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Terminals Of Ecu

  1. CHECK COMBINATION METER ASSEMBLY 
    Fig 1: Identifying Combination Meter ECU Connector Terminals
    G05541618Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    VOLTAGE AND RESISTANCE SPECIFICATION

    Terminal No. Wiring Color Terminal Description Condition Specified Condition
    C6-1 - Body ground BR - Body ground Ground Always Below 1 Ω
    C6-2 - Body ground SB - Body ground Ground Always Below 1 Ω
    C6-3 - Body ground V - Body ground Battery Always 11 to 14 V
    C6-4 - Body ground LG - Body ground Ignition switch signal Ignition switch ON 11 to 14 V
    Ignition switch OFF Below 1 V
    C6-5 - Body ground L - Body ground Seat belt condition signal Driver seat belt indicator light is OFF 11 to 14 V
    Driver seat belt indicator light blinks Below 1 V
    C6-6 - Body ground R - Body ground Taillight signal Light control switch ON 11 to 14 V
    Light control switch OFF Below 1 V
    C6-7 - Body ground Y - Body ground KEY switch signal No ignition key inserted 11 to 14 V
    Ignition key inserted Below 1 V
    C6-8 - Body ground BR - Body ground Driver door condition signal Driver door open 11 to 14 V
    Driver door closed Below 1 V
    C6-9 - Body ground W - Body ground Oil pressure signal OIL/P warning light OFF 11 to 14 V
    OIL/P warning light ON Below 1 V
    C6-10- Body ground V - Body ground Brake fluid level signal Brake fluid level warning light ON 6.7 to 12 V
    Brake fluid level warning light OFF Below 1 V
    C6-11 - Body ground W - Body ground Illumination signal Ignition switch ON, rheostat is max 11 to 14 V
    Ignition switch OFF Below 1 V
    C6-12- Body ground B - Body ground Brake fluid level signal Brake fluid level warning light OFF 11 to 14 V
    Brake fluid level warning light ON Below 1 V
    C6-13-Body ground W - Body ground ABS signal Ignition switch ON, ABS warning light ON 6.7 to 12 V
    Ignition switch ON, ABS warning light OFF Below 1 V
    C6-14-Body ground L - Body ground Door condition signal Door open 11 to 14 V
    Door closed Below 1 V
    C6-15-Body ground Y - Body ground Charge signal Ignition switch ON 11 to 14 V
    Ignition switch OFF Below 1 V
    C6-16-Body ground B - Body ground Transmission signal P or N indicator light (A/T shift indicator) is ON 7.5 to 11.5 V
    P or N indicator light (A/T shift indicator) is ON Below 1 V
    C6-17-Body ground G - Body ground MIL signal MIL OFF 11 to 14 V
    MIL ON Below 1 V
    C6-18 - Body ground L - Body ground A/T shift condition signal (L) A/T L indicator light ON 11 to 14 V
    A/T L indicator light OFF Below 1 V
    C6-19-Body ground GR - Body ground A/T shift condition signal (2) A/T 2 indicator light ON 11 to 14 V
    A/T 2 indicator light OFF Below 1 V
    C6-20 - Body ground Y - Body ground A/T shift condition signal (3) A/T 3 indicator light ON 11 to 14 V
    A/T 3 indicator light OFF Below 1 V
    C6-21 - Body ground R - Body ground Coolant temperature signal Ignition switch ON, coolant temperature is 90°C (194°F) Pulse generation (See WAVEFORM REFERENCE (WAVEFORM 1) waveform 1)
    C6-22 - Body ground O - Body ground Seat belt condition signal (passenger side) Passenger seat belt indicator light blinks 11 to 14 V
    Passenger seat belt indicator light is OFF Below 1 V
    C6-23 - Body ground G - Body ground Fuel level signal Ignition switch ON, fuel level is EMPTY 4 to 7 V
    Ignition switch ON, fuel level is FULL Below 1 V
    C6-24 - Body ground P - Body ground Passenger seat belt warning signal Passenger seat belt indicator light blinks 11 to 14 V
    Passenger seat belt indicator light is OFF Below 1 V
    C6-25 - Body ground O - Body ground Speed signal (Input) Ignition switch ON and turn wheel slowly Pulse generation (See WAVEFORM REFERENCE (WAVEFORM 2) waveform 2)
    C6-26 - Body ground B - Body ground Tachometer signal Engine idle speed Pulse generation (See WAVEFORM REFERENCE (WAVEFORM 3) waveform 3)
    C6-27 - Body ground L - Body ground Speed signal (Output) Ignition switch ON and turn wheel slowly Pulse generation (See WAVEFORM REFERENCE (WAVEFORM 2) waveform 2)
    C6-29 - Body ground R - Body ground AIR BAG signal SRS warning light ON 8 to 14 V
    SRS warning light OFF Below 1 V
    C6-30 - Body ground GR - Body ground Hi-beam signal Hi-beam ON 11 to 14 V
    Hi-beam OFF Below 1 V
    C6-31 - Body ground R - Body ground Hi-beam signal Hi-beam ON 11 to 14 V
    Hi-beam OFF Below 1 V
    C6-32 - Body ground Y - Body ground Turn signal L Ignition switch ON, turn signal LH indicator light ON 11 to 14 V
    Ignition switch ON, turn signal LH indicator light OFF Below 1 V
    C6-33 - Body ground G - Body ground Turn signal R Ignition switch ON, turn signal RH indicator light ON 11 to 14 V
    Ignition switch ON, turn signal RH indicator light OFF Below 1 V
    C6-34 - Body ground B - Body ground CRUISE signal Ignition switch ON and cruise indicator light ON 11 to 14 V
    Ignition switch ON and cruise indicator light OFF Below 1 V
    C6-36 - Body ground LG - Body ground Tire pressure signal Tire pressure indicator light ON 11 to 14 V
    Tire pressure indicator light OFF Below 1 V
    C6-37 - Body ground B - Body ground A/T shift condition signal (P) A/T P indicator light ON 11 to 14 V
    A/T P indicator light OFF Below 1 V
    C6-38 - Body ground P - Body ground A/T shift condition signal (R) A/T R indicator light ON 11 to 14 V
    A/T R indicator light OFF Below 1 V
    C6-39 - Body ground R - Body ground A/T shift condition signal (N) A/T N indicator light ON 11 to 14 V
    A/T N indicator light OFF Below 1 V
    C6-40 - Body ground LG - Body ground A/T shift condition signal (D) A/T D indicator light ON 11 to 14 V
    A/T D indicator light OFF Below 1 V
    1. Using an oscilloscope, check the signal waveform of the meter.

      Waveform 1 (Reference) 

      WAVEFORM REFERENCE (WAVEFORM 1)

      Item Condition
      Tool setting 5V/DIV., 10 ms./DIV.
      Vehicle condition Ignition switch ON

      Waveform 2 (Reference) 

      WAVEFORM REFERENCE (WAVEFORM 2)

      Item Condition
      Tool setting 5 V/DIV., 20 ms./DIV.
      Vehicle condition Driving at approx. 20 km/h (12.4 mph)

      Waveform 3 (Reference) 

      WAVEFORM REFERENCE (WAVEFORM 3)

      Item Condition
      Tool setting 5V/DIV., 10 ms./DIV.
      Vehicle condition Engine idle speed

      HINT:

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

      Fig 2: Identifying Signal Waveform 1, 2 And 3
      G05541619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Identifying Meter / Gauge System - Diagram (1 Of 3)
      G05541620Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 4: Identifying Meter / Gauge System - Diagram (2 Of 3)
      G05541621Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 5: Identifying Meter / Gauge System - Diagram (3 Of 3)
      G05541622Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Table of Terminal Connection 

      TERMINAL CONNECTION REFERENCE

      Terminal No. Wire harness side
      C6 1 Ground
      2 Fuel Sender Gauge Assembly
      3 ECU-B Fuse
      4 MET IG2 Fuse
      5 Front Seat Inner Belt Assembly (Driver Side)
      6 Light Control Switch, Tail Relay
      7 Unlock Warning Switch Assembly
      8 Door Courtesy Light Switch Assembly
      9 Engine Oil Pressure Switch Assembly
      10 Brake Actuator Assembly
      11 Light Control Rheostat
      12 Brake Fluid Level Warning Switch
      13 Brake Actuator Assembly
      14 Integration Relay
      15 Generator
      16 Brake Actuator Assembly
      17 ECM
      18 PNP Switch
      19 PNP Switch
      20 Shift Lock Control ECU
      21 ECM
      22 Front Seat Inner Belt Assembly (Passenger Side)
      23 Fuel Sender Gauge Assembly
      24 Front Passenger Seat Belt Warning Light
      25 Brake Actuator Assembly
      26 ECM
      27 ECM, Integration Relay
      28 -
      29 Airbag Sensor Assembly Center
      30 Headlight Dimmer Relay
      31 Headlight Dimmer Switch
      32 Turn Signal Flasher
      33 Turn Signal Flasher
      34 ECM
      35 -
      36 Tire Pressure Warning ECU
      37 PNP Switch
      38 PNP Switch
      39 PNP Switch
      40 Shift Lock Control ECU
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