DTC U0073: Control Module Communication Bus OFF; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0123: Lost Communication With Yaw Rate Sensor Module; DTC U0124: Lost Communication With Lateral Acceleration Sensor Module; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0128: Lost Communication With EPB Module; DTC U0293: Lost Communication With Hybrid Vehicle Control System [05/2019 - ]: Procedure

1. Using the Techstream, check for any momentary interruptions in the wire harness and connector corresponding to a DTC.

   Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2014 - ]

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Yaw Rate Open	Yaw rate sensor open detection	Error or Normal	Normal: Normal	Error: Momentary interruption
   Deceleration Open	Acceleration sensor open detection	Error or Normal	Normal: Normal	Error: Momentary interruption
   Steering Open	Steering sensor open detection	Error or Normal	Normal: Normal	Error: Momentary interruption
   HV Communication Open	Hybrid vehicle communication open detection	Error or Normal	Normal: Normal	Error: Momentary interruption

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display
   Yaw Rate Open
   Deceleration Open
   Steering Open
   HV Communication Open

   Result

   Result	Proceed to
   There is a constant open circuit.	A
   There are no momentary interruptions.	B
   There are momentary interruptions.	C

   HINT: 

   Perform the above inspection before disconnecting any sensors or connectors.

Result: 

B 

See step  3

Result: 

C 

See step  4

Result: 

A 

See step  2

1. Turn the power switch off.
2. Check if each sensor and ECU connector is securely connected.

   OK

   Each sensor and ECU connector is securely connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTOR TO EACH SENSOR OR ECU CORRECTLY 

Result: 

OK 

See step  3

1. Turn the power switch off.
2. Record the output DTCs (for the ABS, VSC, electronically controlled brake system and/or CAN communication system).

   for the ABS, VSC and Electronically Controlled Brake System: Refer to DTC CHECK / CLEAR [05/2019 - ]

   for the CAN Communication System: Refer to DIAGNOSIS SYSTEM [05/2019 - 10/2019] , or refer to DIAGNOSIS SYSTEM [10/2019 - 07/2020] , or refer to DIAGNOSIS SYSTEM [07/2020 - ]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   HINT: 

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

   Result

   Result	Proceed to
   DTCs are not output.	A
   ABS, VSC and/or electronically controlled brake system DTCs are output.	B
   CAN communication system DTCs are output.	C

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2019 - 10/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2019 - 07/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ] 

Result: 

B 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to  DIAGNOSTIC TROUBLE CODE CHART [05/2019 - 07/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [07/2020 - ] 

Result: 

C 

INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2019 - ] 

1. Turn the power switch off.
2. Repair or replace the harness or connector.
3. Check for any momentary interruptions between the skid control ECU (brake booster with master cylinder assembly) and each sensor or ECU.

   Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2014 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Turn the power switch off.
2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [05/2019 - ]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

3. Turn the power switch on (READY).
4. Drive the vehicle at a speed of 15 km/h (9 mph) or more and turn the steering wheel to the right and left.
5. Check that no CAN communication system DTCs are output.

   Refer to DIAGNOSIS SYSTEM [05/2019 - 10/2019] , or refer to DIAGNOSIS SYSTEM [10/2019 - 07/2020] , or refer to DIAGNOSIS SYSTEM [07/2020 - ]

6. If ABS, VSC and/or electronically controlled brake system DTCs are output, record them.

   Refer to DTC CHECK / CLEAR [05/2019 - ]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output.	A
   ABS, VSC and/or electronically controlled brake system DTCs are output.	B
   CAN communication system DTCs are output.	C

   HINT: 

   The CAN communication system must be normal when performing troubleshooting for sensor DTCs (for the ABS, VSC and/or electronically controlled brake system).

Result: 

A 

END 

Result: 

B 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to  DIAGNOSTIC TROUBLE CODE CHART [05/2019 - 07/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [07/2020 - ] 

Result: 

C 

INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2019 - ]