Checking components and wiring

Fig 1: Identifying Ignition Switch OFF Position

Courtesy of VOLVO CARS OF NORTH AMERICA.

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 (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 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 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.

Continue
Refer to Adaptation of the throttle unit