Mazda CX-9 Grand Touring 2009 Manual page 908

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
HO2S wiring harness connector (s) for any
indication of crossed wires (Also, stretched
or incorrectly mounted wiring harnesses).
Are there crossed connections or wires?
VERIFY TROUBLESHOOTING OF DTC
P0040, P0041 HAS BEEN COMPLETED
Verify that all disconnected connectors
reconnected.
Turn the ignition switch to the ON position
(Engine off).
4
Clear the DTC from the PCM memory
using the M-MDS.
Start the engine and run it at idle.
Retrieve DTCs using the M-MDS.
Is the PENDING CODE for this DTC
present?
VERIFY AFTER REPAIR PROCEDURE
Perform "AFTER REPAIR
PROCEDURE".
5
(See AFTER REPAIR PROCEDURE
[MZI-3.7].)
Are any DTC present?
DTC P0053, P0054, P0059, P0060 [MZI-3.7]
DTC P0053, P0054, P0059, P0060 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0053
DTC P0054
DTC P0059
DTC P0060
DETECTION
CONDITION
POSSIBLE CAUSE
2008 Mazda CX-9 Grand Touring
P0053: Front HO2S (RH) heater resistance
P0054: Rear HO2S (RH) heater resistance
P0059: Front HO2S (LH) heater resistance
P0060: Rear HO2S (LH) heater resistance
Heater current requirements too low or high in the heated oxygen sensor
(HO2S) heater control circuit.
Open circuit between HO2S terminal C and main relay No.1 terminal E
Short to ground circuit between HO2S terminal A and body ground
HO2S circuits are shorted each other
DTC P0053: Open circuit between front HO2S (RH) terminal A and PCM
terminal 2J
DTC P0054: Open circuit between rear HO2S (RH) terminal A and PCM
No Go to the next step.
Replace the PCM, then go to the next step.
(See PCM
Yes
REMOVAL/INSTALLATION [MZI-
3.7] .)
No Go to the next step.
Go to the applicable DTC inspection. (See
Yes
DTC TABLE [MZI-3.7].)
No Troubleshooting completed.