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CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0129

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DTC Code DTC Name
U0129 Lost Communication with Skid Control ECU
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DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U0129 Lost Communication with Skid Control ECU Communication stop occurs between the skid control ECU assembly and ECU or sensor outputs DTC(s)

  • Skid control ECU assembly

  • Skid control ECU assembly CAN main wire or connector

  • Front steering control ECU (w/ Variable Gear Ratio Steering System)

  • Rack and pinion power steering gear assembly

  • Rear steering control ECU (w/ Dynamic Rear Steering System)
Table 1. *1 No. 5 CAN Junction Connector *2 Skid Control ECU Assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

CAUTION:

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.

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  • Before measuring the resistance of the CAN bus, turn the power 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 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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

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

    DTC check procedure: Turn the power switch on (IG) 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.

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Tip:

  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

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PROCEDURE


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    CHECK FOR OPEN IN CAN BUS WIRE (SKID CONTROL ECU ASSEMBLY MAIN WIRE)


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. Disconnect the A11 skid control ECU assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A11-10 (CA2H) - A11-11 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE SKID CONTROL ECU ASSEMBLY for LHD:Click here

      REPLACE SKID CONTROL ECU ASSEMBLY for RHD:Click here

    • NG

      REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR