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.
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.
Check that the shutter in the throttle unit is not blocked or sticking. Clean as necessary.
Remedy as necessary.
Other information:
- See Contents
- To connect the breakout box, see Connecting the breakout box
- For resistance values, see Component specifications
- 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 clean the throttle unit, see Throttle body (TB), cleaning
- To access or replace the engine control module (ECM), see Engine control module (ECM), replacing .
Courtesy of VOLVO CARS OF NORTH AMERICA.
- Continue
Refer to Adaptation of the throttle unit