Communication Error From HV ECU

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: U0073/94,U0123/62,U0124/95,U0126/63,U0293/59: Control Module Communication Bus OFF
U0293/59 - Communication Error from HV ECU

DESCRIPTION

The skid control ECU receives the signals from the power management control ECU, steering angle sensor, and yaw rate and acceleration sensor via the CAN communication system.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC Check For Intermittent Problems.

ABS/VSC/TRAC





Result:





HINT
Perform the above inspection before removing any sensor or connector.

C -- REPAIR OR REPLACE HARNESS OR CONNECTOR

B -- RECONFIRM DTC
A -- Continue to next step.

2. CHECK IF EACH SENSOR AND ECU CONNECTOR ARE SECURELY CONNECTED

(a) Turn the power switch off.

(b) Check if each sensor and ECU connector are securely connected.

OK:

Each sensor and ECU connector are securely connected.

NG -- CONNECT CONNECTOR TO EACH SENSOR OR ECU CORRECTLY
OK -- Continue to next step.

3. RECONFIRM DTC

(a) Turn the power switch off.

(b) Record the output DTCs (for ABS, VSC, electronically controlled brake system, and/or CAN communication system) Reading and Clearing Diagnostic Trouble Codes for ABS, VSC and/or electronically controlled brake system, or Diagnosis System for CAN communication system).

HINT
If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS, VSC and/or electronically controlled brake system) after the CAN communication system returns to normal.

Result:





C -- INSPECT CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting

B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Electronically Controlled Brake System

A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting

4. REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Turn the power switch off.

(b) Repair or replace the harness or connector.

(c) Check for any momentary interruption between the skid control ECU and each sensor or ECU Check For Intermittent Problems.

(d) Check that there are no momentary interruptions.

NEXT -- Continue to next step.

5. RECONFIRM DTC

(a) Turn the power switch off.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the power switch on (READY).

(d) Drive the vehicle and turn the steering wheel to the right and left at a speed of 15 km/h (9 mph) or more.

(e) Check that no CAN communication system DTC is output Diagnosis System.

(f) If ABS, VSC and/or electronically controlled brake system DTCs are output, record them Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
The CAN communication system must be normal when repairing each sensor DTC (for ABS, VSC and/or electronically controlled brake system).

C -- INSPECT CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting

B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Electronically Controlled Brake System

A -- END