Fast Idle/Runs On: Notes
FAST IDLE/RUNS ON (VIN Y) DESCRIPTION AND POSSIBLE CAUSE
| Troubleshooting item |
Fast idle/runs on |
| Description |
- Engine speed continues at fast idle after warm-up.
- Engine runs after ignition is switched off.
|
| Possible cause |
- Cooling system malfunction
- PCM DTC is stored
- Accelerator pedal stuck depressed
- Erratic signal to PCM
- APP sensor or related circuit malfunction
- Communication error between TCM and PCM
- ECT sensor No. 1 or related circuit malfunction
- ECT sensor No. 2 or related circuit malfunction
- A/F sensor or related circuit malfunction
- HO2S or related circuit malfunction
- Improper load signal input
- Improper A/C request signal
- Improper operation of drive-by-wire control system
- Throttle body malfunction
- Fuel injector malfunction
- Spill valve control solenoid valve malfunction (built-into high pressure fuel pump)
- Air leakage from intake-air system
- Injector driver (built-into PCM) 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.
- Highly pressurized fuel may spray out if the fuel line is cut. Due to the following dangers occurring with a fuel spray, always complete the "Fuel Line Safety Procedure" to prevent the fuel from spraying. (See BEFORE SERVICE PRECAUTION [(VIN Y) (US)]
.)
- Fuel may cause irritation if it comes in contact with skin and eyes.
- If fuel ignites and causes a fire, it may lead to serious injury or death, and damage to property and facilities.
- Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. Always refer to the "Quick Release Connector Removal/Installation (fuel system)" before performing the fuel hose installation, and execute the "Fuel Leakage Inspection" after installation. (See QUICK RELEASE CONNECTOR (FUEL SYSTEM) REMOVAL/INSTALLATION [(VIN Y) (US)]
.) (See AFTER SERVICE PRECAUTION [(VIN Y) (US)]
.)
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.
|
| System wiring diagram |
|
| Connector diagram |
|
CAUTION:
- Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.