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ECU Power Source Circuit: Procedure

  1. CHECK FUSE (D-IG1-2) 
    1. Remove the D-IG1-2 fuse from the main body ECU.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      D-IG1-2 fuse Always Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU - BATTERY AND BODY GROUND) 
    Fig 1: Identifying A33 ECU Connector Terminals
    GTY265514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A33 ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      A33-13 (B) - Body ground Engine switch on (IG) 11 to 14 V
      A33-13 (B) - Body ground Engine switch off Below 1 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      A33-25 (GND) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   3 

  3. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
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