Mazda CX-9 Grand Touring 2007 Manual page 867

2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
STEP INSPECTION
1 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 manifold
Ignition wiring
Fuel quality (such as proper
octane, contamination,
winter/summer blend)
Electrical connections
Smooth operation of throttle
valve
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 engine overheating?
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] .)
2007 Mazda CX-9 Grand Touring
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 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.