Inspection Procedure

1. Disconnect the D39 certification ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Voltage 

   VOLTAGE REFERENCE CHART
   
   

   Tester Connection	Condition	Specified Condition
   D39-1 (+B1) - Body ground	Always	10 to 14 V
   D39-18 (IG) - Body ground	Engine switch OFF → ON (IG)	Below 1 V → 10 to 14 V
   D39-19 (ACC) - Body ground	Engine switch OFF → ON (ACC)	Below 1 V → 10 to 14 V

3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying D39 Certification ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Resistance 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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