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.

Check the cable (+) for the damper motor between engine control module (ECM) terminal #A35 (#A35) and throttle unit terminal #4 (cable harness 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 (cable harness 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.

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

Remedy as necessary.

Other information: 

• See Connecting the breakout box
• For information about signals for 5 cylinder engines: Signal specification
• For information about signals for 6 cylinder engines: Signal specification
• For resistance values: Component specifications
• See Throttle body (electronic throttle module (ETM)), replacing
• See Throttle body (TB), cleaning
• See Engine control module (ECM), replacing
• See Contents .

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

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 3: Identifying Throttle Unit Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Adaptation of the throttle unit