On some vehicles, the MIL may be illuminated and have DTC P0456 stored in PCM
- P0456: Evap System Leak Detection (very small leak)
The DTC may be caused by incorrect software calibration in the PCM.
Customers having this concern should have their vehicle repaired using the
following repair procedure.
- Using WDS B30.6 or later software, reprogram the PCM to the latest
calibration (refer to "Calibration Information" table) by
following the "Module Reprogramming" procedure.
- Always update the WDS PTU first, then install the needed calibration
file that WDS shows during PCM reprogramming. Go to "WDS
Calibration" on ESI and download the "update" file. If
the PTU is not updated to the latest WDS calibration level, the
calibration file will not install into the PTU.
- It is not necessary to remove any fuses or relays during PCM
reprogramming when the WDS screen prompts you to do so. You may
accidentally stop power to one of the PCM terminals and cause the PCM to
be blanked, or you may receive error messages during the WDS
- WDS shows the calibration part numbers after programming the PCM.
- Please be aware that PCM calibration part numbers and file names
listed in any Service Bulletin may change due to future releases of WDS
software, and additional revisions made to those calibrations for
service related concerns.
- When reprogramming a PCM, WDS will always display the
"latest" calibration P/N available for that vehicle. If any
calibration has been revised/updated to contain new information for a
new service concern/issue, it will also contain all previously released
- When performing this procedure, if the WDS PTU is not docked and
connected to 115V-120V, we recommend that a battery charger be installed
on the vehicle battery and turned ON to a maximum charge of no more than
20 AMPS to keep the vehicle battery up to capacity. If you exceed 20
AMPS, it will damage the WDS PTU.
- After performing the PCM reprogramming procedure, verify the repair by
starting the engine and making sure there are no MIL illumination or
abnormal warning lights present.
NOTE: After PCM reprogramming, it is no longer necessary to road test
the vehicle to "relearn" KAM (Keep Alive Memory).
- Place an "Authorized Modification" label (P/N 9999-95-AMDC-97)
with the new calibration information near the Emission Control Information
Label located on the hood or in the engine compartment.
|New PCM Calibration Part Number
||w/o Immobilizer System
||w/ Immobilizer System
NOTE: The PCM Calibration Part Numbers listed above are provided for
PCM reprogramming purposes only. These are not necessarily the same Mazda part
numbers used to order an actual PCM through the Mazda Parts System. It is not
necessary to order a PCM as part of this repair procedure.
Note: This information applies to verified customer complaints on vehicles covered under normal warranty.
Refer to the SRT microfiche for warranty term information.
NOTE: Additional diagnostic time cannot be claimed for this repair.
|Part Number Main Cause
||AJYR-18-881 (w/o Immobilizer)
AJYS-18-881 (w/ Immobilizer)