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SMART ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:U0293

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DTC Code DTC Name
U0293 Lost Communication with HV ECU
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DESCRIPTION

This DTC is stored when the power management control ECU detects a CAN communication error inside the power management control ECU (power control section - HV control section).

Tip:

When the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
U0293 CAN communication error inside the power management control ECU (power control section - HV control section). (1-trip detection logic*)

  • AM2 fuse

  • Power management control ECU

  • Wire harness or connector

 Turn the power switch on (IG) and wait 10 seconds or more.

Table 1. Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
There is no effect on vehicle behavior. -
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the vehicle power switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The smart entry and start system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting (Click here). Troubleshoot the smart entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

Tip:
Table 2. Related Data List and Active Test Items
DTC Data List Item Active Test Item
U0293 - -
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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. Disconnect the H1 and H2 power management control ECU connectors.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H1-1 (AM22) - Body ground Power switch off 11 to 14 V
      H2-7 (AM21) - Body ground Power switch off 11 to 14 V
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Management Control ECU)

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE

  2. Click here

    CHECK HARNESS AND CONNECTOR (GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H1-5 (E01) - Body ground Always Below 1 Ω
      H1-6 (E1) - Body ground Always Below 1 Ω
      H2-4 (E12) - Body ground Always Below 1 Ω
      H2-5 (E02) - Body ground Always Below 1 Ω
      Table 4. Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Management Control ECU)

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs again.

      OK
      DTC U0293 is not output

    • OK

      END (USE SIMULATION METHOD TO CHECK) (Click here)

    • NG

      REPLACE POWER MANAGEMENT CONTROL ECU (Click here)