Mazda CX-9 Grand Touring 2009 Manual page 911

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Is the resistance more than 10
kilohms?
INSPECT HO2S HEATER FOR
SHORT IN WIRING HARNESS
Measure the resistance between the
following terminals:
HO2S terminal A (wiring
harness-side) and HO2S
terminal C (wiring harness-
side)
5 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?
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
6
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?
INSPECT INTERNAL RESISTANCE
OF HO2S HEATER
7
Measure the resistance between the
suspect HO2S terminal A and C on
the component side.
2008 Mazda CX-9 Grand Touring
Yes Go to the next step.
No Repair or replace suspected part, Go to Step 9
Yes Go to the next step.
No Repair or replace suspected part, Go to Step 9.
Yes Go to the next step.
(See FRONT HEATED OXYGEN SENSOR
No
(HO2S) REMOVAL/INSTALLATION [MZI-
(See REAR HEATED OXYGEN SENSOR
Replace the HO2S.
3.7] .)