Inspection Procedure

1. Disconnect the A31 ECU connector.
2. Measure the voltage of the wire harness side connector.

   Standard voltage 

   VOLTAGE SPECIFIED CONDITIONS
   
   

   Tester Connection	Switch Condition	Specified Condition
   A31-2 (IG) - Body ground	Ignition switch ON	10 to 14 V
   A31-2 (IG) - Body ground	Ignition switch OFF	Below 1 V

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

   Standard resistance 

   RESISTANCE SPECIFIED CONDITIONS
   
   

   Tester Connection	Specified Condition
   A31-1 (E1) - Body ground	Below 1 Ω

   Fig 1: Identifying A31 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE