Mazda CX-9 Grand Touring 2009 Manual page 1346

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
switch is turned off?
(See FUEL LINE PRESSURE
INSPECTION [MZI-3.7] .)
NOTE:
The following test is for engine
stall with the A/C on. If other
symptom exists, go to the next
step.
12
Connect a pressure gauge to A/C low and
high pressure side lines.Turn the A/C on
and measure low side and high side
pressure.Are pressures within
specifications?(See REFRIGERANT
PRESSURE CHECK .)
NOTE:
The following test should be
performed for symptom with
cruise control ON. If other
13
symptoms exist, go to the next
step.
Inspect cruise control system.Is cruise
control system normal?
Inspect the front HO2S.
(See FRONT HEATED OXYGEN
14 SENSOR (HO2S) INSPECTION [MZI-
3.7] .)
Is the front HO2S normal?
Inspect the evaporative purge hose between
the fuel tank and the purge valve.
15
Does fuel flow into evaporative purge
hose?
Disconnect the vacuum hose between the
purge solenoid valve and the intake
manifold from the purge solenoid valve
16 side.
Plug opening end of vacuum hose.
Drive the vehicle.
Does the engine condition improve?
Visually inspect the CMP sensor and
projections of camshaft pulley.
17
Are CMP sensor and projections of
camshaft pulley normal?
2008 Mazda CX-9 Grand Touring
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-
3.7] .)
Go to the next step.
If the 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-3.7].)
For other symptoms, inspect the
following:
Refrigerant charging amount
Condenser fan operation
Go to the next step.
Repair or replace the malfunctioning part.
Go to the next step.
Replace the front HO2S.
(See REAR HEATED OXYGEN
SENSOR (HO2S)
REMOVAL/INSTALLATION [MZI-
3.7] .)
Inspect the check valve (two-way).
(See FUEL TANK INSPECTION [MZI-
3.7] .)
Go to the next step.
Go to the next step.
Inspect if the purge solenoid valve is stuck
open mechanically.
Inspect the evaporative emission control
system.
Go to the next step.
Go to the next step.
Replace the malfunctioning part.