Mazda CX-9 Grand Touring 2007 Manual page 393

2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
harness-side) and HO2S
terminal C (wiring harness-
side)
HO2S terminal A (wiring
harness-side) and HO2S
terminal D (wiring harness-
side)
HO2S terminal A (wiring
harness-side) and HO2S
terminal B (wiring harness-
side)
Are the resistances more than 10
kilohms?
6 INSPECT HO2S HEATER CIRCUIT
FOR OPEN CIRCUIT IN WIRING
HARNESS
For DTC P0053 Measure
resistance between PCM terminal
2J and front HO2S (RH) terminal
A.
For DTC P0054 Measure
resistance between PCM terminal
2AS and rear HO2S (RH) terminal
A.
For DTC P0059 Measure
resistance between PCM terminal
2E and front HO2S (LH) terminal
A.
For DTC P0060 Measure
resistance between PCM terminal
2AO and rear HO2S (LH)
terminal A.
Is the resistance less than 5.0
ohms?
7 INSPECT INTERNAL RESISTANCE
OF HO2S HEATER
Measure the resistance between
the suspect HO2S terminal A and
C on the component side.
Is the resistance between 3-30
ohms?
2007 Mazda CX-9 Grand Touring
No
Yes
No
Yes
No
Repair or replace suspected part, Go to
Step 9
Go to the next step.
Repair or replace suspected part, Go to
Step 9.
Go to the next step.
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].)