Mazda CX-9 Grand Touring 2009 Manual page 1018

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
INSPECT FUEL LINE PRESSURE
Turn the ignition switch off.
11 Inspect the fuel line pressure. (See
FUEL LINE PRESSURE
INSPECTION [MZI-3.7] .)
Is there any malfunction?
INSPECT FUEL LINE FROM FUEL
PUMP TO FUEL DELIVERY PIPE
12
Visually inspect the fuel line for any
leakage.
Is any fuel leakage found?
INSPECT ENGINE COMPRESSION
Inspect the engine compression. (See
13
COMPRESSION INSPECTION
[MZI-3.7] .)
Is it normal?
INSPECT VARIABLE VALVE
TIMING CONTROL SYSTEM
OPERATION
14
Inspect the variable valve timing
control system operation. (See
2008 Mazda CX-9 Grand Touring
step. If the fuel line pressure is excessively high,
check as follows:
Yes
Then go to Step 18.
No
Yes Replace suspected fuel line, then go to Step 18.
Inspect the low-pressure side fuel filter for the
Perform the following actions as a result:
No
Yes Go to the next step.
Perform an engine overhaul for repairs, then go to
No
Yes Go to the next step.
Fuel pump maximum pressure
Fuel return line for clogging
If all of the above are normal, replace
the pressure regulator. (See
PRESSURE REGULATOR
INSPECTION [MZI-3.7] .)
Go to Step 18.
following:
Foreign material or staining inside the fuel
filter
If foreign material or staining is found
inside the fuel filter (low-pressure side),
clean the fuel tank and filter.
If normal, replace the fuel pump unit. (See
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-
3.7] .)
Then, go to Step 18.
Step 18.