DTC U0073/94, U0100/65, U0123/62, U0124/95, U0126/63: Control Module Communication Bus OFF; Lost Communication with ECM/PCM; Lost Communication with Yaw Rate Sensor Module; Lost Communication with Lateral Acceleration Sensor Module; Lost Communication with Steering Angle Sensor Module: Procedure

1. Using Techstream, check for any momentary interruption 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	Diagnosis Condition
   EFI Communication Open	EFI communication open detection/ERROR or NORMAL	ERROR: Momentary interruption NORMAL: Normal	-
   Steering Open	Steering 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

   Condition	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 the sensor and connector.

B → See step   3 

C → See step   4 

A: Go to next step 

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

   OK

   The connector is securely connected.

NG → CONNECT CONNECTOR TO EACH SENSOR OR ECM CORRECTLY 

OK: Go to next step 

1. Turn the engine switch off.
2. Record the output DTCs (for ABS, VSC, and CAN communication).

   HINT: 

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

   Result

   Condition	Proceed to
   DTC (CAN communication system DTC) is output	A
   DTC (ABS and/or VSC DTC) is output	B
   DTC is not output	C

B → See step   6 

C → CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) 

A → INSPECT CAN COMMUNICATION SYSTEM 

1. Turn the engine 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 ECM. Refer to CHECK FOR INTERMITTENT PROBLEMS .
4. Check that there is no momentary interruption.

NEXT: Go to next step 

1. Turn the engine switch off.
2. Clear the DTC. Refer to DTC CHECK/CLEAR .
3. Start the engine.
4. Drive the vehicle and turn the steering wheel to the right and left at a speed of 15 km/h (9 mph) or more.
5. Check that no CAN communication system DTC is output.
6. If ABS and VSC DTCs are output, record them.

   Result

   Condition	Proceed to
   DTC output for the CAN communication system	A
   No DTC is output (ABS and/or VSC DTC is output)	B
   No DTC is output (No ABS and/or VSC DTC is output)	C

   HINT: 

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

B → See step   6 

C → END 

A → INSPECT CAN COMMUNICATION SYSTEM