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.

Symptom Chart

System/Component	Reference ( Pinpoint Tests - Gasoline Models Unless Noted)
Base Engine Check For Air Leaks, Including Correct Sealing Of Intake Manifold And Components/Vacuum Lines Attached To Intake Air (Such As The PCV, EGR Or IAC Valve/Vacuum Lines).	Visual. Refer To The Appropriate Engine System 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.
Fast Idle Concerns (Ranger) With The Ignition On, Engine Off Monitor The TP Mode PID While Wiggling The TP Sensor Circuits. The TP Mode PID Can Also Be Monitored During Vehicle Drive. With The Throttle Closed, The TP Mode PID Must Be C/T (Closed Throttle).	TP Mode PID Is Not C/T With The Throttle Closed: At Vehicle Start, The TPREL Begins At About 1.25 Volts And Counts Down To The Lowest TP Voltage Value Seen Since Engine Start. If The TP Voltage Value Goes Below The Normal Range, Then Increases Again, TPREL Sets To The Lower Voltage. If The TP Voltage Is About 0.04 Volt Greater Than The TPREL Value At Closed Throttle, The PCM Goes Into Part Throttle Mode. Monitor The TP Voltage And TPREL PIDs For Sudden Changes While Checking For Intermittent TP Circuit/Connector Concerns. Check For Loose Or Worn Throttle Plates. If No Concern Is Found, Go To Pinpoint Test Z .
Intake Air System Leaks	Go To Pinpoint Test HU .
Additional Testing	Go To Pinpoint Test Z .