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Home >> Toyota >> 2025 >> 4Runner TRD Pro >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (HEV) - Circuit Tests (1 Of 3) & Diagnostic Codes >> CAN COMMUNICATION SYSTEM (for 1Motor-HEV Model) >> DTC U0077-88: Control Module Communication Bus "E" Off Bus Off; DTC U0137-87: Lost Communication With Trailer Brake Control Module Missing Message; DTC U029A-87: Lost Communication with Hybrid/EV Battery Sensor Module Missing Message; DTC U111A-00: Lost Communication with ECM/PCM "A" (ch2); DTC U111A-87: Lost Communication with ECM/PCM "A" (ch2) Missing Message; DTC U1150-87: Lost Communication with Hybrid Powertrain Control Module (ch2) Missing Message; DTC U1170-87: Lost Communication with Brake System Control Module (Secondary CAN Line) Missing Message; DTC U117D-87: Lost Communication with Brake System Control Module (ch4) Missing Message [12/2024 - ] >> Caution / Notice / Hint
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Caution / Notice / Hint

WARNING:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTE:
  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2024 - ]

  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 10 minutes or more before measuring the resistance.
  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Refer to BEFORE DISCONNECTING BATTERY [12/2024 - ]

  • When disconnecting and reconnecting the auxiliary battery.

    HINT: 

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Refer to AUTOMATIC LEARNING CHART [12/2024 - ]

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Refer to WORK PROCEDURE [12/2024 - ]

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

    Refer to DIAGNOSIS SYSTEM [12/2024 - ]

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the hybrid vehicle control ECU assembly, refer to Registration.

    Refer to REGISTRATION [12/2024 - ]

HINT: 

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