INSPECTION [MZI-
3.7]
.)
Are all above items normal?
z
For No.4 cylinder: 2BH
z
For No.5 cylinder: 2BB
z
For No.6 cylinder: 2BD
No
Replace the fuel injector.
9
Is the air cleaner element free of
clogging?
Yes
Go to the next step.
No
Replace the air cleaner element.
10
Perform the spark test.
(See
ENGINE CONTROL
SYSTEM OPERATION
INSPECTION [MZI-3.7]
.)
Is strong blue spark visible at each
cylinder?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part.
11
Install the fuel pressure gauge
between the fuel filter and fuel
distributor.
Short check connector terminal
F/P to body GND using a jumper
wiring.
Turn the ignition switch to the ON
position (Engine off).
Is the fuel line pressure correct
with ignition switch at ON?
(See
FUEL LINE PRESSURE
INSPECTION [MZI-3.7]
.)
Yes
Go to the next step.
No
Zero or low:
Inspect the fuel pump relay and fuel pump circuit.
Inspect the fuel line for clogging.
If there is no malfunction, replace the fuel pump
unit.
(See
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-3.7]
.)
High:
Replace the fuel pump unit.
(See
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-3.7]
.)
12
Inspect the following PIDs:
z
ECT
z
O2S11 (When engine can be
started.)
z
O2S12 (When engine can be
started.)
z
O2S21 (When engine can be
started.)
z
O2S22 (When engine can be
started.)
z
MAF
(See
PCM INSPECTION [MZI-
3.7]
.)
Are PIDs normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part.
Perform the purge control
inspection.
(When engine can be started.)
Yes
Go to the next step.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:06 AM
Page 94
© 2005 Mitchell Repair Information Company, LLC.
