Mazda 3 Workshop Manual page 555

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Restriction in exhaust system
• Electrical connector disconnection
• Open or short circuit in fuel pump body and related wiring harness
• No battery power supply to PCM or poor GND
• Inadequate fuel pressure
• Fuel pump body mechanical malfunction
• Fuel leakage from fuel injector
• Fuel injector clogging
• Ignition coil malfunction
• Improper air/fuel mixture ratio control
• 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:
• 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.
Diagnostic procedure
STEP INSPECTION
Note
• The following test should be
performed for vehicles with
1
immobilizer system. Go to Step
8 for vehicles without
immobilizer system.
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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
RESULTS
Yes
No
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PRECAUTION.)
Both conditions appear:
Go to Step 3.
Either or other condition appears:
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ACTION