Inspection Procedure

1. Disconnect the G4 gateway ECU connector.
2. Measure the resistance of the wire harness side connector.

   Standard resistance 

   GATEWAY ECU - BATTERY AND BODY GROUND (RESISTANCE)
   
   

   Tester Connection	Condition	Specified Condition
   G4-24 (GND) - Body ground	Always	Below 1 Ω

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

   Standard voltage 

   GATEWAY ECU - BATTERY AND BODY GROUND (VOLTAGE)
   
   

   Tester Connection	Condition	Specified Condition
   G4-10 (BATT) - Body ground	Always	10 to 14 V
   G4-2 (ACC) - Body ground	Ignition switch ON	10 to 14 V
   G4-1 (IG) - Body ground	Ignition switch ON	10 to 14 V

   Fig 1: Checking Wire Harness (Gateway ECU - Battery & Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE GATEWAY ECU