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NO.9 FAST IDLE/RUNS ON [L3 Turbo]

id0103b4801500

9 | FAST IDLE/RUNS ON
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DESCRIPTION | • Engine speed continues at fast idle after warm-up. • Engine runs after the ignition switch is turned off.
POSSIBLE CAUSE | • ECT sensor or related circuit malfunction • Suction control valve (built-in high pressure fuel pump) • Fuel injector malfunction • Air leakage from intake-air system • Throttle body malfunction • Accelerator pedal position sensor or related circuit malfunction • Cruise control system operation improperly • Improper load signal input • Improper operation of electric throttle control system • Injector driver module or related circuit malfunction Warning The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: • Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE REPAIR ROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE SERVICE PRECAUTION [L3 Turbo].) (See AFTER SERVICE PRECAUTION [L3 Turbo].) Caution • Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
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1 | Connect the WDS or equivalent to the DLC. Access the ECT PID. Start and warm-up 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". ECT PID is less than 82 °C {180 °F} Go to symptom troubleshooting "NO.18 COOLING SYSTEM CONCERNS - RUNS COLD".
2 | Perform the self-test function using the WDS or equivalent. Turn the ignition switch to the ON position. Retrieve any DTCs. Is a DTC displayed? | Yes | DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [L3 Turbo].)
No | No DTC is displayed: Go to the next step.
3 | Inspect for leakage in intake-air system. Is there any leakage found? | Yes | Repair or replace for leakage.
No | Go to the next step.
4 | Perform the TP sweep inspection. (See Electronic Throttle Control System Inspection.) Does the electronic throttle control system work properly? | Yes | Visually inspect the throttle body (damaged/scratching.) If normal, go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
5 | Connect the WDS or equivalent to the DLC-2. Access and monitor the following PIDs using the data monitor function. • ECT • APP • ACSW • CPP (PCM terminal 1H) • PNP (PCM terminal 1W) • PSP (PCM terminal 1Z) Do the PIDs indicate the correct values under trouble condition? (See Using the WDS or Equivalent.) | Yes | Go to the next step.
No | Inspect and repair or replace suspected parts and the related harnesses. If the malfunction remains, perform the intermittent concern troubleshooting. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3 Turbo].)
6 | Inspect the high pressure fuel pump. (See HIGH PRESSURE FUEL PUMP INSPECTION [L3 Turbo].) Is the high pressure fuel pump normal? | Yes | Go to the next step.
No | Replace the high pressure fuel pump.
7 | Inspect the fuel injector for each cylinder. (See FUEL INJECTOR INSPECTION [L3 Turbo].) Are fuel injectors normal? | Yes | Go to the next step.
No | Replace the suspected fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)
8 | Inspect the operation of cruise control system. Does the cruise control system work properly? | Yes | Inspect and repair or replace the injector driver module or related circuit.
No | Repair or replace the malfunctioning part according to inspection results.
9 | Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the repair or diagnosis. - If the vehicle is repaired, troubleshooting is completed. - If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.