P0506

Test 1:

Test 2-6:

SYMPTOM
P0506-IDLE SPEED LOW PERFORMANCE

WHEN MONITORED
Engine Running. During an idle condition.

SET CONDITION
If the engine RPM does not come within a calibratable low limit of the target idle speed, a failure timer will increment. When the appropriate failure timer reaches its maximum threshold without sign of RPM trending towards control, a soft fail is generated. When a calibratable number of the soft fails is reached, a 1 trip fault is set. When two 1 trip faults occur in a row, the DTC is set and the MIL illuminates.

POSSIBLE CAUSES
- Good trip equal to zero
- PCV system
- IAC motor passages
- Vacuum leaks
- Air induction system
- Throttle body and throttle linkage