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Terminals Of Ecu

  1. A/C AMPLIFIER 
    Fig 1: Identifying Connector Terminals Of ECU
    G05251038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

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

    A/C AMPLIFIER CHART

    Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
    E1-1 (IG+) - E1-14 (GND) V-W - B Power source (IG) Engine switch on (IG) 10 to 14 V
    E1-1 (IG+) - E1-14 (GND) V-W - B Power source (IG) Engine switch off Below 1 V
    E1-2 (SOL+) - E1-14 (GND) W-W - B A/C compressor operation signal Engine is running
    A/C switch: ON
    Blower switch: LO    		 Pulse generation (See  a waveform 1)
    E1-5 (TAM) - E1-14 (GND) G-W - B A/C ambient temperature sensor signal Engine switch on (IG) at 25°C (77°F) 1.35 to 1.75 V
    E1-5 (TAM) - E1-14 (GND) G-W - B A/C ambient temperature sensor signal Engine switch on (IG) at 40°C (104°F) 0.9 to 1.2 V
    E1-6 (DGS) - E1-14 (GND) LG - W - B 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
    E1-7 (DGS1) - E1-14 (GND) P-W - B 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
    E1-8 (LOCK) - E1-14 (GND) G-W - B A/C compressor lock sensor signal Engine is running
    Blower switch: LO
    A/C switch: ON    		 Pulse generation (See  b waveform 2)
    E1-9 (PRE) - E1-13 (SG-2) R-L A/C pressure sensor signal Start engine, Operate A/C system, Refrigerant pressure: Abnormal pressure (more than 3,140 kPa (32.0 kgf/cm2 , 455 psi)) 4.74 V or higher
    E1-9 (PRE) - E1-13 (SG-2) R - L A/C pressure sensor signal Start engine, Operate A/C system, Refrigerant pressure: Abnormal pressure (less than 196 kPa (2.0 kgf/cm2 , 28 psi)) Below 0.76 V
    E1-9 (PRE) - E1-13 (SG-2) R - L A/C pressure sensor signal Start engine, Operate A/C system, Refrigerant pressure: Abnormal pressure (more than 3,140 kPa (32.0 kgf/cm2 ,455 psi) or less than 196 kPa (2.0 kgf/cm2 , 28 psi)) 0.76 to 4.74 V
    E1-10 (S5-3) - E1-13 (SG-2) G - L Power supply for A/C pressure sensor Engine switch on (IG) 4.5 to 5.5 V
    E1-11 (CANH) - E1-12 (CANL) GR - BR CAN communication system CAN communication circuit Pulse generation
    E1-13 (SG-2) - Body ground L - Body ground Ground for A/C pressure sensor, A/C ambient temperature sensor, A/C lock sensor Always Below 1 V
    E1-14 (GND) - Body ground W - B - Body ground Ground for main power supply Always Below 1 V
    E1-20 (MGC) - E1-14 (GND) B-W - B A/C compressor magnetic clutch operation signal Engine switch on (IG)
    Blower switch: LO
    A/C switch: OFF    		 10 to 14 V
    E1-20 (MGC) - E1-14 (GND) B-W - B A/C compressor magnetic clutch operation signal Engine switch on (IG)
    Blower switch: LO
    A/C switch: ON    		 Below 1 V
    E1-21 (B) - E1-14 (GND) GR - W - B Power source (Back-up) Always 10 to 14 V
    E1-23 (BLW) - E1-14 (GND) R-W - B Blower motor speed control signal Engine switch on (IG) Blower switch: ON Pulse generation (See  c waveform 3)
    E1-29 (TR) - E1-34 (SG-1) BR - LG A/C room temperature sensor signal Engine switch on (IG) Cabin temperature at 25°C (77°F) 1.8 to 2.2 V
    E1-29 (TR) - E1-34 (SG-1) BR - LG A/C room temperature sensor signal Engine switch on (IG) Cabin temperature at 40°C (104°F) 1.2 to 1.6 V
    E1-32 (TSP) - E1-14 (GND) Y-W - B A/C solar sensor signal (for Front passenger side) Engine switch on (IG) Solar sensor is subjected to electric light. 0.8 to 4.3 V
    E1-32 (TSP) - E1-14 (GND) Y-W - B A/C solar sensor signal (for Front passenger side) Engine switch on (IG) Solar sensor is covered with a cloth. Below 0.8 V
    E1-33 (TSD) - E1-14 (GND) O-W - B A/C solar sensor signal (for Driver side) Engine switch on (IG) Solar sensor is subjected to electric light. 0.8 to 4.3 V
    E1-33 (TSD) - E1-14 (GND) O-W - B A/C solar sensor signal (for Driver side) Engine switch on (IG) Solar sensor is covered with a cloth. Below 0.8 V
    E1-34 (SG-1) - Body ground LG - Body ground Ground for A/C room temperature sensor Always Below 1 V
    E1-37 (UN1) - E1-14 (GND) GR - W - B LIN communication signal Engine switch on (IG) Pulse generation
    E1-38 (RDFG) - E1-14 (GND) G-W - B DEF relay signal Engine switch on (IG) REAR DEF switch: ON Below 1 V
    E1-38 (RDFG) - E1-14 (GND) G-W - B DEF relay signal Engine switch on (IG) REAR DEF switch: OFF 10 to 14 V
    Y1-2 (BUS G) - Body ground - Ground for BUS IC Always Below 1 V
    Y1-3 (BUS) - Y1-2 (BUSG) - BUS IC control signal Engine switch off → on (IG) Pulse generation
    Y1-4 (BBUS) - Y1-2 (BUSG) - Power supply for BUS IC Engine switch off Below 1 V
    Y1-4 (BBUS) - Y1-2 (BUSG) - Power supply for BUS IC Engine switch on (IG) 10 to 14 V
    Y1-5 (SG-3) - Body ground - Ground for evaporator temperature sensor Always Below 1 V
    Y1-6 (TEA) - Y1-5 (SG-3) - A/C evaporator temperature sensor signal Engine switch on (IG) Evaporator temperature at 0°C (32°F) 1.7 to 2.1 V
    Y1-6 (TEA) - Y1-5 (SG-3) - A/C evaporator temperature sensor signal Engine switch on (IG) Evaporator temperature at 15°C (59°F) 0.7 to 1.3 V
    1. Waveform 1:
      WAVEFORM 1 REFERENCE CHART

      Item Contents
      Terminal No. (Symbols) E1-2 (SOL+) - E1-14 (GND)
      Tool Setting 5 V/DIV., 500 μs./DIV.
      Vehicle Condition Engine is running A/C switch: ON
      Fig 2: Identifying Waveform 1
      G04978885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Waveform 2:
      WAVEFORM 2 REFERENCE CHART

      Item Contents
      Terminal No. (Symbols) E1-8 (LOCK) - E1-14 (GND)
      Tool Setting 200mV/DIV., 10ms./DIV.
      Vehicle Condition Engine is running
      Blower switch: LO
      A/C switch: ON
      Fig 3: Identifying Waveform 2
      G04978886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Waveform 3:
      WAVEFORM 3 REFERENCE CHART

      Item Contents
      Terminal No. (Symbols) E1-23 (BLW) - E1-14 (GND)
      Tool Setting 1 V/DIV., 500 μ./DIV.
      Vehicle Condition Engine switch on (IG)
      Blower switch: ON
      Fig 4: Identifying Waveform 3
      G04978887Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. A/C CONTROL ASSEMBLY 
    Fig 5: Identifying A/C Control Assembly
    G05251042Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

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

    A/C CONTROL ASSEMBLY CHART

    Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
    E3-1 (+B) - E3-18 (GND) GR - W - B Power source (Back-up) Always 10 to 14 V
    E3-2 (IG+) - E3-18 (GND) V-W - B Power source (IG) Engine switch off Below 1 V
    E3-2 (IG+) - E3-18 (GND) V-W - B Power source (IG) Engine switch on (IG) 10 to 14 V
    E3-10 (ACC) - E3-18 (GND) L-W - B Power source (ACC) Engine switch off Below 1 V
    E3-10 (ACC) - E3-18 (GND) L-W - B Power source (ACC) Engine switch on (ACC) 10 to 14 V
    E3-15 (TX+) - E3-18 (GND) GR - W - B LIN communication circuit Engine switch on (IG) Pulse generation
    E3-18 (GND) - Body ground W - B - Body ground Ground for A/C control assembly Always Below 1 V
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