Inspection Procedure

1. Remove the SECURITY fuse from the main body ECU RH.
2. Measure the resistance of the fuse.

   Standard resistance: Below 1 Ω 

NG: REPLACE FUSE 

OK: Go to next step 

1. Disconnect the U28 ECU connector.
2. Measure the resistance and voltage of the wire harness side connector.

   Standard resistance 

   STANDARD RESISTANCE REFERENCE
   
   

   Tester Connection	Specified Condition
   U28-17 (E) - Body ground	Below 1 Ω

   Standard voltage 

   VOLTAGE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   U28-1 (+B1) - Body ground	10 to 14 V

Fig 1: Identifying U28 ECU Connector Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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