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

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   U28-18 (IG) - Body ground	Engine switch off	Below 1 V
   U28-18 (16) - Body ground	Engine switch on (IG)	10 to 14 V
   U28-1 (+B1) - Body ground	Always	10 to 14 V

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

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

   Fig 1: Identifying Terminals Of U28 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK : REPLACE CERTIFICATION ECU ASSEMBLY