LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 225 (Air Conditioning) >> AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) >> Terminals Of Ecu

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
    G05585190Courtesy 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
      B (E37-21) - GND (E37-14) R - W-B Power source (Back-up) Always 10 to 14 V
      SOL+ (E37-2) - GND (E37-14) GR - W-B A/C compressor operation signal Engine idling Pulse generation (see  bwaveform 1)
      Blower switch LO
      A/C switch ON
      BLW (E37-23) - GND (E37-14) R - W-B Blower motor control signal Ignition switch ON Pulse generation (see  cwaveform 2)
      Blower switch LO
      PRE (E37-9) - SG-2 (E37-13) L - G Air conditioning pressure sensor signal Refrigerant pressure: Normal 0.76 to 4.74 V
      PRE (E37-9) - SG-2 (E37-13) 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 (E37-9) - SG-2 (E37-13) L - G Air conditioning pressure sensor signal Refrigerant pressure: Abnormal (more than 3.14 MPa [32 kgf/cm2 , 455 psi]) 4.74 V or higher
      TSD (E37-33) - S5-4 (E37-31) L - LG Driver side solar sensor signal Ignition switch ON 0.8 to 4.3 V
      Solar sensor subject to electric light
      TSP (E37-32) - S5-4 (E37-31) P - LG Passenger side solar sensor signal Ignition switch ON 0.8 to 4.3 V
      Solar sensor subject to electric light
      TR (E37-29) - SG-1 (E37-34) GR - V Room temperature sensor signal Ignition switch ON 1.8 to 2.2 V
      Vehicle interior temperature: 25°C (77°F)
      SG-1 (E37-34) - Body ground V - Body ground Ground for room temperature sensor Always Below 1 Ω
      GND (E37-14) - Body ground W-B - Body ground Ground for main power supply Always Below 1 Ω
      IG+ (E37-1) - GND (E37-14) Y - W-B Power source (IG) Ignition switch ON 10 to 14 V
      S5-3 (E37-10) - GND (E37-14) B - W-B Power supply for pressure sensor Ignition switch ON 4.5 to 5.5 V
      CANH (E37-11) - GND (E37-14) V - W-B Hi-level CAN bus line Ignition switch ON Pulse generation (see  dwaveform 3)
      CANL(E37-12) - GND (E37-14) W - W-B Lo-level CAN bus line Ignition switch ON Pulse generation (see  ewaveform 4)
      SG-2 (E37-13) - Body ground G - Body ground Ground for pressure sensor Always Below 1 Ω
      RDFG (E37-38) - GND (E37-14) B - W-B Rear defogger switch signal Ignition switch ON Rear defogger switch OFF 10 to 14 V
      RDFG (E37-38) - GND (E37-14) B - W-B Rear defogger switch signal Ignition switch ON Rear defogger switch ON Below 1 V
      LIN1 (E37-37) - GND (E37-14) B - W-B LIN communication signal Ignition switch ON Pulse generation
      BUB G (c1-2) - Body ground - Ground for BUS IC Always Below 1 Ω
      BUS (c1-3) - BUBG (d-2) - BUS IC control signal Ignition switch ON Pulse generation
      BBUS (d-4) - BUBG (c1-2) - Power supply for BUS IC Ignition switch ON 11 to 13 V
      SGA (d-5) - Body ground - Ground for evaporator temperature sensor Always Below 1 Ω
      TEA (d-6) - SGA (c1-5) - Evaporator temperature sensor signal Ignition switch ON 1.4 to 1.8 V
      Evaporator temperature: 15°C (59°F)
      LOCK (E37-8)* - SG-2 (E37-13) W - G Compressor lock sensor signal Ignition switch ON AUTO switch ON A/C switch ON Magnetic clutch ON Pulse generation (see  fwaveform 5)
      MGC (E37-20)* - GND (E37-14) V - W-B Magnetic clutch relay signal Ignition switch ON Magnetic clutch OFF 10 to 14 V
      MGC (E37-20)* - GND (E37-14) V - W-B Magnetic clutch relay signal Ignition switch ON Magnetic clutch ON Below 1.5 V
      HINT:
      *: for 2GR-FE
    2. Using an oscilloscope, check waveform 1.

      A/C Compressor* operation signal 

      A/C COMPRESSOR OPERATION SIGNAL REFERENCE

      Item Content
      Symbols (Terminal No.) SOL+ (E37-2) - GND (E37-14)
      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 2: Waveform Graph (Waveform 1)
      G04950351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using an oscilloscope, check waveform 2.

      Blower motor control signal 

      BLOWER MOTOR CONTROL SIGNAL REFERENCE

      Item Content
      Symbols (Terminal No.) BLW (E37-23) - GND (E37-14)
      Tool Setting 1 V/DIV., 500 μsec./DIV.
      Condition Ignition switch ON, Blower switch LO

      HINT:

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

      Fig 3: Waveform Graph (Waveform 2)
      G04950352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Using an oscilloscope, check waveform 3.

      CAN communication signal 

      CAN COMMUNICATION SIGNAL REFERENCE

      Item Content
      Symbols (Terminal No.) CANH (E37-11) - GND (E37-14)
      Tool Setting 1 V/DIV, 10 μsec/DIV.
      Condition Ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 4: Waveform Graph (Waveform 3)
      G04950353Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Using an oscilloscope, check waveform 4.

      CAN communication signal 

      CAN COMMUNICATION SIGNAL REFERENCE

      Item Content
      Symbols (Terminal No.) CANL (E37-12) - GND (E37-14)
      Tool Setting 1 V/DIV., 10 μsec/DIV.
      Condition Ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 5: Waveform Graph (Waveform 4)
      G04950354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 5.

      Compressor lock sensor signal* 

      COMPRESSOR LOCK SENSOR SIGNAL REFERENCE

      Item Content
      Symbols (Terminal No.) LOCK (E37-8)* - SG-2 (E37-13)
      Tool Setting 500 mV/DIV., 20 msec./DIV.
      Condition Ignition switch ON, AUTO switch ON, A/C switch ON, Magnetic clutch ON
      HINT:
      *: for 2GR-FE
      Fig 6: Waveform Graph (Waveform 5)
      G05585195Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK AIR CONDITIONING CONTROL 
    Fig 7: Identifying E23 Connector Terminals
    G05585196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance of the connectors.
      TERMINAL DESCRIPTION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      IG+ (E23-2) - GND (E23-7) L - W-B Power source (IG) Ignition switch ON 10 to 14 V
      GND (E23-7) - Body ground W-B - Body ground Ground for air conditioning control assembly Always Below 1 Ω
      LIN1 (E23-11) - GND (E23-7) B - W-B LIN communication signal Ignition switch ON Pulse generation
      +B (E23-1) - GND (E23-7) R - W-B Power source (Back-up) Always 10 to 14 V
      ACC (E23-8) - GND (E23-7) GR - W-B ACC power supply Always Below 1 Ω
scientia non olet · About LEMON Manuals