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Gateway ECU Power Source Circuit: Wiring Diagram

Fig 1: Identifying Gateway ECU Power Source Wiring Diagram
G04065402Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. INSPECT FUSE (ACC, ECU-B2, ECU-IG1) 
    1. Remove the ACC, ECU-IG1 fuses from the cowl side junction block LH.
    2. Remove the ECU-B2 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 (NETWORK GATEWAY ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the G5 ECU connector.
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      G5-24 (GND) - Body ground Below 1 Ω
    3. Measure the voltage of the wire harness side connector.
    Fig 2: Identifying G5 ECU Connector
    G04065403Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard voltage 

    TESTER CONNECTION AND SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    G5-10 (BATT) - G5-24 (GND) Always 10 to 14 V
    G5-2 (ACC) - G5-24 (GND) Ignition switch ACC 10 to 14 V
    G5-1 (IG) - G5-24 (GND) Ignition switch ON 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM TABLE 

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