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Terminals Of Ecu

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK AIR CONDITIONING AMPLIFIER 
    Fig 1: Identifying ECU And E36 Connector Terminals
    G05585271Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of the connectors.

      HINT:

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

      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      S5-3 (E36-7) - GND (E36-24) B - W-B Power supply for pressure sensor Ignition switch ON 4.5 to 5.5 V
      CANH (E36-8) - GND (E36-24) V - W-B Hi-level CAN bus line Ignition switch ON Pulse generation (see  bwaveform 1)
      CANL (E36-9) - GND (E36-24) W - W-B Lo-level CAN bus line Ignition switch ON Pulse generation (see  cwaveform 2)
      SG-3 (E36-23) - Body ground B - Body ground Ground for evaporator temperature sensor Always Below 1 Ω
      PRE (E36-12) - SG-2 (E36-10) L - G Air conditioning pressure sensor signal Refrigerant pressure: normal 0.76 to 4.74 V
      PRE (E36-12) - SG-2 (E36-10) L - G Air conditioning pressure sensor signal Refrigerant pressure: Abnormal (less than 0.196 MPa [2.0 kgf/cm2 , 28 psi] Below 0.76 V
      PRE (E36-12) - SG-2 (E36-10) L - G Air conditioning pressure sensor signal Refrigerant pressure: Abnormal (more than 3.14 MPa [32 kgf/cm2 , 455 psi]) 4.74 V or more
      SG-2 (E36-10) - Body ground G - Body ground Ground for pressure sensor Always Below 1 Ω
      SOL+ (E36-13) - GND (E36-24) GR - W-B A/C compressor operation signal Engine idling Pulse generation (see  dwaveform 3)
      Heater control (blower switch): 1
      A/C switch ON
      IG+ (E36-14) - GND(E36-24) Y - W-B Power source (IG) Ignition switch ON 10 to 14 V
      SBLW (E36-21) - GND (E36-24) GR - W-B Blower motor ON signal Ignition switch ON 10 to 14 V → Below 1 V
      Heater control (blower switch): 0 → 1
      TE (E36-22) - SG-3 (E36-23) W - B Evaporator temperature sensor signal Ignition switch ON 1 to 1.3 V
      Temperature near evaporator: 15°C (59°F)
      GND (E36-24) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      A/C (E36-27) - GND (E36-24) P - W-B A/C switch signal Ignition switch ON Below 1 V → 10 to 14 V
      A/C switch OFF → ON
      LED (E36-28) - Body ground GR - Body ground A/C switch indicator signal Engine idling 10 to 14 V → Below 4 V
      A/C switch ON
      Heater control (blower switch): 0 → 1
      LOCK (E36-3)* - SG-2 (E36-10) W - G Compressor lock sensor signal Ignition switch ON A/C switch ON Magnetic clutch ON Pulse generation (see  ewaveform 4)
      MGC (E36-15)* - GND (E36-24) V - W-B Magnetic clutch relay signal Ignition switch ON Magnetic clutch OFF 10 to 14 V
      MGC (E36-15)* - GND (E36-24) V - W-B Magnetic clutch relay signal Ignition switch ON Magnetic clutch ON Below 1 V
      HINT:
      *:for 2GR-FE
    2. Using an oscilloscope, check waveform 1.

      CAN communication signal 

      CAN COMMUNICATION SIGNAL REFERENCE

      Item Content
      Symbols (Terminal No.) CANH (E36-8) - GND (E36-24)
      Tool Setting 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)
      G04950353Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using an oscilloscope, check waveform 2.

      CAN communication signal 

      CAN COMMUNICATION SIGNAL REFERENCE

      Item Content
      Symbols (Terminal No.) CANL (E36-9) - GND (E36-24)
      Tool Setting 1 V/DIV, 10 μmsec./DIV.
      Condition Ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 3: Waveform Graph (Waveform 2)
      G04950354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Using an oscilloscope, check waveform 3.

      A/C Compressor* operation signal 

      A/C COMPRESSOR OPERATION SIGNAL REFERENCE

      Item Content
      Symbols (Terminal No.) SOL+ (E36-13) - GND (E36-24)
      Tool Setting 5 V/DIV, 500 μsec./DIV.
      Condition Engine idling, Blower switch LO, A/C switch ON

      HINT:

      *: Compressor and pulley for 2AZ-FE, compressor and magnetic clutch for 2GR-FE

      Fig 4: Waveform Graph (Waveform 3)
      G04950351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Using an oscilloscope, check waveform 4.

      Compressor lock sensor signal* 

      COMPRESSOR LOCK SENSOR SIGNAL REFERENCE

      Item Content
      Symbols (Terminal No.) LOCK (E36-3)* - SG-2 (E36-10)
      Tool Setting 500 mV/DIV, 20 msec./DIV.
      Condition Ignition switch ON, A/C switch ON, Magnetic clutch ON
      HINT:
      *: for 2GR-FE
      Fig 5: Waveform Graph (Waveform 4)
      G05585195Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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