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Terminals Of Ecu

  1. CHECK ENGINE SWITCH 
    Fig 1: Identifying Terminals Of ECU
    G04944569Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L36 switch connector.
    2. Measure the resistance according to the value(s) in the table below.
      CONNECTOR TERMINAL RESISTANCE SPECIFICATION

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L36-5 (GND) - Body ground 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 L36 switch connector.
    4. Measure the resistance according to the value(s) in the table below.
      CONNECTOR TERMINAL RESISTANCE SPECIFICATION

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L36-8 (AGND) - Body ground L - Body ground Ground Always Below 1 Ω
      L36-14(VC5)-L36-8 (AGND) V-L Power supply Key is not in cabin Below 1 V
      Press engine switch* 4.6 to 5.4 V
      L36-10(CODE)-L36-8 (AGND) W-L Demodulated signal of key code data Key is not in cabin Below 1 V
      Press engine switch and hold key close to engine switch* Pulse generation (see WAVEFORM 1 )
      L36-9 (TXCT) - L36-8 (AGND) O-L Key code output signal Key is not in cabin Below 1 V
      Press engine switch and hold key close to engine switch* Pulse generation (see WAVEFORM 2 )
      HINT:
      *: Remove the key's battery before performing this inspection.

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

    5. Using an oscilloscope, check the waveform 1.

      Waveform 1 (Reference): 

      WAVEFORM REFERENCE 1

      Item Content
      Terminal No. (Symbols) L36-10 (CODE) - L36-8 (AGND)
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Press engine switch and hold key close to engine switch*
      HINT:
      *: Remove the key's battery before performing this inspection.
      Fig 2: Waveform Graph 1
      G04944570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check the waveform 2.

      Waveform 2 (Reference): 

      WAVEFORM REFERENCE 2

      Item Content
      Terminal No. (Symbols) L36-9 (TXCT) - L36-8 (AGND)
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Press engine switch and hold key close to engine switch*
      HINT:
      *: Remove the key's battery before performing this inspection.
  2. CHECK CERTIFICATION ECU 
    Fig 3: Waveform Graph 2
    G04944571Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Identifying L15 And L16 ECU Connector Terminal
    G04944572Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L15 ECU connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      RESISTANCE AND VOLTAGE OF L15 ECU CONNECTOR DISCONNECTED

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L15-17 (E)- Body ground W-B - Body ground Ground Always Below 1 Ω
      L15-1 (+B1)-L15-17(E) L-W-B +B power supply Always 11 to 14 V
      L15-18 (IG)-L15-17(E) L-W-B Ignition power supply Engine switch off Below 1 V

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

    3. Reconnect the L15 ECU connector.
    4. Measure the resistance and voltage according to the value(s) in the table below.
      RESISTANCE AND VOLTAGE OF L15 ECU CONNECTOR RECONNECTED

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L15-40 (AGND)-Body ground L - Body ground engine switch ground Always Below 1 Ω
      L15-30 (VC5)-L15-40 (AGND) V-L Engine switch power supply Key is not in cabin Below 1 V
      Press engine switch* 4.6 to 5.4 V
      L15-9 (CODE) -L15-40 (AGND) W-L Engine switch CODE input Key is not in cabin Below 1 V
      Press engine switch and hold key close to engine switch* Pulse generation (see WAVEFORM 1 )
      L15-8 (TXCT)-L15-40 (AGND) O-L Engine switch TX output Key is not in cabin Below 1 V
      Press engine switch and hold key close to engine switch* Pulse generation (see WAVEFORM 2 )
      HINT:
      *: Remove the key's battery before performing this inspection.

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

    5. Using an oscilloscope, check the waveform 1.

      Waveform 1 (Reference): 

      WAVEFORM REFERENCE 1

      Item Content
      Terminal No. (Symbols) L15-9 (CODE) - L15-40 (AGND)
      Tool Setting 2 V/DIV., 20 msec./DIV.
      Condition Press engine switch and hold key close to engine switch*
      HINT:
      *: Remove the key's battery before performing this inspection.
      Fig 5: Waveform Graph 1
      G04944570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check the waveform 2.

      Waveform 2 (Reference): 

      WAVEFORM REFERENCE 2

      Item Content
      Terminal No. (Symbols) L15-8 (TXCT) - L15-40 (AGND)
      Tool Setting 2 V/DIV., 20 msec/DIV.
      Condition Press engine switch and hold key close to engine switch*
      HINT:
      *: Remove the key's battery before performing this inspection.
      Fig 6: Waveform Graph 2
      G04944574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ID CODE BOX 
    Fig 7: Identifying L32 ID Code Box Connector Terminal
    G04944575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L32 box connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTOR TERMINAL RESISTANCE SPECIFICATION L32 DISCONNECTED

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L32-8 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L32-1 (+B) - L32-8 (GND) L-W-B +B power supply Always 11 to 14 V

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

    3. Reconnect the L32 ECU connector.
    4. Measure the voltage according to the value(s) in the table below.
      CONNECTOR TERMINAL VOLTAGE SPECIFICATION L32 ECU RECONNECTED

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L32-5 (EFII) - L32-8 (GND) B-W-B ECM input signal Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation (see WAVEFORM 1 )
      L32-6 (EFIO) - L32-8 (GND) L-W-B ECM output signal Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation (see WAVEFORM 2 )

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

    5. Using an oscilloscope, check the waveform 1.

      Waveform 1 (Reference): 

      WAVEFORM REFERENCE 1

      Item Content
      Terminal No. (Symbols) L32-5 (EFII) - L32-8 (GND)
      Tool Setting 10V/DIV., 100msec./DIV.
      Condition Engine switch on (IG)
      Fig 8: Waveform Graph 1
      G04944576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check the waveform 2.

      Waveform 2 (Reference): 

      WAVEFORM REFERENCE 2

      Item Content
      Terminal No. (Symbols) L32-6 (EFIO) - L32-8 (GND)
      Tool Setting 10V/DIV., 100 msec./DIV.
      Condition Engine switch on (IG)
      Fig 9: Waveform Graph 2
      G04944577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK) 
    Fig 10: Identifying Main Body ECU (Driver Side Junction Block)
    G04943821Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the DA and DF ECU connectors.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTOR TERMINAL RESISTANCE SPECIFICATION

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      DA-40 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      DA-41 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      DF-1 (ACC) - DA-40 (GND2) B-W-B ACC power supply Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V
      DF-1 (IG) - DA-40 (GND2) B-W-B IG power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

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

  5. CHECK STEERING LOCK ACTUATOR (STEERING LOCK ECU) 
    Fig 11: Identifying L33 ECU Connector Terminal
    G04944579Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L33 ECU connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTOR TERMINAL RESISTANCE SPECIFICATION L33 ECU DISCONNECTED

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L33-2 (SGND) - Body ground BR - Body ground Ground Always Below 1 Ω
      L33-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L33-7 (B) - Body ground P - Body ground +B power supply Always 11 to 14 V
      L33-6 (IG2) - Body ground L - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

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

  6. CHECK ECM 
    Fig 12: Identifying ECM Connector Terminal
    G04944580Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTOR TERMINAL RESISTANCE SPECIFICATION ECM

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      E3-1 (E1)- Body ground W-B - Body ground Ground Always Below 1 Ω
      E2-2 (E01) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E2-1 (E02) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A13-5(E03)-Body ground W-B - Body ground Ground Always Below 1 Ω
      E3-4 (E04) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A14-1 (EC) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E2-5(ME01)-Body ground W-B - Body ground Ground Always Below 1 Ω
      A14-7(BATT)-E3-1 (E1) B-W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
      A13-2(+B)-E3-1 (E1) B-W - W-B Power source of ECM Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A13-1 (+B1)-E3-1 (E1) B-W - W-B Power source of ECM Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A13-31 (IMI) - E3-1 (E1) L-W-B ID code box input signal Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation (see WAVEFORM 1 )
      A13-30(IMO)-E3-1 (E1) B-W-B ID code box output signal Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation (see WAVEFORM 2 )
    2. Using an oscilloscope, check the waveform 1.

      Waveform 1 (Reference): 

      WAVEFORM REFERENCE 1

      Item Content
      Terminal No. (Symbols) A13-31 (IMI)- E3-1 (E1)
      Tool Setting 10V/DIV., 100 msec./DIV.
      Condition Engine switch on (IG)
      Fig 13: Waveform Graph 1
      G04944581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using an oscilloscope, check the waveform 2.

      Waveform 2 (Reference): 

      WAVEFORM REFERENCE 2

      Item Content
      Terminal No. (Symbols) A13-30(IMO)-E3-1 (E1)
      Tool Setting 10V/DIV., 100 msec/DIV.
      Condition Engine switch on (IG)
      Fig 14: Waveform Graph 2
      G04944582Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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