Mazda 3 Workshop Manual page 605

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
The following troubleshooting flow chart contains fuel system diagnosis and repair
procedures. Read following warnings before performing fuel system services:
Diagnostic procedure
STEP INSPECTION
Visually inspect for fuel leakage at fuel
injector O-ring and fuel line.
Service if necessary.
Install fuel pressure gauge between the fuel
pipe and the fuel distributor.
1
Start the engine and idle it.
Measure the fuel line pressure during idle.
Is fuel line pressure correct during idle?
(See FUEL LINE PRESSURE
INSPECTION.)
Inspect for blockage/restriction or open
circuit in wiring harness between the engine
vacuum port and charcoal canister.
2
Inspect for blockage in the fuel tank vent
system.
Is malfunction indicated?
Inspect purge valve.
(See PURGE SOLENOID VALVE
3
INSPECTION.)
Is purge valve operating properly?
4
Downloaded from
• 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.
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PRECAUTION.)
RESULTS
Yes Go to the next step.
Replace the fuel pump unit.
No
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
Yes Replace the vacuum hose.
No Go to the next step.
Yes Go to the next step.
Replace the purge valve.
No
(See PURGE SOLENOID VALVE
REMOVAL/INSTALLATION
DTC is displayed:
Yes
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