ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:U0100, U0129, U0142, U0155

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM
U0129 Lost Communication with Brake System Control Module
U0142 Lost Communication with Main Body ECU
U0155 Lost Communication with Combination Meter

DESCRIPTION

The power management control ECU receives information from 2 sources. It receives information via a direct line and via the CAN communication line. If the information from these 2 sources is inconsistent, this DTC is stored.

Tech Tips

When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode is reset to on (IG). When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC Code DTC Detection Condition Trouble Area
U0100 There is no communication from the ECM.

  • CAN communication system

  • ECM
U0129 There is no communication from the skid control ECU.

  • CAN communication system

  • Skid control ECU
U0142 There is no communication from the main body ECU.

  • CAN communication system

  • Main body ECU (Driver side junction block assembly)
U0155 There is no communication from the combination meter.

  • CAN communication system

  • Combination meter assembly

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs and note any codes that are output Click here.

    2. Clear the DTCs Click here.

    3. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output for LHD with Entry and Start System B
      for RHD with Entry and Start System C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

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

    C

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