Engine Controls - MIL ON/DTC P0128:00 Set

Bulletin No: 01-003/12

Last Issued: 03/12/2012

Subject:
MIL ON WITH DTC P0128:00





BULLETIN NOTE





APPLICABLE MODEL(S)/VINS

2010-2011 Mazda3 with 2.0L (LF) engine - 2010 (All) and 2011 (A/T)

DESCRIPTION

Some vehicles may experience the MIL on with DTC P0128:00 (Thermostat stuck open). This is caused by improper control logic of the PCM. To repair the problem, the control logic of the PCM has been changed.

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

REPAIR PROCEDURE

1. Check the FFD and verify that it meets the following criteria.
Mazda3
^ 2010: "ECT" is between 78°C (172.4°F) and 80°C (176.0°F)
^ 2011: "ECT" is 82°C (179.6°F) or above and "AAT" is 46C (114.8°F) or below





Mazda5
ECT: Engine Coolant Temperature
AAT: Ambient Air Temperature
- If the FFD does meet the criteria, go to step 2.
- If the FFD does not meet the criteria, this information does not apply.

2. Reboot the IDS to clear memory before reprogramming.





3.

NOTE:
^ Always update the IDS tool first, then follow on-screen instructions to download the needed calibration file for PCM reprogramming.

^ It is not necessary to remove any fuses or relays during PCM reprogramming when the IDS 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 IDS reprogramming procedure.

^ IDS 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 IDS software, and additional revisions made to those calibrations for service related concerns.

^ When reprogramming a PCM, IDS 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, 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 could damage the VCM.

4. 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:
^ If any DTCs should remain after performing DTC erase, diagnose the DTCs using MS3 online instructions or Workshop Manual section 01-02.

^ After PCM reprogramming, it is no longer necessary to road test the vehicle to "relearn" KAM (Keep Alive Memory).





CALIBRATION INFORMATION





WARRANTY INFORMATION