STEP INSPECTION
RESULTS ACTION
1
Verify the following:
z
Vacuum connection
z
Air cleaner element
z
No air leakage from intake-air
system
z
No restriction of intake-air
system
z
Proper sealing of intake
manifold and components
attached to intake manifold
z
Ignition wiring
z
Fuel quality (such as proper
octane, contamination,
winter/summer blend)
z
Electrical connections
z
Smooth operation of throttle
valve
Are all items normal?
Yes
Go to the next step.
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-3.5]
.)
No
No DTC is displayed:
Go to the next step.
3
Is engine overheating?
Yes
Go to symptom troubleshooting "No. 17
Cooling system concerns - Overheating".
No
Go to the next step.
4
Connect the M-MDS to the DLC-2.
Access APP1, APP2, APP3, RPM,
VPWR, MAF, TP1, TP2 and VSS
PIDs.
Drive the vehicle with monitoring
PIDs.
Are PIDs within specifications?
(see
PCM INSPECTION [MZI-
3.5]
.)
Yes
Go to the next step.
No
APP1, APP2, APP3 PIDs:
Inspect if output signal from APP sensor
changes smoothly.
RPM PID:
Inspect the CKP sensor and related
wiring harness for vibration or
intermittent open/short circuit.
VPWR PID:
Inspect for open circuit intermittently.
MAF PID:
Inspect for open circuit of the MAF
sensor and related wiring harness
intermittently.
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
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