Conditions

Throttle Motor. Full PWM in Open Direction During Cranking.





Fault symptoms
- CHECK ENGINE.
- Incorrect idle speed.
- Cruise control inoperative.

On-Board Diagnostics

Type of diagnosis:
- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.

Enable criteria:
- Crankshaft rotating but engine not yet started. Main relay voltage exceeding 5V.

Fault criteria:
- Throttle motor is receiving 100 % PWM in opening direction.

Dependents:
- None.

System reaction to a fault:
- Throttle control goes into limp-home mode. The limp-home solenoid will be activated 5 times in succession each time the ignition is turned on until the fault has been rectified and the trouble codes cleared.

OK report:





- Accelerator pedal has been depressed at some time and then fully released. 120 s has expired since then without fault criteria being fulfilled.

Fault handling: Fault Handling III, Other Emission-Related Comp. & Function
- CHECK ENGINE goes on immediately and can be turned off only by clearing the trouble codes.

Diagnostic help
A mechanical or electrical fault is preventing the throttle from opening during starter motor cranking. The main relay voltage supplied to the control module is OK.

Diagnostic tool functions related to this fault are:
- Activation of output for throttle motor.

See also the description of activating functions under "Fault diagnosis, general" for more information.
Tech 2 Menu Structure, DTC Menu, Read Value, Activate, Sys Info

Check the wiring
Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuit in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this.

Proceed to Diagnostic Procedures Checking the Mechanical Operation of the Flap