z
Remove the jumper wire(s).
z
Connect the HO2S connector.
z
Relieve the fuel pressure.
z
Connect the mechanical fuel
pressure gauge
z
Pressurize the fuel system.
z
Turn the ignition switch to the ON
position (Engine running).
z
Allow the fuel pressure to
stabilize.
z
Turn the ignition switch off.
z
Turn the ignition switch to the ON
position (Engine running).
z
Access the PCM and control the
FP PID.
z
Run the fuel pump to obtain
maximum fuel pressure.
z
Is the fuel pressure within the
range for the vehicle being
diagnosed?
NOTE:
z
For vehicle specific fuel
pressure ranges, refer to the
"FUEL LINE PRESSURE
INSPECTION ".
No
Replace the fuel pump unit.
Then go to Step 9.
6
INSPECT FUEL INJECTOR
OPERATION
z
Remove fuel injector.
z
Inspect the injector operation.
z
Is the fuel injector normal?
Yes
Go to the next step.
No
Replace the fuel injector.
Then go to Step 9.
7
INSPECT HO2S OUTPUT
VOLTAGE
z
Visually inspect the HO2S circuit
for exposed wiring,
contamination, corrosion and
correct assembly. Repair if
necessary.
z
Measure the voltage between
HO2S terminal B and D on the
component side.
Yes
Go to the next step.
No
Replace the HO2S.
Then go to Step 9.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:30 AM
Page 119
© 2005 Mitchell Repair Information Company, LLC.