NO.9 FAST IDLE/RUNS ON [13B-MSP]

id0103f2801500

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 (stuck open)

•  APP sensor malfunction

•  Cruise control system operation improperly

•  Improper load signal input

•  Improper operation of drive-by-wire control system

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 (stuck open) • APP sensor malfunction • Cruise control system operation improperly • Improper load signal input • Improper operation of drive-by-wire control system

Diagnostic procedure

STEP	INSPECTION	RESULTS	ACTION
1	Connect the M-MDS to the DLC-2. Access the ECT PID. Start and warm up the engine to normal operating temperature. Is the ECT PID reading 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 [13B-MSP].) 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 [13B-MSP].)
2	Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs for the PCM, TCM, DSC HU/CM and the EPS CM. Are there any DTCs displayed?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [13B-MSP].)
2		No	Go to the next step.
3	Access and monitor ACCS, ACSW, CPP (MT), CPP/PNP (MT), and PNP_TCM (AT) PIDs. Are PIDs values normal? (See PCM INSPECTION [13B-MSP].) (See PID/DATA MONITOR INSPECTION [SJ6A-EL].)	Yes	Go to the next step.
3		No	If the ACCS, ACSW PID is not normal: Inspect A/C switch, refrigerant pressure switch, and fan switch, and related wiring harness for vibration or intermittent open/short circuit. If the CPP PID is not normal: Inspect clutch position switch and related wiring harness for vibration or intermittent open/short circuit. If the CPP/PNP PID is not normal: Inspect neutral position switch and related wiring harness for vibration or intermittent open/short circuit. If the PNP_TCM PID is not normal: Inspect TR switch and related wiring harness for vibration or intermittent open/short circuit.
4	Is there air leakage felt or heard at the intake-air system components while the racing engine to a higher speed?	Yes	Repair or replace parts if necessary.
4		No	Inspect the following: • Drive-by-wire control system operation (See ENGINE CONTROL SYSTEM OPERATION INSPECTION [13B-MSP].) • APP sensor
5	• Verify test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If the malfunction remains, inspect the related Service Bulletins and/or the On-line Repair Information and perform the repair or diagnosis.