Mazda 3 Workshop Manual page 602

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
White smoke (Water in combustion):
• Cooling system malfunction (coolant loss)
• Engine internal coolant leakage
Black smoke (Rich fuel mixture):
• Air cleaner restriction
• Intake-air system is collapsed or restricted.
• Fuel return line is restricted.
• Excessive fuel pressure
• Improper engine compression
• Injector fuel leakage
• Ignition system malfunction
The following troubleshooting flow chart contains fuel system diagnosis and repair
procedures. Read following warnings before performing fuel system services:
Diagnostic procedure
STEP INSPECTION
What color is smoke coming from
1
the exhaust system?
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Warning
• 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 injuries 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 manual.
(See BEFORE SERVICE
(See AFTER SERVICE PRECAUTION.)
Caution
• Disconnecting/connecting quick release connector without cleaning it may
possibly cause damage to fuel pipe and quick release connector. Always clean
quick release connector joint area before disconnecting/connecting, and make
sure that it is free of foreign material.
RESULTS
Blue
White
Black
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PRECAUTION.)
ACTION
Burning oil is indicated.
Go to the next step.
Water in combustion is indicated.
Go to Step 3.
Rich fuel mixture is indicated.
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