AIR CONDITIONING SYSTEM(for Manual Air Conditioning System) TERMINALS OF ECU


  1. CHECK AIR CONDITIONING AMPLIFIER

    A005KCCE02

    Tech Tips

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

    Standard
    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    F41-24 (S5-3) - F41-23 (GND) Y - W-B Power supply for pressure sensor Ignition switch: ON 4.75 to 5.25 V
    F41-8 (TX+) - F41-23 (GND) V - W-B CAN communication line Ignition switch: ON

    Pulse generation

    (see waveform 1)
    F41-9 (TX-) - F41-23 (GND) W - W-B CAN communication line Ignition switch: ON

    Pulse generation

    (see waveform 2)
    F41-15 (SG-1) - Body ground B - Body ground Ground for evaporator temperature sensor Always Below 1 Ω
    F41-22 (TAM)*1 - F41-5 (SG-2) W - L A/C ambient temperature sensor signal Ignition switch ON at 25°C (77°F) 1.35 to 1.75 V
    F41-7 (PRE) - F41-23 (GND) GR - W-B A/C pressure sensor signal Refrigerant pressure: normal 0.74 to 4.62 V
    F41-7 (PRE) - F41-23 (GND) GR - W-B A/C pressure sensor signal

    Refrigerant pressure: abnormal

    (less than 0.176 MPaG [1.8 kgf/cm2] or more than 3.03 MPaG [31 kgf/cm2])

    		 Below 0.74 V or 4.62 V or more
    F41-11 (SOL+) - F41-23 (GND) P - W-B A/C compressor operation signal Engine idling

    Pulse generation

    (see waveform 3)
    Blower switch: 1
    A/C switch: ON
    F41-1 (IG+) - F41-23 (GND) V - W-B Power source (IG) Ignition switch: ON 11 to 14 V
    F41-17 (SBLW) - F41-23 (GND) GR - W-B Blower motor ON signal Ignition switch: ON 11 to 14 V → 0 V
    Blower switch: 0 → 1
    F41-4 (TE) - F41-15 (SG- 1) GR - B Evaporator temperature sensor signal Ignition switch: ON 1.0 to 1.3 V
    Temperature near evaporator: 15°C (59°F)
    F41-5 (SG-2) - Body ground L - Body ground Ground for ambient temperature sensor Always Below 1 Ω
    F41-23 (GND) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
    F41-2 (A/C) - F41-23 (GND) G - 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
    F41-16 (LED) - Body ground BE - Body ground A/C switch indicator signal Engine idling 11 to 14 V → Below 4 V
    A/C switch: ON
    Blower switch: 0 → 1
    F41-13 (PTC1)*2 - Body ground SB - Body ground PTC heater relay operation signal Engine idling 11 to 14 V → Below 4 V
    Set temperature: MAX HOT
    Engine coolant temperature: Below 75°C (167°F)
    Ambient temperature: Below 10°C (50°F)
    Blower switch: OFF → LO
    F41-19 (PTC2)*2 - Body ground P - Body ground PTC heater relay operation signal Engine idling 11 to 14 V → Below 4 V
    Set temperature: MAX HOT
    Engine coolant temperature: Below 70°C (158°F)
    Ambient temperature: Below 10°C (50°F)
    Blower switch: OFF → LO
    F41-20 (PTC3)*2 - Body ground V - Body ground PTC heater relay operation signal Engine idling 11 to 14 V → Below 4 V
    Set temperature: MAX HOT
    Engine coolant temperature: Below 65°C (149°F)
    Ambient temperature: Below 10°C (50°F)
    Blower switch: OFF → LO

    • *1: w/o Rear Fog Light

    • *2: w/ Quick Heater Assembly

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


    1. A005JWRE01
      *a 1 V/DIV.
      *b 10 μsec./DIV.

      Waveform 1 (Reference) : Using an oscilloscope

      CAN Communication Signal
      Terminal Name F41-8 (TX+) - F41-23 (GND)
      Tester Range 1 V / DIV., 10 μsec. / DIV.
      Condition Ignition switch ON

      Tech Tips

      The waveform varies depending on the CAN communication signal.

    2. A005LZ2E01
      *a 1 V/DIV.
      *b 10 μsec./DIV.

      Waveform 2 (Reference) : Using an oscilloscope

      CAN Communication Signal
      Terminal Name F41-9 (TX-) - F41-23 (GND)
      Tester Range 1 V / DIV., 10 μsec. / DIV.
      Condition Ignition switch ON

      Tech Tips

      The waveform varies depending on the CAN communication signal.

    3. A005J4AE01
      *a 5 V/DIV.
      *b 500 μsec./DIV.

      Waveform 3: Using an oscilloscope

      Compressor and Pulley Operation Signal
      Terminal Name F41-11 (SOL+) - F41-23 (GND)
      Tester Range 5 V / DIV., 500 μsec. / DIV.
      Condition Engine idling, Blower switch 1, A/C switch ON

  2. CHECK COMBINATION METER ASSEMBLY

    A005LLEE02
    Standard
    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    F1-39 (IG+) - Body ground P - Body ground Power source (IG) Ignition switch: ON 11 to 14 V
    F1-40 (B) - Body ground L - Body ground Power source (Back-up) Always 11 to 14 V
    F1-34 (TX1-) - F1-35 (TX1+)* B - W Ambient temperature sensor signal Ignition switch ON at 25°C (77°F) 1.35 to 1.75 V

    • *: w/ Rear Fog Light

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