LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2008 >> Land Cruiser >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating/Air Conditioning >> Air Conditioning System >> Terminals Of Ecu

Terminals Of Ecu

  1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    Fig 1: Identifying E36, E35 And Z34 Air Conditioning Amplifier Connectors Terminals
    G05635334Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E36, E35 and z34 air conditioning amplifier connectors.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E36-6 (+B1) - E36-1 (GND) R - W-B Battery power source Always 11 to 14 V
      E36-7 (+B2) - E36-1 (GND) R - W-B Battery power source Always 11 to 14 V
      Z34-3 (B BUS) - Z34-1 (BUS G) - Power supply for BUS IC (front) Always 11 to 14 V
      z34-10 (BBUS) - z34-8 (BUS G) - Power supply for BUS IC (front) Always 11 to 14 V
      E36-5 (IG+) - E36-1 (GND) G - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      E36-14 (RBBU) - E36-12 (RBUG) L - BR Power supply for BUS IC (rear) Always 11 to 14 V
      E35-25 (TR3) - Body ground V - Body ground Ground Engine switch on (IG) Driver side duct sensor temperature: 25°C (77°F) 5000+/-150Ω
      E35-26 (TR4) - Body ground W - Body ground Ground Engine switch on (IG) Passenger side duct sensor temperature: 25°C (77°F) 5000+/-150Ω
      E35-16 (SG-2) - Body ground G - Body ground Ground for pressure sensor Always Below 1 Ω
      E35-29 (SG-5) - Body ground G - Body ground Ground for compressor signal Always Below 1 Ω
      E36-2 (E1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E36-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E35-6 (E2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E35-32 (SG-1) - Body ground B - Body ground Ground for room temperature sensor (front) Always Below 1 Ω
      Z34-6 (SGA) - Body ground - Ground for evaporator temperature sensor Always Below 1 Ω
      Z34-1 (BUS G) - Body ground - Ground for BUS IC (front) Always Below 1 Ω
      234-8 (BUS G) - Body ground - Ground for BUS IC (front) Always Below 1 Ω
      E35-34 (SGND) - Body ground BR - Body ground Ground for duct sensor (driver side) Always Below 1 Ω
      E35-12 (SG-9) - Body ground L - Body ground Ground for duct sensor (passenger side) Always Below 1 Ω
      E35-2 (SG-6) - Body ground G - Body ground Ground for room temperature sensor signal (rear LH and rear RH) Always Below 1 Ω
      E36-12 (RBUG) - Body ground BR - Body ground Ground for BUS IC (rear) Always Below 1 Ω
      E35-1 (SG) - Body ground P - Body ground Ground for evaporator temperature sensor signal (rear) Always Below 1 Ω

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

    3. Reconnect the E36, E35 and z34 air conditioning amplifier connectors.
    4. Measure the voltage according to the value (s) in the table below.
      TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E36-25 (CFN+) - Body ground R - Body ground Condenser FAN operation signal Engine switch on (IG) 11 to 14 V
      E36-33 (COOL) - Body ground W - Body ground Cool box operation signal Engine switch on (IG)
      Cool box switch: ON      		 Below 1 V
      Engine switch on (IG)
      Cool box switch: OFF      		 11 to 14 V
      E36-28 (AC1) - Body ground L - Body ground Compressor operation signal Engine switch on (IG)
      A/C switch: OFF      		 11 to 14 V
      Engine switch on (IG)
      A/C switch: ON      		 Below 1 V
      E36-22 (ACT) - Body ground G - Body ground Compressor operation signal Engine switch on (IG)
      A/C switch: OFF      		 Below 1 V
      Engine switch on (IG)
      A/C switch: ON      		 11 to 14 V
      E35-28 (LOCK) - E35-29 (SG-5) L-G Air compressor lock sensor signal Engine idling A/C switch: ON Blower switch LO Pulse generation (see  e waveform 1)
      E35-13 (TAM) - E35-16 (SG-2) V-G Ambient temperature sensor signal Engine switch on (IG) Ambient temperature: 25°C (77°F) 1.4 to 1.6V
      Engine switch on (IG) Ambient temperature: 50°C (122°F) 0.7 to 0.9 V
      E35-27 (S5-1) - E35-16 (SG-2) LG - G Power supply for pressure sensor Engine switch on (IG) 4.5 to 5.5 V
      E35-20 (PRE) - E35-16 (SG-2) R - G Air conditioning pressure sensor signal Refrigerant pressure: Normal 1.0 to 4.8 V
      Refrigerant pressure: Abnormal (less than 0.1762 MPa [1.8 kgf/cm2 , 25 psi]) Below 1 V
      Refrigerant pressure: Abnormal (more than 3.0732 MPa [31.4 kgf/cm2 , 445 psi]) 4.8 V or higher
      E36-18 (MGC) - E36-1 (GND) R - W-B A/C compressor magnetic clutch operation signal Engine idling Blower switch LO A/C switch: ON Below 1 V
      E36-3 (BLW) - E36-1 (GND) R - W-B Blower motor control signal Engine switch on (IG) Blower switch LO Pulse generation (see  f waveform 2)
      E35-9 (TR) - E35-32 (SG-D W - B Room temperature sensor signal (front) Engine switch on (IG) Front side interior temperature: 25°C (77°F) 1.9 to 2.1 V
      Room temperature sensor signal (front) Engine switch on (IG) Front side interior temperature: 50°C (122°F) 1.0 to 2.0 V
      E35-7 (TSD) - Body ground LG - Body ground Driver side solar sensor signal Engine switch on (IG) Solar sensor subjected to electric light 0.8 to 4.3 V
      E35-8 (TSP) - Body ground GR - Body ground Passenger side solar sensor signal Engine switch on (IG) Solar sensor subjected to electric light 0.8 to 4.3 V
      Z34-7 (TEA) - Z34-6 (SGA) - Evaporator temperature sensor signal Engine switch on (IG) Evaporator temperature: 15°C (59°F) 1.0 to 1.2V
      z34-2 (BUS) - z34-1 (BUS G) - BUS IC control signal (front) Engine switch on (IG) Pulse generation
      z34-9 (BUS) - z34-8 (BUS G) - BUS IC control signal (front) Engine switch on (IG) Pulse generation
      E35-18 (TR) - E35-2 (SG-6) R-G Room temperature sensor signal (rear LH) Engine switch on (IG) Vehicle interior temperature: 25°C (77°F) 1.9 to 2.1V
      Engine switch on (IG) Vehicle interior temperature: 50°C (122°F) 1.0 to 1.2 V
      E35-19 (TR7) - E35-2 (SG-6) R-G Room temperature sensor signal (rear RH) Engine switch on (IG) Vehicle interior temperature: 25°C (77°F) 1.9 to 2.1 V
      Engine switch on (IG) Vehicle interior temperature: 50°C (122°F) 1.0 to 1.2 V
      E36-13 (RBUS) - E36-12 (RBUG) R - BR BUS IC control signal (rear) Engine switch on (IG) Pulse generation
      E35-17 (TEC) - E35-1 (SG) W - P Evaporator temperature sensor signal (rear) Engine switch on (IG) Evaporator temperature: 15°C (59°F) 1.4 to 1.8 V
      E36-31 (ALT) - Body ground R - Body ground Generator signal Engine idling Pulse generation
      E36-20 (LIN1) - E36-1 (GND) Y - W-B LIN communication signal (front A/C switch) Engine switch on (IG) Pulse generation
      E36-21 (RLIN) - E36-1 (GND) L - W-B LIN communication signal (rear A/C switch) Engine switch on (IG) Pulse generation
      E36-27 (PTC1) - Body ground R - Body ground PTC1 heater relay operation signal Engine idling Set temperature: Hi Engine coolant temperature: Below 65°C (149°F)
      Ambient temperature: Below 10°C (50°F) Blower switch off → LO      		 Below 1 V → 11 to 14V
      E36-26 (PTC2) - Body ground R - Body ground PTC2 heater relay operation signal
      E36-35 (PTC3) - Body ground R - Body ground PTC3 heater relay operation signal
      E36-17 (BLWH) - E36-1 (GND) L - W-B Blower motor control signal (rear) Engine switch on (IG) Blower switch LO Pulse generation (see  g waveform 3)
      E36-19 (RMGV) - E36-1 (GND) B - W-B Rear cooling unit expansion valve signal Engine switch on (IG) 11 to 14 V

      If the result is not as specified, the air conditioning amplifier assembly may have a malfunction.

    5. Using an oscilloscope, check waveform 1.

      A/C Compressor Lock Sensor Signal 

      A/C COMPRESSOR LOCK SENSOR SIGNAL REFERENCE CHART

      Item Content
      Terminal No. (Symbol) E35-28 (LOCK) - E35-29 (SG-5)
      Tool Setting 200 mV/DIV., 10 ms/DIV.
      Condition Engine is running
      Blower switch: LO
      A/C switch: ON

      HINT:

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

      Fig 2: A/C Compressor Lock Sensor Signal Waveform
      G05418333Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Blower Motor Control Signal 

      BLOWER MOTOR CONTROL SIGNAL REFERENCE CHART

      Item Content
      Terminal No. (Symbol) E36-3 (BLW) - E36-1 (GND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Condition Engine switch on (IG), Blower switch LO
      Fig 3: Blower Motor Control Signal Waveform
      G05635336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

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

    7. Using an oscilloscope, check waveform 3.

      Rear Blower Motor Control Signal 

      REAR BLOWER MOTOR CONTROL SIGNAL REFERENCE CHART

      Item Content
      Terminal No. (Symbol) E36-17 (BLWH) - E36-1 (GND)
      Tool Setting 1 V/DIV., 500 μs/DIV.
      Condition Engine switch on (IG), Blower switch LO

      HINT:

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

      Fig 4: Rear Blower Motor Control Signal Waveform
      G05635336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK AIR CONDITIONING CONTROL ASSEMBLY (w/o Multi-display) 
    Fig 5: Identifying F10 Air Conditioning Control Assembly Connector Terminals
    G05636434Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the F10 air conditioning control assembly connector.
    2. Measure the resistance and voltage according to the value (s) in the table below.
      TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F10-7 (IG+) - F10-1 (GND) G - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      F10-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the F10 air conditioning control assembly connector.
    4. Measure the resistance and voltage according to the value (s) in the table below.
      TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F10-12 (DTP+) - F10-1 (GND) R - W-B Temperature up switch signal Switch not pressed Below 1 V
      Switch pressed Alternating between 3.5 V or higher and below 1 V
      F10-10 (PTP+) - F10-1 (GND) L - W-B Temperature up switch signal Switch not pressed Below 1 V
      Switch pressed Alternating between 3.5 V or higher and below 1 V
      F10-9 (S5) - F10-1 (GND) B - W-B Signal ground Always Below 1 Ω
      F10-11 (DTP-) - F10-1 (GND) G - W-B Temperature down switch signal Switch not pressed Below 1 V
      Switch pressed Alternating between 3.5 V or higher and below 1 V
      F10-3 (PTP-) - F10-1 (GND) W - W-B Temperature down switch signal Switch not pressed Below 1 V
      Switch pressed Alternating between 3.5 V or higher and below 1 V
      F10-2 (SG) - F10-1 (GND) GR - W-B Signal ground Always Below 1 Ω

      If the result is not as specified, the air conditioning control assembly may have a malfunction.

  3. CHECK MULTI-DISPLAY (w/ Multi-display) 
    Fig 6: Identifying F28 Multi-Display Connector Terminals
    G05635339Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the F28 multi-display connector.
    2. Measure the resistance and voltage according to the value (s) in the table below.
      TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F28-3 (IG) - F28-10 (GND1) G - W-B Ignition power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      F28-1 (+B1) - F28-10 (GND1) R - W-B Battery power source Always 11 to 14 V
      F28-10 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

    3. Reconnect the F28 multi-display connector.
    4. Measure the resistance and voltage according to the value (s) in the table below.
      TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F31-2 (TEC+) - F28-10 (GND1) R - W-B Temperature up switch signal Switch not pressed Below 1 V
      Switch pressed Alternating between 3.5 V or higher and below 1 V
      F31-3 (TES+) - F28-10 (GND1) L - W-B Temperature up switch signal Switch not pressed Below 1 V
      Switch pressed Alternating between 3.5 V or higher and below 1 V
      F31-5 (AGND) - F28-10 (GND1) B - N-B Signal ground Always Below 1 Ω
      F31-6 (TEC-) - F28-10 (GND1) G - W-B Temperature down switch signal Switch not pressed Below 1 V
      Switch pressed Alternating between 3.5 V or higher and below 1 V
      F31-7 (TES-) - F28-10 (GND1) W - W-B Temperature down switch signal Switch not pressed Below 1 V
      Switch pressed Alternating between 3.5 V or higher and below 1 V
      F31-8 (BGND) - F28-10 (GND1) GR - W-B Signal ground Always Below 1 Ω

      If the result is not as specified, the multi-display may have a malfunction.

  4. CHECK NO. 2 AIR CONDITIONING CONTROL ASSEMBLY 
    Fig 7: Identifying E55 Switch Connector Terminals
    G05639349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E55 switch connector.
    2. Measure the resistance and voltage according to the value (s) in the table below.
      TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E55-6 (IG) - E55-1 (E) G - W-B Ignition power supply Always 11 to 14 V
      E55-1 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω

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

  5. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) 
    Fig 8: Identifying Main Body ECU Connector Terminals (Cowl Side Junction Block LH)
    G05635341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 2A, 2B, 2D and E3 ECU connectors.
    2. Measure the voltage and resistance according to the value (s) in the table below.
      TERMINAL REFERENCE CHART

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      2B-20 (BATB) - Body ground L - Body ground Battery power supply Always 11 to 14 V
      2A-1 (ACC) - Body ground GR - Body ground ACC power supply Engine switch on (ACC) 11 to 14 V
      2A-1 (ACC) - Body ground GR - Body ground ACC power supply Engine switch off Below 1 V
      2D-62 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      E3-1 (GND3) - Body ground BR - Body ground Ground Always Below 1 Ω

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

scientia non olet · About LEMON Manuals