No. 9 Fast Idle/Runs On

9	FAST IDLE/RUNS ON
DESCRIPTION	The engine speed continues at fast idle after warm-up. The engine runs after the ignition switch is turned off.
POSSIBLE CAUSE	ECT sensor malfunction Air leakage from intake-air system Throttle body malfunction APP sensor malfunction Cruise control system operation improperly Improper load signal input Improper operation of electronic throttle control system

DIAGNOSTIC PROCEDURE

STEP	INSPECTION	RESULTS	ACTION
1	Access the ECT PID. Start and warm up the engine to normal operating temperature. Is the ECT PID between 82-112°C {180-234°F}?	Yes	Go to the next step.
1		No	ECT PID is higher than 112°C {234°F} Go to the symptom troubleshooting "No. 17 Cooling system concerns - Overheating". (See NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING ). ECT PID is less than 82°C {180°F}: Go to the symptom troubleshooting "No. 18 Cooling system concerns - Runs cold". (See NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD ).
2	Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed?	Yes	Go to the appropriate DTC inspection. (See DTC TABLE ).
2		No	Go to the next step.
3	Access and monitor the AC_REQ, CPP (MT), CPP/PNP (MT), PSP and TR (AT) PIDs. Are the PID values normal? (See PCM INSPECTION ).	Yes	Go to the next step.
3		No	If the AC_REQ PID is not normal: Inspect the A/C switch, refrigerant pressure switch, and fan switch, following components and related wiring harnesses for vibration or intermittent open/short circuit. Refrigerant pressure switch Climate control unit (A/C switch, fan switch) (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER] ). (See CLIMATE CONTROL UNIT INSPECTION (MANUAL AIR CONDITIONER) ). Wiring harness between climate control unit terminal K and CM terminal 1AU Wiring harness between climate control unit terminal H and body ground If the CPP PID is not normal: Inspect CPP switch and related wiring harness for vibration or intermittent open/short circuit. (See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION ). If the CPP/PNP PID is not normal: Inspect the neutral switch and related wiring harness for vibration or intermittent open/short circuit. (See NEUTRAL SWITCH INSPECTION ). If the PSP PID is not normal: Inspect the PSP switch and related wiring harness foe vibration of intermittent open or short circuit. (See POWER STEERING PRESSURE (PSP) SWITCH INSPECTION ). If the TR PID is not normal: Inspect the TR switch and related wiring harness for vibration or intermittent open/short circuit. (See TRANSMISSION RANGE (TR) SWITCH INSPECTION ).
4	Is there air leakage felt or heard at intake-air system components while racing engine to higher speed?	Yes	Repair or replace the parts if necessary.
4		No	Inspect the following: Electronic throttle control system operation APP sensor
5	Verify test results. If normal, return to diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX ). If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION ).