No. 12 Lack/Loss Of Power-Acceleration/Cruise: Notes

SYMPTOM TROUBLESHOOTING - NO. 12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [L3]

12	LACK/LOSS OF POWER - ACCELERATION/CRUISE
DESCRIPTION	Performance is poor under load (such as power down when climbing hills).
POSSIBLE CAUSE	Poor fuel quality Air leakage from intake air system Intake air system restriction Intake air temperature too hot Improper installation of EGR valve Vacuum leakage PCM DTC is stored Engine overheating APP sensor malfunction TP sensor malfunction CKP sensor and related wiring harness malfunction MAF sensor and related wiring harness malfunction IAT sensor or related wiring harness malfunction Battery power supply circuit malfunction VSS and related wiring harness malfunction CKP sensor and teeth of crankshaft pulley malfunction Spark plug malfunction Ignition coil malfunction Improper operation of electronic throttle control system Exhaust system part malfunction Excessive/Inadequate fuel pressure Intermittent open or short in fuel pump related circuit Fuel pump mechanical malfunction Fuel line restriction or clogging Fuel leakage from fuel injector Fuel injector is clogging Improper operation of variable tumble control Improper operation of variable intake air control Improper operation of A/C system Purge solenoid valve malfunction Evaporative emission control system malfunction CMP sensor and teeth of camshaft malfunction Improper EGR valve operation Improper operation of variable valve timing control system Low engine compression Improper valve timing PCV valve malfunction Brake dragging ATX malfunction (ATX) Clutch slippage (MTX) 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 service information. (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.

LACK/LOSS OF POWER - ACCELERATION/CRUISE

DESCRIPTION

Performance is poor under load (such as power down when climbing hills).

POSSIBLE CAUSE

Poor fuel quality
Air leakage from intake air system
Intake air system restriction
Intake air temperature too hot
Improper installation of EGR valve
Vacuum leakage
PCM DTC is stored
Engine overheating
APP sensor malfunction
TP sensor malfunction
CKP sensor and related wiring harness malfunction
MAF sensor and related wiring harness malfunction
IAT sensor or related wiring harness malfunction
Battery power supply circuit malfunction
VSS and related wiring harness malfunction
CKP sensor and teeth of crankshaft pulley malfunction
Spark plug malfunction
Ignition coil malfunction
Improper operation of electronic throttle control system
Exhaust system part malfunction
Excessive/Inadequate fuel pressure
- Intermittent open or short in fuel pump related circuit
- Fuel pump mechanical malfunction
- Fuel line restriction or clogging
- Fuel leakage from fuel injector
- Fuel injector is clogging
Improper operation of variable tumble control
Improper operation of variable intake air control
Improper operation of A/C system
Purge solenoid valve malfunction
Evaporative emission control system malfunction
CMP sensor and teeth of camshaft malfunction
Improper EGR valve operation
Improper operation of variable valve timing control system
Low engine compression
Improper valve timing
PCV valve malfunction
Brake dragging
ATX malfunction (ATX)
Clutch slippage (MTX)
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 service information.
  (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.