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ECU Power Source Circuit: Wiring Diagram

Fig 1: ECU Power Source - Wiring Diagram
G04065199Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. INSPECT FUSE (ECU-B2, DOOR) 
    1. Remove the ECU-B2 fuse from the cowl side junction block LH.
    2. Remove the DOOR fuse from the cowl side junction block RH.
    3. Measure the resistance of the fuses.

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go To Next Step 

  2. CHECK WIRE HARNESS (BODY ECU (MAIN) - BATTERY) 
    1. Disconnect the 2C and 2Q junction block connectors.
    2. Measure the voltage of the wire harness side connectors.

    Standard voltage 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    2Q-22 (BECU) - Body ground 10 to 14 V
    2C-1 (BDR1) - Body ground 10 to 14 V

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE 

    NG: Go To Next Step 

  3. CHECK WIRE HARNESS (BODY ECU (MAIN) - BODY GROUND) 

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE 

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