NO.9 FAST IDLE/RUNS ON [L3 R.H.D.]

id0103a4801500

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
• Accelerator cable free play misadjustment
• Improper load signal input

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION

1
Connect the WDS or equivalent to the DLC-2.
Access the ECT PID.
Start and warm up engine to normal operating temperature.
Is the ECT PID between 82-112×C {180-234×F}?
Yes
Go to the next step.
No

ECT PID is higher than 112×C {234×F}:

Go to symptom troubleshooting "No.17 Cooling system concerns - Overheating".

ECT PID is less than 82×C {180×F}:

Go to symptom troubleshooting "No.18 Cooling system concerns - Runs cold".
2
Connect the WDS or equivalent to the DLC-2.
Retrieve any continuous memory DTCs.
Are any DTCs displayed?
Yes

DTC is displayed:

Go to the appropriate DTC inspection.
No

No DTC is displayed:

Go to the next step.
3
Connect the WDS or equivalent to the DLC-2.
Access the AC_REQ, CPP, CPP/PNP, and PSP PIDs.
Monitor each PID.
Are the PIDs normal?
Yes
Go to the next step.
No

AC_REQ PID:

Inspect the A/C switch, refrigerant pressure switch and the fan switch.

CPP PID:

Inspect the clutch pedal position switch.

CPP/PNP PID:

Inspect the neutral switch.
PSP PID:
Inspect the PSP switch
4
Is air leakage felt or heard at the intake-air system components while racing engine to a higher speed?
Yes
Repair or replace as necessary.
No
Verify the accelerator cable free play.
5
Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If any malfunction remains, inspect related service information, and repair or diagnosis.
- If the vehicle is repaired, troubleshooting is completed.
- If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.
(See PCM REMOVAL/INSTALLATION [L3].)