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Home >> Toyota >> 2015 >> 4Runner TRD Pro >> Repair and Diagnosis (Single Page) >> Electrical >> Starter >> Smart Key System (Keyless Start) - (Diagnostic Codes & Symptom Tests) >> Smart Key System (For Start Function) >> DTC U0100: Lost Communication with ECM / PCM; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Main Body ECU; DTC U0155: Lost Communication with Combination Meter [08/2014 - ] >> Procedure
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DTC U0100: Lost Communication with ECM / PCM; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Main Body ECU; DTC U0155: Lost Communication with Combination Meter [08/2014 - ]: Procedure

  1. CHECK FOR DTC 
    1. Check for DTCs and note any codes that are output. Refer to DTC CHECK / CLEAR [08/2014 - ] .
    2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2014 - ] .
    3. Recheck for DTCs. Refer to DTC CHECK / CLEAR [08/2014 - ] .
      RESULT

      Result Proceed to
      DTC is not output A
      DTC is output B

    B → See step   3 

    A → See step   2 

  2. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2014 - ] 
  3. GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2014 - ]