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 values of the potentiometers in the throttle unit and damper motor winding.
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 (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.
The throttle unit is damaged if the diagnostic trouble code (DTC) recurs.
NOTE:If the throttle unit is replaced it must be adapted. See: "Throttle unit adaptation" in the vehicle communication socket.
Other information:
- See Component specifications
- For information about signals, see ELECTRICAL SYSTEM
- For resistance values: Component specifications
- See Throttle body (electronic throttle module (ETM)), replacing
- See Throttle body, cleaning
- See Contents .
Courtesy of VOLVO CARS OF NORTH AMERICA.
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Refer to Information