NO.9 FAST IDLE/RUNS ON [LF, L3]

id0103008015b2

9

FAST IDLE/RUNS ON

DESCRIPTION

• Engine speed continues at fast idle after warm-up.
• Engine runs after the ignition switch is turned off.

POSSIBLE CAUSE

• ECT sensor malfunction
• Air leakage from the intake-air system
• Throttle body malfunction
• Accelerator cable free play misadjustment
• Cruise control cable 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 the engine to normal operating temperature.
Is the ECT PID reading 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 the symptom troubleshooting "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".
2
Connect the WDS or equivalent to the DLC-2.
Retrieve any continuous memory DTCs.
Are there any DTCs displayed?
Yes

DTC is displayed:

Go to the appropriate DTC test.
No

No DTC is displayed:

Go to the next step.
3
Connect the WDS or equivalent to the DLC-2.
Access the ACSW, COLP, CPP, CPP/PNP, TR and PSP PIDs.
Monitor each PID.
Are PIDs normal?
Yes
Go to the next step.
No
ACSW PID: Inspect the A/C switch, refrigerant pressure switch and the fan switch.
COLP PID: Inspect the refrigerant pressure switch (middle pressure).
CPP PID: Inspect the clutch pedal position switch (MTX).
CPP/PNP PID: Inspect the neutral switch (MTX)
TR PID: TR switch (ATX).
PSP PID: Inspect the P/S pressure switch.
4
Is there air leakage felt or heard at the intake-air system components while racing the engine to a higher speed?
Yes
Repair or replace parts if necessary.
No
Verify accelerator cable free play.
5
Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace the PCM.