z
Is the resistance less than 5 ohms?
13
INSPECT INTERNAL
RESISTANCE OF HO2S HEATER
z
Measure the resistance between
the suspect HO2S terminal A and
C at component side.
z
Is the resistance between 3-30
ohms?
Yes
Go to the next step.
No
Install a new HO2S. Then go to Step 17.
14
INSPECT HO2S HEATER CIRCUIT
FOR INTERNAL SHORT TO
SIGRTN OR GROUND
z
Measure the resistance between:
{
HO2S terminal A and D at
component side
{
HO2S terminal A at
component side and battery
negative terminal
z
Is the resistance more than 10
kilohms?
Yes
Go to the next step.
No
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 Step 17.
15
INSPECT HO2S
z
For DTC P0133 Inspect the front
HO2S(RH)
z
For DTC P0139 Inspect the rear
HO2S(RH)
z
For DTC P0153 Inspect the front
HO2S(LH)
z
For DTC P0159 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 Step 17.
No
Go to the next step.
16
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 97
© 2005 Mitchell Repair Information Company, LLC.