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Home >> Toyota >> 2018 >> 4Runner TRD Pro >> Repair and Diagnosis (Single Page) >> Body & Frame >> Door Locks >> Smart Key System (For Start Function) - 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 [08/2015 - 08/2019] >> 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 [08/2015 - 08/2019]: Procedure

  1. CHECK FOR DTC 
    1. Check for DTCs and note any codes that are output (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    2. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    3. Recheck for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
      RESULT

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

    Result: 

    USE SIMULATION METHOD TO CHECK 

    (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] )

    Result: 

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) 

    (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] )