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Terminals Of Ecu

  1. CHECK ECM (3GR-FSE) 
    Fig 1: Identifying ECM (3GR-FSE)
    G04023094Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of each terminal of the connectors.
      SYMBOLS WIRING COLOR CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +BM (E8-5) - E1 (E7-7) P - BR Power supply Engine switch on (IG) 10 to 14 V
      BATT (A6-4) - E1 (E7-7) L - BR Power supply Always 10 to 14 V
      +B1 (A6-5) - E1 (E7-7) B-R - BR Power supply Engine switch on (IG) 10 to 14 V
      +B (A6-6) - E1 (E7-7) B-R - BR Power supply Engine switch on (IG) 10 to 14 V
      IGSW (A6-17) - E1 (E7-7) B-W - BR Ignition power supply Engine switch on (IG) Below 1 V
      IGSW (A6-17) - E1 (E7-7) B-W - BR Ignition power supply Engine switch off 10 to 14 V
      RDEF (A7-13) - E1 (E7-7) G-B - BR DEFOG relay Engine switch on (IG)
      Rear defogger switch ON      		 Below 1 V
      RDEF (A7-13) - E1 (E7-7) G-B - BR DEFOG relay Engine switch on (IG)
      Rear defogger switch OFF      		 10 to 14 V
      ME01 (E8-4) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E1 (E7-7) - Body ground BR - Body ground Ground Always Below 1 Ω
      E02 (E6-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E01 (E6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      EC (A6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, the ECM may have a malfunction.

  2. CHECK ECM (3UZ-FE) 
    Fig 2: Identifying ECM (3Uz-Fe)
    G04023095Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of each terminal of the connectors.
      SYMBOLS WIRING COLOR CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +BM (E8-5) - E1 (E7-7) P - BR Power supply Engine switch on (IG) 10 to 14 V
      BATT (A6-4) - E1 (E7-7) L - BR Power supply Always 10 to 14 V
      +B1 (A6-5) - E1 (E7-7) B-R - BR Power supply Engine switch on (IG) 10 to 14 V
      +B (A6-6) - E1 (E7-7) B-R - BR Power supply Engine switch on (IG) 10 to 14 V
      IGSW (A6-17) - E1 (E7-7) B-W - BR Ignition power supply Engine switch on (IG) Below 1 V
      IGSW (A6-17) - E1 (E7-7) B-W - BR Ignition power supply Engine switch off 10 to 14 V
      RDEF (A7-13) - E1 (E7-7) G-B - BR DEFOG relay Engine switch on (IG)
      Rear defogger switch ON      		 Below 1 V
      RDEF (A7-13) - E1 (E7-7) G-B - BR DEFOG relay Engine switch on (IG)
      Rear defogger switch OFF      		 10 to 14 V
      ME01 (E8-4) - Body ground BR - Body ground Ground Always Below 1 Ω
      E1 (E7-7) - Body ground BR - Body ground Ground Always Below 1 Ω
      E02 (E6-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E01 (E6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      EC (A6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, the ECM may have a malfunction.

  3. CHECK A/C AMPLIFIER ASSEMBLY (A/C ECU) 
    Fig 3: Identifying A/C Amplifier Assembly (A/C ECU)
    G04023096Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K52 amplifier connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      SYMBOLS WIRING COLOR CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG+ (K52-21) - GND (K52- 20) W - W-B Ignition power supply Engine switch on (IG) 10 to 14 V
      IG+ (K52-21) - GND (K52- 20) W - W-B Ignition power supply Engine switch off Below 1 V
      B (K52-1) - GND (K52-20) L - W-B Battery power supply Always 10 to 14 V
      GND (K52-20) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

  4. CHECK MULTI-DISPLAY 
    Fig 4: Identifying K46 Multi-Display Connector
    G04023097Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K46 multi-display connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      SYMBOLS WIRING COLOR CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (K46-3) - GND1 (K46- 10) B - W-B Ignition power supply Engine switch on (IG) 10 to 14 V
      IG (K46-3) - GND1 (K46- 10) B - W-B Ignition power supply Engine switch off Below 1 V
      +B (K46-1) - GND1 (K46- 10) O - W-B Battery power supply Always 10 to 14 V
      GND1 (K46-10) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

  5. CHECK IGNITION CONTROL ECU ASSEMBLY 
    Fig 5: Identifying K73 ECU Connector
    G04023098Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K73 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      SYMBOLS WIRING COLOR CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AM1 (K73-33) - Body ground O - Body ground +B power supply Always 10 to 14 V
      GND2 (K73-6) - Body ground W-B - Body ground Ground Always Below 1 Ω

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the K73 ECU connector.
    4. Measure the voltage of the connector.
      SYMBOLS WIRING COLOR CHART

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG1D (K73-34) - GND2 (K73-6) SB - W-B IG1 control signal Engine switch on (ACC) Below 1 V
      IG1D (K73-34) - GND2 (K73-6) SB - W-B IG1 control signal Engine switch off 10 to 14 V

      If the result is not as specified, the ECU may have a malfunction.

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