Checking components and wiring
- Ignition off
- Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation.
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.
NOTE:The resistance of the motor winding in the damper motor is very low.
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.
NOTE:When replacing the throttle unit or the engine control module (ECM) the throttle unit must be adapted. See "Throttle unit adaptation" in the vehicle communication socket.
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, 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 .
Courtesy of VOLVO CARS OF NORTH AMERICA.
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Refer to Verification