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Terminals Of Ecu [11/2022 - ]

  1. COMBINATION METER ASSEMBLY 
    GTY928661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage and resistance and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      I4-1 (EP) - Body ground Ground Always Below 1 Ω
      I4-2 (ES) - Body ground Ground Always Below 1 Ω
      I4-5 (B) - Body ground Power source for auxiliary battery
      • Ignition switch off*1
      • Always*2
      		 11 to 14 V
      I4-6 (IG+) - Body ground Power source for IG relay IG OFF → IG ON
      • Below 1 V → 11 to 14 V*1
      • Below 1 V → 10.5 to 16 V*2
      I4-8 (+S) - Body ground Vehicle speed output signal Ignition switch ON, wheel being rotated Pulse generation
      (See waveform 1)
      I4-9 (S) - Body ground*1 Engine oil pressure signal Engine started → not started 11 to 14 V → Below 1 V
      I4-11 (SW) - Body ground*2 Brake fluid level warning switch signal Ignition switch ON, brake fluid level not low (brake warning light/red (malfunction) off) → low (brake warning light/red (malfunction) on) 11 to 14 V → Below 1 V
      I4-12 (HZSW) - Body ground Hazard warning signal switch signal Hazard warning signal switch off → on 11 to 14 V → Below 1 V
      I4-13 (WLVL) - Body ground*3 Washer fluid level signal Ignition switch ON, washer fluid level not low → low 11 to 14 V → Below 1 V
      I4-14 (OILW) - Body ground Engine oil level sensor signal Ignition switch ON, engine oil level not low → low Below 1 V → 11 to 14 V
      I4-23 (ILL-) - Body ground Illumination signal Taillights off → on Below 1 V → Pulse generation
      I4-25 (SI) - Body ground Vehicle speed input signal Ignition switch ON, wheel being rotated Pulse generation
      (See waveform 1)
      I4-27 (VCM) - Body ground*2 Vacuum warning switch signal Engine started, vacuum warning switch off (brake warning light/red (malfunction) off) → on (brake warning light/red (malfunction) on) 11 to 14 V → Below 1 V
      I4-28 (LST1) - Body ground*1 Fuel lid status signal Ignition switch OFF 11 to 14 V
      The following message (interrupt display) being displayed on the multi-information display:
      1. "Ready to Refuel"
      		 Pulse generation
      (See waveform 4)
      The following message (interrupt display) being displayed on the multi-information display:
      1. "Close Fuel Lid"
      		 Pulse generation
      (See waveform 5)
      I5-2 (B) - Body ground Power source for auxiliary battery
      • Ignition switch off*1
      • Always*2
      		 11 to 14 V
      I5-5 (LL) - Body ground Front/side turn signal flasher signal
      (LH side)      		 Turn indicator light (LH) blinking 11 to 14 V ←→ Below 1 V
      Turn indicator light (LH) off Below 1 V
      I5-6 (LR) - Body ground Front/side turn signal flasher signal
      (RH side)      		 Turn indicator light (RH) blinking 11 to 14 V ←→ Below 1 V
      Turn indicator light (RH) off Below 1 V
      I5-7 (FR) - I5-25 (FE&B) Fuel level signal Ignition switch ON, fuel receiver gauge indicates F → E (fuel level warning light on) Pulse generation
      (See waveform 2)
      I5-10 (TC) - Body ground Tail cancel switch signal Ignition switch ON, light control rheostat knob not fully turned upward (Tail cancel switch off) → fully turned upward (Tail cancel switch on) Below 1 V → 4 to 6 V
      I5-11 (SW1) - Body ground Light control rheostat (Power source) Ignition switch ON 4 to 6 V
      I5-12 (MSTI) - Body ground Steering pad switch without touch detection function signal Ignition switch ON, up, down, left and right switches on steering pad switch not pushed 4.8 to 5.2 V
      I5-14 (CANL) CAN communication signal - -
      I5-15 (TX-) Local bus communication signal - -
      I5-21 (TRNR) - Body ground Rear turn signal flasher signal
      (RH side)      		 Turn indicator light (RH) blinking 11 to 14 V ←→ Below 1 V
      Turn indicator light (RH) off Below 1 V
      I5-22 (TRNL) - Body ground Rear turn signal flasher signal
      (LH side)      		 Turn indicator light (LH) blinking 11 to 14 V ←→ Below 1 V
      Turn indicator light (LH) off Below 1 V
      I5-23 (FV) - Body ground Power source for fuel sender gauge Ignition switch ON Pulse generation
      (See waveform 3)
      I5-25 (FE&B) - Body ground Ground for fuel sender gauge Always Below 1 Ω
      I5-26 (SW3) - Body ground Ground for trip switch Always Below 1 Ω
      I5-28 (SW2) - Body ground Light control rheostat signal Ignition switch ON, light control rheostat knob fully turned downward → fully turned upward Below 1 V → 4 to 6 V
      (Gradually change)
      I5-29 (MSM+) - Body ground Steering pad switch without touch detection function signal Ignition switch ON, OK and back switches on steering pad switch not pushed 4.8 to 5.2 V
      I5-31 (CANH) CAN communication signal - -
      I5-32 (TX+) Local bus communication signal - -
      1. *1: for HV Model
      2. *2: for Gasoline Model
      3. *3: w/ Washer Fluid Level Warning
      1. WAVEFORM 1
        WAVEFORM 1:

        Item Condition
        Tester connection
        • I4-8 (+S) - Body ground
        • I4-25 (SI) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Ignition switch ON, wheel being rotated
        GTY986807Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        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
        WAVEFORM 2:

        Item Condition
        Tester connection
        • I5-7 (FR) - I5-25 (FE&B)
        Tool setting 2.5 V/DIV., 20 ms./DIV.
        Condition Ignition switch ON, fuel receiver gauge indicates F → E (fuel level warning light on)
        GTY776691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT: 

        (A) varies depending on the fuel level.

        • Fuel level full: 4.0 to 4.6 V
        • Fuel level low (fuel level warning light on): 0.3 to 0.9 V
      3. WAVEFORM 3
        GTY801514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM 3:

        Item Condition
        Tester connection
        • I5-23 (FV) - Body ground
        Tool setting 2.5 V/DIV., 20 ms./DIV.
        Condition Ignition switch ON
        Specified Condition 4.5 to 5.5 V
      4. WAVEFORM 4
        GTY704448Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        WAVEFORM 4:

        Item Condition
        Tester connection I4-28 (LST1) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition The following message (interrupt display) being displayed on the multi-information display:
        1. "Ready to Refuel"
      5. WAVEFORM 5
        WAVEFORM 5:

        Item Condition
        Tester connection I4-28 (LST1) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition The following message (interrupt display) being displayed on the multi-information display:
        1. "Close Fuel Lid"
        GTY734467Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT: 

        This waveform is output when the fuel lid opener switch is operated if the fuel lid is open and any of the following conditions are met:

        • The vehicle has been driven for 1 km (0.6 mile) or more at a speed of 50 km/h (31 mph) or more.
        • 30 minutes or more have elapsed since the fuel lid opener switch was operated.
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