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Terminals Of Ecu

  1. CHECK MAIN BODY ECU (INSTRUMENT PANEL J/B) 
    Fig 1: Identifying Main Body ECU Connector Terminals (Instrument Panel J/B)
    G05252660Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the DR, DA, DD, DF, E60, E61 and E59 ECU connectors.
    2. Measure the voltage and resistance of the wire harness side connector.
      VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AM1 (E61-6) - Body ground L - Body ground +B power supply Always 10 to 14 V
      AM2 (E60-1) - Body ground L - Body ground +B power supply Always 10 to 14 V
      SSW1 (E61-17) - Body ground L - Body ground Engine switch signal Engine switch pushed Below 1 Ω
      SSW1 (E61-17) - Body ground L - Body ground Engine switch signal Engine switch not pushed 10 kΩ or higher
      SSW2 (E61-16) - Body ground V - Body ground Engine switch signal Engine switch pushed Below 1 Ω
      SSW2 (E61-16) - Body ground V - Body ground Engine switch signal Engine switch not pushed 10 kΩ or higher
      GND3 (E59-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      LIN1 (DR-9) - Body ground O - Body ground LIN line Always 10 kΩ or higher
      BATB (DA-1) - Body ground W - Body ground +B Power supply Always 10 to 14 V
      GND1 (DF-10) - Body ground W-B - Body ground Ground Always Below 1 Ω
      CANN (E59-15) - Body ground W - Body ground CAN Line Always 10 kΩ or higher
      CANP (E59-16) - Body ground B - Body ground CAN Line Always 10 kΩ or higher
      CANH (E59-5) - Body ground BR - Body ground CAN Line Always 10 kΩ or higher
      CANL (E59-6) - Body ground GR - Body ground CAN Line Always 10 kΩ or higher
      IG (DF-11) - Body ground B - Body ground IG power supply Always 10 to 14 V
      ALTB (DD-16) - Body ground W - Body ground +B Power supply Always 10 to 14 V

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

    3. Reconnect the ECU connectors.
    4. Measure the voltage of the connector.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      ACC (DF-2) - Body ground L - Body ground ACC power supply Engine switch on (ACC) 10 to 14 V
      ACCD (E61-22) - GND3 (E59-1) R - W-B ACC signal Engine switch on (ACC) Output voltage at terminal AM1 or AM2 is -2V or more.
      ACCD (E61-22) - GND3 (E59-1) R - W-B ACC signal Engine switch off Below 1 V
      IG1D (E61 -3) - GND3 (E59-1) LG - W-B IG1 signal Engine switch on (IG) Output voltage at terminal AM1 or AM2 is -2V or more.
      IG1D (E61 -3) - GND3 (E59-1) LG - W-B IG1 signal Engine switch on (ACC) Below 1 V
      IG2D (E60-11) - GND3 (E59-1) O - W-B IG2 signal Engine switch on (IG) Output voltage at terminal AM1 or AM2 is -2V or more.
      IG2D (E60-11) - GND3 (E59-1) O - W-B IG2 signal Engine switch on (ACC) Below 1 V
      STP (DC-13) - GND3 (E59-1) W - W-B Stop light signal Brake pedal depressed Output voltage at terminal AM1 or AM2 is -2V or more.
      STP (DC-13) - GND3 (E59-1) W - W-B Stop light signal Brake pedal released Below 1 V
      SLR+ (E61-19) - GND3 (E59-1) BR - W-B Steering lock motor signal Steering lock motor operating Below 1 V
      SLR+ (E61-19) - GND3 (E59-1) BR - W-B Steering lock motor signal Steering lock motor does not operate Output voltage at terminal AM1 or AM2 is -2V or more.
      SLP (E61-18) - GND3 (E59-1) GR - W-B Steering lock actuator position signal Steering lock is locked Pulse generation (See  3waveform 3)
      SLP (E61-18) - GND3 (E59-1) GR - W-B Steering lock actuator position signal Steering lock is released Pulse generation (See  3waveform 3)
      SPD (E59-9) - GND3 (E59-1) SB - W-B Vehicle speed signal Engine switch on (IG), rotate rear wheel slowly Pulse generation (See  1waveform 1)
      TACH (E59-8) - GND3 (E59-1) B - W-B Tachometer signal Engine running Pulse generation (See  2waveform 2)
      P (E58-2) - GND3 (E59-1) G - W-B Shift lock signal Shift lever P position Output voltage at terminal AM1 or AM2 is -2V or more.
      P (E58-2) - GND3 (E59-1) G - W-B Shift lock signal Shift lever not P position Below 1 V
      ACCR (E60-3) - GND3 (E59-1) B - W-B Starter assist signal Brake pedal depressed, shift lever P position, engine switch is pushed once → on (IG) 0.1 to 0.8 V*1 → Output voltage at terminal AM1 or AM2 is -2 V or more.
      STSW (E58-4) - GND3 (E59-1) R - W-B Starter activation request signal Brake pedal depressed, engine switch held on (ST) Output voltage at terminal AM1 or AM2 is -2V or more.
      STR (E61-8) - GND3 (E59-1) G - W-B Park/neutral position switch Shift lever P or N position → except P or N position Below 1 V → Pulse generation
      STR2 (E58-6) - GND3 (E59-1) V - W-B Starter signal (Sub) Brake pedal depressed, shift lever P or N position, engine switch on (ST) Output voltage at terminal AM1 or AM2 is -3.5V or more.*2
      INDS (E61-15) - GND3 (E59-1) Y - W-B Vehicle condition signal Brake pedal depressed, shift lever P position. Output voltage at terminal AM1 or AM2 is -3V or more.
      INDW (E61-14) - GND3 (E59-1) GR - W-B Warning signal Brake pedal depressed, shift lever P position, engine switch on (ACC, IG) Output voltage at terminal AM1 or AM2 is -3 V or more.
      SWIL (E61-25) - GND3 (E59-1) R - W-B Illumination signal Light control switch TAIL or HEAD Output voltage at terminal AM1 or AM2 is -2V or more.
      HINT:
      *1: Voltage is output only when the engine is cranking.
      *2: Voltage is output for 0.3 seconds when the engine is cranking to start. Disconnect the B12 connector from the ECM before measuring the voltage.

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

    5. Using an oscilloscope, check the signal waveform of the ECU.
      1. Waveform 1

        Waveform 1 (Reference): 

        WAVEFORM REFERENCE (WAVEFORM 1)

        Terminal No. SPD (E59-9) - GND3 (E59-1)
        Tool Setting 5V/DIV., 10 ms./DIV.
        Vehicle Condition Driving at approx. 20 km/h (12 mph)

        HINT:

        As the vehicle speed increases, the wavelength shortens.

        Fig 2: Waveform Graph (Waveform 1)
        G04975562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2

        Waveform 2 (Reference): 

        WAVEFORM REFERENCE (WAVEFORM 2)

        Terminal No. TACH (E59-8) - GND3 (E59-1)
        Tool Setting 5V/DIV., 10 ms./DIV.
        Vehicle Condition Engine idling

        HINT:

        As the engine revolution speed increases, the wavelength shortens.

        Fig 3: Waveform Graph (Waveform 2)
        G04975563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Waveform 3

        Waveform 3 (Reference): 

        WAVEFORM REFERENCE (WAVEFORM 3)

        Terminal No. SLP (E61-18) - GND3 (E59-1)
        Tool Setting 2V/DIV., 100 ms./DIV.
        Vehicle Condition Steering lock/unlock
        Fig 4: Waveform Graph (Waveform 3)
        G04975564Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK CERTIFICATION ECU 
    Fig 5: Identifying Certification ECU Connector Terminals
    G05248810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E13 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B1 (E13-1) - Body ground W - Body ground +B power supply Always 10 to 14 V
      LIN (E13-10) - Body ground O - Body ground LIN line Always 10 kΩ or higher
      E (E13-17) - 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 E13 ECU connector.
    4. Measure the voltage of the connector.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG (E13-18) - Body ground LG - Body ground Ignition power supply Engine switch on (IG) 10 to 14 V
      IG (E13-18) - Body ground LG - Body ground Ignition power supply Engine switch off Below 1V

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

  3. CHECK ECM 
    Fig 6: Identifying ECM Connector Terminals
    G05248811Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the B12 and A10 ECM connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.
      VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (A10-2) - Body ground R - Body ground Power source of ECM Engine switch on (IG) 10 to 14 V
      +B2 (A10-1) - Body ground R - Body ground Power source of ECM Engine switch on (IG) 10 to 14 V
      IGSW (A10-28) - Body ground Y - Body ground Ignition switch signal Engine switch on (IG) 10 to 14 V
      E01 (B12-22) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E02 (B12-21) - Body ground B-W - Body ground Ground Always Below 1 Ω
      E03 (B12-104) - Body ground B - Body ground Ground Always Below 1 Ω
      E04 (B12-23) - Body ground W - Body ground Ground Always Below 1 Ω
      E05 (B12-46) - Body ground W - Body ground Ground Always Below 1 Ω
      E1 (B12-81) - Body ground W-B - Body ground Ground Always Below 1 Ω
      ME01 (B12-20) - 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 ECM connectors.
    4. Measure the voltage of the connectors.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      STA (A10-48) - E1 (B12-81) V - W-B Starter relay operation signal Cranking 10 to 14 V
      ACCR (A10-13) - E1 (B12-81) B - W-B ACC relay cut signal (output) Brake pedal depressed, shift lever P position, engine switch is pushed once → on (IG) 0.1 to 0.8 V*1 → Output voltage at terminal AM1 or AM2 is -2 V or more.
      TACH (A10-15) - E1 (B12-81) B - W-B Engine revolution signal (output) Idling Pulse generation (see  1waveform 1)
      STP (A10-36) - E1 (B12-81) W - W-B Stop light switch signal (input) Brake pedal depressed 7.5 to 14 V
      STP (A10-36) - E1 (B12-81) W - W-B Stop light switch signal (input) Brake pedal released Below 1.5 V
      STAR (B12-63) - E1 (B12-81) R - W-B Starter signal (Main) Brake pedal depressed, shift lever P or N position, engine switch on (ST) 10 to 14 V
      NSW (B12-62) - E1 (B12-81) L-B - W-B Park / neutral position switch Shift lever P or N position → except P or N position Below 1 V → Pulse generation
      STSW (A10-14) - E1 (B12-81) R - W-B Starter activation request signal Brake pedal depressed, engine switch held on (ST) Output voltage at terminal AM1 or AM2 is -2V or more.
      HINT:
      *1: Voltage is output only when the engine is cranking.

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

    5. Using an oscilloscope, check the signal waveform of the ECM.

      Waveform 1 (Reference): 

      WAVEFORM REFERENCE (WAVEFORM 1)

      Terminal No. TACH (A10-15) - E1 (B12-81)
      Tool Setting 5V/DIV., 10 ms./DIV.
      Vehicle Condition Engine idling

      HINT:

      As the vehicle speed increases, the wavelength shortens.

      Fig 7: Waveform Graph
      G04975563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK STEERING LOCK ECU 
    Fig 8: Identifying Steering Lock ECU Connector Terminals
    G05248813Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E78 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      B (E78-7) - Body ground B - Body ground +B power supply Always 10 to 14 V
      IG2 (E78-6) - Body ground B - Body ground Ignition power supply Engine switch on (IG) 10 to 14 V
      IG2 (E78-6) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      GND (E78-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      SGND (E78-2) - 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 E78 ECU connector.
    4. Measure the voltage of the connector.
      VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      SLP1 (E78-4) - GND (E78-1) GR - W-B Steering lock actuator position signal Steering is locked 10 to 14 V
      SLP1 (E78-4) - GND (E78-1) GR - W-B Steering lock actuator position signal Steering is released Below 1 V

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

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