Mazda 3 Workshop Manual page 452

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Spark plug malfunction
• Air leakage from intake-air system
• Erratic signal from CKP sensor
• Erratic signal from CMP sensor
• Improper air/fuel mixture ratio control
• Air cleaner restriction
• IAC valve malfunction
• PCV valve malfunction
• Inadequate fuel pressure
• Purge solenoid valve malfunction
• MAF sensor contamination
• Incorrect MAF sensor GND voltage
• Restriction in exhaust system
• EGR valve malfunction
• 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:
Diagnostic procedure
STEP INSPECTION
Inspect for the following:
1
• Vacuum leakage
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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 the "BEFORE SERVICE PRECAUTION" and
"AFTER SERVICE PRECAUTION" described in this manual.
(See BEFORE SERVICE
(See AFTER SERVICE PRECAUTION.)
Caution
• If there is foreign material on the connecting area of the quick release
connector, it might damage the connector or fuel pipe. To prevent this,
disconnect the connector and clean the connecting area before connecting.
RESULTS
Yes
No
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PRECAUTION.)
Go to the next step.
Service if necessary.
Repeat Step 1.
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ACTION