DTC U0123: Lost Communication with Yaw Rate Sensor Module [09/2015 - ]: Procedure

Result:  NEXT

NEXT 

See step  2

1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.
   WARNING:

   Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

   NOTE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [09/2015 - ] ).

Result:  NEXT

NEXT 

See step  3

1. Disconnect the yaw rate sensor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   L71-3 (CANH) - L71-2 (CANL)	Engine switch off	54 to 69 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Yaw Rate Sensor)

Result:  NG

NG 

REPAIR OR REPLACE YAW RATE SENSOR CAN BRANCH WIRE OR CONNECTOR (CANH, CANL) 

Result:  OK

OK 

See step  4

1. Connect the cable to the negative (-) battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NOTE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [09/2015 - ] ).

2. Measure the voltage according to the value(s) in table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   L71-4 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L71-1 (GND) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Yaw Rate Sensor)

Result:  OK

OK 

REPLACE YAW RATE SENSOR 

(Refer to REMOVAL [09/2015 - ] )

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR