Exhaust Smoke (Us): Notes

EXHAUST SMOKE (SKYACTIV-G, US) DESCRIPTION AND POSSIBLE CAUSE

Troubleshooting item	Exhaust smoke
Description	Blue, black, or white smoke from exhaust system.
Possible cause	Blue smoke (Burning oil): PCV valve malfunction Engine internal oil leakage White smoke (Water in combustion): Cooling system malfunction (coolant loss) Engine internal coolant leakage Black smoke (Rich fuel mixture): 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 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 TP sensor or related circuit malfunction Improper fuel injection timing and amount Air cleaner restriction Intake-air system is collapsed or restricted Leakage at engine intake manifold and/or exhaust manifold Inadequate/Excessive fuel pressure 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 pump unit malfunction Ignition system malfunction Ignition coil malfunction Spark plug malfunction Improper engine compression Improper intake valve timing Improper exhaust valve timing 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.