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Terminals Of Ecu [09/2020 - 11/2021]

  1. COMBINATION METER ASSEMBLY 
    GTY971870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance and check of pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K3-2 (MSM+) - Body ground L - Body ground Steering pad switch assembly signal Engine switch on (IG), enter, top and back switches on steering pad switch not pushed 4.8 to 5.2 V
      K3-3 (MSTI) - Body ground P - Body ground Steering pad switch assembly signal Engine switch on (IG), up, down, right and left switches on steering pad switch not pushed 4.8 to 5.2 V
      K3-4 (ODO) - Body ground L - Body ground ODO/TRIP switch signal Engine switch on (IG), ODO/TRIP switch not pushed 4 to 6 V
      Engine switch on (IG), ODO/TRIP switch pushed Below 1 V
      K3-9 (S) - Body ground* LG - Body ground Engine oil pressure signal Engine started 11 to 14 V
      Engine switch on (IG), engine not started Below 1 V
      K3-12 (RRSB) - Body ground R - Body ground Rear seat belt RH status signal Engine switch on (IG), rear seat belt RH unfastened Below 1 V
      Engine switch on (IG), rear seat belt RH fastened 11 to 14 V
      K3-13 (RCSB) - Body ground W - Body ground Rear seat belt center status signal Engine switch on (IG), rear seat belt center unfastened Below 1 V
      Engine switch on (IG), rear seat belt center fastened 11 to 14 V
      K3-14 (RLSB) - Body ground G - Body ground Rear seat belt LH status signal Engine switch on (IG), rear seat belt LH unfastened Below 1 V
      Engine switch on (IG), rear seat belt LH fastened 11 to 14 V
      K3-15 (OILW) - Body ground GR - Body ground Engine oil level signal Engine switch on (IG), engine oil level not low 11 to 14 V
      Engine switch on (IG), engine oil level low Below 1 V
      K3-16 (WLVL) - Body ground V - Body ground Washer fluid level signal Engine switch on (IG), washer fluid level not low 11 to 14 V
      Engine switch on (IG), washer fluid level low Below 1 V
      K3-17 (SW) - Body ground LG - Body ground Brake fluid level signal Engine switch on (IG), brake fluid level not low 11 to 14 V
      Engine switch on (IG), brake fluid level low Below 1 V
      K3-19 (+S) - Body ground L - Body ground Speed signal for other systems (Output) Engine switch on (IG), wheel being rotated Pulse generation
      (See waveform 1)
      K3-20 (SI) - Body ground V - Body ground Speed signal for other system (Input) Engine switch on (IG), wheel being rotated Pulse generation
      (See waveform 1)
      K3-21 (IG+) - Body ground B - Body ground Engine switch signal Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      K3-22 (B) - Body ground LG - Body ground Battery Always 11 to 14 V
      K3-23 (VCM) - Body ground SB - Body ground Vacuum warning switch signal Engine started, vacuum warning switch off (brake warning light/red (malfunction) off) 11 to 14 V
      Engine started, vacuum warning switch on (brake warning light/red (malfunction) on) Below 1 V
      K3-25 (TR) - Body ground P - Body ground Light control rheostat switch signal Engine switch on (IG), light control rheostat up switch and light control rheostat down switch not pushed 4 to 6 V
      Engine switch on (IG), light control rheostat up switch or light control rheostat down switch pushed Below 1 V
      K3-26 (SW3) - Body ground W - Body ground Ground for trip switch Always Below 1 Ω
      K3-27 (FR) - K3-28 (FE) SB - GR Fuel level signal Engine switch on (IG), fuel receiver gauge indicates F → E (fuel level warning light on) Pulse generation
      (See waveform 2)
      K3-29 (CANH) LG CAN communication line - -
      K3-30 (CANL) B CAN communication line - -
      K3-31 (ES) - Body ground BR - Body ground Ground Always Below 1 Ω
      K3-35 (RLMT) - Body ground L - Body ground Rear left seat belt warning light signal Engine switch on (IG), rear left seat belt warning light off 11 to 14 V
      Engine switch on (IG), rear left seat belt warning light on Below 1 V
      K3-36 (RCMT) - Body ground W - Body ground Rear center seat belt warning light signal Engine switch on (IG), rear center seat belt warning light off 11 to 14 V
      Engine switch on (IG), rear center seat belt warning light on Below 1 V
      K3-37 (RRMT) - Body ground R - Body ground Rear right seat belt warning light signal Engine switch on (IG), rear right seat belt warning light off 11 to 14 V
      Engine switch on (IG), rear right seat belt warning light on Below 1 V
      K3-39 (ILL-) - Body ground BE - Body ground Illumination signal Taillights off Below 1 V
      Taillights on Pulse generation
      K3-40 (EP) - Body ground BR - Body ground Ground Always Below 1 Ω
      K4-1 (B) - Body ground B - Body ground Battery Always 11 to 14 V
      K4-2 (HZSW) - Body ground W - Body ground Hazard warning signal switch signal (Input) Hazard warning signal switch not pressed 11 to 14 V
      Hazard warning signal switch pressed Below 1 V
      K4-3 (ER) - Body ground P - Body ground RH turn signal switch signal Engine switch on (IG), RH turn signal switch off 11 to 14 V
      Engine switch on (IG), RH turn signal switch on Below 1 V
      K4-4 (EL) - Body ground GR - Body ground LH turn signal switch signal Engine switch on (IG), LH turn signal switch off 11 to 14 V
      Engine switch on (IG), LH turn signal switch on Below 1 V
      K4-5 (TRNR) - Body ground R - Body ground Rear turn indicator light RH signal RH turn indicator light off Below 1 V
      RH turn indicator light blinking 11 to 14 V ←→ Below 1 V
      K4-7 (LR) - Body ground R - Body ground Rear turn indicator light RH signal RH turn indicator light off Below 1 V
      RH turn indicator light blinking 11 to 14 V ←→ Below 1 V
      K4-9 (MSCL) B Local bus communication line - -
      K4-10 (MSCH) R Local bus communication line - -
      K4-11 (TRNL) - Body ground LG - Body ground Rear turn signal light LH signal LH turn indicator light off Below 1 V
      LH turn indicator light blinking 11 to 14 V ←→ Below 1 V
      K4-12 (HAZM) - Body ground B - Body ground Hazard warning signal switch signal (Output) Hazard warning signal switch not pressed 11 to 14 V
      Hazard warning signal switch pressed Below 1 V
      K4-13 (LL) - Body ground G - Body ground Rear turn indicator light RH signal LH turn indicator light off Below 1 V
      LH turn indicator light blinking 11 to 14 V ←→ Below 1 V
      1. *: for 2GR-FKS
      1. Waveform 1:
        Fig 1: Waveform 1
        GTY436923Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Item Condition
        Tester connection
        • K3-19 (+S) - Body ground
        • K3-20 (SI) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Engine switch on (IG), wheel being rotated

        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. Waveform 2:
        Fig 2: Waveform 2
        GTY808354Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Item Condition
        Tester connection K3-27 (FR) - K3-28 (FE)
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Engine switch on (IG), fuel receiver gauge indicates F → E (fuel level warning light on)

        HINT: 

        (A) varies depending on the fuel level.

        • fuel receiver gauge indicates F: Below 1 V
        • fuel receiver gauge indicates E (fuel level warning light on): 4.5 to 9.0 V
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