METER / GAUGE SYSTEM TERMINALS OF ECU


  1. CHECK COMBINATION METER ASSEMBLY

    A01J66NE05

    1. Disconnect the C27 and C28 meter connectors.

    2. Measure the voltage and resistance according to the value(s) in the table below.

      Terminal No. Wiring Color Terminal Description Condition Specified Condition
      C27-1 (B) - Body ground R - Body ground Battery Always 11 to 14 V
      C27-9 (TR) - Body ground*1 W-B - Body ground Rheostat signal Rheostat knob fully turned to left 666.9 to 737.1 Ω
      C27-9 (TR) - Body ground*1 W-B - Body ground Rheostat signal Rheostat knob fully turned to right Below 1 Ω
      C27-9 (TR) - Body ground*2, *4 W-B - Body ground Ground Always Below 1 Ω
      C27-9 (TR) - Body ground*2, *5 W-G - Body ground Ground Always Below 1 Ω
      C27-21 (IG+) - Body ground B-O - Body ground IG signal Ignition switch ON 11 to 14 V
      C27-21 (IG+) - Body ground B-O - Body ground IG signal Ignition switch off Below 1 V
      C27-22 (EP) - Body ground Y - Body ground Ground Always Below 1 Ω
      C27-26 (PKBI) - Body ground W-B - Body ground Ground Always Below 1 Ω
      C27-38 (LP) - Body ground*3 R-G - Body ground Ground Always Below 1 Ω

      *1: w/ Light Control Rheostat

      *2: w/o Light Control Rheostat

      *3: w/o ABS

      *4: w/o Short Connector

      *5: w/ Short Connector

    3. Reconnect the C27 and C28 meter connectors.

    4. Measure the voltage according to the value(s) in the table below.

      Terminal No. Wiring Color Terminal Description Condition Specified Condition
      C27-2 (ES) - C27-3 (L) BR - BR-Y Fuel level signal Ignition switch ON, fuel level F Below 1 V
      C27-2 (ES) - C27-3 (L) BR - BR-Y Fuel level signal Ignition switch ON, fuel level E 4 to 7 V
      C27-5 (SI) - Body ground P-L - Body ground Vehicle speed signal (input) Driving at approx. 20 km/h (12 mph) Pulse generation (See waveform 1)
      C27-6 (+S) - Body ground V-R - Body ground Vehicle speed signal (output) Driving at approx. 20 km/h (12 mph) Pulse generation (See waveform 1)
      C27-7 (S) - Body ground B-W - Body ground Tachometer signal Engine idling Pulse generation (See waveform 2)
      C27-8 (ILL+) - Body ground G - Body ground Light control switch signal Light control switch off Below 1 V
      C27-8 (ILL+) - Body ground G - Body ground Light control switch signal Light control switch TAIL or HEAD 11 to 14 V
      C27-10 (KSW) - Body ground G-Y - Body ground Unlock warning switch signal No key in ignition key cylinder Below 1 V
      C27-10 (KSW) - Body ground G-Y - Body ground Unlock warning switch signal Ignition switch off, key in ignition key cylinder 11 to 14 V
      C27-11 (BKL) - Body ground R-Y - Body ground Driver side seat belt warning signal Ignition switch ON, driver side seat belt unfastened Below 1 V
      C27-11 (BKL) - Body ground R-Y - Body ground Driver side seat belt warning signal Ignition switch ON, driver side seat belt fastened 11 to 14 V
      C27-12 (P) - Body ground*1 G-B - Body ground Automatic transmission shift position signal (P) Ignition switch ON, automatic transmission P indicator light off Below 1 V
      C27-12 (P) - Body ground*1 G-B - Body ground Automatic transmission shift position signal (P) Ignition switch ON, automatic transmission P indicator light on 11 to 14 V
      C27-13 (L) - Body ground*1, *2 W-G - Body ground A/T P indicator light signal Ignition switch ON, shift lever in P, A/T P indicator light on Below 1 V
      C27-13 (L) - Body ground*1, *2 W-G - Body ground A/T P indicator light signal Ignition switch ON, shift lever in P, A/T P indicator light off 11 to 14 V
      C27-15 (CTYD) - Body ground R-B - Body ground Driver side door signal (output) Driver side door closed 11 to 14 V
      C27-15 (CTYD) - Body ground R-B - Body ground Driver side door signal (output) Driver side door open Below 1 V
      C27-16 (DCTY) - Body ground R-B - Body ground Driver side door signal (input) Driver side door closed 11 to 14 V
      C27-16 (DCTY) - Body ground R-B - Body ground Driver side door signal (input) Driver side door open Below 1 V
      C27-17 (DOOR) - Body ground R-L - Body ground Door signal Doors closed (Disregarding driver side door) 11 to 14 V
      C27-17 (DOOR) - Body ground R-L - Body ground Door signal Doors open (Disregarding driver side door) Below 1 V
      C27-18 (OILW) - Body ground*1, *2 P - Body ground A/T OIL TEMP warning light signal Ignition switch ON, A/T OIL TEMP warning light on Below 1 V
      C27-18 (OILW) - Body ground*1, *2 P - Body ground A/T OIL TEMP warning light signal Ignition switch ON, A/T OIL TEMP warning light off 11 to 14 V
      C27-20 (SW) - Body ground B-Y - Body ground SRS warning light signal Ignition switch ON, SRS warning light off Pulse generation (See waveform 3)
      C27-20 (SW) - Body ground B-Y - Body ground SRS warning light signal Ignition switch ON, SRS warning light on Pulse generation (See waveform 4)
      C27-24 (B) - Body ground G-B - Body ground Turn signal indicator LH signal Ignition switch ON, turn signal indicator LH light off Below 1 V
      C27-24 (B) - Body ground G-B - Body ground Turn signal indicator LH signal Ignition switch ON, turn signal indicator LH light on 11 to 14 V
      C27-25 (B) - Body ground G-Y - Body ground Turn signal indicator RH signal Ignition switch ON, turn signal indicator RH light off Below 1 V
      C27-25 (B) - Body ground G-Y - Body ground Turn signal indicator RH signal Ignition switch ON, turn signal indicator RH light on 11 to 14 V
      C27-31 (MS5) - Body ground R-B - Body ground IG signal (for speedometer sensor) Ignition switch ON 11 to 14 V
      C27-35 (S) - Body ground LG-B - Body ground OIL PRESSURE warning light signal Ignition switch ON, OIL PRESSURE warning light off 11 to 14 V
      C27-35 (S) - Body ground LG-B - Body ground OIL PRESSURE warning light signal Ignition switch ON, OIL PRESSURE warning light on Below 1 V
      C27-36 (SW) - Body ground LG - Body ground BRAKE warning light signal Ignition switch ON, BRAKE warning light off 11 to 14 V
      C27-36 (SW) - Body ground LG - Body ground BRAKE warning light signal Ignition switch ON, BRAKE warning light on Below 1 V
      C27-37 (CHG-) - Body ground GR - Body ground CHARGE warning light signal Ignition switch ON, CHARGE warning light off 11 to 14 V
      C27-37 (CHG-) - Body ground GR - Body ground CHARGE warning light signal Ignition switch ON, CHARGE warning light on Below 1 V
      C27-38 (LP) - Body ground*3 R-G - Body ground ABS warning light signal Ignition switch ON, ABS warning light off 11 to 14 V
      C27-38 (LP) - Body ground*3 R-G - Body ground ABS warning light signal Ignition switch ON, ABS warning light on Below 1 V
      C27-39 (CHK) - Body ground R-B - Body ground MIL signal Ignition switch ON, MIL off 11 to 14 V
      C27-39 (CHK) - Body ground R-B - Body ground MIL signal

      Ignition switch ON,

      MIL on

      		 Below 1 V
      C28-1 (L) - Body ground*4 GR-L - Body ground Automatic transmission shift position signal (L) Ignition switch ON, automatic transmission L indicator light on 11 to 14 V
      C28-1 (L) - Body ground*4 GR-L - Body ground Automatic transmission shift position signal (L) Ignition switch ON, automatic transmission L indicator light off Below 1 V
      C28-2 (2) - Body ground*4 P-L - Body ground Automatic transmission shift position signal (2) Ignition switch ON, automatic transmission 2 indicator light on 11 to 14 V
      C28-2 (2) - Body ground*4 P-L - Body ground Automatic transmission shift position signal (2) Ignition switch ON, automatic transmission 2 indicator light off Below 1 V
      C28-2 (2) - Body ground*1, *8 G-R - Body ground Automatic transmission shift position signal (L) Ignition switch ON, automatic transmission L indicator light on 11 to 14 V
      C28-2 (2) - Body ground*1, *8 G-R - Body ground Automatic transmission shift position signal (L) Ignition switch ON, automatic transmission L indicator light off Below 1 V
      C28-3 (3) - Body ground*1 L - Body ground Automatic transmission shift position signal (2)*8 or (3)*4 Ignition switch ON, automatic transmission 2*8 or 3*4 indicator light on 11 to 14 V
      C28-3 (3) - Body ground*1 L - Body ground Automatic transmission shift position signal (2)*8 or (3)*4 Ignition switch ON, automatic transmission 2*8 or 3*4 indicator light off Below 1 V
      C28-4 (4) - Body ground*1 G-O - Body ground Automatic transmission shift position signal (3)*8 or (4)*4 Ignition switch ON, automatic transmission 3*8 or 4*4 indicator light on 11 to 14 V
      C28-4 (4) - Body ground*1 G-O - Body ground Automatic transmission shift position signal (3)*8 or (4)*4 Ignition switch ON, automatic transmission 3*8 or 4*4 indicator light off Below 1 V
      C28-5 (D) - Body ground*1 B-R - Body ground Automatic transmission shift position signal (D) Ignition switch ON, automatic transmission D indicator light on 11 to 14 V
      C28-5 (D) - Body ground*1 B-R - Body ground Automatic transmission shift position signal (D) Ignition switch ON, automatic transmission D indicator light off Below 1 V
      C28-6 (N) - Body ground*1 R-W - Body ground Automatic transmission shift position signal (N) Ignition switch ON, automatic transmission N indicator light on 11 to 14 V
      C28-6 (N) - Body ground*1 R-W - Body ground Automatic transmission shift position signal (N)

      Ignition switch ON,

      automatic transmission N indicator light off

      		 Below 1 V
      C28-7 (R) - Body ground*1 R-Y - Body ground Automatic transmission shift position signal (R) Ignition switch ON, automatic transmission R indicator light on 11 to 14 V
      C28-7 (R) - Body ground*1 R-Y - Body ground Automatic transmission shift position signal (R)

      Ignition switch ON,

      automatic transmission R indicator light off

      		 Below 1 V
      C28-8 (A/D) - Body ground*5 L-B - Body ground CRUISE indicator light signal Ignition switch ON, CRUISE indicator light off 11 to 14 V
      C28-8 (A/D) - Body ground*5 L-B - Body ground CRUISE indicator light signal Ignition switch ON, CRUISE indicator light on Below 1 V
      C28-9 (L) - Body ground*6 B - Body ground Rear differential lock indicator light signal Ignition switch ON, rear differential lock indicator light off 11 to 14 V
      C28-9 (L) - Body ground*6 B - Body ground Rear differential lock indicator light signal Ignition switch ON, rear differential lock indicator light on Below 1 V
      C28-11 (-) - Body ground*11 R-Y - Body ground HI BEAM indicator light signal Ignition switch ON, HI BEAM indicator light off Below 1 V
      C28-11 (-) - Body ground*11 R-Y - Body ground HI BEAM indicator light signal Ignition switch ON, HI BEAM indicator light on 11 to 14 V
      C28-11 (-) - Body ground*12 R-Y - Body ground HI BEAM indicator light signal Ignition switch ON, HI BEAM indicator light off 11 to 14 V
      C28-11 (-) - Body ground*12 R-Y - Body ground HI BEAM indicator light signal Ignition switch ON, HI BEAM indicator light on Below 1 V
      C28-15 (FOG) - Body ground*7 G-B - Body ground FR FOG indicator light signal Light control switch TAIL or HEAD, fog light switch off 11 to 14 V
      C28-15 (FOG) - Body ground*7 G-B - Body ground FR FOG indicator light signal Light control switch TAIL or HEAD, fog light switch on Below 1 V
      C28-19 (TAUB) - Body ground B-R - Body ground Signal for amount of fuel consumption Engine idling Pulse generation
      C28-20 (TAU) - Body ground L - Body ground Signal for amount of fuel consumption Engine idling Pulse generation
      C28-22 (LVWG) - Body ground*9 B-L - Body ground Headlight leveling indicator light signal Ignition switch ON, headlight leveling indicator light off 11 to 14 V
      C28-22 (LVWG) - Body ground*9 B-L - Body ground Headlight leveling indicator light signal Ignition switch ON, headlight leveling indicator light on Below 1 V
      C28-25 (SW) - Body ground*10 R-B - Body ground Center differential lock indicator light signal Ignition switch ON, center differential lock indicator light off 11 to 14 V
      C28-25 (SW) - Body ground*10 R-B - Body ground Center differential lock indicator light signal Ignition switch ON, center differential lock indicator light on Below 1 V

      *1: for Automatic Transmission

      *2: for 4WD

      *3: w/ ABS

      *4: for A750F

      *5: w/ Cruise Control System

      *6: w/ Rear Differential Lock

      *7: w/ Front Fog Light

      *8: except A750F

      *9: for HID Headlight

      *10: w/ Center Differential Lock

      *11: w/ Automatic Light Control System

      *12: w/o Automatic Light Control System


      1. A01J3A6E01

        Using an oscilloscope, check waveform 1.

        Waveform 1 (Reference)
        Item Condition
        Tester Connection

        • C27-5 (SI) - Body ground

        • C27-6 (+S) - Body ground
        Tool Setting 5 V/DIV., 20 msec./DIV.
        Condition Driving at approx. 20 km/h (12 mph)

        Tech Tips

        As the vehicle speed increases, the wavelength shortens.

      2. A01J6MVE01

        Using an oscilloscope, check waveform 2.

        Waveform 2 (Reference)
        Item Condition
        Tester Connection C27-7 (S) - Body ground
        Tool Setting 5 V/DIV., 10 msec./DIV.
        Condition Engine idling

        Tech Tips

        As the engine speed increases, the wavelength shortens.

      3. A01J6W2E01

        Using an oscilloscope, check waveform 3.

        Waveform 3 (Reference)
        Item Condition
        Tester Connection C27-20 (SW) - Body ground
        Tool Setting 5 V/DIV., 50 msec./DIV.
        Condition Ignition switch ON, SRS warning light off
      4. A01J42YE01

        Using an oscilloscope, check waveform 4.

        Waveform 4 (Reference)
        Item Condition
        Tester Connection C27-20 (SW) - Body ground
        Tool Setting 5 V/DIV., 50 msec./DIV.
        Condition Ignition switch ON, SRS warning light on

  2. CHECK ACCESSORY METER (w/ Accessory Meter Assembly)

    A01J47QE05

    1. Disconnect the A43 accessory meter connector.

    2. Measure the voltage and resistance according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A43-1 (GND1) - Body ground LG - Body ground Ground Always Below 1 Ω
      A43-10 (SGND) - Body ground BR - Body ground Ground Always Below 1 Ω
      A43-12 (IG) - Body ground R-L - Body ground IG signal Ignition switch ON 11 to 14 V
      A43-12 (IG) - Body ground R-L - Body ground IG signal Ignition switch off Below 1 V
      A43-13 (ACC) - Body ground G-R - Body ground ACC signal Ignition switch ACC or ON 11 to 14 V
      A43-13 (ACC) - Body ground G-R - Body ground ACC signal Ignition switch off Below 1 V
      A43-14 (+B) - Body ground R - Body ground Battery Always 11 to 14 V

    3. Reconnect the A43 accessory meter connector.

    4. Measure the voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A43-2 (SG) - A43-3 (TH+) BR-Y - W-G Ambient temperature signal Ignition switch ON, ambient temperature 25°C (77°F) 1.32 V
      A43-2 (SG) - A43-3 (TH+) BR-Y - W-G Ambient temperature signal Ignition switch ON, ambient temperature 40°C (104°F) 0.8 V
      A43-8 (PBEW) - Body ground G-W - Body ground Front passenger side seat belt warning light signal Ignition switch ON, front passenger side seat belt warning light on Below 1 V
      A43-8 (PBEW) - Body ground G-W - Body ground Front passenger side seat belt warning light signal Ignition switch ON, front passenger side seat belt warning light off 11 to 14 V
      A43-11 (SW+) - Body ground* B - Body ground Steering pad switch signal Ignition switch ON, steering pad switch not pressed 4 V or more
      A43-11 (SW+) - Body ground* B - Body ground Steering pad switch signal Ignition switch ON, INFO switch pressed Below 1 V
      A43-11 (SW+) - Body ground* B - Body ground Steering pad switch signal Ignition switch ON, MODE RESET switch pressed 2 to 3 V

      *: w/ Steering Pad Switch

  3. COMBINATION METER INNER CIRCUIT

    A01J3UFE06
    A01J7NFE03
    A01J5B2E01
    A01J56GE01
    A01J5FVE01
    A01J4NWE01

  4. TABLE OF TERMINAL CONNECTION

    Terminal No. Wire Harness Side
    C27 1 DOME fuse
    2 Fuel sender gauge
    3 Fuel sender gauge
    4 ECM
    5 Speedometer sensor
    6 4-pulse output
    7 ECM
    8

    • Taillight relay*5

    • Headlight dimmer switch*6
    9

    • Light control rheostat*1

    • Body ground*4
    10 Unlock warning switch assembly
    11 Front seat inner belt assembly LH
    12 Park/neutral position switch*2
    13 No. 2 transfer indicator switch (Transfer neutral position switch)*2, *3
    14 -
    15 Integration relay
    16 Front door courtesy light switch assembly LH
    17

    • Front door courtesy light switch RH

    • Rear door courtesy light switch RH

    • Rear door courtesy light switch assembly LH

    • Back door courtesy light switch (Back door lock assembly)
    18 ECM*2, *3
    19 -
    20 Center airbag sensor assembly
    21 MET fuse
    22 Body ground
    23 -
    24 Turn signal flasher relay
    25 Turn signal flasher relay
    26 Body ground
    27 -
    28 -
    29 -
    30 -
    31 Speedometer sensor
    32 -
    33 -
    34 -
    35 Engine oil pressure switch assembly
    36

    • Parking brake switch

    • Brake fluid level switch

    • Brake actuator assembly*9

    • Radio and display receiver assembly*14
    37 Generator
    38

    • Brake actuator assembly*9

    • Body ground*15
    39 ECM
    40 -
    C28 1 Park/neutral position switch*16
    2 Park/neutral position switch*2
    3 Park/neutral position switch*2
    4 Shift lock control ECU*2
    5 Shift lock control ECU*2
    6 Park/neutral position switch*2
    7 Park/neutral position switch*2
    8 ECM*7
    9 No. 1 transfer indicator switch (Rear differential lock position switch)*11
    10 -
    11

    • H-LP LH fuse*5

    • Headlight dimmer switch*6
    12 -
    13 -
    14 -
    15 Headlight dimmer switch*8
    16 -
    17 -
    18 -
    19 INJ fuse
    20 No. 1 fuel injector assembly
    21 -
    22 Headlight leveling ECU assembly*12
    23 Accessory meter assembly*10
    24 Accessory meter assembly*10
    25 No. 3 transfer indicator switch (Center differential lock position switch)*13
    26 -
    27 -
    28 -

    *1: w/ Light Control Rheostat

    *2: for Automatic Transmission

    *3: for 4WD

    *4: w/o Light Control Rheostat

    *5: w/ Automatic Light Control System

    *6: w/o Automatic Light Control System

    *7: w/ Cruise Control System

    *8: w/ Front Fog Light

    *9: w/ ABS

    *10: w/ Accessory Meter Assembly

    *11: w/ Rear Differential Lock

    *12: for HID Headlight

    *13: w/ Center Differential Lock

    *14: for Radio and Display Type

    *15: w/o ABS

    *16: for A750F