Conditions

Idle Speed Control. Idling Speed too Low.





Fault symptoms
- CHECK ENGINE.
- Slow idling speed.

On-Board Diagnostics

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

Enable criteria:
- General conditions for this trouble code: Atmospheric pressure must exceed 72 kPa and the engine coolant and intake air temperatures must exceed -7 °C.
- Engine running. Car stationary. Accelerator pedal fully released. Engine load lower than 225 mg/c. Idle speed control requesting greatest possible air mass per combustion.

Fault criteria:
- Engine speed is more than 100 rpm lower than the requested idling speed for 10 s.

Dependents:
- P0501, P0502, P1230, P1530, P1531, P1532 and P1925.

System reaction to a fault:
- None.

OK report:
- Diagnosis performed once and fault criteria not fulfilled.

- Type III.

Diagnostic help
If other codes have been generated, check whether fault diagnosis should start with any of them. Then, check whether the throttle is in limp-home mode.

Functions in the diagnostic tool related to the fault:
- Diagnostic status for the diagnosis.
- Idle speed control, unit ON/OFF.
- Idling speed difference, unit rpm.

Proceed to Diagnostic Procedures Check Additional Diagnostic Trouble Codes In the Trionic System