Power Steering ECU Communication Stop Mode (07/2015 -): Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the c1 power steering ECU with motor assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   c1-7 (CANH) - c1-8 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

Result:  NG

NG 

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

Result:  OK

OK 

See step  2

1. Disconnect the c2 power steering ECU with motor assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   c2-2 (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 with Motor Assembly)

3. Reconnect the cable to the negative (-) battery terminal.
4. 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
   c1-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

Result:  OK

OK 

REPLACE POWER STEERING ECU WITH MOTOR ASSEMBLY 

(Refer to REMOVAL (07/2015 -) )

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)