13
Perform the purge control inspection.
(When engine can be started.)
(See
ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.5]
.)
Is the purge control correct?
Yes
Go to the next step.
No
Repair or replace the malfunctioning
part.
14
Perform compression inspection.
(see
COMPRESSION INSPECTION
[MZI-3.5]
.)
Is compression correct?
Yes
Visually inspect for deformed exhaust
system part.
No
Repair or replace the malfunctioning
part.
15
When the engine cannot be started,
inspect the intake-air system for air
leakage.
When the engine can be started,
perform intake manifold vacuum
inspection.
Is air sucked in from intake-air system?
Yes
Repair or replace the malfunctioning
part.
No
Go to the next step.
16
Install the fuel pressure gauge between
the fuel filter and the 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 fuel line pressure correct with the
ignition switch at ON?
(see
FUEL LINE PRESSURE
INSPECTION [MZI-3.5]
.)
Yes
Inspect the following PIDs:
z
ECT
z
O2S11
z
O2S12
z
O2S21
z
O2S22
z
MAF
(see
PCM INSPECTION [MZI-3.5]
.)
Inspect PCM GND condition.
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-
3.5]
.)
High:
Replace the fuel pump unit.
(see
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-
3.5]
.)
17
z
Verify test results.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:38 AM
Page 93
© 2005 Mitchell Repair Information Company, LLC.