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Terminals Of Ecu

  1. CHECK TRANSPONDER KEY AMPLIFIER 
    1. Disconnect the E72 amplifier connector and measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying E72 Amplifier Connector
      G05580363Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL DESCRIPTION

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E72-7 (AGND) - Body ground L - Body ground Ground Always Below 1 Ω

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

    2. Reconnect the E72 amplifier connector and measure the voltage according to the value(s) in the table below.
      TERMINAL DESCRIPTION

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E72-1 (VC5) - E72-7 (AGND) GR-R - L Power source No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder 4.6 to 5.4 V
      E72-4 (CODE) - E72-7 (AGND) P-G-L Demodulated signal of key code data No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform 1
      E72-5 (TXCT) - E72-7 (AGND) LG-R - L Key code output signal No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform 2

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

    3. Inspect using an oscilloscope.
      1. Waveform 1
        WAVEFORM 1 REFERENCE

        Tester Connection E72-4 (CODE) - E72-7 (AGND)
        Tool Setting 2V/DIV., 20ms./DIV.
        Condition Key is in ignition key cylinder
        Fig 2: Waveform 1 Graph (Reference)
        G04979967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2
        WAVEFORM 2 REFERENCE

        Tester Connection E72-5 (TXCT) - E72-7 (AGND)
        Tool Setting 2 V/DIV., 10 ms./DIV.
        Condition Key is in ignition key cylinder
        Fig 3: Waveform 2 Graph (Reference)
        G04979968Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK TRANSPONDER KEY ECU 
    1. Disconnect the E73 ECU connector and measure the resistance and voltage according to the value(s) in the table below.
      Fig 4: Identifying E73 ECU Connector
      G05580366Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL DESCRIPTION

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E73-16 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E73-1 (+B) - E73-16 (GND) W-R - W-B Battery Always 11 to 14 V
      E73-2 (IG) - E73-16 (GND) B-O - W-B Ignition switch signal Ignition switch OFF Below 1 V
      Ignition switch ON 11 to 14 V
      E73-3 (KSW) - E73-16 (GND) G-Y - W-B Unlock warning switch signal No key is in ignition key cylinder 10 kΩ or higher
      Key is in ignition key cylinder Below 1 Ω

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

    2. Reconnect the E73 ECU connector and measure the resistance and voltage according to the value (s) in the table below.
      TERMINAL DESCRIPTION

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E73-5 (AGND) - Body ground L - Body ground Ground Always Below 1 Ω
      E73-3 (KSW) - E73-16 (GND) G-Y - W-B Unlock warning switch signal No key is in ignition key cylinder 11 to 14 V
      Key is in ignition key cylinder Below 1 V
      E73-14 (VC5) - E73-5 (AGND) GR-R - L Power source No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder 4.6 to 5.4 V
      E73-4 (TXCT) - E73-5 (AGND) LG-R - L Transponder key amplifier communication signal No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform 1
      (see step  1)
      E73-15 (CODE) - E73-5 (AGND) P-G-L Transponder key amplifier communication signal No key is in ignition key cylinder Below 1 V
      Key is in ignition key cylinder Waveform 2
      (see step  2)
      E73-13 (EFIO) - E73-16 (GND) W-R - W-B ECM output signal Ignition switch OFF Below 1 V
      Ignition switch ON Waveform 3
      (see step  3)
      E73-12 (EFII) - E73-16 (GND) L-O - W-B ECM input signal Ignition switch OFF Below 1 V
      Ignition switch ON Waveform 4
      (see step  4)
      E73-9 (D) - E73-16 (GND) R-Y - W-B Diagnostic tester communication Without communication Below 1 V
      During communication Pulse generation
      E73-7 (CTY) - E73-16 (GND) R-B - W-B Door courtesy signal Switch pushed 11 to 14 V
      Switch free Below 1 V
      E73-8 (IND) - E73-16 (GND) V-W - W-B Security indicator signal Security indicator light is on 11 to 14 V
      Security indicator light is off Below 1 V

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

    3. Inspect using an oscilloscope.
      1. Waveform 1
        WAVEFORM 1 REFERENCE

        Tester Connection E73-4 (TXCT) - E73-5 (AGND)
        Tool Setting 2V/DIV., 10ms./DIV.
        Condition Key is in ignition key cylinder
        Fig 5: Waveform 1 Graph (Reference)
        G04979968Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2
        WAVEFORM 2 REFERENCE

        Tester Connection E73-15 (CODE) - E73-5 (AGND)
        Tool Setting 2V/DIV., 20ms./DIV.
        Condition Key is in ignition key cylinder
        Fig 6: Waveform 2 Graph (Reference)
        G04979967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3
        WAVEFORM 3 REFERENCE

        Tester Connection E73-13 (EFIO) - E73-16 (GND)
        Tool Setting 2 V/DIV., 1 s./DIV.
        Condition Ignition switch ON
        Fig 7: Waveform 3 Graph (Reference)
        G04979972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Waveform 4
        WAVEFORM 4 REFERENCE

        Tester Connection E73-12 (EFII) - E73-16 (GND)
        Tool Setting 2 V/DIV, 1 s./DIV.
        Condition Ignition switch ON
        Fig 8: Waveform 4 Graph (Reference)
        G05419602Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ECM 
    1. Disconnect the E46 ECM connector and measure the resistance according to the value (s) in the table below.
      Fig 9: Identifying E46 ECM Connector
      G05580371Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL DESCRIPTION

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E46-35 (EOM) - 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.

    2. Reconnect the E46 ECM connector. Measure the voltage according to the value (s) in the table below.
      TERMINAL DESCRIPTION

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E46-16 (IMI) - E46-35 (EOM) W-R - W-B Transponder key ECU input signal Ignition switch OFF Below 1 V
      Ignition switch ON Waveform 1
      E46-15 (IMO) - E46-35 (EOM) L-O - W-B Transponder key ECU output signal Ignition switch OFF Below 1 V
      Ignition switch ON Waveform 2

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

    3. Inspect using an oscilloscope.
      1. Waveform 1
        WAVEFORM REFERENCE

        Tester Connection E46-16 (IMI) - E46-28 (EOM)
        Tool Setting 2 V/DIV, 1 s./DIV.
        Condition Ignition switch ON
        Fig 10: Waveform 1 Graph (Reference)
        G04979972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2
        WAVEFORM REFERENCE

        Tester Connection E46-15 (IMO) - E46-28 (EOM)
        Tool Setting 2 V/DIV., 1 s./DIV.
        Condition Ignition switch ON
        Fig 11: Waveform 2 Graph (Reference)
        G05419602Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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