Mazda CX-9 Grand Touring 2009 Manual page 1341

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
OPERATION INSPECTION [MZI-
3.7].)
5
Does the electronic throttle control
system function properly?
Disconnect the vacuum hose between the
purge solenoid valve and the intake
manifold from purge solenoid valve side.
6
Plug opening end of vacuum hose.
Drive the vehicle.
Does the engine condition improve?
Connect the M-MDS to the DLC-2.
Access APP1, APP2, APP3, TP1, TP2,
MAF and VSS PIDs.
7
Monitor each PID while driving vehicle.
(See PCM INSPECTION [MZI-3.7] .)
Are PIDs normal?
Access and monitor BOO, TR PIDs.
8 Are PIDs values normal?
(See PCM INSPECTION [MZI-3.7] .)
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.
(See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].)
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
9
Information and perform repair or diagnosis.
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information is not available,
replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
2008 Mazda CX-9 Grand Touring
No
Inspect the evaporative emission control
Yes
system.
No
Yes Go to the next step.
Inspect the accelerator pedal position sensor.
No
Yes Go to the next step.
No
Repair or replace the malfunctioning part
according to electronic throttle control
system operation inspection results.
Go to the next step.
APP1, APP2, APP3 PIDs:
TP1, TP2 PID:
Inspect TP sensor.
MAF PID:
Inspect MAF sensor.
VSS PID:
Inspect VSS.
If the BOO PID is not normal:
Inspect brake switch, and related
wiring harness for vibration or
intermittent open/short circuit.
If the TR PID is not normal:
Inspect TR switch and related wiring
harness for vibration or intermittent
open/short circuit.