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

NO. 12 LACK/LOSS OF POWER-ACCELERATION/CRUISE (SKYACTIV-G 2.0, SKYACTIV-G 2.5)

12  LACK/LOSS OF POWER-ACCELERATION/CRUISE 
DESCRIPTION 
  • Performance is poor under load, (e.g., power down when climbing hills)
POSSIBLE CAUSE 
  • Engine overheating
  • Drive-by-wire control system operates with brake override system
  • PCM DTC is stored
  • 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
  • Erratic signal to PCM
    • APP sensor or related circuit malfunction
    • CPP switch or related circuit malfunction (MTX)
    • 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
  • Fuel leakage
  • Poor fuel quality
  • Air leakage or restriction in intake-air system
  • Air cleaner restricted or dirty
  • Vacuum leakage
  • Clutch slippage (MTX)
  • Brake dragging
  • Tire air pressure malfunction
  • Erratic or no signal from CMP sensor
    • Loose installation
    • Damaged trigger wheel (intake camshaft and/or exhaust camshaft)
    • Open or short circuit in related wiring harness
  • Erratic signal from CKP sensor
    • Loose installation
    • Damaged trigger wheel (crankshaft pulley)
    • 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
    • Fuel pump mechanical malfunction
  • Improper operation of electric variable valve timing control system (PCM DTC is stored.)
  • Improper operation of hydraulic variable valve timing control system
  • Throttle valve clogged
  • Low engine compression
  • Improper intake valve timing due to timing chain jumping
  • Improper exhaust valve timing due to timing chain jumping
  • Spark plug malfunction
  • Incorrect signal to ignition coil
  • Exhaust system and/or TWC restriction
  • PCV valve malfunction
  • Injector driver (built-into PCM) malfunction
  • ATX internal malfunction (ATX)
    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 matter.
CAUTION:
  • Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
RELATED PIDS

Item (definition) Unit/Condition Definition Condition/Specification (Reference)
APP1 % APP sensor No. 1
  • Accelerator pedal released: Approx. 15%
  • Accelerator pedal depressed: Approx. 82%
V
  • Accelerator pedal released: Approx. 0.75 V
  • Accelerator pedal depressed: Approx. 4.1 V
APP2 % APP sensor No. 2
  • Accelerator pedal released: Approx. 7.45%
  • Accelerator pedal depressed: Approx. 41%
V
  • Accelerator pedal released: Approx. 0.38 V
  • Accelerator pedal depressed: Approx. 2.05 V
CPP (MTX) Off/On Clutch pedal position
  • Clutch pedal released: Off
  • Clutch pedal depressed: On
CPP/PNP (MTX) Off/On Shift lever position
  • Other than neutral: Off
  • Neutral: On
ECT °C, °F Engine coolant temperature (No. 1)
  • Displays ECT
V
  • ECT is 20 °C {68 °F}: Approx. 3.10 V
  • ECT is 40 °C {104 °F}: Approx. 2.16 V
  • ECT is 60 °C {140 °F}: Approx. 1.40 V
  • ECT is 80 °C {176 °F}: Approx. 0.87 V
  • ECT is 100 °C {212 °F}: Approx. 0.54 V
FUEL_PRES KPa {MPa}, mBar {Bar}, psi, in H20 Fuel pressure
  • Displays fuel pressure
V
  • Fuel pressure is 3.0 MPa {31 kgf/cm2 , 435 psi}: Approx. 0.92 V
  • Fuel pressure is 4.8 MPa {49 kgf/cm2 , 696 psi}: Approx. 1.17 V
IAT °C, °F Intake air temperature (No. 1)
  • Displays IAT (No. 1)
V
  • IAT is 20 °C {68 °F}: Approx. 2.70 V
  • IAT is 40 °C {104 °F}: Approx. 1.80 V
  • IAT is 60 °C {140 °F}: Approx. 1.20 V
LOAD % Engine load
  • Idle (after warm up): Approx. 16.07%
  • Racing (engine speed is 2, 000 rpm): Approx. 14.51%
  • Racing (engine speed is 4, 000 rpm): Approx. 21.17%
LONGFT1 % Long term fuel trim
  • Idle (after warm up): Approx. -2.34%
  • Racing (engine speed is 2, 000 rpm): Approx. -0.78%
  • Racing (engine speed is 4, 000 rpm): Approx. -0.78%
MAF g/Sec Mass air flow
  • Displays MAF
V
  • Switch ignition ON (MAF: 0.59 g/s {0.078 lb/min}): Approx. 0.72 V
  • Idle (after warm up) (MAF: 2.17 g/s {0.287 lb/min}): Approx. 0.86 V
  • Racing (engine speed is 2, 000 rpm) (MAF: 4.73 g/s {0.626 lb/min}): Approx. 1.07 V
MAP KPa {MPa}, mBar {Bar}, psi, in H20 Manifold absolute pressure
  • Displays MAP
V
  • Switch ignition ON (MAP: 101 kPa {1.03 kgf/cm2 , 14.6 psi}): Approx. 4.07 V
  • Idle (after warm up) (MAP: 33 kPa {0.34 kgf/cm2 , 4.8 psi}): Approx. 1.34 V
  • Racing (engine speed is 2, 000 rpm) (MAP: 26 kPa {0.27 kgf/cm2 , 3.8 psi}): Approx. 1.05 V
O2S11 μA A/F sensor
  • Idle (after warm up): Approx. -39 μA
  • Deceleration fuel cut (accelerator pedal released from engine speed of 4, 000 rpm or more): Approx. 3.84 mA
O2S12 V HO2S
  • Idle (after warm up): 0-1.0 V
  • Deceleration fuel cut (accelerator pedal released from engine speed of 4, 000 rpm or more): Approx. 0 V
RPM RPM Engine speed
  • Displays engine speed
SHRTFT1 % Short term fuel trim
  • Idle (after warm up): Approx. 1.56%
  • Racing (engine speed is 2, 000 rpm): Approx. -3.12%
  • Racing (engine speed is 4, 000 rpm): Approx. -8.59%
TP REL % Throttle position signal (relative value)
  • Accelerator pedal released: Approx. 12%
  • Accelerator pedal depressed: Approx. 82%
VSS KPH, MPH Vehicle speed
  • Displays vehicle speed
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