DIAGNOSTIC PROCEDURE
POSSIBLE
CAUSE
z
Throttle body malfunction
z
Spark plug malfunction
z
PCV valve malfunction
z
Improper valve timing due to jumping out of timing chain
z
Improper variable valve timing control operation
z
Restriction in exhaust system
z
Intermittent open or short in fuel pump related circuit
z
Inadequate fuel pressure
z
Fuel pump mechanical malfunction
z
Fuel line restriction or clogging
z
Fuel leakage from fuel injector
z
Fuel injector clogging
z
Erratic signal from accelerator pedal position sensor
z
Erratic signal from TP sensor
z
Intermittent open or short circuit in MAF sensor, Accelerator pedal position
sensor, TP sensor, IAT sensor and VSS
z
ATX malfunction
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 SERVICE
PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this
manual.
(See BEFORE SERVICE PRECAUTION [MZI-3.7] .)
(See AFTER SERVICE PRECAUTION [MZI-3.7] .)
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.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:05 AM
Page 57
© 2005 Mitchell Repair Information Company, LLC.
