DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with ECM / PCM; DTC U0123: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module [10/2014 - 10/2015]: Procedure

1. Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC (Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2014 - ] ).
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   EFI Communication Open	EFI 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	-
   Steering Open	Steering angle sensor open detection / Error or Normal	Error: Momentary interruption Normal: Normal	-

   Result

   Result	Proceed to
   There is a constant interruption. (Error is displayed without interruption.)	A
   There are no momentary interruptions.	B
   There are momentary interruptions. (Error is displayed intermittently.)	C

   HINT: 

   Perform the above inspection before disconnecting any sensors or connectors.

B 

See step  3

C 

See step  4

A 

See step  2

1. Turn the engine switch off.
2. Check if each sensor or ECM connector is securely connected.

   OK

   Each connector is securely connected.

NG 

CONNECT CONNECTOR TO EACH SENSOR OR ECM CORRECTLY 

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 [10/2014 - ] for VSC system, or DIAGNOSIS SYSTEM [10/2014 - 10/2015] for CAN communication system).

   HINT: 

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

   Result

   Result	Proceed to
   DTCs are not output.	A
   DTCs are output.	B
   CAN communication system DTCs are output.	C

A 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )

B 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2014 - 10/2015] )

C 

INSPECT CAN COMMUNICATION SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )

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 and each sensor or ECM (Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2014 - ] ).

NEXT 

See step  5

1. Turn the engine switch off.
2. Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).
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 [10/2014 - 10/2015] ).
7. If VSC system DTCs are output, record them (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

   Result

   Result	Proceed to
   DTCs are not output.	A
   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 VSC system).

A 

END 

B 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2014 - 10/2015] )

C 

INSPECT CAN COMMUNICATION SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )