Mazda 3 Workshop Manual page 591

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Spark plug malfunction
• PCV valve malfunction
• Brake dragging
• Improper valve timing due to jumping out of timing belt
• Contaminated MAF sensor
• Improper engine compression
• Exhaust system clogging
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:
• Air cleaner element for contamination
• Fuel quality
• Coolant level
1
• Brake dragging
• Clutch slippage
Are all items normal?
Connect the WDS or equivalent to the
2
DLC-2.
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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
Yes
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PRECAUTION.)
Go to the next step.
Service if necessary.
Repeat Step 1.
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE
- automotive repair manuals website
ACTION
[LF].)