DTC U0073/94: Control Module Communication Bus OFF; DTC U0123/62: Lost Communication with Yaw Rate Sensor Module; DTC U0124/95: Lost Communication with Lateral Acceleration Sensor Module; DTC U0126/63: Lost Communication with Steering Angle Sensor Module; DTC U0293/59: Communication Error from HV ECU: 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 .
   ABS/VSC/TRAC
   
   

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

   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 removing any sensor or connector.

B → See step   3 

C → See step   4 

A: Go to next step 

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

   OK

   Each sensor and ECU connector is securely connected.

NG → CONNECT CONNECTOR TO EACH SENSOR OR ECU CORRECTLY 

OK: Go to next step 

1. Turn the ignition switch off.
2. Record the output DTCs (for ABS, VSC, electronically controlled brake system, and/or CAN communication system) [ABS, VSC and/or electronically controlled brake system:, refer to DTC CHECK / CLEAR , CAN communication system (w/ Smart Key System):, refer to DIAGNOSIS SYSTEM , CAN communication system (w/o Smart Key System):, refer to DIAGNOSIS 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

   Result	Proceed to
   DTC is not output	A
   ABS, VSC and/or electronically controlled brake system DTC is output	B
   CAN communication system DTC is output (w/ Smart Key System)	C
   CAN communication system DTC is output (w/o Smart Key System)	D

B → See step   7 

C → See step   8 

D → See step   9 

A → See step   6 

1. Turn the ignition switch off.
2. Repair or replace the harness or connector.
3. Check for any momentary interruption between the skid control ECU and each sensor or ECU, refer to CHECK FOR INTERMITTENT PROBLEMS .
4. Confirm that there are no momentary interruptions.

NEXT: Go to next step 

1. Turn the ignition switch off.
2. Clear the DTCs, refer to DTC CHECK / CLEAR .
3. Turn the ignition switch to 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 DTC is output (w/ Smart Key System:, refer to DIAGNOSIS SYSTEM , w/o Smart Key System:, refer to DIAGNOSIS SYSTEM ).
6. If ABS, VSC and/or electronically controlled brake system DTCs are output, record them, refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC is not output	A
   ABS, VSC and/or electronically controlled brake system DTC is output	B
   CAN communication system DTC is output (w/ Smart Key System)	C
   CAN communication system DTC is output (w/o Smart Key System)	D

   HINT: 

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

B → See step   7 

C → See step   8 

D → See step   9 

A → END