9
INSPECT FUEL LINE FROM FUEL PUMP
TO FUEL DELIVERY PIPE
z
Visually inspect fuel line for any leakage.
z
Is fuel leakage found?
Yes
Replace suspected fuel line. Then go to
Step 13.
No
Inspect the low-pressure side fuel filter
for the following:
z
Foreign materials or stain inside
fuel filter. Perform the following
actions as a result.
z
If foreign material or staining is
found inside the fuel filter (low-
pressure side), clean the fuel tank
and filter.
z
If normal, replace fuel pump unit.
Then go to Step 13.
10
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
13.
11
INSPECT FRONT 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.
z
Increase the engine speed to 2,000 rpm for 3
min.
z
Turn the ignition switch to the ON position
(Engine running)
z
Monitor the signal voltage.
z
Is the voltage more than 0.5 V at any time
during the engine running?
Yes Go to the next step.
No Replace the HO2S. Then go to Step 13.
12
PERFORM THOROUGH WIGGLE TEST ON
HO2S WIRING HARNESS
z
Turn the ignition switch off.
z
Connect the HO2S connector.
z
Turn the ignition switch to the ON position
(Engine running)
z
Verify that the engine is at normal operating
Yes Isolate the concern and repair if
necessary. Then go to the next step.
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:35 AM
Page 111
© 2005 Mitchell Repair Information Company, LLC.
