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

NO. 12 LACK/LOSS OF POWER-ACCELERATION/CRUISE (L3 WITH TC) DESCRIPTION AND POSSIBLE CAUSE

12	LACK/LOSS OF POWER-ACCELERATION/CRUISE
DESCRIPTION	Performance is poor under load (e.g., power down when climbing hills).
POSSIBLE CAUSE	Improper operation of A/C system Improper operation of A/C cut-off control Air leakage or restriction from intake-air system Loose turbocharger compressor to intake manifold duct connecting Turbocharger rotating assembly binding or dragging Wastegate control solenoid valve malfunction (stuck open) Turbocharger malfunction Charge air cooler malfunction Variable swirl system malfunction Improper operation of electronic throttle control system Purge solenoid valve malfunction EGR system malfunction Brake dragging Low engine compression Poor fuel quality Vacuum leakage Incorrect signal to ignition coil Spark plug malfunction Engine overheating Throttle body malfunction Air cleaner restriction or dirty PCV valve malfunction Improper valve timing due to jumping out of timing chain Improper operation of variable valve timing control system Restriction in exhaust system or TWC Leakage at exhaust manifold or turbocharger mounting flange Intermittent open or short fuel pump related circuit Inadequate fuel pressure (high-or low pressure side) Fuel pressure sensor (built-in fuel delivery pipe) malfunction Spill valve control solenoid valve malfunction (built-in high pressure fuel pump) Relief valve malfunction (built-in fuel delivery pipe) High pressure fuel pump malfunction Improper operation of fuel pump speed control Fuel pump mechanical malfunction Fuel line restriction or clogging Fuel injector malfunction Incorrect fuel injection timing Erratic signal from CKP sensor Erratic or no signal from CMP sensor ECT sensor No. 1 or related circuit malfunction MAP sensor (integrated in MAP sensor/boost air temperature sensor) or related circuit malfunction APP sensor or related circuit malfunction MAF/IAT sensor or related circuit malfunction Boost air temperature sensor (integrated in MAP sensor/boost air temperature sensor) or related circuit malfunction Intermittent open or short circuit MAF sensor, APP sensor, TP sensor and VSS Clutch slippage 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". (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.

LACK/LOSS OF POWER-ACCELERATION/CRUISE

DESCRIPTION

Performance is poor under load (e.g., power down when climbing hills).

POSSIBLE CAUSE

Improper operation of A/C system
Improper operation of A/C cut-off control
Air leakage or restriction from intake-air system
Loose turbocharger compressor to intake manifold duct connecting
Turbocharger rotating assembly binding or dragging
Wastegate control solenoid valve malfunction (stuck open)
Turbocharger malfunction
Charge air cooler malfunction
Variable swirl system malfunction
Improper operation of electronic throttle control system
Purge solenoid valve malfunction
EGR system malfunction
Brake dragging
Low engine compression
Poor fuel quality
Vacuum leakage
Incorrect signal to ignition coil
Spark plug malfunction
Engine overheating
Throttle body malfunction
Air cleaner restriction or dirty
PCV valve malfunction
Improper valve timing due to jumping out of timing chain
Improper operation of variable valve timing control system
Restriction in exhaust system or TWC
Leakage at exhaust manifold or turbocharger mounting flange
Intermittent open or short fuel pump related circuit
Inadequate fuel pressure (high-or low pressure side)
Fuel pressure sensor (built-in fuel delivery pipe) malfunction
Spill valve control solenoid valve malfunction (built-in high pressure fuel pump)
Relief valve malfunction (built-in fuel delivery pipe)
High pressure fuel pump malfunction
Improper operation of fuel pump speed control
Fuel pump mechanical malfunction
Fuel line restriction or clogging
Fuel injector malfunction
Incorrect fuel injection timing
Erratic signal from CKP sensor
Erratic or no signal from CMP sensor
ECT sensor No. 1 or related circuit malfunction
MAP sensor (integrated in MAP sensor/boost air temperature sensor) or related circuit malfunction
APP sensor or related circuit malfunction
MAF/IAT sensor or related circuit malfunction
Boost air temperature sensor (integrated in MAP sensor/boost air temperature sensor) or related circuit malfunction
Intermittent open or short circuit MAF sensor, APP sensor, TP sensor and VSS
Clutch slippage
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". (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.