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.
Check the power supply cable (5 volts) between engine control module (ECM) terminal #A59 (#A59) and throttle unit terminal #3 (wiring side). Check for an open-circuit. Check for a short-circuit to ground.
HINT: With the ignition on, the power supply to the throttle unit potentiometers must be approximately 5 V measured between throttle unit connector terminals #2 and #3 (wiring side).
Check the signal cable (potentiometer 2) between engine control module (ECM) terminal #A20 (#A20) and throttle unit terminal #5 (wiring side). Check for an open-circuit. Check for a short-circuit to ground.
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, the throttle unit must be adapted.
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:
- For 6 cylinder engines -2001, see Signal specification
- For 6 cylinder engines 2002-, see Signal specification
- For 6 cylinder engines -2004, see Signal specification
- For 6 cylinder engines 2005-, see Signal specification .
- To access or replace the throttle unit, see Throttle body (electronic throttle module (ETM)), replacing .
Courtesy of VOLVO CARS OF NORTH AMERICA.
- Continue
Refer to Verification