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 

   T8 ECU CONNECTOR STANDARD RESISTANCE SPECIFICATIONS
   
   

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

   Standard voltage 

   T8 ECU CONNECTOR STANDARD VOLTAGE SPECIFICATIONS
   
   

   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

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 1: Identifying T8 ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE TRANSPONDER KEY ECU ASSEMBLY