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Terminals Of Ecu

  1. CHECK ENGINE SWITCH 
    Fig 1: Identifying Engine Switch Connector Terminal E18
    G05631029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E18 switch connector.
    2. Measure the resistance according to the value(s) in the table below.
      CONNECTORS TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E18-5 (GND) - Body ground BR - 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 E18 switch connector.
    4. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTORS TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E18-8 (AGND) - Body ground L - Body ground Ground Always Below 1 Ω
      E18-14 (VC5) - E18-8 (AGND) P - L Power supply Key not in cabin Below 1 V
      Engine switch pressed* 4 6 to 5.4 V
      E18-10 (CODE) - E18-8 (AGND) G - L Demodulated signal of key code output Key not in cabin Below 1 V
      Engine switch pressed and key held close to engine switch* Pulse generation (see  ewaveform 1)
      E18-9 (TXCT) - E18-8 (AGND) SB - L Key code input signal Key not in cabin Below 1 V
      Engine switch pressed and key held close to engine switch* Pulse generation (see  fwaveform 2)
      HINT:
      *: Remove the key battery before performing this inspection.

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

    5. Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Terminal No (Symbol) E18-10 (CODE) - E18-8 (AGND)
      Tool Setting 2 V/DIV., 20 msec /DIV
      Condition Engine switch pressed and key held close to engine switch*
      HINT:
      *: Remove the key battery before performing this inspection
      Fig 2: Identifying Waveform 1
      G04944570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Terminal No (Symbol) E18-9 (TXCT) - E18-8 (AGND)
      Tool Setting 2 V/DIV, 20 msec /DIV
      Condition Engine switch pressed and key held close to engine switch*
      HINT:
      *: Remove the key battery before performing this inspection.
  2. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    Fig 3: Identifying Waveform 1
    G04944574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Identifying Smart Key ECU Assembly Connector Terminal E29 And E30
    G05631032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E29 ECU connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTORS TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E29-17 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E29-1 (+B) - E29-17 (E) B - W-B +B power supply Always 11 to 14 V
      E29-18 (IG) - E29-17 (E) B - W-B 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

    3. Reconnect the E29 ECU connector.
    4. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTORS TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E29-40 (AGND) - Body ground L - Body ground Engine switch ground Always Below 1 Ω
      E29-30 (VC5) - E29-40 (AGND) P - L Engine switch power supply Key not in cabin Below 1 V
      Engine switch pressed* 4 6 to 5 4 V
      E29-9 (CODE) - E29-40 (AGND) G - L Engine switch CODE input Key not in cabin Below 1 V
      Engine switch pressed and key held close to engine switch* Pulse generation (see  ewaveform 1)
      E29-8 (TXCT) - E29-40 (AGND) SB - L Engine switch TX output Key not in cabin Below 1 V
      Engine switch pressed and key held close to engine switch* Pulse generation (see  fwaveform 2)
      HINT:
      *: Remove the key battery before performing this inspection.

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

    5. Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Terminal No (Symbol) E29-9 (CODE) - E29-40 (AGND)
      Tool Setting 2 V/DIV, 20 msec./DIV
      Condition Engine switch pressed and key held close to engine switch*
      HINT:
      *: Remove the key battery before performing this inspection.
      Fig 5: Identifying Waveform 1 (Reference)
      G04944570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Terminal No (Symbol) E29-8 (TXCT) - E29-40 (AGND)
      Tool Setting 2 V/DIV, 20 msec /DIV
      Condition Engine switch pressed and key held close to engine switch*
      HINT:
      *: Remove the key battery before performing this inspection.
      Fig 6: Identifying Waveform 2 (Reference)
      G04944574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ID CODE BOX (IMMOBILIZER CODE ECU) 
    Fig 7: Identifying Immobilizer Code ECU Connector Terminal E28
    G05631035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E28 box connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTORS TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E28-8 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E28-1 (+B) - E28-8 (GND) B - 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 E28 box connector.
    4. Measure the voltage according to the value(s) in the table below
      CONNECTORS TERMINAL REFERENCE CHART

      Terminal No (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E28-5 (EFII) - E28-8 (GND) W - W-B ECM input signal Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation (see  ewaveform 1)
      E28-6 (EFIO) - E28-8 (GND) R - W-B ECM output signal Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation (see  fwaveform 2)

      If the result is not as specified, the ID code box (immobilizer code ECU) may have a malfunction.

    5. Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Terminal No (Symbol) E28-5 (EFII) - E28-8 (GND)
      Tool Setting 10 V/DIV, 100 msec/DIV
      Condition Engine switch on (IG)
      Fig 8: Identifying Waveform 1 (Reference)
      G04944576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Terminal No (Symbol) E28-6 (EFIO) - E28-8 (GND)
      Tool Setting 10 V/DIV, 100 msec./DIV
      Condition Engine switch on (IG)
      Fig 9: Identifying Waveform 2 (Reference)
      G04944577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) 
    Fig 10: Identifying Main Body ECU Connector Terminal (Cowl Side Junction Block LH)
    G05631037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 2D and 2A ECU connectors
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTORS TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      2D-62 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      2D-8 (ACC) - 2D-62 (GND2) GR - W-B ACC power supply Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V
      2A-1 (IG) - 2D-62 (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 Steering Lock Actuator Connector Terminal E26
    G05631038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E26 ECU connector.
    2. Measure the resistance and voltage according to the value(s) in the table below.
      CONNECTORS TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E26-2 (SGND) - Body ground BR - Body ground Ground Always Below 1 Ω
      E26-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E26-7 (B) - Body ground R - Body ground +B power supply Always 11 to 14 V
      E26-6 (IG2) - Body ground B - 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.

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