position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
(see
DTC TABLE [MZI-3.5]
.)
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-3.5]
.)
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-3.5]
.)
For other symptoms, inspect the
following:
z
Refrigerant charging amount
z
Condenser fan operation
7
Connect the M-MDS to the DLC-
2.Start the engine and idle it.Access
PSP PID.Is PSP PID within
specification?
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
2I.
8
Visually inspect the CKP sensor and
teeth of crankshaft pulley.
Are the CKP sensor and teeth of
crankshaft pulley normal?
Yes
Go to the next step.
No
Replace the malfunctioning part.
9
Inspect the ignition coil related wiring
harness condition (intermittent open or
short circuit) for all cylinders. Are
wiring harness conditions normal?
Yes
Go to the next step.
No
Repair the wiring harnesses.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:37 AM
Page 41
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