Certification ECU Power Source Circuit: Procedure

1. Disconnect the D39 certification ECU connector.
   Fig 1: Identifying D39 Certification ECU Connector Terminals

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2. Measure the voltage according to the value(s) in the table below.

   Voltage

   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.

   Resistance

   Tester Connection	Condition	Specified Condition
   D39-17 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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