Inspection Procedure

1. Turn the engine switch off.
2. Disconnect the steering control ECU connector (K70).
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Value
   K70-9 (CANH) - K70-20 (CANL)	Engine switch off	54 to 69 Ω

Fig 1: Identifying Steering Control ECU Connector (K70)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE STEERING CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 

OK: Go to next step 

1. Reconnect the steering control ECU connector (K70).
2. Disconnect the steering control ECU connector (A40).
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Value
   A40-7 (PGND) - Body ground	Always	Below 1 Ω

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

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Value
   A40-3 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

Fig 2: Identifying Steering Control ECU A40 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE STEERING CONTROL ECU