POSSIBLE CAUSE
z
Erratic signal to ignition coil
z
Vacuum leakage
z
Poor fuel quality
z
Starting system malfunction
z
Spark plug malfunction
z
Air leakage from intake-air system
z
Erratic signal from CKP sensor
z
Erratic signal from CMP sensor
z
Improper air/fuel mixture ratio control
z
Air cleaner restriction
z
Improper operation of electronic throttle control system
z
PCV valve malfunction
z
Inadequate fuel pressure
z
Purge solenoid valve malfunction
z
MAF sensor contamination
z
Incorrect MAF sensor GND voltage
z
Restriction in exhaust system
z
Pressure regulator malfunction (built-in fuel pump unit)
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.
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:
z
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 9:27:36 AM
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© 2005 Mitchell Repair Information Company, LLC.