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Terminals Of Ecu

  1. CHECK ENGINE SWITCH 
    Fig 1: Identifying Engine Switch Connector
    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.
      ECU TERMINAL REFERENCE

      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.
      ECU TERMINAL REFERENCE

      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  e waveform 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  f waveform 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 1 REFERENCE

      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 Graph 1
      G04944570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM 2 REFERENCE

      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 Graph 2
    G04944574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Identifying Certification ECU Connector
    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.
      ECU TERMINAL REFERENCE

      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.
      ECU TERMINAL REFERENCE

      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  e waveform 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  f waveform 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 1 REFERENCE

      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 Graph 1
      G04944570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM 2 REFERENCE

      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 Graph 2
    G04944574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK ID CODE BOX (IMMOBILIZER CODE ECU) 
    Fig 7: Identifying ID Code Box (Immobilizer Code ECU) Connector
    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.
      ECU TERMINAL REFERENCE

      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.
      ECU TERMINAL REFERENCE

      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  e waveform 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  f waveform 2)

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

    5. Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM 1 REFERENCE

      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 Graph 1
      G04944576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM 2 REFERENCE

      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 Graph 2
    G04944577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) 
    Fig 10: Identifying Main Body ECU (Cowl Side Junction Block LH) Connector Terminals
    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.
      ECU TERMINAL REFERENCE

      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 (Steering Lock ECU) Connector Terminals
    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.
      ECU TERMINAL REFERENCE

      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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