z
Ignition wiring
z
Electrical connections
z
Fuses
z
Smooth operation of throttle valve
z
PCM GND circuit (1D, U, 1BP,
1BK)
Are all items normal?
No
Service if necessary.
Repeat Step 2.
3
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.
4
Is the engine overheating?
Yes
Go to symptom troubleshooting "No.17
Cooling system concerns - Overheating".
(See
NO.17 COOLING SYSTEM
CONCERNS-OVERHEATING [MZI-
3.7]
.)
No
Go to the next step.
5
Connect the M-MDS to the DLC-2.
Access MAF PID.
Drive vehicle with monitoring PID. Is
MAF PID within specification?
Yes
Go to the next step.
No
Inspect for open or short circuit of MAF
sensor and related wiring harness.
6
Connect pressure gauge to A/C low and
high pressure side lines.Start engine and
idle it.Turn the A/C switch on.Measure low
side and high side pressures.Are pressures
within specifications?(See
REFRIGERANT PRESSURE
CHECK
.)
NOTE:
z
The following test is for engine
running at rough idle with A/C on.
If other symptoms exist, go to the
next step.
Yes
Go to the next step.
No
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:
z
Refrigerant charging amount
z
Condenser fan operation
7
Connect the M-MDS to the DLC-2.Start
NOTE:
z
The following test is for engine
running rough with P/S on. If other
symptoms exist, go to the next
step.
Yes
Go to the next step.
No
Inspect power steering pressure switch
operation and wiring harness between P/S
pressure switch and PCM terminal 21.
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 44
© 2005 Mitchell Repair Information Company, LLC.
