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Terminals Of Ecu

  1. COMBINATION METER ASSEMBLY 
    Fig 1: Identifying Combination Meter Assembly Connector Terminals
    G05420376Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    CONNECTOR TERMINAL REFERENCE TABLE

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    E1-1 (IG+) - Body ground O - Body ground Ignition switch signal Ignition switch off Below 1 V
    Ignition switch on (IG) 11 to 14 V
    E1-2 (B) - Body ground G - Body ground Turn indicator light signal Ignition switch on (IG), turn signal LH indicator light OFF Below 1 V
    Ignition switch on (IG), turn signal LH indicator light ON 11 to 14 V
    E1-3 (B) - Body ground GR - Body ground Turn indicator light signal Ignition switch on (IG), turn signal RH indicator light OFF Below 1 V
    Ignition switch on (IG), turn signal RH indicator light ON 11 to 14 V
    E1-4 (SW1) - Body ground B - Body ground Light control rheostat signal (Tail cancel switch) Ignition switch on (IG), turn the light control rheostat knob fully downwards (Tail cancel off) Below 1 V
    Ignition switch on (IG), turn the light control knob rheostat fully upwards (Tail cancel on) 4 to 6 V
    E1-7 (S) - Body ground Y - Body ground Oil pressure warning light signal Ignition switch on (IG), oil pressure warning light OFF 11 to 14 V
    Ignition switch on (IG), oil pressure warning light ON Below 15 V
    E1-8 (WLVL) - Body ground P - Body ground Washer level warning light signal Ignition switch on (IG), WASHER warning light OFF 11 to 14 V
    Ignition switch on (IG), WASHER warning light ON Below 15 V
    E1-9 (+S) - Body ground LG - Body ground Speed signal for other system (Output) Turn the wheel slowly Pulse generation (See  a waveform)
    E1-10 (CHK) - Body ground W - Body ground MIL (Check engine warning light) signal Ignition switch on (IG), MIL ON Below 1 V
    Ignition switch on (IG), MIL OFF 11 to 14 V
    E1-14 (MSSL) - Body ground P - Body ground Steering pad switch signal Ignition switch on (IG), DISP switch OFF 4 to 6 V
    Ignition switch on (IG), DISP switch ON Below 1 V
    E1-16 (LCL+) ((1)) - Body ground SB - Body ground Multi-information display signal Ignition switch off Below 1 V
    Ignition switch on (IG) 11 to 14 V
    E1-17 (LCL-) ((1)) - Body ground G - Body ground Multi-information display signal Ignition switch off Below 1 V
    Ignition switch on (IG) 11 to 14 V
    E1-18 (E3) - Body Ground W-B - Body ground Ground Always Below 1 V
    E1-19 (FE) - Body ground W-B - Body ground Ground (Fuel ground) Always Below 1 V
    E1-20 (ES) - Body ground R - Body ground Ground (Signal ground) Always Below 1 V
    E1-21 (B) - Body ground SB - Body ground Battery Always 11 to 14 V
    E1-22 (B2) - Body ground BR - Body ground Battery Always 11 to 14 V
    E1-23 (TC) - Body ground R - Body ground Light control rheostat signal (Tail cancel switch) Ignition switch on (IG), turn the light control rheostat knob fully downwards 4 to 6 V
    Ignition switch on (IG), turn the light control rheostat knob fully upwards Below 1 V
    E1-24 (SW2) - Body ground BR - Body ground Light control rheostat signal Ignition switch on (IG), rheostat knob position is on MIN Below 1 V
    Ignition switch on (IG), rheostat knob position is on MAX 4 to 6 V
    E1-25 (CANH) - Body ground P - Body ground CAN communication line - -
    E1-26 (CANL) - Body ground W - Body ground CAN communication line - -
    E1-28 (B/LE) - Body ground SB - Body ground Brake fluid level warning light signal Ignition switch on (IG), BRAKE warning light OFF 11 to 14 V
    Ignition switch on (IG), BRAKE warning light ON Below 15 V
    E1-29 (SI) - Body ground BR - Body ground Speed signal for other system (Input) Ignition switch on (IG), turn the wheel slowly. Pulse generation (See  a waveform)
    E1-30 (ILL-) - Body ground R - Body ground Illumination signal Ignition switch on (IG), light control switch is in the HEAD/TAIL position 11 to 14 V
    E1-31 (PBLT) - Body ground BR - Body ground Passenger seat belt warning light signal Sit on the passenger seat, ignition switch on (IG), passenger seat belt warning light OFF 11 to 14 V
    Sit on the passenger seat, ignition switch on (IG), front passenger side seat belt warning light is blinking Below 1 V
    E1-32 (CHG-) - Body ground V - Body ground Charge warning light signal Ignition switch on (IG), charge warning light ON Below 1.5 V
    Ignition switch on (IG), charge warning light OFF 11 to 14 V
    E1-33 (TIRE) ((2)) - Body ground Y - Body ground Tire pressure warning signal Ignition switch on (IG), tire pressure warning light ON 8 to 15 V
    Ignition switch on (IG), tire pressure warning light OFF Below 1.5 V
    E1-34 (FR) - Body ground GR - Body ground Fuel signal Ignition switch on (IG), fuel level is FULL Below 2 V
    Ignition switch on (IG), fuel level is EMPTY 4 to 7 V
    E1-36 (MCLK) ((1)) - Body ground R - Body ground Multi-information display signal Ignition switch on (IG) Pulse generation
    E1-37 (MDAT) ((1)) - Body ground Y - Body ground Multi-information display signal Ignition switch on (IG) Pulse generation
    E1-38 (SYNC) ((1)) - Body ground L - Body ground Multi-information display signal Ignition switch on (IG) Pulse generation
    E1-39 (SW3) - Body ground P - Body ground Light control rheostat signal Ignition switch on (IG), rheostat knob position is on MIN Below 1 V
    Ignition switch on (IG), rheostat knob position is on MAX 4 to 6 V
    E1-40 (E2) - Body Ground W- Body ground Ground (Power ground) Always Below 1 V
    (1) w / Multi-information Display
    (2) w / Tire Pressure Warning System
    1. Waveform (Reference): Using oscilloscope:
      WAVEFORM REFERENCE TABLE

      Item Condition
      Tool setting 5V/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 shown below by (A) narrows.

      Fig 2: Identifying Waveform Graph
      G05420377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. COMBINATION METER INNER CIRCUIT 
    1. Combination Meter Inner Circuit E1-40 (E2)
      Fig 3: Identifying Combination Meter Inner Circuit Diagram (1 Of 3)
      G05420378Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 4: Identifying Combination Meter Inner Circuit Diagram (2 Of 3)
      G05420379Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 5: Identifying Combination Meter Inner Circuit Diagram (3 Of 3)
      G05420380Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      CONNECTOR TERMINAL REFERENCE TABLE

      Terminal No. Wire Harness Side
      E1 1 No. 2 Gauge Fuse (IG+)
      2 Turn Signal Flasher (B)
      3 Turn Signal Flasher (B)
      4 Light Control Rheostat (SW1)
      5 -
      6 -
      7 Oil Pressure Switch (S)
      8 Washer Level Warning Switch (WLVL)
      9 Each part that uses speed signal (+S)
      10 ECM (CHK)
      11 -
      12 -
      13 -
      14 Steering Pad Switch (MSSL)
      15 -
      16 Clock Assembly (LCL+) ((2))
      17 Clock Assembly (LCL-) ((2))
      18 Ground (E3)
      19 Fuel Sender Gauge Assembly (FE)
      20 Ground (ES)
      21 ECU-B Fuse (B)
      22 DOME Fuse (B2)
      23 Light Control Rheostat (TC)
      24 Light Control Rheostat (SW2)
      25 CAN Communication Line (CANH)
      26 CAN Communication Line (CANL)
      27 -
      28 Brake Fluid Level Warning Switch (B/LE)
      29 Skid Control ECU (SI)
      30 ALTER Fuse (ILL-)
      31 Hazard Warning Switch (PBLT)
      32 Generator (CHG-)
      33 Tire Pressure Warning ECU (TIRE) ((1))
      34 Fuel Sender Gauge Assembly (FR)
      35 -
      36 Clock Assembly (MCLK) ((2))
      37 Clock Assembly (MDAT) ((2))
      38 Clock Assembly (SYNC) ((2))
      39 Light Control Rheostat (SW3)
      40 Ground (E2)
      (1) w/ Tire Pressure Warning System
      (2) w/ Multi-information Display
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