakout box
• 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 access or replace the engine control module (ECM), see Engine control module (ECM), replacing .

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