z
Check the throttle plate for obstructions or
sludge.
z
Check the air filter element and housing for
blockage.
z
Is a concern present?
No
Go to the next step.
5
INSPECT FUEL PRESSURE
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?
WARNING:
z
Fuel line spills and leakage are dangerous.
Fuel can ignite and cause serious injuries
or death. Fuel can also irritate skin and
eyes. To prevent this, always complete the
"BEFORE REPAIR PROCEDURE".
NOTE:
z
For vehicle specific fuel pressure ranges,
refer to the "FUEL LINE PRESSURE
INSPECTION ".
Yes Go to the next step.
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.
INSPECT HO2S OUTPUT VOLTAGE
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:36 AM
Page 114
© 2005 Mitchell Repair Information Company, LLC.
