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Terminals Of Ecu

  1. CHECK COMBINATION METER 
    Fig 1: Identifying Combination Meter Connector Terminals
    GTY150273Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    IG+ (K31-1) - Body ground R - Body ground Power switch signal Power switch OFF Below 1 V
    Power switch ON (IG) 10 to 14 V
    B (K31-2) - Body ground G - Body ground Turn signal L Power switch ON (IG), turn signal LH indicator light OFF Below 1 V
    Power switch ON (IG), turn signal LH indicator light ON 10 to 14 V
    B (K31-3) - Body ground BE - Body ground Turn signal R Power switch ON (IG), turn signal RH indicator light OFF Below 1 V
    Power switch ON (IG), turn signal RH indicator light ON 10 to 14 V
    MPX- (K31-5) - Body ground SB - Body ground Multiplex communication circuit - -
    EFI (K31-8) - Body ground R - Body ground MIL MIL ON Below 4.2 V
    MIL OFF 10 to 14 V
    +S (K31-9) - Body ground LG - Body ground Speed signal (Output) Power switch ON (IG) and turn the wheel slowly Pulse generation (See Fig 3waveform 2)
    FUWI* (K31-12) - Body ground BE - Body ground Fuel lid open switch signal Power switch ON (IG), fuel lid open switch OFF → ON 10 to 14 V → Below 1
    FUCI* (K31-13) - Body ground SB - Body ground Fuel lid open switch signal Power switch ON (IG), fuel lid open switch ON → OFF 10 to 14 V → Below 1
    MSSL (K31-15) - Body ground B - Body ground Steering pad switch signal Mode change switch OFF Below 1 V
    Mode change switch ON 10 to 14 V
    MSS (K31-16) - Body ground W - Body ground Sunlight sensor signal Meter is starting up 1 to 3.8 V
    MSG (K31-18) - Body ground R - Body ground Ground Always Below 1 Ω
    FE (K31-19) - Body ground Y - Body ground Ground Always Below 1 Ω
    ES (K31-20) - Body ground V - Body ground Ground Always Below 1 Ω
    B (K31-21) - Body ground P - Body ground Battery Always 10 to 14 V
    B (K31-22) - Body ground L - Body ground Battery Always 10 to 14 V
    MPX+ (K31-25) - Body ground GR - Body ground Multiplex communication circuit - -
    PMT1 (K31-27) - Body ground L - Body ground Power meter signal Engine running Pulse generation (See Fig 2waveform 1)
    SI (K31-29) - Body ground V - Body ground Speed signal (Input) Power switch ON (IG) and turn the wheel slowly Pulse generation (See Fig 3waveform 2)
    TR (K31-30) - Body ground G - Body ground Illumination signal Power switch ON (IG) Pulse generation
    PBLT (K31-31) - Body ground SB - Body ground Seat belt condition signal (Passenger side) Passenger seat belt indicator is OFF Below 1 V
    Passenger seat belt indicator is blinks 10 to 14 V
    FR (K31-34) - Body ground BR - Body ground Fuel level signal Power switch ON (IG), fuel level is FULL Below 1 V
    Power switch ON (IG), fuel level is EMPTY 4 to 7 V
    MS5 (K31-36) - Body ground B - Body ground Power source for sunlight sensor Meter is starting up 4.7 to 5.2 V
    E2 (K31-40) - Body ground W-B - Body ground Ground (Power ground) Always Below 1 Ω

    HINT: 

    *: for U.S.A.

    1. Using an oscilloscope, check the waveform 1.
      Fig 2: Oscilloscope Waveform 1 Reference
      GTY128614Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 1 (REFERENCE)

      Item Condition
      Symbols (Terminal No.) PMT1 (K31-27) - Body ground
      Tool setting 5 V/DIV., 10 msec./DIV.
      Vehicle condition Engine idle speed
    2. Using an oscilloscope, check the waveform 2.
      Fig 3: Oscilloscope Waveform 2 Reference
      GTY128814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM 2 (REFERENCE)

      Item Condition
      Symbols (Terminal No.) +S (K31-9) - Body ground
      SI (K31-29) - Body ground
      Tool setting 5 V/DIV., 20 msec./DIV.
      Vehicle condition Driving at approx. 20 km/h (12 mph)

      HINT: 

      As vehicle speed increases, the cycle of the signal waveform narrows.

    TELLTALE LIGHT

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    TURN-L (z2-1) - Body ground B - Body ground Turn signal L Power switch ON (IG), turn signal LH indicator light OFF Below 1 V
    Power switch ON (IG), turn signal LH indicator light ON 10 to 14 V
    TURN-R (z2-2) - Body ground B - Body ground Turn signal R Power switch ON (IG), turn signal RH indicator light OFF Below 1 V
    Power switch ON (IG), turn signal RH indicator light ON 10 to 14 V
    DOME+B-L (z2-3) - Body ground R- Body ground Battery R Always 10 to 14 V
    SLIP (z2-5) - Body ground BR - Body ground Slip signal Power switch ON (IG), slip indicator is OFF 10 to 14 V
    Power switch ON (IG), slip indicator is blinking Below 1 V
    SEAT BELT (z2-6) - Body ground Y - Body ground Seat belt condition signal (Driver side) Power switch ON (IG), driver seat belt indicator is OFF 10 to 14 V
    Power switch ON (IG), driver seat belt indicator is blinks Below 1 V
    AIRBAG (z2-7) - Body ground O - Body ground Airbag signal Power switch ON (IG), airbag indicator is OFF 10 to 14 V
    Power switch ON (IG), airbag indicator is blinking Below 1 V
    BEAM (z2-8) - Body ground Y - Body ground BEAM signal BEAM switch OFF 10 to 14 V
    BEAM switch ON Below 1 V
    IG-L (z2-10) - Body ground L - Body ground Power switch signal R Power switch OFF Below 1 V
    Power switch ON (IG) 10 to 14 V
    IG-R (z2-11) - Body ground R - Body ground Power switch signal L Power switch OFF Below 1 V
    Power switch ON (IG) 10 to 14 V
    DOME+B-R (z2-12) - Body ground L - Body ground Battery L Always 10 to 14 V
    FR FOG (z2-14) - Body ground O - Body ground Front fog signal Front fog switch OFF 10 to 14 V
    Fr Fog switch ON Below 1 V
    DOOR (z2-15) - Body ground BR - Body ground Door courtesy switch signal Door indicator OFF 10 to 14 V
    Door indicator ON Below 1 V
    TAIL HEAD (z2-16) - Body ground G - Body ground Tail signal Tail signal switch OFF 10 to 14 V
    Tail signal switch ON Below 1 V
    TURN L-G (z2-17) - Body ground W- Body ground Ground Always Below 1 Ω
    TURN R-G (z2-18) - Body ground W- Body ground Ground Always Below 1 Ω
  2. CHECK SKID CONTROL ECU 
    Fig 4: Identifying Skid Control ECU Connector Terminals
    GTY118224Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    SP1 (A13-7) - Body ground V-Y - Body ground Speed signal Power switch ON (IG), and turn wheel slowly Pulse generation (See waveform below)
    1. Using an oscilloscope, check the waveform.
      Fig 5: Identifying Waveform
      GTY117871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM (REFERENCE)

      Item Condition
      Symbols (Terminal No.) SP1 (A13-7) - Body ground
      Tool setting 5 V/DIV., 20 msec./DIV.
      Vehicle condition Driving at approx. 20 km/h (12 mph)
  3. CHECK HYBRID VEHICLE CONTROL ECU 
    Fig 6: Identifying Hybrid Vehicle Control ECU Connector Terminals
    GTY145535Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    PMET (A54-78) - Body ground L - Body ground POWER METER signal Engine is running Pulse generation (See waveform below)
    1. Using an oscilloscope, check the waveform.
      Fig 7: Identifying Waveform
      GTY117871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      WAVEFORM (REFERENCE)

      Item Condition
      Symbols (Terminal No.) PMET (A54-78) - Body ground
      Tool setting 5 V/DIV., 20 msec./DIV.
      Vehicle condition Driving at approx. 20 km/h (12 mph)
  4. CHECK COMBINATION METER INNER CIRCUIT 
    Fig 8: View Of Combination Meter Inner Circuit Diagram (1 Of 3)
    GTY256853Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 9: View Of Combination Meter Inner Circuit Diagram (2 Of 3)
    GTY124956Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 10: View Of Combination Meter Inner Circuit Diagram (3 Of 3)
    GTY123856Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    This diagram shows all the indicators that are provided, which may differ from the actual vehicle.

    Terminal No. Wire Harness Side
    K31 (1) GAUGE Fuse
    K31 (2) Turn Signal Flasher (L)
    K31 (3) Turn Signal Flasher (R)
    K31 (4) -
    K31 (5) Network Gateway ECU
    K31 (6) -
    K31 (7) -
    K31 (8) ECM
    K31 (9) Parts that uses speed signals (Stereo Component Amplifier, ECM)
    K31 (10) -
    K31 (11) -
    K31 (12) ECM
    K31 (13) ECM
    K31 (14) -
    K31 (15) Steering Pad Switch
    K31 (16) Automatic Light Control Sensor
    K31 (17) -
    K31 (18) Automatic Light Control Sensor
    K31 (19) Fuel Sender Gauge
    K31 (20) Ground (Signal Ground)
    K31 (21) MPX-B Fuse
    K31 (22) DOME Fuse
    K31 (23) -
    K31 (24) -
    K31 (25) Network Gateway ECU
    K31 (26) -
    K31 (27) Hybrid Vehicle Control ECU
    K31 (28) -
    K31 (29) Skid Control ECU
    K31 (30) PANEL Fuse
    K31 (31) Display and Navigation Module Display
    K31 (32) -
    K31 (33) -
    K31 (34) Fuel Sender Gauge
    K31 (35) -
    K31 (36) Automatic Light Control Sensor
    K31 (37) -
    K31 (38) -
    K31 (39) -
    K31 (40) Ground
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