z
Turn the ignition switch off.
z
Turn the ignition switch to the ON
position (Engine off).
z
Access the PCM and monitor the
HO2S signal PID.
z
Perform a thorough wiggle test on
the HO2S wiring harness.
z
Does the voltage change during
the wiggle test?
No
Perform the "INTERMITTENT
CONCERN TROUBLESHOOTING".
Then go to the next step.
6
INSPECT HO2S CIRCUIT FOR
SHORT TO POWER SUPPLY IN
WIRING HARNESS
z
Turn the ignition switch off.
z
Disconnect the PCM connector.
z
Turn the ignition switch to the ON
position (Engine off).
z
Measure the voltage between
HO2S terminal B and body
ground.
z
Is any voltage present?
Yes
Repair or replace suspected part, Then go
to the next step.
No
Go to Step 9.
7
INSPECT HO2S
z
For DTC P0132 Inspect the front
HO2S(RH)
z
For DTC P0138 Inspect the rear
HO2S(RH)
z
For DTC P0152 Inspect the front
HO2S(LH)
z
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].
)
z
Is there any malfunction?
Yes
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.
No
Go to the next step.
8
INSPECT FOR CORRECT PCM
OPERATION
Yes
Go to the next step.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:30 AM
Page 88
© 2005 Mitchell Repair Information Company, LLC.