| POSSIBLE CAUSE |
- Vacuum leakage
- Restriction in intake-air system
- Air leakage from intake-air system parts
- Poor fuel quality
- PCM DTC is stored.
- Engine overheating
- Intake air temperature too hot
- Erratic signal to PCM
- APP sensor or related circuit malfunction
- MAF sensor or related circuit malfunction
- TP sensor or related circuit malfunction
- IAT sensor or related circuit malfunction
- CKP sensor or related circuit malfunction
- VSS or related circuit malfunction
- Erratic signal from CKP sensor
- Fuel leakage from fuel injector
- Fuel injector clogging
- Throttle body restriction or clogged
- Improper operation of drive-by-wire control system
- Restriction in exhaust system
- Inadequate fuel pressure
- Open or short in fuel pump related circuit
- Fuel pump mechanical malfunction
- Fuel line restriction or clogging
- Pressure regulator malfunction (built-in fuel pump unit)
- Improper A/C system operation
- Improper A/C cut-off operation
- PCV valve malfunction
- Purge control solenoid malfunction
- Erratic signal or no signal from CMP sensor
- Improper variable valve timing control operation
- Low engine compression
- Improper valve timing due to jumping out of timing chain
- ATX malfunction
- Brake dragging
WARNING:
- The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system:
- 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 injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION
.) (See AFTER SERVICE PRECAUTION
.)
CAUTION:
- Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.
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