Prius 2004 problem code U0293

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by longkheang, May 14, 2014.

  1. longkheang

    longkheang Junior Member

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    My Prius 2004 with mile: 14x,xxx get problem with master light and another 3lights follow photos in attachment.

    After i brought to dealer to diagnostic check and found error code U0293 (lost communication with control system).

    Note: I can drive it and everything work fine, if i restart the car few time than the Master warning light is off and appear only CHECK light and Master warning. If i try to restart the car another few times then all the warning light went off as normal.

    Dealer cannot found problem, can anyone HELP please! :(
    Sorry for my English.
     

    Attached Files:

    #1 longkheang, May 14, 2014
  2. Patrick Wong

    Patrick Wong DIY Enthusiast

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    DTC U0293 is posted by the engine ECU and means that it lost communication with the hybrid vehicle ECU. So either the wiring harness has a problem or one of those two ECUs has failed.
     
    #2 Patrick Wong, May 14, 2014
  3. longkheang

    longkheang Junior Member

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    Thank Patrick, do you have any link to guid how to check cable and ECU?
     
    #3 longkheang, May 15, 2014
  4. bisco

    bisco cookie crumbler

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    if it drives normal, i winder what the purpose of the ecu's is?
     
    #4 bisco, May 15, 2014
  5. usnavystgc

    usnavystgc Die Hard DIYer and Ebike enthusiast.

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    If everything reset and the car drives fine, you may have had a momentary loss of communication between the ECU's. If it were me, I would check the voltage on my 12V battery and consider replacing it. If the car is running fine now, that is your likely culprit.
     
    #5 usnavystgc, May 15, 2014
  6. Patrick Wong

    Patrick Wong DIY Enthusiast

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    techinfo.toyota.com or
    Toyota Service Information
     for factory repair manual info. However, I do not know if you can subscribe to either website since you are in Asia.
     
    #6 Patrick Wong, May 15, 2014
  7. tracy ing

    tracy ing Active Member

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    or the HEV fuse under the hood is blown
     
    #7 tracy ing, Feb 17, 2018
    SFO likes this.
  8. bisco

    bisco cookie crumbler

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    that's probably it.
     
    #8 bisco, Feb 17, 2018
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