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Terminals Of Ecu [05/2014 - ]

  1. CHECK COMBINATION METER ASSEMBLY 
    1. Measure the voltage and resistance according to the value(s) in the table below.
      Fig 1: Combination Meter Assembly Connector Terminal Identification
      GTY314190Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Terminal No. Wiring Color Terminal Description Condition Specified Condition
      C50-1 (S) - Body ground B - Body ground Oil pressure switch signal Ignition switch ON, oil pressure warning light off 11 to 14 V
      Ignition switch ON, oil pressure warning light on Below 1 V
      C50-2 (CHG-) - Body ground BE - Body ground Charge warning light signal Ignition switch ON, charge warning light off 11 to 14 V
      Ignition switch ON, charge warning light on Below 1 V
      C50-4 (SW) - Body ground Y - Body ground Fluid level warning switch signal Ignition switch ON, fluid level warning switch off 11 to 14 V
      Ignition switch ON, fluid level warning switch on Below 1 V
      C50-5 (B) - Body ground W - Body ground Battery Always 11 to 14 V
      C50-6 (IG+) - Body ground Y - Body ground Ignition switch signal Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      C50-7 (ET) - Body ground W-B - Body ground Ground Always Below 1 Ω
      C50-8 (CANH) - Body ground GR - Body ground CAN communication signal Ignition switch off 200 Ω or higher
      C50-9 (CANL) - Body ground W - Body ground CAN communication signal Ignition switch off 200 Ω or higher
      C50-10 (E) - Body ground V - Body ground Fuel sender gauge ground Always Below 1 Ω
      C50-11 (L) - Body ground P - Body ground Fuel sender gauge signal Fuel F (full tank) → E (empty) 15 Ω → 410 Ω
      C50-12 (TX1+) - Body ground G - Body ground Ambient temperature sensor signal Outside temperature 25°C (77°F) 1.28 to 1.38 V
      C50-13 (TEMP) - Body ground W - Body ground Ambient temperature sensor signal ground Always Below 1 V
      C50-15 (WLVL) - Body ground*1 LG - Body ground Washer level warning switch signal Ignition switch ON, washer level warning light off 11 to 14 V
      Ignition switch ON, washer level warning light on Below 1 V
      C50-16 (TIRE) - Body ground*2 B - Body ground Tire pressure warning light signal Ignition switch ON, tire pressure warning light off 3.2 V or higher
      Ignition switch ON, tire pressure warning light on Below 3.2 V
      C50-17 (B) - Body ground BE - Body ground Turn signal LH Ignition switch ON, turn signal switch neutral position Below 1 V
      Ignition switch ON, turn LH indicator light blinks Below 1 V ←→ 11 to 14 V
      C50-18 (+) - Body ground R - Body ground Hi beam signal BEAM indicator light off Below 1 V
      BEAM indicator light on 11 to 14 V
      C50-19 (-) - Body ground*3 BR - Body ground Hi beam signal ground Always Below 1 Ω
      C50-19 (-) - Body ground*4 BR - Body ground Hi beam signal ground Light control switch head, BEAM indicator light off 11 to 14 V
      Light control switch head, BEAM indicator light on Below 1 V
      C50-20 (CHK) - Body ground P - Body ground MIL (Malfunction Indicator Lamp) signal Ignition switch ON, MIL (Malfunction Indicator Lamp) off 11 to 14 V
      Ignition switch ON, MIL (Malfunction Indicator Lamp) on Below 1 V
      C50-21 (B) - Body ground B - Body ground Turn signal RH Ignition switch ON, turn signal switch neutral position Below 1 V
      Ignition switch ON, turn RH indicator light blinks Below 1 V ←→ 11 to 14 V
      C50-25 (ILL-) - Body ground W - Body ground Illumination signal Light control switch TAIL, light control rheostat position MIN → MAX Below 1 V → 11 to 14 V
      C50-26 (EP) - Body ground BR - Body ground Ground Always Below 1 Ω
      C50-28 (HEAD) - Body ground*3 L - Body ground HEAD indicator signal Light control switch off 11 to 14 V
      Light control switch TAIL Below 1 V
      C50-29 (ILL+) - Body ground G - Body ground Illumination signal Light control switch off Below 1 V
      Light control switch TAIL 11 to 14 V
      C50-31 (SI) - Body ground V - Body ground Speed signal for other systems (Input) Ignition switch ON, front wheel turned slowly Pulse generation (See waveform 1, Fig 2)
      C50-32 (+S) - Body ground SB - Body ground Speed signal for other systems (Output) Ignition switch ON, front wheel turned slowly Pulse generation (See waveform 1, Fig 2)
      • *1: w/ Washer Level Warning Light
      • *2: w/ Tire Pressure Warning System
      • *3: w/o Daytime Running Light
      • *4: w/ Daytime Running Light
    2. Using an oscilloscope, check the signal waveform of the meter.
      Fig 2: Identifying Waveform 1
      GTY311134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 1 (REFERENCE)

      Item Condition
      Tester connection C50-31 (SI) - Body ground
      Tool setting 5 V/DIV., 20 ms./DIV.
      Vehicle condition Driving at approx. 20 km/h (12 mph)

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by A in the illustration narrows.

  2. COMBINATION METER ASSEMBLY INNER CIRCUIT 
    Fig 3: Combination Meter Assembly Inner Circuit Diagram (1 Of 3)
    GTY471969Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 4: Combination Meter Assembly Inner Circuit Diagram (2 Of 3)
    GTY313800Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: Combination Meter Assembly Inner Circuit Diagram (3 Of 3)
    GTY471973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TABLE OF TERMINAL CONNECTION

    Terminal No. Wire Harness Side
    C50 1 Oil pressure switch
    2 Generator
    3 -
    4 Brake fluid level warning switch
    5 ECU-B fuse
    6 MET fuse
    7 Ground
    8 CAN communication line
    9 CAN communication line
    10 Fuel sender gauge assembly
    11 Fuel sender gauge assembly
    12 Thermistor (Ambient temperature sensor)
    13 Thermistor (Ambient temperature sensor)
    14 -
    15 Level warning switch*1
    16 Tire pressure warning ECU*2
    17 Turn signal flasher assembly
    18 H-LP RH-HI fuse
    19 Ground
    20 ECM
    21 Turn signal flasher assembly
    22 -
    23 -
    24 -
    25 Illumination parts
    26 Ground
    27 -
    28*4 H-LP RH-LO fuse
    29 PANEL fuse
    30 -
    31 Skid control ECU
    32 Vehicle speed control parts
    • *1: w/ Washer Level Warning Light
    • *2: w/ Tire Pressure Warning System
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