| 12 |
LACK/LOSS OF POWER-ACCELERATION/CRUISE |
| DESCRIPTION |
- Performance is poor under load. (e.g., power down when climbing hills)
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| POSSIBLE CAUSE |
- Engine overheating
- Drive-by-wire control system operates with brake override system
- PCM DTC is stored
- Erratic signal to PCM
- APP sensor or related circuit malfunction
- Neutral switch or related circuit malfunction (MTX)
- Communication error between TCM and PCM (ATX)
- ECT sensor No. 1 or related circuit malfunction
- Fuel pressure sensor or related circuit malfunction
- IAT sensor No. 1 (integrated in MAF sensor/IAT sensor No. 1) or related circuit malfunction
- MAF sensor or related circuit malfunction
- MAP sensor or related circuit malfunction
- A/F sensor or related circuit malfunction
- HO2S or related circuit malfunction
- Improper air/fuel mixture ratio control operation
- Intermittent open or short circuit MAF sensor, APP sensor, TP sensor
- Improper operation of A/C system
- Improper operation of drive-by-wire control system
- Throttle body malfunction
- Incorrect fuel injection timing
- Fuel injector malfunction
- Purge solenoid valve malfunction
- Fuel leakage
- Poor fuel quality
- Air leakage or restriction in intake-air system
- Vacuum leakage
- Air cleaner restricted or dirty
- Clutch slippage (MTX)
- Brake dragging
- Tire air pressure malfunction
- Erratic signal from CKP sensor
- Loose installation
- Damaged trigger wheel (crankshaft pulley)
- Open or short circuit in related wiring harness
- Erratic or no signal from CMP sensor
- Loose installation
- Damaged trigger wheel (intake camshaft)
- Damaged trigger wheel (exhaust camshaft)
- Open or short circuit in related wiring harness
- Inadequate fuel pressure (high or low pressure side)
- Fuel pressure sensor 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 (built-into high pressure fuel pump) malfunction
- Relief valve (built-into high pressure fuel pump) malfunction
- Fuel line restricted or clogged
- Fuel filter clogged (built-into fuel pump unit)
- Fuel pump mechanical malfunction
- Throttle valve restricted or clogged
- Low engine compression
- Improper intake valve timing
- Improper exhaust valve timing
- Improper operation of electric variable valve timing control system
- Electric variable valve timing driver malfunction
- Electric variable valve timing motor malfunction
- Electric variable valve timing actuator malfunction
- Improper operation of hydraulic variable valve timing control system
- Spark plug malfunction
- Ignition coil malfunction
- Exhaust system and/or TWC restriction
- PCV valve malfunction
- Injector driver (built-into PCM) malfunction
- ATX internal malfunction (ATX)
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| POSSIBLE CAUSE |
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 Repair Information. (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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