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Certification ECU Power Source Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Wiring Diagram - Certification ECU Power Source
G04049920Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    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
      G04049921Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    STANDARD RESISTANCE SPECIFICATION

    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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