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US BULLETIN No: 01-021/04 DATE: 06/2004
CAN BULLETIN No: N/A
APPLIES TO: 2002-2003 MPV AFFECTED VINs: All
SUBJECT: MIL Illumination with DTC P0456
DETAILS:

On some vehicles, the MIL may be illuminated and have DTC P0456 stored in PCM memory.

  • 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.

REPAIR PROCEDURE

  1. 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.
    NOTE:
    • 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 reprogramming procedure.
    • 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 calibrations.
    • 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.
  2. 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).
  3. 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.

CALIBRATION INFORMATION

New PCM Calibration Part Number File Name Note
2JLU-12A650-AA QHBA6A0 w/o Immobilizer System
2JLU-12A650-BA QHBA6B0 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.

WARRANTY INFORMATION

Note: This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.

Warranty Type A
Symptom Code 6X 
Damage Code 9W 
Part Number Main Cause AJYR-18-881 (w/o Immobilizer)
AJYS-18-881 (w/ Immobilizer) 
Quantity
Operation Number XX633XRX 
Labor Hours 0.7 Hrs.  
NOTE: Additional diagnostic time cannot be claimed for this repair.
CONSUMER NOTICE:
The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by "do-it-yourselfers." Consumers should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies, consumers should contact their nearest authorized Mazda dealership.
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