Certification ECU Power Source Circuit: Wiring Diagram

1. Disconnect the P33 certification ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection (Symbols)	Condition	Specified Condition
   P33-1 (+B1) - Body ground	Always	10 to 14 V
   P33-18 (IG) - Body ground	Engine switch OFF	Below 1 V
   	Engine switch ON (IG)	10 to 14 V
   P33-19 (ACC) - Body ground	Engine switch OFF	Below 1 V
   	Engine switch ON (ACC)	10 to 14 V

   Fig 2: Identifying P33 Certification ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

Standard resistance 

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

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