P0506

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Slow idling speed.

P0506

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 temperature must exceed -7°C.

-	Engine running. Car stationary. Accelerator pedal fully released. Engine load lower than 150 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 sec.

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.

Fault handling: (See “Fault diagnosis, general” for more information.)

-

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.

Diagnostic tool functions related to this fault are:

•	Diagnostic status for the diagnosis.

•	Idle speed control, ON/OFF.

•	Idling speed difference, unit rpm.

See also the description of test values under ”Fault diagnosis, general” for more information.