system device connected to the fuel rail.
z
Inspect for the presence of fuel in the
vacuum line of each device connected
to the fuel rail.
z
Are all vacuum lines for system related
devices indicating no fuel present?
5
INSPECT FUEL PRESSURE
z
Turn the ignition switch off.
z
Relieve the fuel pressure. Refer to the .
z
Connect the mechanical fuel pressure
gauge.
z
Turn the ignition switch to the ON
position (Engine off)
z
Pressurize the fuel system. Refer to the
for the Fuel System Pressure Release
procedure to pressurize the fuel system.
z
Compare the fuel pressure reading to
the Fuel System Specification Chart.
z
Is the fuel pressure within range?
Yes Go to Step 9.
No
Go to the next step.
6
INSPECT FUEL PUMP GROUND
CIRCUIT FOR OPEN CIRCUIT IN
WIRING HARNESS
z
Disconnect the fuel pump connector.
z
Measure the resistance between fuel
pump connector terminal D (wiring
harness-side) and body ground.
z
Is the voltage less than 0.5 ohm?
NOTE:
z
Refer to the for schematic and
connector information.
Yes Go to the next step.
No
Repair or replace suspected part, Then go to
Step 11.
7
INSPECT FUEL PUMP POWER SUPPLY
CIRCUIT FOR OPEN CIRCUIT IN
WIRING HARNESS
z
Disconnect the fuel pump connector.
z
Turn the ignition switch to the ON
position (Engine off)
z
Access the PCM and control the FP
PID.
Yes Go to the next step.
Repair or replace suspected part, Then go to
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
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