Mazda 3 Workshop Manual page 594

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Charcoal canister damage
• Air cleaner element clogging or restriction
• Throttle body malfunction
• Erratic signal to ignition coil
• Improper air/fuel mixture ratio control operation
• Bend or open circuit HO2S wiring harness
• Catalyst converter malfunction
• Engine internal parts malfunction
• Excessive carbon is built up in combustion chamber
• Improper engine compression
• Improper valve timing
The following troubleshooting flow chart contains fuel system diagnosis and repair
procedures. Read following warnings before performing fuel system services:
Diagnostic procedure
STEP INSPECTION
Inspect the following:
• Vacuum lines for leakage or
blockage
1
• Electrical connections
• Proper maintenance schedule
followed
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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
Yes
No
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PRECAUTION.)
ACTION
Go to the next step.
Service if necessary.
Repeat Step 1.
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