P0505

P0505-ENGINE SPEED AT IDLE - DATA ERRATIC, INTERMITTENT OR INCORRECT

For a complete wiring diagram Refer to Diagrams/Electrical.

Theory of Operation


This algorithm checks if the governor control system is unable to maintain idle speed. If idle speed is off by more than 50 RPM for a calibrated amount of time (15 seconds), the diagnostic sets a fault.

- When Monitored:
While engine is idling.

- Set Condition:
Idle speed error detected.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview


Diagnostic Test


1. OTHER DTC'S
Ignition on, engine not running.
With the scan tool, read DTC's.
Are any other DTC'S present?

Yes


- Repair all other DTC's First.


No


- Go To 2



2. P0505 ACTIVE
With the scan tool, read DTC's.
Is P0505 Active?

Yes


- Repair the erratic idle condition.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test


No


- Repair complete.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test