Conditions

Throttle Binding.





Fault symptoms
- Engine stalls.
- 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:
- Engine running and throttle control is already in limp-home mode due to another DTC.

Fault criteria:
- Air mass per combustion is greater than requested.

Dependents:
- None.

System reaction to a fault:
- Fuel shut-off. Main relay turned off. Throttle control in limp-home mode. Limp-home solenoid will activate 5 times in succession each time the ignition is turned on until the fault is 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 fault is preventing the throttle from closing. P1251 and P1264 have been generated and throttle control is in limp-home mode. The throttle has been open since then, in spite of the driver having released the accelerator.

WARNING:
The car must not be driven until the fault has been rectified.

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.