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Terminals Of Ecu

  1. CHECK COMBINATION METER ASSEMBLY 
    Fig 1: Identifying ECU Terminals
    G05807477Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TERMINAL DESCRIPTION CHART

    Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    IG (K31-1) - Body ground R - Body ground Engine switch signal Engine switch off Below 1 V
    Engine switch on (IG) 10 to 14 V
    TURN (K31-2) - Body ground G - Body ground Turn signal L Engine switch on (IG), turn signal LH indicator light OFF Below 1 V
    Engine switch on (IG), turn signal LH indicator light ON 10 to 14 V
    TURN (K31-3) - Body ground O - Body ground Turn signal R Engine switch on (IG), turn signal RH indicator light OFF Below 1 V
    Engine switch on (IG), turn signal RH indicator light ON 10 to 14 V
    MPX (K31-5) - Body ground SB - Body ground Multiplex communication circuit - -
    CHK E/G(K31-8) - Body ground R - Body ground MIL MIL ON Below 4.2 V
    MIL OFF 10 to 14 V
    4P (K31-9) - Body ground LG - Body ground Speed signal (Output) Engine switch on (IG) and turn the wheel slowly Pulse generation (See  bwaveform 2)
    MODE CHANGE SW (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
    PH (K31-16) - Body ground W - Body ground Sunlight sensor signal Meter is starting up 1 to 3.8 V
    PH GND (K31-18) - Body ground R - Body ground Ground Always Below 1 Ω
    FUEL SENDER FE (K31-19) - Body ground Y - Body ground Ground Always Below 1 Ω
    S-GND (K31-20) - Body ground V - Body ground Ground Always Below 1 Ω
    MPX-B (+B) (K31-21) - Body ground P - Body ground Battery Always 10 to 14 V
    DOME- (K31-22) - Body ground L - Body ground Battery Always 10 to 14 V
    MPX+ (K31-25) - Body ground GR - Body ground Multiplex communication circuit - -
    TACHO (K31-27) - Body ground L - Body ground Tachometer signal Engine running Pulse generation (See  awaveform 1)
    BRAKE LEVEL SW (K31-28) - Body ground Y - Body ground Brake fluid level signal Brake fluid level warning light ON Below 1 V
    Brake fluid level warning light OFF 10 to 14 V
    SPEED (K31-29) - Body ground V - Body ground Speed signal (Input) Engine switch on (IG) and turn the wheel slowly Pulse generation (See  bwaveform 2)
    ILL (K31-30) - Body ground G - Body ground Illumination signal Engine switch on (IG) Pulse generation
    P SEAT BELT OUTPUT (K31-31) - Body ground O - 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
    FUEL SENDER FR(K31-34) - Body ground BR - Body ground Fuel level signal Engine switch on (IG), fuel level is FULL Below 1 V
    Engine switch on (IG), fuel level is EMPTY 4 to 7 V
    PH5V (K31-36) - Body ground B - Body ground Power source for sunlight sensor Meter is starting up 4.7 to 5.2 V
    P-GND (K31-40) - Body ground W-B - Body ground Ground (Power ground) Always Below 1 Ω
    1. Waveform 1 (Reference): Using an oscilloscope
      WAVEFORM REFERENCE CHART

      Item Condition
      Symbols (Terminal No.) TACHO (K31-27) - Body ground
      Tool setting 5V/DIV., 10 ms/DIV
      Vehicle condition Engine idle speed
      Fig 2: Waveform 1 Graph
      G05299319Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Waveform 2 (Reference): Using an oscilloscope
      WAVEFORM REFERENCE CHART

      Item Condition
      Symbols (Terminal No.) 4P (K31-9) - Body ground SPEED (K31-29) - Body ground
      Tool setting 5 V/DIV., 20 ms/DIV
      Vehicle condition Driving at approx. 20 km/h (12 mph)
      Fig 3: Waveform 2 Graph
      G05299320Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

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

      TELLTALE LIGHT ASSEMBLY 

      TERMINAL DESCRIPTION CHART

      Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      TURN-L(z2-1) - Body ground B - Body ground Turn signal L Engine switch on (IG), turn signal LH indicator light OFF Below 1 V
      Engine 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 Engine switch on (IG), turn signal RH indicator light OFF Below 1 V
      Engine switch on (IG), turn signal RH indicator light ON 10 to 14 V
      DOME+B-L (22-3) - Body ground R- Body ground Battery R Always 10 to 14 V
      SLIP (z2-5) - Body ground BR - Body ground Slip signal Engine switch on (IG), slip indicator is OFF 10 to 14 V
      Engine 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) Engine switch on (IG), driver seat belt indicator is OFF 10 to 14 V
      Engine switch on (IG), driver seat belt indicator is blinks Below 1 V
      AIRBAG (Z2-7) - Body ground O - Body ground Airbag signal Engine switch on (IG), airbag Indicator is OFF 10 to 14 V
      Engine 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 Engine switch signal R Engine switch off Below 1 V
      Engine switch on (IG) 10 to 14 V
      IG-R (z2-11) - Body ground R - Body ground Engine switch signal L Engine switch off Below 1 V
      Engine 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 Fr fog signal Fr 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 (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 (1 Of 2)
    G05807480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: Identifying Skid Control ECU Connector Terminals (2 Of 2)
    G05807481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    1UR-FSE 

    TERMINAL DESCRIPTION CHART

    Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    SP1 (A13-7) - Body ground V-Y - Body ground Speed signal Engine switch on (IG), and turn wheel slowly Pulse generation (See  awaveform 2)

    2GR-FSE 

    TERMINAL DESCRIPTION CHART

    Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    SP1 (K93-9) - Body ground V-Y - Body ground Speed signal Engine switch on (IG), and turn wheel slowly Pulse generation (See  awaveform 2)
    1. Waveform 2 (Reference): Using an oscilloscope
      WAVEFORM REFERENCE CHART

      Item Condition
      Symbols (Terminal No.) SP1 (A13-7) - Body ground
      SP1 (K93-9) - Body ground
      Tool setting 5 V/DIV., 20 ms/DIV
      Vehicle condition Driving at approx. 20 km/h (12 mph)
  3. CHECK ECM 
    Fig 6: Identifying ECM Connector Terminals (1 Of 2)
    G05807482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 7: Identifying ECM Connector Terminals (2 Of 2)
    G05807483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    1UR-FSE 

    TERMINAL DESCRIPTION CHART

    Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    TACH (A7-16) - Body ground W-L - Body ground Tachometer signal Engine is running Pulse generation (See  awaveform 1)

    2GR-FSE 

    TERMINAL DESCRIPTION CHART

    Symbol (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    TACH (A6-15) - Body ground W-L - Body ground Tachometer signal Engine is running Pulse generation (See  awaveform 1)
    1. Waveform 1 (Reference): Using an oscilloscope
      WAVEFORM REFERENCE CHART

      Item Condition
      Symbols (Terminal No.) TACHO (A7-16) - Body ground
      TACHO (A6-15) - Body ground
      Tool setting 5 V/DIV., 20 ms/DIV
      Vehicle condition Driving at approx. 20 km/h (12 mph)
      Fig 8: Identifying Waveform 1 Graph
      G05299320Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK COMBINATION METER INNER CIRCUIT 
    Fig 9: Combination Meter Inner Circuit Diagram (1 Of 2)
    G05807485Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 10: Combination Meter Inner Circuit Diagram (2 Of 2)
    G05807486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    INDICATORS TERMINALS REFERENCE CHART

    Terminal No. Wire Harness Side
    K31 (1) ECU-IG Fuse
    K31 (2) Turn Signal Flasher (L)
    K31 (3) Turn Signal Flasher (R)
    K31 (4) -
    K31 (5) 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) -
    K31 (13) -
    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) Gateway ECU
    K31 (26) -
    K31 (27) ECM
    K31 (28) Brake Fluid Level Warning Switch
    K31 (29) Skid Control ECU
    K31 (30) PANEL Fuse
    K31 (31) Passenger Seat Belt Warning Light
    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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