Mazda CX-9 Grand Touring 2007 Manual page 871

2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
POSSIBLE CAUSE
2007 Mazda CX-9 Grand Touring
Vacuum leakage
Poor fuel quality
Erratic signal to ignition coil
Engine overheating
Throttle body malfunction
Spark plug malfunction
PCV valve malfunction
Improper valve timing due to jumping out of timing chain
Improper variable valve timing control operation
Restriction in exhaust system
Intermittent open or short in fuel pump related circuit
Inadequate fuel pressure Fuel pump mechanical malfunction
Fuel line restriction or clogging
Fuel leakage from fuel injector
Fuel injector clogging
Erratic signal from accelerator pedal position sensor
Erratic signal from TP sensor
Intermittent open or short circuit in MAF sensor, Accelerator pedal position
sensor, TP sensor, IAT sensor and VSS
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:
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 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:
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