Mazda CX-9 Grand Touring 2007 Manual page 864

2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
3.5].)
Does the electronic throttle control
system function properly?
6 Disconnect the vacuum hose between
the purge solenoid valve and the intake
manifold from purge solenoid valve
side.
Plug opening end of vacuum hose.
Drive the vehicle.
Does the engine condition improve?
7 Connect the M-MDS to the DLC-2.
Access APP1, APP2, APP3, TP1, TP2,
MAF and VSS PIDs.
Monitor each PID while driving
vehicle.
(see PCM INSPECTION [MZI-3.5] .)
Are PIDs normal?
8 Access and monitor BOO, TR PIDs.
Are PIDs values normal?
(see PCM INSPECTION [MZI-3.5] .)
9
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING [MZI-3.5].)
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
2007 Mazda CX-9 Grand Touring
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information is not
available, replace the PCM.
results.
Yes Inspect the evaporative emission
control system.
No Go to the next step.
Yes Go to the next step.
No APP1, APP2, APP3 PIDs:
Inspect the accelerator pedal position
sensor.
TP1, TP2 PID:
Inspect TP sensor.
MAF PID:
Inspect MAF sensor.
VSS PID:
Inspect VSS.
Yes Go to the next step.
No 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.