Mazda CX-9 Grand Touring 2007 Manual page 466

2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
NOTE:
For vehicle specific fuel
pressure ranges, refer to the
"FUEL LINE PRESSURE
INSPECTION ".
Remove the jumper wire(s).
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.
Turn the ignition switch to the ON
position (Engine running).
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?
6 INSPECT FUEL INJECTOR
OPERATION
Remove fuel injector.
Inspect the injector operation.
Is the fuel injector normal?
7 INSPECT HO2S OUTPUT
VOLTAGE
Visually inspect the HO2S circuit
for exposed wiring,
contamination, corrosion and
correct assembly. Repair if
necessary.
Measure the voltage between
HO2S terminal B and D on the
component side.
2007 Mazda CX-9 Grand Touring
No
Yes
No
Yes
No
Replace the fuel pump unit.
Then go to Step 9.
Go to the next step.
Replace the fuel injector.
Then go to Step 9.
Go to the next step.
Replace the HO2S.
Then go to Step 9.