Chart 5
- Unique Idle Concerns: Fast Idle
- Diesels/Runs On
NOTE:
If the vehicle runs normally with the ignition in the OFF position, check for a damaged ignition switch, an IGN START/RUN or ISP-R circuit short to voltage, or a VPWR circuit short to voltage.
| SYSTEM/COMPONENT | REFERENCE ( PINPOINT TESTS unless noted) |
|---|---|
| Base Engine Check for air leaks, including correct sealing of intake manifold and components or vacuum lines attached to intake air (such as the PCV or EGR valve or vacuum lines). |
Visual. REFER to the appropriate Engine System - General Information article and CARRY OUT the Inspection and Verification to continue diagnosis. |
| Verify the engine operates at normal temperature. | Visual. REFER to the appropriate Engine Cooling article or NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX , to diagnose any cooling system concerns that are present. |
| Intake Air System Leaks | GO to PINPOINT TEST HU . |
| Additional Testing | GO to PINPOINT TEST Z . |