Mazda 3 Workshop Manual page 561

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Engine overheating
• Vacuum leakage
• Erratic signal to ignition coil
• Improper air/fuel mixture ratio control
• Poor fuel quality
• PCV valve malfunction
• Restriction in intake-air system
• Restriction in exhaust system
• Disconnected electrical connector
• Open or short circuit in fuel pump body and related wiring harness
• Inadequate fuel pressure
• Fuel pump mechanical malfunction
• Fuel leakage from injector
• Fuel injector is clogged.
• Purge valve malfunction
• Spark plug malfunction
• Ignition coil malfunction
• Improper valve timing
• Immobilizer system and/or circuit malfunction (if equipped)
• Immobilizer system operating properly. (Ignition key is not registered)
• Pressure regulator malfunction
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
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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.
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PRECAUTION.)
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