01-008/04 2004 MAZDA3 - MIL ILLUMINATION WITH DTC P0128

Note: This bulletin contains revised sections. Please update your records accordingly.

BULLETIN NOTE

This bulletin supersedes last issued 02/13/04. The APPLICABLE MODEL(S)/VINS and WARRANTY INFORMATION have been revised.

APPLICABLE MODEL(S)/VINS

2004 MAZDA3

VIN Lower Than	Vehicle Application
JM1 BK1431 41 152012	FED / Canada, 2.3L, M/T
JM1 BK1234 41 150905	FED / Canada, 2.3L, A/T
JM1 BK12F5 41 151846	FED / Canada, 2.0L, M/T
JM1 BK12F1 41 151679	FED / Canada, 2.0L, A/T
JM1 BK1436 41 152555	CAL, 2.3L, M/T
JM1 BK1232 41 150952	CAL, 2.3L, A/T
JM1 BK12F5 41 150194	CAL, 2.0L, M/T
JM1 BK32F0 41 149661	CAL, 2.0L, A/T

DESCRIPTION

Some vehicles may experience the MIL illumination with DTC P0128 (Coolant Thermostat Stuck Open) stored in memory. This condition may be caused by improper PCM calibration.

Customers having this concern should have their vehicles repaired using the following procedure.

Please update the PCM of vehicles in dealer inventory. When a customer brings their vehicle in for service, update their PCM also.

REPAIR PROCEDURE

1. Verify customer concern.

2. Using WDS B29.2 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.

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.

4. Verify repair.

   NOTE: After reprogramming a PCM, it is necessary to road test the vehicle to relearn KAM (Keep Alive Memory) strategy and verify no MIL illumination or DTC's are present.

CALIBRATION INFORMATION

New PCM Calibration Part Number	File Name	Vehicle Application
L373-18-881D	SW-L373ED020	FED / Canada, 2.3L, M/T
L374-18-881D	SW-L374ED020	FED / Canada, 2.3L, A/T
LF66-18-881D	SW-LF66ED020	FED / Canada, 2.0L, M/T
LF68-18-881D	SW-LF68ED020	FED / Canada, 2.0L, A/T
L3A1-18-881C	SW-L3A1EC020	CAL, 2.3L, M/T
L3A2-18-881C	SW-L3A2EC020	CAL, 2.3L, A/T
LF67-18-881C	SW-LF67EC010	CAL, 2.0L, M/T
LF69-18-881C	SW-LF69EC010	CAL, 2.0L, A/T

WARRANTY INFORMATION

NOTE:

• This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair. Refer to the SRT microfiche for warranty term information.
• Additional diagnostic time cannot be claimed for this repair.