1
z
Collapsed or restricted radiator
hoses
z
Radiator pressure cap
z
Overflow system
z
Fan rotational direction
z
Fuses
Are all items normal?
No
Service if necessary.
Repeat Step 1.
2
Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON
position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
Go to the appropriate DTC inspection.
(See
DTC TABLE [MZI-3.7]
.)
No
No DTC is displayed:
Go to the next step.
3
Start the engine and idle it.
Turn the A/C switch on and set blower fan
to any speed.
Does the A/C compressor engage?
Yes
Go to Step 5.
No
Inspect for the following and repair or
replace if necessary:
z
Refrigerant charging amount
z
Open circuit in wiring harness
between A/C relay and PCM
terminal 1N
z
Seized A/C magnetic clutch
z
A/C magnetic clutch malfunction
If all items are normal, go to the next step.
4
Connect the M-MDS to the DLC-2.
Access AC_REQ PID.
Start the engine and idle it.
Turn the A/C switch and fan switch on.
Does AC_REQ PID read on?
Yes
Go to the next step.
No
Inspect the following:
z
Refrigerant pressure switch
operation
z
The A/C switch is stuck open.
z
Open or short circuit between
refrigerant pressure switch and PCM
terminal 1R
z
Open circuit of blower motor fan
switch and resistor (if blower motor
does not operate)
z
The evaporator temperature sensor
and A/C amplifier
Inspect cooling fan control system
operation.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:05 AM
Page 71
© 2005 Mitchell Repair Information Company, LLC.
