Low Idle/Stalls During Deceleration (Us): Notes

LOW IDLE/STALLS DURING DECELERATION (SKYACTIV-G, US) DESCRIPTION AND POSSIBLE CAUSE

Troubleshooting item	Low idle/stalls during deceleration
Description	Engine speed decreases when the accelerator pedal is released. Stalls during deceleration with the accelerator pedal fully released. When the accelerator pedal is fully released, vehicle stalls directly after vehicle stops.
Possible cause	PCM DTC is stored Erratic signal to PCM APP sensor or related circuit malfunction Brake switch 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 MAF sensor or related circuit malfunction MAP sensor or related circuit malfunction A/F sensor or related circuit malfunction HO2S or related circuit malfunction TP sensor or related circuit malfunction Generator malfunction (part, system, control malfunction) Amount of generator voltage is large Improper operation of A/C magnetic clutch Improper operation of drive-by-wire control system Incorrect fuel injection timing Fuel injector malfunction Purge solenoid valve malfunction Poor fuel quality Air leakage from intake-air system Intake-air system restriction Fuel leakage Vacuum leakage Engine mount installation loose Erratic signal from CKP sensor Loose installation Damaged trigger wheel (crankshaft pulley) Open or short circuit in related wiring harness Erratic signal from CMP sensor Loose installation Damaged trigger wheel (intake camshaft and/or exhaust camshaft) Open or short circuit in related wiring harness Inadequate fuel pressure (high or low pressure side) Fuel pressure sensor or related circuit 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 restriction Fuel filter clogged Fuel pump unit malfunction Low engine compression 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 ATX malfunction (ATX) Injector driver (built-into PCM) malfunction
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 [SKYACTIV-G (VIN M (US))] .) (See BEFORE SERVICE PRECAUTION [SKYACTIV-G (VIN L (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 [SKYACTIV-G (VIN M (US))] .) (See QUICK RELEASE CONNECTOR (FUEL SYSTEM) REMOVAL/INSTALLATION [SKYACTIV-G (VIN L (US))] .) (See AFTER SERVICE PRECAUTION [SKYACTIV-G (VIN M (US))] .) (See AFTER SERVICE PRECAUTION [SKYACTIV-G (VIN L (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.