Mazda CX-9 Grand Touring 2007 Manual page 872

2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
STEP INSPECTION
1 Verify the following:
Vacuum connection
Restriction in intake-air system
(such as air cleaner element,
fresh air duct)
No air leakage from intake-air
system
No restriction of intake-air
system
Proper sealing of intake
manifold and components
attached to intake manifold
Fuel quality (such as proper
octane, contamination,
winter/summer blend)
Are all items normal?
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?
3 Is the engine overheating?
4 Connect the M-MDS to the DLC-2.
Access APP1, APP2, APP3, RPM,
MAF, TP1, TP2, IAT and VSS PIDs.
Drive vehicle while monitoring PIDs.
Are PIDs within specifications?
(see PCM INSPECTION [MZI-
3.5] .)
2007 Mazda CX-9 Grand Touring
disconnecting/connecting, and make sure that it is free of foreign
material.
RESULTS ACTION
Yes
No
Yes
No
Yes
No
Yes
No
Go to the next step.
Service if necessary.
Repeat Step 1.
DTC is displayed:
Go to the appropriate DTC inspection.
(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".
Go to the next step.
Go to the next step.
APP1, APP2, APP3 PIDs:
Inspect if output signal accelerator pedal
position sensor changes smoothly.
RPM PID:
Inspect CKP sensor and related wiring
harness for vibration or intermittent
open/short circuit or both.
MAF PID:
Inspect for intermittent open circuit of