Power Steering ECU Communication Stop Mode [10/2018 - 07/2022]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the power steering ECU with motor assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F56-7 (CANH) - F56-8 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (POWER STEERING ECU WITH MOTOR 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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F55-2 (PGND) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   F56-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

   Result

   Result	Proceed to
   OK (for Manual Tilt and Manual Telescopic Steering Column)	A
   OK (for Power Tilt and Power Telescopic Steering Column)	B
   NG	C

Result: 

A 

REPLACE POWER STEERING ECU ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022] 

Result: 

B 

REPLACE POWER STEERING ECU ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022] 

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)