Mazda CX-9 Grand Touring 2007 Manual page 455

2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
When the fuel pump is
commanded off, the fuel
pressure may substantially
decrease and then stabilize.
NOTE:
During output state control, the
fuel pump stays commanded on
for only approx. 5 s.
Connect the mechanical fuel
pressure gauge.
Turn the ignition switch to the ON
position (Engine off).
Access the PCM and control the
FP PID.
Run the fuel pump to obtain
maximum fuel pressure.
Command the fuel pump off.
Allow the fuel pressure to
stabilize.
Record the stabilized reading.
Monitor the fuel pressure for 1
min.
Does the fuel pressure remain
within 34 kPa {255 mmHg, 10.0
inHg} of the recorded reading
after 1 min?
9 INSPECT FUEL INJECTOR
OPERATION
Remove the fuel injector.
Inspect the fuel injector operation.
Is the fuel injector normal?
10 INSPECT FUEL SUPPLY LINE FOR
RESTRICTION
NOTE:
Observe the Warnings,
Cautions, and Notes.
Disconnect the fuel supply line at
the fuel rail.
2007 Mazda CX-9 Grand Touring
No
Yes
No
Yes
Go to the next step.
Go to the next step.
Replace the fuel injector, then go to Step
11.
Replace the fuel pump module. Then go to
the next step.