DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
POSSIBLE CAUSE
z
Fuel vapor is hazardous. It can easily ignite, causing serious injury
and damage. Always keep sparks and flames away from fuel.
z
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 REPAIR
PROCEDURE" and "AFTER REPAIR PROCEDURE" described in
this manual.
(see BEFORE REPAIR PROCEDURE [MZI-3.5] .)
(see AFTER REPAIR PROCEDURE [MZI-3.5] .)
CAUTION:
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Disconnecting/connecting quick release connector without
cleaning it may 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.
STEP INSPECTION
RESULTS ACTION
1
Visually inspect for fuel leakage at
fuel injector O-ring and fuel line.
Service if necessary.
Install the fuel pressure gauge between
the fuel pipe and the fuel distributor.
Start engine and idle it.
Measure fuel line pressure during idle.
Is fuel line pressure correct during
idle?
(see
FUEL LINE PRESSURE
INSPECTION [MZI-3.5]
.)
Yes
Go to the next step.
No
Replace the fuel pump unit.
(see
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-
3.5]
.)
2
Inspect for blockage/restriction or
open circuit in wiring harness between
the engine vacuum port and the
charcoal canister.
Inspect for blockage in fuel tank vent
system.
Is malfunction indicated?
Yes
Replace vacuum hose.
No
Go to the next step.
3
Inspect the purge solenoid valve.
(see
PURGE SOLENOID VALVE
INSPECTION [MZI-3.5]
.)
Is the solenoid operating properly?
Yes
Go to the next step.
No
Replace the purge solenoid valve.
(see
PURGE SOLENOID VALVE
REMOVAL/INSTALLATION [MZI-
3.5]
.)
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:37 AM
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© 2005 Mitchell Repair Information Company, LLC.