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 CHECKING WIRING AND TERMINALS
• For resistance values, see COMPONENT SPECIFICATIONS
• To connect the breakout box, see CONNECTING THE BREAKOUT BOX
• For 5 cylinder turbocharged engines -2004, see SIGNAL DESCRIPTION
• For 5 cylinder turbocharged engines 2005-, see SIGNAL SPECIFICATION .
• For 6 cylinder engines -2004, see SIGNAL SPECIFICATION
• For 6 cylinder engines 2005-, see SIGNAL SPECIFICATION .
• For B5xx4T, see THROTTLE BODY (ELECTRONIC THROTTLE MODULE), REPLACING .
• For B6xx4T, see THROTTLE BODY (ELECTRONIC THROTTLE MODULE), REPLACING .
• To access or replace the engine control module (ECM), see ENGINE CONTROL MODULE (ECM), REPLACING .

Fig 2: Identifying Throttle Unit Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Ohm Meter

Courtesy of VOLVO CARS CORPORATION

Fig 4: Identifying Throttle Unit Connector Terminals

Courtesy of VOLVO CARS CORPORATION

Refer to VERIFICATION