Mazda CX-9 Grand Touring 2007 Manual page 462

2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Connect the HO2S connector.
Relieve the fuel pressure.
Connect the mechanical fuel
pressure gauge.
Pressurize the fuel system.
Turn the ignition switch to the ON
position (Engine running).
Allow the fuel pressure to
stabilize.
Turn the ignition switch off.
Access the PCM and control the
FP PID.
Run the fuel pump to obtain
maximum fuel pressure.
Is the fuel pressure within the
range for the vehicle being
diagnosed?
9 INSPECT FUEL LINE FROM FUEL
PUMP TO FUEL DELIVERY PIPE
Visually inspect fuel line for any
leakage.
Is fuel leakage found?
10 INSPECT FUEL INJECTOR
OPERATION
Remove fuel injector.
Inspect the injector operation.
Is the fuel injector normal?
11 INSPECT FRONT HO2S OUTPUT
VOLTAGE
Visually inspect the HO2S circuit
2007 Mazda CX-9 Grand Touring
No
Yes
No
Yes
No
Yes
Go to the next step.
Replace suspected fuel line. Then go to
Step 13.
Inspect the low-pressure side fuel filter for
the following:
Foreign materials or stain inside fuel
filter. Perform the following actions
as a result.
If foreign material or staining is
found inside the fuel filter (low-
pressure side), clean the fuel tank
and filter.
If normal, replace fuel pump unit.
Then go to Step 13.
Go to the next step.
Replace the fuel injector, then go to Step
13.
Go to the next step.