DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
POSSIBLE CAUSE
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Restriction in exhaust system
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Intermittent open or short circuit in fuel body pump circuit
z
Inadequate fuel pressure
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Fuel pump mechanical malfunction
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Check valve (two-way) malfunction integrated with fuel tank
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Fuel leakage from fuel injector
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Fuel injector clogging
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Fuel line restriction or clogging
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Pressure regulator malfunction (built-in fuel pump unit)
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Erratic signal form APP sensor
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Erratic signal form TP sensor
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Intermittent open or short circuit of MAF sensor, TP sensor, APP sensor and
VSS
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ATX malfunction
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Loose attaching bolts or worn engine mounts
WARNING:
The following troubleshooting flow chart contains the fuel system
diagnosis and repair procedures. Read the following warnings before
servicing the fuel system:
z
Fuel vapor is hazardous. It can easily ignite, causing serious injury
and damage. Always keep sparks and flames away from fuel.
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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.
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
Page 49
© 2005 Mitchell Repair Information Company, LLC.