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Certification ECU Power Source Circuit: Procedure

  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the P33 certification ECU connector.
      Fig 1: Identifying P33 Certification ECU Connector Terminal
      GTY119511Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      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
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection (Symbols) Condition Specified Condition
      P33-17 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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