Power Steering ECU Communication Stop Mode [08/2013 - ]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the E40 power steering ECU assembly connector.
3. Measure the resistance 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 Resistance

   Tester Connection	Condition	Specified Condition
   E40-7 (CANH) - E40-8 (CANL)	Cable disconnected from negative (-) 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 A25 power steering ECU assembly connector.
2. Measure the resistance 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 Resistance

   Tester Connection	Condition	Specified Condition
   A25-2 (PGND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

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

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E40-1 (IG) - Body ground	Ignition switch ON	11 to 14 V

Result: 

OK 

REPLACE POWER STEERING ECU ASSEMBLY. Refer to  REMOVAL [08/2013 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)