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Terminals Of Ecu

  1. CHECK POWER SOURCE CONTROL ECU 
    Fig 1: Identifying Power Source Control ECU Terminals
    G04028152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K73 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      POWER SOURCE CONTROL ECU TERMINAL VOLAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      AM1 (K73-33) - Body ground O - Body ground +B power supply Always 10 to 14 V
      AM2 (K73-12) - Body ground BR - Body ground +B power supply Always 10 to 14 V
      SSW1 (K73-14) - Body ground P - Body ground Engine switch signal Engine switch pushed Below 1 Ω
      SSW1 (K73-14) - Body ground P - Body ground Engine switch signal Engine switch not pushed 10 kΩ or higher
      SSW2 (K73-37) - Body ground B - Body ground Engine switch signal Engine switch pushed Below 1 Ω
      SSW2 (K73-37) - Body ground B - Body ground Engine switch signal Engine switch not pushed 10 kΩ or higher
      GND2 (K73-6) - Body ground W-B - Body ground Ground Always Below 1 Ω
      LIN1 (K73-30) - Body ground W - Body ground LIN line Always 10 kΩ or higher

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

    3. Reconnect the K73 ECU connector.
    4. Measure the voltage of the connector.
      POWER SOURCE CONTROL ECU TERMINAL VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      ACCD (K73-11) - GND2 (K73-6) G - W-B ACC signal Engine switch on (ACC) 10 to 14 V
      ACCD (K73-11) - GND2 (K73-6) G - W-B ACC signal Engine switch off Below 1 V
      IG1D (K73-34) - GND2 (K73-6) SB - W-B IG1 signal Engine switch on (IG) 10 to 14 V
      IG1D (K73-34) - GND2 (K73-6) SB - W-B IG1 signal Engine switch on (ACC) Below 1 V
      IG2D (K73-35) - GND2 (K73-6) Y - W-B IG2 signal Engine switch on (IG) 10 to 14 V
      IG2D (K73-35) - GND2 (K73-6) Y - W-B IG2 signal Engine switch on (ACC) Below 1 V
      STP (K73-1) - GND2 (K73-6) V - W-B Stop light signal Brake pedal depressed 10 to 14 V
      STP (K73-1) - GND2 (K73-6) V - W-B Stop light signal Brake pedal released Below 1 V
      SLR+ (K73-32) - GND2 (K73-6) LG - W-B Steering lock motor signal Steering lock motor operating Below 1 V
      SLR+ (K73-32) - GND2 (K73-6) LG - W-B Steering lock motor signal Steering lock motor does not operate 10 to 14 V
      SLP (K73-26) - GND2 (K73-6) V - W-B Steering lock actuator position signal Steering lock is locked 10 to 14 V
      SLP (K73-26) - GND2 (K73-6) V - W-B Steering lock actuator position signal Steering lock is released Below 1 V
      SPD (K73-19) - GND2 (K73-6) L - W-B Vehicle speed signal Engine switch on (IG), rotate rear wheel slowly Pulse generation (see )
      TACH (K73-2) - GND2 (K73-6) W - W-B Tachometer signal Engine running Pulse generation (see )
      P (K73-5) - GND2 (K73-6) LG - W-B Shift lock signal Shift lever P position 10 to 14 V
      P (K73-5) - GND2 (K73-6) LG - W-B Shift lock signal Shift lever not P position Below 1 V
      CTSW (K73-31) - GND2 (K73-6) R - W-B Starter assist signal Brake pedal depressed, shift lever P position, engine switch is pushed once Below 1 V*1
      STSW (K73-39) - GND2 (K73-6) V - W-B Starter activation request signal Brake pedal depressed, shift lever P position, engine switch is pushed once 10 to 14 V*2
      STR1 (K73-17) - GND2 (K73-6) SB - W-B Park/neutral position switch Shift lever P or N position Below 1 V
      STR2 (K73-15) - GND2 (K73-6) L - W-B Starter signal Brake pedal depressed, shift lever P position, engine switch is pushed once 10 to 14 V*2
      INDS (K73-4) - GND2 (K73-6) SB - W-B Vehicle condition signal Brake pedal depressed, shift lever P position, engine switch on (ACC, IG) 10 to 14 V
      INDW (K73-13) - GND2 (K73-6) R - W-B Warning signal Brake pedal released, shift lever P position, engine switch on (ACC, IG) 10 to 14 V
      SWIL (K73-36) - GND2 (K73-6) GR - W-B Illumination signal Light control switch TAIL or HEAD 10 to 14 V

      HINT:

      *1: Voltage is output only when the engine is cranking.

      *2: Voltage is output for 0.3 seconds after the engine start.

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

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

      Waveform 1 (Reference): 

      POWER SOURCE CONTROL ECU TERMINAL RESISTANCE SPECIFICATION

      Terminal No. K73-19 - Body ground
      Tool Setting 5 V / DIV., 10 msec. / DIV.
      Vehicle Condition Driving at approx. 20 km / h (12 mph)

      HINT:

      As vehicle speed increases, the wavelength shortens.

      Fig 2: Signal Waveform Graph
      G04028153Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform 2 (Reference): 

      WAVEFORM TERMINAL REFERENCE

      Terminal No. K73-2 - Body ground
      Tool Setting 5 V/DIV., 10 msec./DIV.
      Vehicle Condition Engine idling

      HINT:

      As the vehicle speed increases, the wavelength shortens.

  2. CHECK CERTIFICATION ECU 
    Fig 3: Signal Waveform Graph
    G04028154Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Identifying Certification ECU Connector Terminals
    G04028155Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the U28 and U33 ECU connectors.
    2. Measure the voltage and resistance of the wire harness side connector.
      ECU TERMINAL VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B1 (U28-1) - Body ground R - Body ground +B power supply Always 10 to 14 V
      IG (U28-18) - Body ground B - Body ground Ignition power supply Engine switch on (IG) 10 to 14 V
      IG (U28-18) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      LIN (U28-10) - Body ground LG - Body ground LIN line Always 10 kΩ or higher
      E (U28-17) - 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. CHECK ECM 
    Fig 5: Identifying A6, E6, E7 And E8 ECM Connectors
    G04028156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A6, E6, E7 and E8 ECM connectors.
    2. Measure the voltage and resistance of the wire harness side connectors.
      ECM TERMINAL VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (A6-6) - Body ground B-R - Body ground Power source of ECM Engine switch on (IG) 10 to 14 V
      +B1 (A6-5) - Body ground B-R - Body ground Power source of ECM Engine switch on (IG) 10 to 14 V
      IGSW (A6-17) - Body ground B-W - Body ground Ignition switch signal Engine switch on (IG) 10 to 14 V
      E01 (E6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E02 (E6-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E03 (E8-6) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E1 (E7-7) - Body ground BR - Body ground Ground Always Below 1 Ω
      EC (A6-2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      ME01 (E8-4) - 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 A6, E6, E7 and E8 ECM connectors.
    4. Measure the voltage of the connectors.
      ECM TERMINAL VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      STA (A6-12) - E1 (E7-7) R - BR Starter relay operation signal Cranking 10 to 14 V
      ACCR (A6-11) - E1 (E7-7) W-L - BR ACC relay cut signal (output) Engine switch on (IG) 10 to 14 V
      TACH (A7-16) - E1 (E7-7) W-L - BR Engine revolution signal (output) Idling Pulse generation (see WAVEFORM TERMINAL REFERENCE  )
      STP (A7-4) - E1 (E7-7) R-B - BR Stop light switch signal (input) Brake pedal depressed 7.5 to 14 V
      STP (A7-4) - E1 (E7-7) R-B - BR Stop light switch signal (input) Brake pedal released Below 1.5 V
      STAR (E7-4) - E1 (E7-7) L-Y - BR PNP switch signal (input) Engine switch on (IG), shift position P or N 10 to 14 V

      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 TERMINAL REFERENCE

      Terminal No. A7-16 - Body ground
      Tool Setting 5 V/DIV., 10 msec./DIV.
      Vehicle Condition Engine idling

      HINT:

      As the vehicle speed increases, the wavelength shortens.

      Fig 6: Signal Waveform Graph
      G04028157Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK STEERING LOCK ECU 
    Fig 7: Identifying Steering Lock ECU Connector Terminals
    G04028158Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K28 ECU connector.
    2. Measure the voltage and resistance of the wire harness side connector.
      STEERING LOCK ECU TERMINAL VOLTAGE AND RESISTANCE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      B (K28-7) - Body ground L - Body ground +B power supply Always Always
      IG2 (K28-6) - Body ground B - Body ground Ignition power supply Engine switch on (IG) Always
      IG2 (K28-6) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      GND (K28-1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      SGND (K28-2) - 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 K28 ECU connector.
    4. Measure the voltage of the connector.
      STEERING LOCK ECU TERMINAL VOLTAGE SPECIFICATION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      SLP1 (K28-4) - GND (K28-1) V - W-B Steering lock actuator position signal Steering lock is locked 10 to 14 V
      SLP1 (K28-4) - GND (K28-1) V - W-B Steering lock actuator position signal Steering lock is released Below 1 V

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

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