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Flash Reprogramming ECUs Using a Portable Laptop PC

Article ID: 142
Last updated: 15 Apr, 2015

  • Laptops are usually set to a default Power Scheme that controls how long the computer must be idle/inactive before turning off the monitor, sleeping, standby, or shutting down.
    • In Windows 7, the default power setting is Balanced
    • These modes are triggered when the laptop has been inactive for a period of time.  Inactivity is usually defined when there are no user functions being performed.
  • The power scheme default settings have different responses when the laptop is plugged in or running on battery power. 
  • The default settings can potentially be exceeded during a vehicle ECU flash, causing the laptop to shut down the hard drive or enter standby mode. 
  • If a laptop goes into one of these scenarios during an ECU reprogramming attempt, the ECU flash will be interrupted, causing a flash failure. 
  • In most cases flashing an ECU is done within 1 to 5 minutes, but there are ECUs that take much longer to flash.
There are multiple ways to prevent the Laptop from going into this mode.
  • One is to plug the laptop into a power source when using the wiTECH Diagnostic Application for any critical functions to keep the laptop battery constantly charged. 
  • Another option is to navigate to:
  • Here you can change the power settings to accommodate what this laptop is being used for.
  • For performing ECU reprogramming and diagnostics , we suggest creating a power scheme that allows the maximum time on battery power before entering any standby modes. 
  • Once this has been done you can save and name the power plan for future usage when the laptop is running on battery power

Windows 7:

  • If the pop-up below appears during flash reprogramming, simply click on the OK button. 
  • Flash reprogramming of the ECU will not be affected because the file has already been loaded to your PC. 
  • If flash reprogramming is in progress when this pop-up is displayed and acknowledged, reprogramming will still continue and complete successfully. 
  • At the completion of flash, you will have to log into DealerCONNECT again to see the updated part number.
If you have any known networking issue using the wiTECH Diagnostic Application, please contact the wiTECH Help Desk at 1-888-wiTECH-1 (1-888-948-3241) for assistance.

Article ID: 142
Last updated: 15 Apr, 2015
Revision: 3
Views: 33564
Comments: 0
Posted: 28 Apr, 2010 by Rickman B.
Updated: 15 Apr, 2015 by Maynard R.
This article was:   Helpful | Not helpful
Also read
document ECU Flash Failure: What to do Next?

Also listed in
folder ECU Reprogramming (Flash) -> General Flash Information

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