5
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-3.7]
.)
(See
REAR HEATED OXYGEN
SENSOR (HO2S) INSPECTION
[MZI-3.7]
.)
z
Is there any malfunction?
Yes
Replace the HO2S.
(See
FRONT HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION [MZI-
3.7]
.)
(See
REAR HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION [MZI-
3.7]
.)
Then go to the next step.
No
Go to the next step.
8
INSPECT FOR CORRECT PCM
OPERATION
z
Disconnect all the PCM connectors.
z
Visually inspect for:
Yes Go to the next step.
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:35 AM
Page 86
© 2005 Mitchell Repair Information Company, LLC.