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 that the shutter in the throttle unit is not blocked or sticking. Clean as necessary.
Check the function of the integrated return spring in the throttle unit by carefully manually turning the throttle to wide open position and then carefully releasing the throttle. Check that the return spring returns the shutter to its resting position.
If the return spring does not return the shutter, the throttle unit is defective.
Remedy as necessary.
Other information:
- see CHECKING WIRING AND TERMINALS
- For resistance values, see COMPONENT SPECIFICATIONS
- For 5 cylinder turbocharged engines -2004, see SIGNAL DESCRIPTION
- For 5 cylinder turbocharged engines 2005-, see SIGNAL SPECIFICATION .
- For 6 cylinder engines -2004, see SIGNAL SPECIFICATION
- For 6 cylinder engines 2005-, see SIGNAL SPECIFICATION .
- For B5xx4T, see THROTTLE BODY (ELECTRONIC THROTTLE MODULE), REPLACING .
- For B6xx4T, see THROTTLE BODY (ELECTRONIC THROTTLE MODULE), REPLACING .
- For B5xx4T, see THROTTLE BODY (TB), CLEANING .
- For B6xx4x, see THROTTLE BODY (TB), CLEANING .
- Continue
Refer to ADAPTATION OF THE THROTTLE UNIT