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Terminals Of Ecu

  1. CHECK AIR CONDITIONING AMPLIFIER 
    Fig 1: Identifying ECU Terminals
    G05297716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    Check from the rear of the connector while it is connected to the A/C amplifier.

    ECU TERMINALS REFERENCE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    B (K52-1) - Body ground L - Body ground Power source (Back-up) Always 10 to 14 V
    HT2 (K52-2) - Body ground R - Body ground GLW RLY2 relay signal Engine running at 850 rpm or more, ambient temperature 3°C (37.4°F) or less, engine coolant temperature 75°C (167°F) or less, A/C switch setting MAX HOT, blower switch Lo 10 to 14 V
    SOL+ (K52-5) - Body ground R - Body ground A/C compressor operation signal A/C magnetic clutch to ON Pulse generation (see  awaveform 1)
    S5-1 (K52-7) - SG-1 (K52-19) P - B Power supply for room temperature sensor Engine switch: off Below 1.0 V
    Engine switch: on (IG) 5 V
    BLW (K52-11) - GND (K52-20) G - W-B Blower motor control signal Engine switch: on (IG)
    Blower switch: OFF → ON    		 Pulse generation (see  bwaveform 2)
    PRE (K52-13) - SG-2 (K52-38) W - V Pressure sensor signal Start engine, operate A/C system Refrigerant pressure: Abnormal pressure (more than 3,030 kPa (31.0 kgf/cm, 440 psi)) 4.7 V or higher
    PRE (K52-13) - SG-2 (K52-38) W - V Pressure sensor signal Start engine, operate A/C system Refrigerant pressure: Abnormal pressure (less than 180 kPa (1.9 kgf/cm, 27 psi)) Below 0.7 V
    PRE (K52-13) - SG-2 (K52-38) W - V Pressure sensor signal Start engine, operate A/C system Refrigerant pressure: Abnormal pressure (more than 3,030 kPa (31.0 kgf/cm, 440 psi) and more than 180 kPa (1.9 kgf/cm, 27 psi)) 0.7 to 4.7 V
    TSP (K52-14) - GND (K52-20) P - W-B Passenger side solar sensor signal Engine switch: on (IG)
    Solar sensor subject to electric light    		 0.8 to 4.3 V
    RH (K52-15) - SG-1 (K52-19) SB - B Humidity sensor signal Engine switch on (IG), vehicle interior temperature 25°C (77°F), vehicle interior humidity 40 to 60% 40%: 1.61 - 2.24 V
    60%: 2.26 - 2.66 V
    TR (K52-16) - SG-1 (K52-19) BR - B Room temperature sensor signal Engine switch on (IG), vehicle interior temperature 25°C (77°F) 1.8 - 2.2 V
    SG-1 (K52-19) - Body ground B - Body ground Ground for room temperature sensor (built-in humidity sensor) Always Below 1.0 Ω
    GND (K52-20) - Body ground W-B - Body ground Ground for main power supply Always Below 1.0 Ω
    IG+ (K52-21) - Body ground W - Body ground Power source (IG) Engine switch: off or on (ACC) Below 1.0 V
    Engine switch: on (IG) 10 to 14 V
    S5-2 (K52-26) - SG-2 (K52-38) Y - V Power supply for pressure sensor Engine switch: on (IG)
    A/C switch: OFF    		 Below 1.0 V
    Engine switch: on (IG)
    A/C switch: ON    		 5 V
    MPX+ (K52-30) SB Multiplex communication system Multiplex communication circuit -
    MPX- (K52-31) Y Multiplex communication system Multiplex communication circuit -
    DGS1 (K52-33) - SG-6 (K52-39) R - CR Exhaust gas sensor signal (NOx) After 30 seconds from engine switch on (IG) and sensor is exposed to exhaust gas 1.0 to 4.5 V
    DGS (K52-34) - SG-6 (K52-39) L - CR Exhaust gas sensor signal (HC, CO) After 30 seconds from engine switch on (IG) and sensor is exposed to exhaust gas 1.0 to 4.5 V
    TSD (K52-35) - GND (K52-20) LG - W-B Driver side solar sensor signal Engine switch: on (IG)
    Solar sensor subject to electric light    		 0.8 to 4.3 V
    SG-2 (K52-38) - Body ground V - Body ground Ground for pressure sensor Always Below 1.0 Ω
    SG-6 (K52-39) - Body ground CR - Body ground Ground for exhaust gas sensor Always Below 1.0 Ω
    HT1 (K51-13) - Body ground Y - Body ground GLW RLY1 relay signal Engine running at 850 rpm or more, ambient temperature 3°C (37.4°F) or less, engine coolant temperature 75°C (167°F) or less, A/C switch setting MAX HOT, blower switch Lo 10 to 14 V
    BUSG (z1-2) - Body ground - Ground for BUS IC Always Below 1.0 Ω
    BUS (z1-3) - BUSG (z1-2) - BUS IC control signal Engine switch: off → on (IG) Pulse generation
    BBUS (z1-4) - BUSG (z1-2) - Power supply for BUS IC Engine switch: off Below 1.0 V
    Engine switch: on (IG) 10 to 14 V
    SG-10 (z1-5) - BUSG (z1-2) - Ground for evaporator temperature sensor Always Below 1.0 Ω
    TE (z1-6) - SG-10 (z1-5) - Evaporator temperature sensor signal Engine switch on (IG), temperature near evaporator is 15°C (59°F) 1.4 - 1.8 V
    1. Waveform 1:
      WAVEFORM 1 REFERENCE

      Item Contents
      Symbols (Terminal No.) SOL+ (K52-5) - Body ground
      Tool Setting 5 V / DIV., 500 μs / DIV.
      Vehicle Condition A/C magnetic clutch to ON
      Fig 2: Waveform 1 Graph
      G04978885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Waveform 2:
      WAVEFORM 2 REFERENCE

      Item Contents
      Symbols (Terminal No.) BLW (K52-11) - GND (K52-20)
      Tool Setting 1 V/DIV., 500 μs / DIV.
      Vehicle Condition Engine switch: on (IG)
      Blower switch: OFF → ON

      HINT:

      When the blower level is increased, the duty ratio changes accordingly.

    Fig 3: Waveform 2 Graph
    G04978887Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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