Inspection Procedure

1. Remove the IG2 fuse from the instrument panel junction block.
2. Remove the ECU-B, DCC and AM2 fuses from the engine room relay block.
3. Measure the resistance of the fuses.

   Standard resistance: 

   Below 1 Ω 

NG: REPLACE FUSE 

OK: Go to next step 

1. Disconnect the T8 ECU connector.
2. Measure the resistance and voltage of the wire harness and connector.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   T8-14 (GND) - Body ground	Below 1 Ω

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   T8-2 (IG) - Body ground	Ignition switch OFF	Below 1 V
   	Ignition switch ON	10 to 14 V
   T8-1 (+B) - Body ground	Always

   Fig 1: Identifying T8 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: REPLACE TRANSPONDER KEY ECU ASSEMBLY