Mazda CX-9 Grand Touring 2009 Manual page 1344

STEP INSPECTION
Verify the following:
Vacuum connection
Air cleaner element
No air leakage from intake-air
system
No restriction of intake-air system
Proper sealing of intake manifold
and components attached to intake
1 manifold
Ignition wiring
Fuel quality (such as proper octane,
contamination, winter/summer
blend)
Electrical connections
Smooth operation of throttle valve
Are all items normal?
Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON position
2 (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
3 Is engine overheating?
Connect the M-MDS to the DLC-2.
Access APP1, APP2, APP3, RPM, VPWR,
MAF, TP1, TP2 and VSS PIDs.
4
Drive the vehicle with monitoring PIDs.
Are PIDs within specifications?
(See PCM INSPECTION [MZI-3.7] .)
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
RESULTS
Yes Go to the next step.
Service if necessary.
No
DTC is displayed:
Yes Go to the appropriate DTC inspection.
(See DTC TABLE [MZI-3.7] .)
No DTC is displayed:
No
Go to the next step.
Go to symptom troubleshooting "No.17
Yes
Cooling system concerns - Overheating".
No Go to the next step.
Yes Go to the next step.
APP1, APP2, APP3 PIDs:
Inspect if output signal from APP sensor
Inspect the CKP sensor and related wiring
harness for vibration or intermittent
No
Inspect for open circuit intermittently.
Inspect for open circuit of the MAF sensor
and related wiring harness intermittently.
Inspect if output signal from TP sensor
ACTION
Repeat Step 1.
changes smoothly.
RPM PID:
open/short circuit.
VPWR PID:
MAF PID:
TP1, TP2 PID:
changes smoothly.