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√ Write Program and Calibration to TCM using ALLISON TCM Reflash (PCCS) Software (Offline)

How to Write Program and Calibration to TCM using ALLISON TCM Reflash (PCCS) Software?

Figure 1.1 - Key Ability:20

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Connecting to TCM:
  • Run "winrw32.exe" through shortcut on desktop.
  • Once opened, click on "Options - Comm Interface" menu.
Options - Comm Interface
  • Select your "Comm Device" and "Comm Protocol", for example: I'm using Nexiq USB-Link (250K CAN/ J1939).
Select Interface: Nexiq USB-Link (250K CAN/ J1939)
  • Click on "TCM Info" menu, then "Display Information". It will pull up all TCM Calibration Info, save or print it.
TCM Info - Display Information
TCM Info - Gen 5th
  • Click on "Calibration" menu, then "Read from TCM" to save current Calibration on TCM. Wait the processes of "Reading calibration from TCM" and "Reading power off data" until 100%, then Save it.
Calibration - Read fromTCM
Reading calibration from TCM
Reading power off data
Calibration Read - Save
  • Click on "Dump" menu, then "Entire Flash" to save flash dump file of the entire TCM. Wait the process of "Dumping entire flash from TCM" until 100%, then Save it.
Dump - Entire Flash
Dumping entire flash from TCM


How to Write Program and Calibration to TCM?
1. Write Calibration
-Click on "Calibration - Write to TCM", and load your Calibration Files (Step No.5).
2. Write Program
-Click on "Program - Erase TCM"
-Click on "Program - Write to TCM", and load your Program Files (Step No.6).

NOTE: you need to copy "keygrace.ifo" file to any folder you want to use to write your calibrations. The default folder is C:\Program Files\Allison Transmission\Allison TCM Reflash (PCCS)\Cal\


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