DTC    U0293    Lost Communication with HV ECU

for Preparation Click here


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).

HINT:
  1. When the power management control ECU is replaced with a new one and the cable from the negative (-) auxiliary battery terminal is connected, the power source mode becomes the on (IG) mode. When the auxiliary battery is removed and reinstalled, the power source mode that was selected when the auxiliary battery was removed is restored.
  2. When the auxiliary battery cable is disconnected and reconnected, the power source returns to the mode it was in before the auxiliary battery cable was disconnected.


DTC No.
DTC Detection Condition
Trouble Area
U0293
CAN communication signal error inside the power management control ECU (power control section - HV control section).
  1. Power management control ECU

WIRING DIAGRAM


B275476E01


INSPECTION PROCEDURE

NOTICE:
  1. When using the intelligent tester with the power switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle, select the vehicle type under manual mode, and then enter the following menus:
    for Power Source Control: Body / Power Source Control / DTC.
    for Entry&Start: Body / Entry&Start / DTC.
  2. The push-button start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting (Click here).
  3. After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

1.CHECK HARNESS AND CONNECTOR (AUXILIARY BATTERY - POWER MANAGEMENT CONTROL ECU)

  1. Disconnect the H3 and H4 connectors from the power management control ECU.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H3-1 (AM22) - Body ground
    		Always
    		9.5 to 16 V
    H4-7 (AM21) - Body ground
    		Always
    		9.5 to 16 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

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

    Standard Resistance:
    Tester Connection
    		Condition
    		 Specified Condition
    H3-5 (E01) - Body ground
    		Always
    		Below 1 Ω
    H3-6 (E1) - Body ground
    		Always
    		Below 1 Ω
    H4-4 (E12) - Body ground
    		Always
    		Below 1 Ω
    H4-5 (E02) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK FOR DTC

  1. Clear the DTCs (Click here).

  1. Check for DTCs again.

    OK:
    DTC U0293 is not output



NG
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
OK

USE SIMULATION METHOD TO CHECK (Click here)