Inspection Procedure

1. Disconnect the G1 gateway ECU connector.
2. Measure the resistance of the wire harness side connector.

   Standard resistance 

   TESTER CONNECTION - SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   G1-17 (CA1H) - G1-18 (CA1L)	Power switch OFF	54 to 69 Ω

   Fig 1: Checking CAN Bus Line For Disconnection (Gateway ECU Branch Wire)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE GATEWAY ECU BRANCH WIRE AND CONNECTOR (CA1H, CA1L) 

OK : GO TO NEXT STEP 

1. Measure the resistance of the wire harness side connector.

   Standard resistance 

   TESTER CONNECTION - SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   G1-24 (GND) - Body ground	Below 1 Ω

2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION - SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Condition
   G1-10 (BATT) - Body ground	Always	10 to 14 V
   G1-2 (ACC) - Body ground	Power switch ON (ACC)	10 to 14 V
   G1-1 (IG) - Body ground	Power switch ON (IG)	10 to 14 V

   Fig 2: Checking Wire Harness (Gateway ECU - Battery And Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK : REPLACE GATEWAY ECU