HARNESS
z
For DTC P0135, measure the
resistance between PCM terminal
2J and front HO2S (RH) terminal
A.
z
For DTC P0141, measure the
resistance between PCM terminal
2AS and rear HO2S (RH) terminal
A.
z
For DTC P0155, measure the
resistance between PCM terminal
2E and front HO2S (LH) terminal
A.
z
For DTC P0161, measure the
resistance between PCM terminal
2AO and rear HO2S (LH) terminal
A.
z
Is the resistance less than 5.0
ohms?
No
Repair or replace suspected part, Go to
Step 12.
9
INSPECT INTERNAL RESISTANCE
OF HO2S HEATER
z
Measure the resistance between
the suspect HO2S terminal A and
C, on the component side.
z
Is the resistance between 3-30
ohms?
Yes
Go to the next step.
No
Replace HO2S.
(see
FRONT HEATED OXYGEN
SENSOR (HO2S)
REMOVAL/INSTALLATION [MZI-
3.5].
)
(see
REAR HEATED OXYGEN
SENSOR (HO2S)
REMOVAL/INSTALLATION [MZI-
3.5].
)
Go to Step 12.
10
INSPECT HO2S CASE FOR SHORT
TO POWER SUPPLY, HTR, AND
SIGNRTN
z
Measure the resistance between
the suspect HO2S terminal A and
D at component side.
z
Measure the resistance between
the suspect HO2S terminal A and
body ground.
z
Is the resistance more than 10
kilohms?
Yes
Go to the next step.
No
Replace HO2S.
(see
FRONT HEATED OXYGEN
SENSOR (HO2S)
REMOVAL/INSTALLATION [MZI-
3.5].
)
(see
REAR HEATED OXYGEN
SENSOR (HO2S) INSPECTION [MZI-
3.5].
)
Go to the next step.
11
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 103
© 2005 Mitchell Repair Information Company, LLC.