Some 2010-2011 Mazda3 vehicles equipped with the 2.0L engine may experience a 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.
- Check the FFD and verify that it meets the following criteria:
- 2010: ECT is between 172.4 degrees F and 176.0 degrees F.
- 2011: ECT is 179.6 degrees F or above and AAT is 114.8 degrees F or below.
If the FFD does meet this criteria, proceed to Step 2. If not, this TSB does not apply.
- Reboot the IDS to clear memory before reprogramming.
- Using IDS 75.07 or later software, reprogram the PCM to the latest calibration by following the “Module Reprogramming” procedure. This new calibration is not included in the VCM 2011.9 DVD.
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 part number available for that vehicle. If any calibration has been revised/updated to contain new information for a new service concern, it will also contain all previously released calibrations.
- When performing this procedure, a battery charger must be installed to 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.
- After performing the PCM reprogramming procedure, verify the repair by starting the engine and making sure that no MIL illumination or abnormal warning lights are present.
CALIBRATION INFORMATION
YEAR ENGINE TRANS. SPEC. FILE NAME
2010……..2.0L………..A/T…………….FED……………..LF8M-188K2-F
2010……..2.0L………..A/T…………….CAL. ……………LF3T-188K2-F
2010……..2.0L………..A/T…………….MEX. ……………LF8P-188K2-G
2010……..2.0L………..M/T…………….FED……………..LF8J-188K2-H
2010……..2.0L………..M/T…………….CAL. ……………LF8K-188K2-H
2010……..2.0L………..M/T…………….MEX. ……………LF8L-188K2-H
2011……..2.0L………..A/T……………..FED………………LFGV-188K2-C
2011……..2.0L………..A/T……………..CAL. ……………..LFHP-188K2-C
