Mazda CX-9 Grand Touring 2009 Manual page 1313

POSSIBLE
CAUSE
DIAGNOSTIC PROCEDURE
NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK (MZI-3.7)
DIAGNOSTIC PROCEDURE
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Spark plug malfunction
Air leakage from intake-air system
Erratic signal from CKP sensor
Erratic signal from CMP sensor
Improper air/fuel mixture ratio control
Air cleaner restriction
Improper operation of electronic throttle control system
PCV valve malfunction
Inadequate fuel pressure
Purge solenoid valve malfunction
MAF sensor contamination
Incorrect MAF sensor GND voltage
Restriction in exhaust system
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:
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 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:
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.