Mazda CX-9 Grand Touring 2009 Manual page 1362

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