Lack/Loss Of Power-Acceleration/Cruise: Outline
LACK/LOSS OF POWER-ACCELERATION/CRUISE (SKYACTIV-G) 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
- Drive-by-wire control system operates with brake override system
- PCM detects DTCs
- Erratic signal to PCM
- APP sensor or related wiring harness malfunction
- Clutch stroke sensor or related circuit malfunction (MT)
- Communication error between TCM and PCM (AT)
- ECT sensor or related wiring harness malfunction
- Fuel pressure sensor or related wiring harness malfunction
- IAT sensor No. 1 or related wiring harness malfunction
- MAF sensor or related wiring harness malfunction
- MAP sensor or related wiring harness malfunction
- A/F sensor or related wiring harness malfunction
- HO2S or related wiring harness malfunction
- Improper operation of A/C system
- Improper operation of drive-by-wire control system
- Incorrect fuel injection timing
- Fuel injector malfunction
- Purge solenoid valve malfunction
- Fuel leakage
- Poor fuel quality
- Air leakage from intake-air system
- Intake-air system restriction
- Vacuum leakage
- Air cleaner restricted or dirty
- Clutch slippage (MT)
- Brake dragging
- Tire pressure malfunction
- CKP sensor input signal malfunction
- Loose installation
- Damaged trigger wheel (crankshaft pulley)
- Open or short circuit in related wiring harness
- CMP sensor input signal error
- Loose installation
- Damaged trigger wheel (intake camshaft)
- Damaged trigger wheel (exhaust camshaft)
- Open or short circuit in related wiring harness
- Fuel system (high pressure) malfunction (fuel pressure malfunction)
- 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
|
| Possible cause |
- Fuel system (low pressure) malfunction
- Battery voltage decrease
- Fuel pump unit malfunction
- Fuel filter (high pressure) clogging (integrated with fuel pump unit)
- Fuel filter (low pressure) clogging (integrated with fuel pump unit)
- Pressure regulator (built-into fuel pump unit) malfunction
- Jet pump malfunction (integrated with fuel pump unit)
- Fuel tank malfunction
- Clogging in hose between fuel tank (main) and fuel tank (sub)
- Disconnected hose between fuel tank (main) and fuel tank (sub)
- Throttle body malfunction
- 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
- AT malfunction (AT)
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. (Refer to BEFORE SERVICE PRECAUTION [SKYACTIV-G 2.0]
in service information.)
- 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. (Refer to QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0]
in service information.) (Refer to AFTER SERVICE PRECAUTION [SKYACTIV-G 2.0]
in service information.)
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.
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| 1 |
PCM |
| 2 |
Spill valve control solenoid valve (High pressure fuel pump) |