DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with ECM / PCM; DTC U0124: Lost Communication with Lateral Acceleration Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module [07/2015 - ]: Procedure

1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (Refer to CHECK FOR INTERMITTENT PROBLEMS [07/2015 - ] ).
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   EFI Communication Open	ECM communication 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	-
   Deceleration Open	Acceleration sensor 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	-

   Result

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

   HINT: 

   Perform the above inspection before removing the sensor and connector.

Result:  B

B 

See step  3

Result:  C

C 

See step  4

Result:  A

A 

See step  2

1. Turn the engine switch off.
2. Check if each sensor, ECM and yaw rate and acceleration sensor (airbag sensor assembly) connector is securely connected.

   OK

   Each connector is securely connected.

Result:  NG

NG 

CONNECT CONNECTOR TO EACH SENSOR, ECM, AIRBAG SENSOR ASSEMBLY CORRECTLY 

Result:  OK

OK 

See step  3

1. Turn the engine switch off.
2. Record the output DTCs (for VSC system and/or CAN communication system) (Refer to DTC CHECK / CLEAR [07/2015 - ] for VSC system. Refer to DIAGNOSIS SYSTEM [07/2015 - 08/2016] Refer to DIAGNOSIS SYSTEM [08/2016 - ] for CAN communication system (w/ Central Gateway ECU) or. Refer to DIAGNOSIS SYSTEM [07/2015 - 08/2016] Refer to DIAGNOSIS SYSTEM [08/2016 - ] for CAN communication system (w/o Central Gateway ECU).

   HINT: 

   If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for VSC system) after the CAN communication system returns to normal.

   Result

   Result	Proceed to
   DTCs are not output.	A
   DTCs (relating to VSC system) are output.	B
   DTCs (relating to CAN communication system) are output (w/ Central Gateway ECU).	C
   DTCs (relating to CAN communication system) are output (w/o Central Gateway ECU).	D

Result:  A

A 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [07/2015 - ] )

Result:  B

B 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [07/2015 - ] )

Result:  C

C 

INSPECT CAN COMMUNICATION SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [07/2015 - ] )

Result:  D

D 

INSPECT CAN COMMUNICATION SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [07/2015 - ] )

1. Turn the engine switch off.
2. Repair or replace the harness or connector.
3. Check for any momentary interruptions between the skid control ECU (brake actuator assembly) and each sensor, ECM and yaw rate and acceleration sensor (airbag sensor assembly) (Refer to CHECK FOR INTERMITTENT PROBLEMS [07/2015 - ] ).

Result:  NEXT

NEXT 

See step  5

1. Turn the engine switch off.
2. Clear the DTCs (Refer to DTC CHECK / CLEAR [07/2015 - ] ).
3. Turn the engine switch off.
4. Start the engine.
5. Drive the vehicle at a speed of 15 km/h (9 mph) or more and turn the steering wheel to the right and left.
6. Check that no CAN communication system DTCs are output (Refer to DIAGNOSIS SYSTEM [07/2015 - 08/2016] Refer to DIAGNOSIS SYSTEM [08/2016 - ] for with Central Gateway ECU. Refer to DIAGNOSIS SYSTEM [07/2015 - 08/2016] Refer to DIAGNOSIS SYSTEM [08/2016 - ] for without Central Gateway ECU).
7. If VSC system DTCs are output, record them (Refer to DTC CHECK / CLEAR [07/2015 - ] ).

   Result

   Result	Proceed to
   DTCs are not output.	A
   DTCs (relating to VSC system) are output.	B
   DTCs (relating to CAN communication system) are output (w/ Central Gateway ECU).	C
   DTCs (relating to CAN communication system) are output (w/o Central Gateway ECU).	D

   HINT: 

   The CAN communication system must be normal when repairing each sensor DTC (for VSC system).

Result:  A

A 

END 

Result:  B

B 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [07/2015 - ] )

Result:  C

C 

INSPECT CAN COMMUNICATION SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [07/2015 - ] )

Result:  D

D 

INSPECT CAN COMMUNICATION SYSTEM 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [07/2015 - ] )