11
INSPECT FUEL LINE PRESSURE
z
Turn the ignition switch off.
z
Inspect the fuel line pressure. (See
FUEL LINE PRESSURE
INSPECTION [MZI-3.7]
.)
z
Is there any malfunction?
Yes
step. If the fuel line pressure is excessively high,
check as follows:
z
Fuel pump maximum pressure
z
Fuel return line for clogging
{
If all of the above are normal, replace
the pressure regulator. (See
PRESSURE REGULATOR
INSPECTION [MZI-3.7]
.)
Then go to Step 18.
No
Go to Step 18.
12
INSPECT FUEL LINE FROM FUEL
PUMP TO FUEL DELIVERY PIPE
z
Visually inspect the fuel line for any
leakage.
z
Is any fuel leakage found?
Yes Replace suspected fuel line, then go to Step 18.
No
Inspect the low-pressure side fuel filter for the
following:
z
Foreign material or staining inside the 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 the fuel pump unit. (See
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-
3.7]
.)
Then, go to Step 18.
13
INSPECT ENGINE COMPRESSION
z
Inspect the engine compression. (See
COMPRESSION INSPECTION
[MZI-3.7]
.)
z
Is it normal?
Yes Go to the next step.
No
Perform an engine overhaul for repairs, then go to
Step 18.
14
INSPECT VARIABLE VALVE
TIMING CONTROL SYSTEM
OPERATION
z
Inspect the variable valve timing
control system operation. (See
Yes 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 10:08:36 AM
Page 154
© 2005 Mitchell Repair Information Company, LLC.
