Short check connector terminal F/P to
body GND using a jumper wiring.
Turn the ignition switch to the ON
position.
Is fuel line pressure correct with
ignition switch ON?
(see
FUEL LINE PRESSURE
INSPECTION [MZI-3.5]
.)
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]
.)
22
Visually inspect for fuel leakage at fuel
injector O-ring and fuel line.
Service if necessary.
Is fuel line pressure held after ignition
switch is turned off?
(see
FUEL LINE PRESSURE
INSPECTION [MZI-3.5]
.)
Yes
Go to the next step.
No
Inspect the fuel injector.
If the fuel injector is normal, replace the
fuel pump unit. (see
FUEL PUMP
UNIT REMOVAL/INSTALLATION
[MZI-3.5]
.)
23
Connect pressure gauges to A/C low
and high pressure side lines.Turn A/C
on and measure low side and high side
pressures.Are pressures within
specifications?(see
REFRIGERANT
PRESSURE CHECK
.)
NOTE:
z
The following test is for stall
concerns with the A/C on. If
other symptoms exist, go to
the next step.
Yes
Go to the next step.
No
If A/C is always on, go to symptom
troubleshooting "No.24 A/C is always on
or A/C compressor runs continuously".
(See
NO.24 A/C IS ALWAYS ON OR
A/C COMPRESSOR RUNS
CONTINUOUSLY [MZI-3.5]
.)
For other symptoms, inspect the
following:
z
Refrigerant charging amount
z
Condenser fan operation
24
Disconnect the vacuum hose between
the purge solenoid valve and the intake
manifold from purge solenoid side.
Plug opening end of vacuum hose.
Start the engine.
Is the engine stall now eliminated?
Yes
Inspect if purge solenoid valve is stuck
open.
Inspect evaporative emission control
system.
No
Go to the next step.
25
Is air leakage felt or heard at intake-air
system components while racing the
engine to higher speed?
Yes
Repair or replace the malfunctioning
part.
No
Go to the next step.
26
Inspect variable valve timing control
system operation.
(See
ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.5]
.)
Yes
Go to the next step.
No
Repair or replace the malfunctioning
parts according to variable valve timing
control system operation inspection
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:37 AM
Page 28
© 2005 Mitchell Repair Information Company, LLC.