Mazda CX-9 Grand Touring 2007 Manual page 858

2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
4 Is the engine overheating?
5 Connect the M-MDS to the DLC-2.
Access MAF PID.
Drive vehicle with monitoring PID.
Is MAF PID within specification?
6
NOTE:
The following test is for engine
running at rough idle with A/C
on. If other symptoms exist, go
to the next step.
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 .)
7
NOTE:
The following test is for engine
running rough with P/S on. If
other symptoms exist, go to
the next step.
Connect the M-MDS to the DLC-
2.Start the engine and idle it.Access
PSP PID.Is PSP PID within
specification?
8 Visually inspect the CKP sensor and
teeth of crankshaft pulley.
Are the CKP sensor and teeth of
crankshaft pulley normal?
9 Inspect the ignition coil related wiring
harness condition (intermittent open or
short circuit) for all cylinders. Are
wiring harness conditions normal?
2007 Mazda CX-9 Grand Touring
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
(see DTC TABLE [MZI-3.5] .)
No DTC is displayed:
Go to the next step.
Go to symptom troubleshooting "No.17
Cooling system concerns -
Overheating".
(See NO.17 COOLING SYSTEM
CONCERNS-OVERHEATING
[MZI-3.5].)
Go to the next step.
Go to the next step.
Inspect for open or short circuit of MAF
sensor and related wiring harness.
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-3.5].)
For other symptoms, inspect the
following:
Refrigerant charging amount
Condenser fan operation
Go to the next step.
Inspect power steering pressure switch
operation and wiring harness between
P/S pressure switch and PCM terminal
2I.
Go to the next step.
Replace the malfunctioning part.
Go to the next step.
Repair the wiring harnesses.