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Terminals Of Ecu

  1. CHECK AIR CONDITIONING AMPLIFIER 
    Fig 1: Identifying Air Conditioning Amplifier Terminals
    G05401591Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    Check from the rear of the connector while it is connected to the air conditioning amplifier.

    VOLTAGE AND RESISTANCE SPECIFICATION

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    G7-1 (S5-3) - G7-12 (GND) Y - W-B Power supply for pressure sensor Ignition switch: ON 4.5 to 5.5 V
    G7-2 (TX+) - G7-12 (GND) V - W-B CAN communication line Ignition switch: ON Pulse generation (see  awaveform 1)
    G7-3 (TX-) - G7-12 (GND) W - W-B CAN communication line Ignition switch: ON Pulse generation (see  bwaveform 2)
    G7-4 (SG-2) - Body ground L - Body ground Ground for evaporator temperature sensor Always Below 1.0 Ω
    G7-5 (TAM) - G7-11 (SG-1) W-B Ambient temperature sensor signal Ignition switch: ON 1.35 to 1.75 V
    Ambient temperature: 25°C
    G7-6 (PRE) - G7-11 (SG-1) GR-B A/C pressure sensor signal Refrigerant pressure: normal 0.76 to 4.74 V
    G7-6 (PRE) - G7-11 (SG-1) GR-B A/C pressure sensor signal Refrigerant pressure: abnormal (less than 0.196 MPa [2.0 kgf/cm2 ] or more than 3.14 MPa [32 kgf/cm2 ]) Below 0.76 V or 4.74 V or more
    G7-7 (SOL+) - G7-12 (GND) LG - W-B A/C compressor operation signal Engine idling Pulse generation (see  cwaveform 3)
    Blower switch: 1
    A/C switch: ON
    G7-8 (IG+) - G7-12 (GND) Y - W-B Power source (IG) Ignition switch: ON 11 to 14 V
    G7-9 (SBLW) - G7-12 (GND) BR - W-B Blower motor ON signal Ignition switch: ON 11 to 14 V → 0 V
    Blower switch: 0 → 1
    G7-10 (TE) - G7-4 (SG-2) GR - L Evaporator temperature sensor signal Ignition switch: ON 1.0 to 1.3 V
    Temperature near evaporator: 15°C (59°F)
    G7-11 (SG-1) - Body ground B - Body ground Ground for ambient temperature sensor Always Below 1.0 Ω
    G7-12 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1.0 Ω
    G7-15 (A/C) - G7-12 (GND) LG - W-B A/C switch signal Ignition switch: ON Below 1 V → 11 to 14 V
    Defroster: OFF
    A/C switch: OFF → ON
    Defroster mode detection switch signal Ignition switch: ON Below 1 V → 11 to 14 V
    A/C switch: OFF
    Defroster: OFF → ON
    G7-16 (LED) - Body ground P - Body ground A/C switch indicator signal Engine idling 11 to 14 V → Below 4 V
    A/C switch: ON
    Blower switch: 0 → 1
    G8-9 (PTC1) - G7-12 (GND) V - W-B PTC heater relay operation signal Engine idling Below 1 V → 11 to 14 V
    No. 3 heater control knob: Max Hot
    Engine coolant temperature: Below 65°C (149°F)
    Ambient temperature: Below 10°C (50°F)
    Blower switch: 0 → 1
    Waiting time: 10 seconds
    G8-10 (PTC2) - G7-12 (GND) BR - W-B PTC heater relay operation signal Engine idling Below 1 V → 11 to 14 V
    No. 3 heater control knob: Max Hot
    Engine coolant temperature: Below 65°C (149°F)
    Ambient temperature: Below 10°C (50°F)
    Blower switch: 0 → 1
    Waiting time: 20 seconds
    G8-12 (PTC3) - G7-12 (GND) R - W-B PTC heater relay operation signal Engine idling Below 1 V → 11 to 14 V
    No. 3 heater control knob: Max Hot
    Engine coolant temperature: Below 65°C (149°F)
    Ambient temperature: Below 10°C (50°F)
    Blower switch: 0 → 1
    Waiting time: 30 seconds
    G8-14 (HEAT) - Body ground LG - Body ground MAX HOT switch detection signal Ignition switch: ON 11 to 14 V
    No. 3 heater control knob: Max Hot
    G8-23 (HLS) - Body ground LG - Body ground Headlight control signal Engine idling 11 to 14 V → Below 1 V
    Light control switch: OFF → HEAD
    G8-24 (ALT) - G7-12 (GND) P - W-B Generator (Alternator) operation signal Engine idling Pulse generation
    1. Waveform 1 (Reference): Using an oscilloscope

      CAN communication signal 

      WAVEFORM REFERENCE (WAVEFORM 1)

      Terminal Name Between G7-2 (TX+) - G7-12 (GND)
      Tester Range 1 V/DIV., 10 μsec./DIV.
      Condition Ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 2: Waveform Graph (Waveform 1)
      G05401592Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Waveform 2 (Reference): Using an oscilloscope

      CAN communication signal 

      WAVEFORM REFERENCE (WAVEFORM 2)

      Terminal Name Between G7-3 (TX-) - G7-12 (GND)
      Tester Range 1 V/DIV., 10 μsec./DIV.
      Condition Ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 3: Waveform Graph (Waveform 2)
      G05401593Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Waveform 3 (Reference): Using an oscilloscope

      Compressor and pulley operation signal 

      WAVEFORM REFERENCE (WAVEFORM 3)

      Terminal Name Between G7-7 (SOL+) - G7-12 (GND)
      Tester Range 5 V/DIV., 500 μsec./DIV.
      Condition Engine idling, Blower switch 1, A/C switch ON
      Fig 4: Waveform Graph (Waveform 3)
      G05401594Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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