Power Steering ECU Communication Stop Mode: Procedure

1. Turn the ignition switch off.
2. Disconnect the power steering ECU connector.
   Fig 1: Identifying Power Steering ECU E51 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

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

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   E51-1 (CANH) - E51-7 (CANL)	Ignition switch off	54 to 69 Ω

NG → REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (POWER STEERING ECU BRANCH WIRE) 

OK: Go to next step 

1. Disconnect the power steering ECU connectors.
   Fig 2: Identifying Power Steering ECU A23 & E51 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A23-2 (PGND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A23-1 (PIG) - Body ground	Always	10 to 14 V
   E51-6 (IG) - Body ground	Ignition switch ON	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3