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Frozen Mazda limp

Some 2009 Mazda6 2.5L and 2010 Mazda3 2.0L vehicles (2010 models built before Aug. 1, 2009) may experience a MIL illumination with DTC P2100:00 (Throttle Valve Actuator Circuit Open). In order to prevent engine damage, the PCM may shift into “Limp Home” mode, which results in a lack of power.

This concern is caused when moisture contained in the EGR valve gas becomes solidified at extremely low temperature and jams between the throttle body and valve. With this situation, the actual throttle valve opening angle becomes different from the target angle, and the PCM self-monitoring function triggers the MIL with DTC P2100:00. The EGR control program has been changed to stop the EGR system below 5 degrees Fahrenheit at the intake air temperature sensor.

1. Reboot the IDS to clear memory before reprogramming.

2. Using IDS 64.09 or later software, reprogram the PCM to the latest calibration (refer to “Calibration Information” table) by following the “Module Reprogramming” procedure.

  • 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.
  • 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 performing this procedure, a battery charger must be connected to the vehicle battery and turned on to a maximum charge of no more than 20 amps to keep the battery up to capacity. Do not exceed 20 amps to avoid damaging the VCM.

3. After performing the PCM reprogramming, verify the repair by starting the engine and making sure that there are no MIL illuminations or abnormal warning lights present. After reprogramming the PCM, it is no longer necessary to road test the vehicle to “relearn” KAM (Keep Alive Memory).

CALIBRATION INFORMATION

MAZDA6 2.5L

Specification                      Transmission             New PCM Calibration P/N

USA (Fed/Canada)………………….M/T………………………L518-18881-K

USA (Fed/Canada)………………….A/T……………………….L519-18881-K

USA (Calif.)………………………….M/T.....……..…………….L520-18881-K

USA (Calif.)………………………….A/T………………………..L521-18881-K

Mexico……………………………….M/T……………………….L549-18881-F

Mexico……………………………....A/T………………………..L550-18881-F

MAZDA3 2.0L

USA (Fed/Canada)………………..M/T……………………….LF8J-18881-D

USA (Fed/Canada)………………..A/T………………………..LF8M-18881-D

USA (Calif.)………………………..M/T………………….…….LF8K-18881-D

USA (Calif.)…………………………A/T………………………..LF3T-18881-D

Mexico………………………………M/T………………………..LF8L-18881-D

Mexico………………………………A/T………………………..LF8P-18881-D

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