Mazda CX-9 Grand Touring 2007 Manual page 435

2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Turn the ignition switch off.
Turn the ignition switch to the ON
position (Engine off).
Access the PCM and monitor the
HO2S signal PID.
Perform a thorough wiggle test on
the HO2S wiring harness.
Does the voltage change during
the wiggle test?
6 INSPECT HO2S CIRCUIT FOR
SHORT TO POWER SUPPLY IN
WIRING HARNESS
Turn the ignition switch off.
Disconnect the PCM connector.
Turn the ignition switch to the ON
position (Engine off).
Measure the voltage between
HO2S terminal B and body
ground.
Is any voltage present?
7 INSPECT HO2S
For DTC P0132 Inspect the front
HO2S(RH)
For DTC P0138 Inspect the rear
HO2S(RH)
For DTC P0152 Inspect the front
HO2S(LH)
For DTC P0138 Inspect the rear
HO2S(LH)
(see FRONT HEATED
OXYGEN SENSOR (HO2S)
INSPECTION [MZI-3.5]. )
(see REAR HEATED OXYGEN
SENSOR (HO2S) INSPECTION
[MZI-3.5]. )
Is there any malfunction?
8 INSPECT FOR CORRECT PCM
OPERATION
2007 Mazda CX-9 Grand Touring
No
Yes
No
Yes
No
Yes
Perform the "INTERMITTENT
CONCERN TROUBLESHOOTING".
Then go to the next step.
Repair or replace suspected part, Then go
to the next step.
Go to Step 9.
Replace the HO2S.
(see FRONT HEATED OXYGEN
SENSOR (HO2S)
REMOVAL/INSTALLATION [MZI-
3.5]. )
(see REAR HEATED OXYGEN
SENSOR (HO2S)
REMOVAL/INSTALLATION [MZI-
3.5]. )
Then go to the next step.
Go to the next step.
Go to the next step.