Mazda CX-9 Grand Touring 2009 Manual page 1349

NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP INSPECTION
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
1
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?
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 the engine overheating?
Connect the M-MDS to the DLC-2.
Access APP1, APP2, APP3, RPM, MAF,
TP1, TP2, IAT and VSS PIDs.
4
Drive vehicle while 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 accelerator pedal
position sensor changes smoothly.
Inspect CKP sensor and related wiring
harness for vibration or intermittent
open/short circuit or both.
Inspect for intermittent open circuit of
No
MAF sensor and related wiring harness.
Inspect if output signal TP sensor changes
Inspect for air suction in intake-air
If normal, inspect intermittent short circuit
of IAT sensor and related wiring
ACTION
Repeat Step 1.
RPM PID:
MAF PID:
TP1, TP2 PID:
smoothly.
IAT PID:
system.
harnesses.