Inspection Procedure

1. Check that the key cancel function is set.

   OK: Key cancel function is set. 

OK: END (UNSET KEY CANCEL FUNCTION) 

NG: GO TO Next Step 

1. Remove the SECURITY and ECU-IG RH fuses 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 voltage and resistance of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester Connection	Condition	Specified Condition
   U28-18 (IG) - Body ground	Power switch OFF	Below 1 V
   U28-18 (IG) - Body ground	Power switch ON (IG)	10 to 14 V
   U28-1 (+B1) - Body ground	Always	10 to 14 V

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

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

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE CERTIFICATION ECU