Power Steering ECU Communication Stop Mode [11/2016 - ]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the p1 power steering ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   p1-4 (CANH) - p1-8 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

Result: 

NG 

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

Result: 

OK 

See step  2

1. Disconnect the p2 power steering ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   p2-2 (PGND) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

3. Reconnect the cable to the negative (-) auxiliary battery terminal.
4. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   p1-1 (IG) - Body ground	Power switch on (IG)	11 to 14 V

Result: 

OK 

REPLACE POWER STEERING ECU ASSEMBLY. Refer to  REMOVAL [02/2014 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)