CAN COMMUNICATION SYSTEM (for LHD), Diagnostic DTC:U0293

DTC Code DTC Name
U0293 Lost Communication with HV ECU

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0293 There is no communication from the hybrid vehicle control ECU.

  • Power source or inside of hybrid vehicle control ECU

  • Hybrid vehicle control ECU CAN main wire or connector

  • Hybrid vehicle control ECU CAN branch wire or connector

  • Hybrid vehicle control ECU

WIRING DIAGRAM

A01GZ8HE02

INSPECTION PROCEDURE

Note

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

Tech Tips

Operating the power switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. PRECAUTION

    Note

    After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work Click here.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) auxiliary battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (HYBRID VEHICLE CONTROL ECU CAN WIRE)


    1. A01GWUWE02
      Text in Illustration
      *A Braking and Driving Bus
      *B HV Engine Bus
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      Disconnect the hybrid vehicle control ECU connectors.

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

      Standard Resistance
      Braking and Driving Bus
      Tester Connection Switch Condition Specified Condition
      A76-11 (CA2H) - A76-12 (CA2L) Power switch off 54 to 69 Ω
      HV Engine Bus
      Tester Connection Switch Condition Specified Condition
      A77-8 (CAN+) - A77-9 (CAN-) Power switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (Braking and Driving Bus) B
      NG (HV Engine Bus) C

    B

    REPAIR OR REPLACE HYBRID VEHICLE CONTROL ECU CAN BRANCH WIRE OR CONNECTOR (CA2H, CA2L)

    C

    REPAIR OR REPLACE HYBRID VEHICLE CONTROL ECU CAN MAIN WIRE OR CONNECTOR (CAN+, CAN-)

    A

  4. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY AND BODY GROUND)


    1. Connect the cable to the negative (-) auxiliary battery terminal.

      A01GXG3E09
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      		 - -

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. Disconnect the hybrid vehicle control ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A76-1 (BATT) - Body ground Always 11 to 14 V
      A76-4 (IGSW) - Body ground Power switch on (IG) 11 to 14 V
      A78-1 (+B1) - Body ground Power switch on (IG) 11 to 14 V
      A78-2 (+B2) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A77-7 (E1) - Body ground Always Below 1 Ω
      A77-6 (E12) - Body ground Always Below 1 Ω
      E58-7 (GND1) - Body ground Always Below 1 Ω
      E58-6 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here