Power Steering ECU Communication Stop Mode [06/2016 - ]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the A14 and A15 power steering ECU assembly connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A15-1 (CANH) - A15-7 (CANL)	Cable disconnected from negative (-) battery terminal	57 to 63 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Power Steering ECU Assembly)

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (POWER STEERING ECU ASSEMBLY) 

Result: 

OK 

See step  2

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A14-2 (PGND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Power Steering ECU Assembly)

2. Connect the cable to the negative (-) battery terminal.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A14-1 (PIG) - Body ground	Ignition switch off	11 to 14 V
   A15-6 (IG) - Body ground	Ignition switch ON	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Power Steering ECU Assembly)

Result: 

OK 

REPLACE POWER STEERING ECU ASSEMBLY 

(Refer to REMOVAL [06/2016 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)