NO.9 FAST IDLE/RUNS ON [ZJ, Z6]

#
NO.9 FAST IDLE/RUNS ON [ZJ, Z6]

B3E010318881W42

9 | FAST IDLE/RUNS ON
--- | ---
DESCRIPTION | • The engine speed continues during at fast idle after warm-up. • The engine runs after the ignition switch is 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 ECT PID. Start and warm-up the engine to normal operating temperature. Is ECT PID 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 symptom troubleshooting "No.17 Cooling system concerns - Overheating".
(See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [ZJ, Z6].)

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 [ZJ, Z6].)

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 inspection. (See DTC TABLE [ZJ, Z6].)
No | No DTC is displayed: Go to the next step.
3 | Connect the WDS or equivalent to the DLC-2. Access AC_REQ, CPP, CPP/PNP, TR and PSP PIDs. Monitor each PID. (See PCM INSPECTION [ZJ, Z6].) Are PIDs normal? | Yes | Go to the next step.

No

AC_REQ PID:

Inspect the A/C switch, refrigerant pressure switch and fan switch.
(See REFRIGERANT PRESSURE SWITCH INSPECTION.)

CPP PID:

Inspect the clutch pedal position switch (MTX).
(See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION [ZJ, Z6].)

CPP/PNP PID:

Inspect the neutral switch (MTX).
(See NEUTRAL SWITCH INSPECTION [ZJ, Z6].)

TR PID:

Inspect the TR switch (ATX).
(See TRANSAXLE RANGE (TR) SWITCH INSPECTION.)

PSP PID:

Inspect the PSP switch.
(See POWER STEERING PRESSURE (PSP) SWITCH INSPECTION [ZJ, Z6].)

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 part if necessary.
No | Verify accelerator cable free play. (See ACCELERATOR CABLE INSPECTION/ADJUSTMENT [ZJ, Z6].)

5

Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING [ZJ, Z6].)
• If malfunction remains, inspect related Service information perform repair or diagnosis.

  - If vehicle repaired, troubleshooting completed.
  - If vehicle not repaired or additional diagnostic information not available, replace the PCM.
  (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [ZJ, Z6].)