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NO.9 FAST IDLE/RUNS ON [L3]

BME010300103247

9 | FAST IDLE/RUNS ON
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DESCRIPTION | • Engine speed continues at fast idle after warm up. • Engine runs after ignition switch is turned off.
POSSIBLE CAUSE | • ECT sensor malfunction • Air leakage from 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
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1 | Connect the WDS or equivalent to the DLC-2. Access ECT PID. Start and warm up the engine to normal operating temperature. Is 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 symptom troubleshooting "No.17 Cooling system concerns - Overheating". (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L3].) ECT PID is less than 82°C {180°F}: Go to symptom troubleshooting "No.18 Cooling system concerns - Runs cold".
(See NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [L3].)
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 applicable DTC inspection. (See DTC TABLE [L3].)
No | No DTC is displayed: Go to the next step.
3 | Connect the WDS or equivalent to the DLC-2. Access AC_REQ, COLP, CPP, CPP/PNP and PSP PIDs. Monitor each PID. (See PCM INSPECTION [L3].) Are PIDs normal? | Yes | Go to the next step.
No | AC_REQ PID: Inspect the A/C switch, the refrigerant pressure switch and the fan switch. COLP PID: Inspect the refrigerant pressure switch (middle pressure). CPP PID: Inspect the clutch pedal position switch. CPP/PNP PID: Inspect the neutral switch.
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 higher speed? | Yes | Repair or replace the parts if necessary.
No | Verify the accelerator cable free play. (See ACCELERATOR CABLE INSPECTION [L3].)
5 | Verify test results. • If normal, return to diagnostic index to service any additional symptoms. • If malfunction remains, replace PCM.