Mazda CX-9 Grand Touring 2009 Manual page 1385

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
INSPECTION [MZI-
3.7] .)
Are all above items normal?
Is the air cleaner element free of
9
clogging?
Perform the spark test.
(See ENGINE CONTROL
SYSTEM OPERATION
10
INSPECTION [MZI-3.7].)
Is strong blue spark visible at each
cylinder?
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.
11
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] .)
Inspect the following PIDs:
ECT
O2S11 (When engine can be
started.)
O2S12 (When engine can be
started.)
O2S21 (When engine can be
12
started.)
O2S22 (When engine can be
started.)
MAF
(See PCM INSPECTION [MZI-
3.7] .)
Are PIDs normal?
Perform the purge control
inspection.
(When engine can be started.)
2008 Mazda CX-9 Grand Touring
For No.4 cylinder: 2BH
For No.5 cylinder: 2BB
For No.6 cylinder: 2BD
No
Yes Go to the next step.
No
Yes Go to the next step.
No Repair or replace the malfunctioning part.
Yes Go to the next step.
Inspect the fuel pump relay and fuel pump circuit.
If there is no malfunction, replace the fuel pump
No
REMOVAL/INSTALLATION [MZI-3.7] .)
REMOVAL/INSTALLATION [MZI-3.7] .)
Yes Go to the next step.
No Repair or replace the malfunctioning part.
Yes Go to the next step.
Replace the fuel injector.
Replace the air cleaner element.
Zero or low:
Inspect the fuel line for clogging.
unit.
(See FUEL PUMP UNIT
High:
Replace the fuel pump unit.
(See FUEL PUMP UNIT