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NO.9 FAST IDLE/RUNS ON [WITH WU-TWC]

id0103008015c5

9 | FAST IDLE/RUNS ON
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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 • Steering angle sensor or related circuit malfunction

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
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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 more 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. Note • With the ignition switch off, the SWA PID value is cleared to initial value (300 °). If the SWA PID does not move from 300 °, drive the vehicle above 20km/h {12 mph} to set the steering angle sensor to the straight ahead position. Access the ACSW, A/CL V, CPP, CPP/PNP, SWA, TR and PSP PIDs. Monitor each PID. (See PCM INSPECTION [WITHOUT WU-TWC].) Are PIDs normal? | Yes | Go to the next step.
No | ACSW PID: Inspect the A/C switch, refrigerant pressure switch and fan switch. A/CL V 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) SWA PID: Inspect the steering angle sensor TR PID: Inspect the TR switch (ATX). PSP PID: Inspect the PSP 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 the accelerator cable free play.
5 | Verify the test results. • If normal, return to the diagnostic index to service any additional symptoms. • If the malfunction remains, inspect related Service information and perform repair or diagnosis. - If the vehicle is repaired, the troubleshooting is completed. - If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.