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Terminals Of Ecu

  1. COMBINATION METER 
    Fig 1: Identifying Combination Meter Connector Terminal
    GTY208636Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E46-1 (WRNP) - Body ground O*1 or W*2 - Body ground Front passenger side seat belt warning light signal Front passenger seat occupied, ignition switch ON, front passenger side seat belt warning light OFF 11 to 14 V
      Front passenger seat occupied, ignition switch ON, front passenger side seat belt warning light is blinking Below 1 V ←→ 11 to 14 V
      E46-2 (WLVL)*3 - Body ground BE - Body ground Washer level warning light signal Ignition switch ON, washer level warning light OFF 11 to 14 V
      Ignition switch ON, washer level warning light ON Below 1 V
      E46-3 (-) - Body ground L - Body ground Headlight Hi-beam indicator light signal Always Below 1 V
      E46-4 (+) - Body ground R - Body ground Headlight Hi-beam indicator light signal Hi-beam switch OFF 11 to 14 V
      Hi-beam switch ON Below 1 V
      E46-5 (B) - Body ground L - Body ground Turn indicator light signal Ignition switch ON, turn signal RH indicator light OFF Below 1 V
      Ignition switch ON, turn signal RH indicator light ON 11 to 14 V
      E46-6 (B) - Body ground Y - Body ground Turn indicator light signal Ignition switch ON, turn signal LH indicator light OFF Below 1 V
      Ignition switch ON, turn signal LH indicator light ON 11 to 14 V
      E46-7 (TIRE) - Body ground P - Body ground Tire pressure warning light signal Ignition switch ON, tire pressure warning light OFF 3.2 V or more
      Ignition switch ON, tire pressure warning light ON 0.9 to 3.2 V
      E46-9 (TX1+) - Body ground G*1 or LG*2 - Body ground Outside temperature signal Ignition switch ON 5 V or less
      E46-10 (E) - Body ground BR - Body ground Ground (Fuel ground) Always Below 1 V
      E46-11 (EP) - Body ground W-B - Body ground Ground (Illumination ground) Always Below 1 V
      E46-13 (TX-) - Body ground W - Body ground CAN communication signal Ignition switch ON Pulse generation
      E46-14 (TX1-) - Body ground G - Body ground CAN communication signal Ignition switch ON Pulse generation
      E46-16 (FOG)*4 - Body ground P - Body ground Front fog indicator light signal Front fog light switch off, front fog indicator light OFF Below 1 V
      Front fog light switch on, front fog indicator light ON 11 to 14 V
      E46-17 (HEAD)*5 - Body ground GR - Body ground Head indicator light signal Ignition switch ON, head indicator light OFF 11 to 14 V
      Ignition switch ON, head indicator light ON Below 1 V
      E46-20 (EFI) - Body ground P*1 or R*2 - Body ground MIL (Check engine warning light) signal Ignition switch ON, MIL OFF 11 to 14 V
      Ignition switch ON, MIL ON Below 3 V
      E46-23 (TEMP) - Body ground W*1 or GR*2 - Body ground Outside temperature signal Ignition switch ON, outside temperature 25°C (77°F) Approximately 1.3 V
      E46-24 (ILL+) - Body ground V*1 or G*2 - Body ground Tail indicator light signal Headlight dimmer switch off, tail indicator light OFF Below 1 V
      Headlight dimmer switch is at the TAIL position, tail indicator light ON 11 to 14 V
      E46-25 (L) - Body ground Y*1 or P*2 - Body ground Fuel signal Ignition switch ON, fuel level is EMPTY 3 to 7 V
      Ignition switch ON, fuel level is FULL Below 1 V
      E46-26 (ILL-) - Body ground V*1 or W*2 - Body ground Illumination signal Ignition switch ON, headlight dimmer switch OFF Below 1 V
      Ignition switch ON, headlight dimmer switch is at the TAIL or HEAD position Below 1 V ←→ 11 to 14 V
      E46-27 (CANH) - E46-28 (CANL) G - W CAN communication signal Ignition switch ON Pulse generation
      E46-28 (CANL) - E46-27 (CANH) W - G CAN communication signal Ignition switch ON Pulse generation
      E46-29 (ILL-) - Body ground O*1 or W*2 - Body ground Illumination signal Ignition switch ON, headlight dimmer switch OFF Below 1 V
      Ignition switch ON, headlight dimmer switch TAIL or HEAD position Below 1 V ←→ 11 to 14 V
      E46-30 (ET) - Body ground BR - Body ground Ground (Signal ground) Always Below 1 V
      E46-32 (B) - Body ground W*1 or R*2 - Body ground Battery Always 11 to 14 V
      E46-33 (IG+) - Body ground P*1 or B*2 - Body ground Ignition switch signal Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      E46-35 (SI) - Body ground V*1 or LG*2 - Body ground Speed signal for other systems (Input) Ignition switch ON, wheel turned slowly Pulse generation
      (See Fig 2 waveform)
      E46-36 (+S) - Body ground V - Body ground Speed signal for other systems (Output) Wheel turned slowly Pulse generation
      (See Fig 2 waveform)
      E46-38 (S) - Body ground Y*1 or G*2 - Body ground Engine oil pressure warning light signal Ignition switch ON, engine oil pressure warning light OFF 11 to 14 V
      Ignition switch ON, engine oil pressure warning light ON Below 1 V
      E46-39 (CHG-) - Body ground Y - 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
      E46-40 (SW) - Body ground O*1 or BE*2 - Body ground Brake fluid level warning light signal Ignition switch ON, brake warning light OFF 11 to 14 V
      Ignition switch ON, brake warning light ON Below 1 V
      • *1: for TMC Made
      • *2: except TMC Made
      • *3: except for U.S.A.
      • *4: w/ Front Fog Light
      • *5: for U.S.A.
    2. Waveform (Reference): Using oscilloscope:
      Fig 2: Identifying Waveform
      GTY156264Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Item Condition
      Tool setting 5 V/DIV., 20 ms./DIV.
      Vehicle condition Driving at approximately 12 mph (20 km/h)

      HINT: 

      • Vehicle speed signal that has been received and transmitted via the direct line is used for another system, and is not used for combination meter operation.
      • 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.

      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 INNER CIRCUIT 
    1. Combination Meter Inner Circuit
      Fig 3: Combination Meter Inner Circuit Diagram (1 Of 3)
      GTY208637Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 4: Combination Meter Inner Circuit Diagram (2 Of 3)
      GTY208700Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 5: Combination Meter Inner Circuit Diagram (3 Of 3)
      GTY208699Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Terminal No. Wire Harness Side (Symbol)
      E46 1 Front Passenger Seat Belt Warning Light (WRNP)
      2 Washer Level Warning Switch (WLVL)*1
      3 DRL Relay
      4 H-LP RH HI Fuse (+)
      5 Turn Signal Flasher (B)
      6 Turn Signal Flasher (B)
      7 Tire Pressure Warning ECU (TIRE)
      8 -
      9 Outside Temperature Sensor (TX1+)
      10 Fuel Sender Gauge Assembly (E)
      11 Ground (EP)
      12 -
      13 CAN Communication Line (TX-)
      14 CAN Communication Line (TX1-)
      15 -
      16 FR FOG Relay (FOG)*2
      17 DRL Relay (HEAD)
      18 -
      19 -
      20 ECM (EFI)
      21 -
      22 -
      23 Outside Temperature Sensor (TEMP)
      24 TAIL Fuse (ILL+)
      25 Fuel Sender Gauge Assembly (L)
      26 Each part that uses the illumination signal (ILL-)
      27 CAN Communication Line (CANH)
      28 CAN Communication Line (CANL)
      29 Each part that uses the illumination signal (ILL-)
      30 Ground (ET)
      31 -
      32 ECU-B Fuse (B)
      33 METER Fuse (IG+)
      34 -
      35 Skid Control ECU (SI)
      36 Each part that uses the speed signal (+S)
      37 -
      38 Oil Pressure Switch (S)
      39 Alternator L Terminal (CHG-)
      40 Brake Fluid Level Warning Switch (SW)
      • *1: except for U.S.A.
      • *2: w/ Front Fog Light
  3. TELLTALE LIGHT ASSEMBLY (w/ Clock) 
    Fig 6: View Of Telltale Light Assembly Connector
    GTY172628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      E48-1 (B) - Body ground W - Body ground Battery Ignition switch OFF 11 to 14 V
      E48-2 (ACC) - Body ground B - Body ground Ignition switch (ACC) signal Ignition switch OFF Below 1 V
      Ignition switch ON (ACC) 11 to 14 V
      E48-4 (ILL+) - Body ground G - Body ground Illumination signal Ignition switch ON and light control switch off Below 1 V
      Ignition switch ON and light control switch tail or head position 4 to 6 V
      E48-12 (E) - Body ground W-B - Body ground Ground Always Below 1 Ω
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