| POSSIBLE CAUSE |
- Poor fuel quality
- Air leakage from intake-air system
- Intake-air system restriction
- Electrical connector disconnected
- PCM poor ground
- Fuel leakage
- Vacuum leakage
- PCM DTC is stored
- Engine overheating
- No battery power supply
- Improper operation of A/C system
- Improper operation of drive-by-wire control system
- Purge solenoid valve malfunction
- EGR valve malfunction
- Improper operation of variable valve timing control system
- Erratic signal from CMP sensor
- Loose installation
- Damaged trigger wheel (camshaft)
- Open or short circuit in related wiring harness
- No signal from CKP sensor
- Loose installation
- Damaged trigger wheel (crankshaft pulley)
- Open or short circuit in related wiring harness
- Erratic signal to PCM
- APP sensor or related circuit malfunction
- ECT sensor No.1 or related circuit malfunction
- MAF sensor (integrated in MAF/IAT sensor) or related circuit malfunction
- A/F sensor or related circuit malfunction
- HO2S or related circuit malfunction
- Improper air/fuel mixture ratio control
- Exhaust system and/or TWC restricted or clogged
- Ignition system malfunction
- Spark plug malfunction
- Ignition coil malfunction
- Ignition coil related wiring harness malfunction
- Inadequate fuel pressure (high or low pressure side)
- Open or short circuit in the fuel pump (low-side) body or related wiring harness
- Fuel pressure sensor or related circuit malfunction
- Fuel pump (low-side) body mechanical malfunction
- High pressure fuel pump malfunction
- Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system)
- Spill valve control solenoid valve malfunction (built-into high pressure fuel pump)
- Relief valve malfunction (built-into fuel delivery pipe)
- Fuel line restriction
- Fuel filter clogged
- Fuel pump resister or related circuit malfunction
- Incorrect fuel injection timing
- Fuel injector malfunction
- Low engine compression
- Engine internal part malfunction
- Improper valve timing
- PCV valve malfunction
- Fuel injector control 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.
- 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION
.) (See AFTER SERVICE PRECAUTION
.)
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.
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