No. 19 Exhaust Smoke: Notes

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

19	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 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 (built-into high pressure fuel pump) malfunction Relief valve (built-into high pressure fuel pump) malfunction Fuel line restricted or clogged Fuel pump unit malfunction Ignition system malfunction Improper engine compression Improper intake valve timing Improper exhaust valve timing Injector driver (built-into PCM) 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. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this article. (See BEFORE SERVICE PRECAUTION .) (See AFTER SERVICE PRECAUTION .) 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 matter.

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
- 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 (built-into high pressure fuel pump) malfunction
- Relief valve (built-into high pressure fuel pump) malfunction
- Fuel line restricted or clogged
- Fuel pump unit malfunction
Ignition system malfunction
Improper engine compression
Improper intake valve timing
Improper exhaust valve timing
Injector driver (built-into PCM) 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.
Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this article. (See BEFORE SERVICE PRECAUTION .) (See AFTER SERVICE PRECAUTION .)

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 matter.

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.