Lack/Loss Of Power-Acceleration/Cruise: Notes
LACK/LOSS OF POWER-ACCELERATION/CRUISE (VIN Y) DESCRIPTION AND POSSIBLE CAUSE
| Troubleshooting item |
Lack/Loss of power-acceleration/cruise |
| Description |
- Engine speed increase delays when the accelerator pedal is fully depressed.
|
| Possible cause |
- Engine overheating
- The engine torque control is activated when the engine coolant temperature is high
- Drive-by-wire control system operates with brake override system
- PCM DTC is stored
- Erratic signal to PCM
- APP sensor or related circuit malfunction
- ECT sensor No. 1 or related circuit malfunction
- ECT sensor No. 2 or related circuit malfunction
- High fuel pressure sensor or related circuit malfunction
- MAF sensor or related circuit malfunction
- MAP sensor or related circuit malfunction
- IAT sensor No. 1 (integrated in MAF sensor/IAT sensor No. 1) or related circuit malfunction
- IAT sensor No. 2 (integrated in MAP sensor/IAT sensor No. 2) or related circuit malfunction
- A/F sensor or related circuit malfunction
- HO2S or related circuit malfunction
- Boost air temperature sensor or related circuit malfunction
- Boost pressure sensor or related circuit malfunction
- Communication error between TCM and PCM
- 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
- Air cleaner restricted or dirty
- Vacuum leakage
- Brake dragging
- Improper tire air pressure
- 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
- Water-cooled charge air cooler system malfunction
- Water-cooled charge air cooler malfunction
- Electric water pump malfunction
- Inadequate fuel pressure (high or low pressure side)
- High 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 malfunction (built-into high pressure fuel pump)
- 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
- Fuel pump control module malfunction
- Throttle valve restricted or clogged
- Low engine compression
- Wastegate control system malfunction
- Wastegate valve stuck open
- Wastegate valve position sensor malfunction
- Wastegate valve actuator malfunction
|
| Possible cause |
- 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
- Three way solenoid valve malfunction
- Exhaust system and/or TWC restriction
- EGR system malfunction
- EGR valve malfunction
- Turbocharger malfunction
- PCV valve malfunction
- Injector driver (built-into PCM) malfunction
- ATX internal malfunction
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.
- Highly pressurized fuel may spray out if the fuel line is cut. Due to the following dangers occurring with a fuel spray, always complete the "Fuel Line Safety Procedure" to prevent the fuel from spraying. (See BEFORE SERVICE PRECAUTION [(VIN Y) (US)]
.)
- Fuel may cause irritation if it comes in contact with skin and eyes.
- If fuel ignites and causes a fire, it may lead to serious injury or death, and damage to property and facilities.
- Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. Always refer to the "Quick Release Connector Removal/Installation (fuel system)" before performing the fuel hose installation, and execute the "Fuel Leakage Inspection" after installation. (See QUICK RELEASE CONNECTOR (FUEL SYSTEM) REMOVAL/INSTALLATION [(VIN Y) (US)]
.) (See AFTER SERVICE PRECAUTION [(VIN Y) (US)]
.)
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.
|
 Courtesy of MAZDA MOTORS CORP.
|
CAUTION:
- Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.