Chart 5

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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 (Section 5 Pinpoint Test 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). REFER to the appropriate service information article, Engine System and CARRY OUT the Inspection and Verification to continue diagnosis.
Cooling System	Verify the engine operates at normal temperature. REFER to the appropriate service information article, Engine Cooling 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: INTAKE AIR SYSTEMS .
Additional Testing	GO to PINPOINT TEST Z: INTERMITTENT .