No. 12 Lack/Loss Of Power-Acceleration/Cruise [L5]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

12	LACK/LOSS OF POWER - ACCELERATION/CRUISE
DESCRIPTION	Performance is poor under load (such as power down when climbing hills).
POSSIBLE CAUSE	Improper A/C system operation Erratic signal or no signal from CMP sensor Air leakage from intake air system parts Restriction in intake air system Intake air temperature too hot Improper variable intake air control operation Improper variable tumble control operation Improper operation of electronic throttle control system Purge solenoid valve malfunction Improper EGR valve operation Brake dragging Erratic signal from CKP sensor Low engine compression Vacuum leakage Poor fuel quality Erratic signal to ignition coil Engine overheating Throttle body malfunction Spark plug malfunction PCV valve malfunction Improper valve timing due to jumping out of timing chain Improper variable valve timing control operation Restriction in exhaust system Intermittent open or short in fuel pump related circuit Inadequate fuel pressure Fuel pump mechanical malfunction Fuel line restriction or clogging Fuel leakage from fuel injector Fuel injector clogging Erratic signal from APP sensor Erratic signal from TP sensor Intermittent open or short circuit in MAF sensor, APP sensor, TP sensor, IAT sensor and VSS 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 [L5] .) (See AFTER SERVICE PRECAUTION [L5] .) CAUTION: Disconnecting/connecting the quick release connector without cleaning it may cause damage to the fuel pipe and the quick release connector. Always clean the 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

Improper A/C system operation
Erratic signal or no signal from CMP sensor
Air leakage from intake air system parts
Restriction in intake air system
Intake air temperature too hot
Improper variable intake air control operation
Improper variable tumble control operation
Improper operation of electronic throttle control system
Purge solenoid valve malfunction
Improper EGR valve operation
Brake dragging
Erratic signal from CKP sensor
Low engine compression
Vacuum leakage
Poor fuel quality
Erratic signal to ignition coil
Engine overheating
Throttle body malfunction
Spark plug malfunction
PCV valve malfunction
Improper valve timing due to jumping out of timing chain
Improper variable valve timing control operation
Restriction in exhaust system
Intermittent open or short in fuel pump related circuit
Inadequate fuel pressure
Fuel pump mechanical malfunction
Fuel line restriction or clogging
Fuel leakage from fuel injector
Fuel injector clogging
Erratic signal from APP sensor
Erratic signal from TP sensor
Intermittent open or short circuit in MAF sensor, APP sensor, TP sensor, IAT sensor and VSS
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 [L5] .)
  
  (See AFTER SERVICE PRECAUTION [L5] .)
CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may cause damage to the fuel pipe and the quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.