Mazda 3 Workshop Manual page 551

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Erratic signal from CMP sensor
• Improper air/fuel mixture ratio control
• Air cleaner restriction
• IAC valve malfunction
• PCV valve malfunction
• Inadequate fuel pressure
• Purge valve malfunction
• MAF sensor contamination
• Incorrect MAF sensor GND voltage
• Restriction in exhaust system
• EGR valve malfunction
• Pressure regulator malfunction (built-in fuel pump unit)
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
Diagnostic procedure
STEP INSPECTION
Inspect for the following:
• Vacuum leakage
• Proper fuel quality (such as proper
1 octane, contamination,
winter/summer blend)
• Loose bands on intake-air system
• Cracks on intake-air system parts
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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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