Lack/Loss Of Power-Acceleration/Cruise: Notes
LACK/LOSS OF POWER-ACCELERATION/CRUISE (VINs 7, L, M), US) DESCRIPTION AND POSSIBLE CAUSE
| Troubleshooting item |
Lack/Loss of power-acceleration/cruise |
| Description |
- Engine speed increase delays when the accelerator pedal is fully depressed.
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| Possible cause |
NOTE:
- Even though the fuel gauge indicates the presence of sufficient fuel, the fuel is not transferred from the fuel tank (sub) to the fuel tank (main), which may cause fuel shortage and then engine stalling. The body control module (BCM) triggers the low fuel warning light to flash to alert the customer of the risk of engine stalling.
- Low fuel tank level
- PCM reprogramming not implemented
- Engine overheating
- Drive-by-wire control system operates with brake override system
- PCM DTC is stored
- Erratic signal to PCM
- APP sensor or related circuit malfunction
- Clutch stroke sensor or related circuit malfunction (MTX)
- Communication error between TCM and PCM (ATX)
- ECT sensor No. 1 or related circuit malfunction
- ECT sensor No. 2 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 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
- Vacuum leakage
- Air cleaner restricted or dirty
- Clutch slippage (MTX)
- 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
- Inadequate fuel pressure (high 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 malfunction (built-into high pressure fuel pump)
- Relief valve (built-into high pressure fuel pump) malfunction
- Low-pressure side fuel delivery system malfunction
- Battery voltage decrease
- Fuel pump unit malfunction
- Fuel filter (high-pressure) clogged (built-into fuel pump unit)
- Fuel filter (low-pressure) clogged (built-into fuel pump unit)
- Pressure regulator (built-into fuel pump unit) malfunction
- Jet pump (built-into fuel pump unit) malfunction
- Clogging in hose between fuel tank (main) and fuel tank (sub)
- Disconnected hose between fuel tank (main) and fuel tank (sub)
|
| Possible cause |
- Throttle valve restricted or clogged
- Low engine compression
- 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
- Exhaust system and/or TWC restriction
- PCV valve malfunction
- Injector driver (built-into PCM) malfunction
- ATX internal malfunction (ATX)
|
| Possible cause |
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 M)]
.) (See BEFORE SERVICE PRECAUTION [(VIN 7 & VIN L)]
.)
- 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.
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.
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 Courtesy of MAZDA MOTORS CORP.
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CAUTION:
- Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.