SFI SYSTEM TERMINALS OF ECM


  1. SFI SYSTEM

    A019N62E08

    Tech Tips

    The standard normal voltage between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals are also indicated.

    The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the Specified Condition column.

    The illustration above can be used as a reference to identify the ECM terminal locations.

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    A43-3 (+B) - D1-81 (E1) BR - BR Power source of ECM Engine switch on (IG) 11 to 14 V
    A43-2 (+B2) - D1-81 (E1) L - BR Power source of ECM Engine switch on (IG) 11 to 14 V
    A43-1 (BATT) - D1-81 (E1) LG - BR Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
    D1-41 (+BM) - D1-81 (E1) L - BR Power source of electronic throttle control system throttle motor Always 11 to 14 V
    A43-34 (MREL) - D1-81 (E1) Y - BR EFI MAIN relay operation signal Engine switch on (IG) 11 to 14 V
    D1-80 (VCTA) - D1-79 (ETA) Y - B Power source for throttle position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
    D1-67 (VCV1) - D1-81 (E1) W - BR Power source for camshaft position (VVT) sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
    D1-66 (VCV2) - D1-81 (E1) Y - BR Power source for camshaft position (VVT) sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
    A43-28 (IGSW) - D1-81 (E1) G - BR Engine switch signal Engine switch on (IG) 11 to 14 V
    A43-52 (FC) - D1-81 (E1) BE - BR C/OPN relay operation signal (fuel pump control) Engine switch on (IG) 11 to 14 V
    Idling with warm engine 0 to 1.5 V
    A43-36 (STP) - D1-81 (E1) B - BR Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
    Brake pedal released 0 to 1.5 V
    A43-35 (ST1-) - D1-81 (E1) BR - BR Stop light switch assembly signal (opposite to STP terminal) Engine switch on (IG), brake pedal depressed 0 to 1.5 V
    Engine switch on (IG), brake pedal released 7.5 to 14 V
    A43-55 (VPA) - A43-58 (EPA) BE - P Accelerator pedal position sensor signal (for engine control) Engine switch on (IG), accelerator pedal fully released 0.5 to 1.1 V
    Engine switch on (IG), accelerator pedal fully depressed 2.6 to 4.5 V
    A43-56 (VPA2) - A43-60 (EPA2) GR - V Accelerator pedal position sensor signal (for sensor malfunction detection) Engine switch on (IG), accelerator pedal fully released 1.2 to 2.0 V
    Engine switch on (IG), accelerator pedal fully depressed 3.4 to 4.75 V
    A43-16 (TC) - D1-81 (E1) L - BR Terminal TC of DLC3 Engine switch on (IG) 11 to 14 V
    A43-57 (VCPA) - A43-58 (EPA) B - P Power source of accelerator pedal position sensor (for VPA) Engine switch on (IG) 4.5 to 5.5 V
    A43-59 (VCP2) - A43-60 (EPA2) LG - V Power source of accelerator pedal position sensor (for VPA2) Engine switch on (IG) 4.5 to 5.5 V
    A43-15 (TACH) - D1-81 (E1) W - BR Engine speed signal (for combination meter assembly) Idling with warm engine

    Pulse generation

    (see waveform 12)
    A43-13 (SPD) - D1-81 (E1) SB - BR Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph)

    Pulse generation

    (see waveform 9)
    A43-24 (W) - D1-81 (E1) G - BR Malfunction Indicator Lamp (MIL) operation signal Engine switch on (IG) Below 3.0 V
    Idling 11 to 14 V
    A43-10 (CANH) - D1-81 (E1) G - BR CAN communication line Engine stopped and engine switch on (IG)

    Pulse generation

    (see waveform 13)
    A43-11 (CANL) - D1-81 (E1) L - BR CAN communication line Engine stopped and engine switch on (IG)

    Pulse generation

    (see waveform 14)
    D1-81 (E1) - Body ground BR - Body ground Earth (ground) circuit of ECM Always Below 1 Ω

    D1-86 (#10) - D1-43 (E01)

    D1-109 (#20) - D1-43 (E01)

    D1-85 (#30) - D1-43 (E01)

    D1-108 (#40) - D1-43 (E01)

    D1-84 (#50) - D1-43 (E01)

    D1-107 (#60) - D1-43 (E01)

    L - W-B

    Y - W-B

    B - W-B

    W - W-B

    W-B - W-B

    G - W-B

    		 Fuel injector assembly operation signal Engine switch on (IG) 11 to 14 V
    Idling with warm engine

    Pulse generation

    (see waveform 3)
    A43-46 (STA) - D1-81 (E1) BE - BR Starter relay operation signal Cranking 11 to 14 V
    D1-52 (OC2+) - D1-51 (OC2-) P - L Camshaft timing oil control valve assembly operation signal (intake side) Idling

    Pulse generation

    (see waveform 1)
    D1-58 (OC1+) - D1-57 (OC1-) W - G-R Camshaft timing oil control valve assembly operation signal (intake side) Idling

    Pulse generation

    (see waveform 1)
    D1-87 (VV2+) - D1-88 (VV2-) P - B Camshaft position (VVT) sensor signal (intake side) Idling with warm engine

    Pulse generation

    (see waveform 6)
    D1-90 (VV1+) - D1-89 (VV1-) G - R Camshaft position (VVT) sensor signal (intake side) Idling with warm engine

    Pulse generation

    (see waveform 6)
    D1-110 (NE+) - D1-111 (NE-) R - G Crankshaft position sensor signal Idling with warm engine

    Pulse generation

    (see waveform 6)
    A43-7 (NEO) - D1-81 (E1) BR - BR Crankshaft position sensor signal Idling with warm engine Pulse generation (see waveform 16)
    D1-64 (EV2+) - D1-89 (VV1-) W-L - R Camshaft position (VVT) sensor signal (exhaust side) Idling with warm engine

    Pulse generation

    (see waveform 5)
    D1-69 (EV1+) - D1-89 (VV1-) B - R Camshaft position (VVT) sensor signal (exhaust side) Idling with warm engine

    Pulse generation

    (see waveform 5)
    D1-56 (OE1+) - D1-55 (OE1-) G - R Camshaft timing oil control valve assembly operation signal (exhaust side) Idling

    Pulse generation

    (see waveform 1)
    D1-50 (OE2+) - D1-49 (OE2-) G-R - W Camshaft timing oil control valve assembly operation signal (exhaust side) Idling

    Pulse generation

    (see waveform 1)
    D1-18 (M-) - D1-82 (ME01) W - W-B Throttle actuator operation signal (negative terminal) Idling with warm engine

    Pulse generation

    (see waveform 11)
    D1-19 (M+) - D1-82 (ME01) B - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

    Pulse generation

    (see waveform 10)
    D1-42 (E02) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω

    D1-40 (IGT1) - D1-81 (E1)

    D1-39 (IGT2) - D1-81 (E1)

    D1-38 (IGT3) - D1-81 (E1)

    D1-37 (IGT4) - D1-81 (E1)

    D1-36 (IGT5) - D1-81 (E1)

    D1-35 (IGT6) - D1-81 (E1)

    L - BR

    P - BR

    R-B - BR

    L - BR

    Y - BR

    W-L - BR

    		 Ignition coil assembly (ignition signal) Idling with warm engine

    Pulse generation

    (see waveform 7)
    D1-17 (GE01) - D1-81 (E1) BR - BR Shield earth (ground) circuit of throttle actuator Always Below 1 V

    D1-114 (OX1B) - D1-115 (EX1B)

    D1-112 (OX2B) - D1-113 (EX2B)

    W - R-B

    B - BR

    		 Heated oxygen sensor signal Engine speed is maintained at 2500 rpm for 2 minutes after warming up engine

    Pulse generation

    (see waveform 2)
    D1-77 (VTA2) - D1-79 (ETA) P - B Throttle position sensor signal (for sensor malfunction detection) Engine switch on (IG), accelerator pedal fully released 2.1 to 3.1 V
    Engine switch on (IG), accelerator pedal fully depressed 4.6 to 5.0 V
    D1-78 (VTA1) - D1-79 (ETA) W - B Throttle position sensor signal (for engine control) Engine switch on (IG), accelerator pedal fully released 0.5 to 1.1 V
    Engine switch on (IG), accelerator pedal fully depressed 3.2 to 4.8 V
    D1-76 (THW) - D1-97 (ETHW) G - BR Engine coolant temperature sensor signal Idling, engine coolant temperature 60 to 120°C (140 to 248°F) 0.2 to 1.0 V
    D1-73 (THA) - D1-98 (ETHA) L - W-B Intake air temperature sensor signal Idling, intake air temperature 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
    D1-104 (IGF1) - D1-81 (E1) LG - BR Ignition coil assembly (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.0 V
    Idling with warm engine

    Pulse generation

    (see waveform 7)
    D1-61 (AICV) - D1-81 (E1) R - BR Vacuum switching valve for air intake control system operation signal Engine switch on (IG) 11 to 14 V
    D1-74 (VG) - D1-75 (E2G) R - LG Mass air flow meter sub-assembly signal Idling, shift lever in P or N, A/C switch off 0 to 3.0 V
    D1-62 (ACIS) - D1-81 (E1) Y - BR Intake air control valve assembly for ACIS (Acoustic Control Induction System) operation signal Engine switch on (IG) 11 to 14 V
    D1-63 (PRG) - D1-81 (E1) W-L - BR Purge VSV for EVAP system operation signal Engine switch on (IG) 11 to 14 V
    Idling with warm engine

    Pulse generation

    (see waveform 8)
    D1-20 (HA2A) - D1-21 (E05) R - BR Air fuel ratio sensor heater (bank 2 sensor 1) operation signal Idling Pulse generation (see waveform 15)
    D1-22 (HA1A) - D1-23 (E04) B-W - W-B Air fuel ratio sensor heater (bank 1 sensor 1) operation signal Idling Pulse generation (see waveform 15)
    D1-44 (HT2B) - D1-46 (E03) W-L - W-B Heated oxygen sensor heater (bank 2 sensor 2) operation signal Idling Pulse generation (see waveform 15)
    D1-45 (HT1B) - D1-46 (E03) R - W-B Heated oxygen sensor heater (bank 1 sensor 2) operation signal Idling Pulse generation (see waveform 15)
    D1-83 (ACM) - D1-81 (E1) P - BR Duty vacuum switching valve for active control mount system operation signal Engine switch on (IG) 11 to 14 V
    D1-120 (NSW) - D1-81 (E1) G-R - BR Park/Neutral position switch assembly signal Engine switch on (IG), shift lever in P or N Below 3.0 V
    Engine switch on (IG), shift lever in any position other than P or N 11 to 14 V
    D1-117 (KNK2) - D1-116 (EKN2) R - G Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

    Pulse generation

    (see waveform 4)
    D1-94 (KNK1) - D1-93 (EKNK) B - W Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

    Pulse generation

    (see waveform 4)
    D1-126 (A1A+) - D1-81 (E1) BR - BR Air fuel ratio sensor Engine switch on (IG) 3.3 V*
    D1-125 (A1A-) - D1-81 (E1) Y - BR Air fuel ratio sensor Engine switch on (IG) 3.0 V*
    D1-103 (A2A+) - D1-81 (E1) P - BR Air fuel ratio sensor Engine switch on (IG) 3.3 V*
    D1-102 (A2A-) - D1-81 (E1) L - BR Air fuel ratio sensor Engine switch on (IG) 3.0 V*
    D1-2 (P) - D1-81 (E1) B-W - BR P shift position switch signal Engine switch on (IG) and shift lever in P 11 to 14 V
    Engine switch on (IG) and shift lever in any position other than P 0 to 1.5 V
    D1-26 (R) - D1-81 (E1) R-B - BR R shift position switch signal Engine switch on (IG) and shift lever in R 11 to 14 V
    Engine switch on (IG) and shift lever in any position other than R 0 to 1.5 V
    D1-25 (N) - D1-81 (E1) LG - BR N shift position switch signal Engine switch on (IG) and shift lever in N 11 to 14 V
    Engine switch on (IG) and shift lever in any position other than N 0 to 1.5 V
    D1-27 (D) - D1-81 (E1) Y - BR D shift position switch signal Engine switch on (IG) and shift lever in D 11 to 14 V
    Engine switch on (IG) and shift lever in any position other than D 0 to 1.5 V
    A43-25 (S) - D1-81 (E1) L - BR S shift position switch signal Engine switch on (IG) and shift lever in S 11 to 14 V
    Engine switch on (IG) and shift lever in any position other than S 0 to 1.5 V
    A43-27 (SFTD) - D1-81 (E1) BE - BR Down shift switch signal Engine switch on (IG) and shift lever in S 11 to 14 V
    Engine switch on (IG) and shift lever in S, the "-" range (down shift) selected 0 to 1.5 V
    A43-38 (SFTU) - D1-81 (E1) W - BR Up shift switch signal Engine switch on (IG) and shift lever in S 11 to 14 V
    Engine switch on (IG) and shift lever in S, the "+" range (up shift) selected 0 to 1.5 V
    A43-48 (FPR) - D1-81 (E1) R - BR Fuel pump control Cranking 11 to 14 V
    Idling with warm engine 0 to 1.5 V
    D1-24 (CAN+) - D1-81 (E1) L - BR CAN communication line Engine stopped and engine switch on (IG)

    Pulse generation

    (see waveform 13)
    D1-1 (CAN-) - D1-81 (E1) R - BR CAN communication line Engine stopped and engine switch on (IG)

    Pulse generation

    (see waveform 14)
    A43-8 (CANP) - D1-81 (E1) B - BR CAN communication line Engine stopped and engine switch on (IG) Pulse generation (see waveform 13)
    A43-9 (CANN) - D1-81 (E1) W - BR CAN communication line Engine stopped and engine switch on (IG) Pulse generation (see waveform 14)
    D1-32 (ALT) - D1-81 (E1) L - BR Generator assembly Engine switch on (IG) 11 to 14 V

    *: The ECM terminal voltage is constant regardless of the output voltage from the sensor.


    1. A019JZSE01

      WAVEFORM 1


      1. Camshaft timing oil control valve assembly operation signal

        ECM Terminal Name Between OC1+ and OC1-, OC2+ and OC2-, OE1+ and OE1-, or OE2+ and OE2-
        Tester Range 5 V/DIV, 1 ms./DIV.
        Condition Idling
    2. A019K1VE15

      WAVEFORM 2


      1. Heated oxygen sensor signal

        ECM Terminal Name Between OX1B and EX1B, or OX2B and EX2B
        Tester Range 0.2 V/DIV., 200 ms./DIV.
        Condition Engine speed is maintained at 2500 rpm for 2 minutes after warming up engine

        Tech Tips

        In the Data List, item O2S B1S2 and O2S B2S2 shows the ECM values from the heated oxygen sensor.

    3. A019N1PE22

      WAVEFORM 3


      1. Fuel injector assembly operation signal

        ECM Terminal Name Between #10 (to #60) and E01
        Tester Range 20 V/DIV., 20 ms./DIV.
        Condition Idling with warm engine

        Tech Tips

        The wavelength becomes shorter as the engine speed increases.

    4. A019JRXE01

      WAVEFORM 4


      1. Knock control sensor signal

        ECM Terminal Name Between KNK1 and EKNK, or KNK2 and EKN2
        Tester Range 1 V/DIV., 1 ms./DIV.
        Condition Engine speed maintained at 4000 rpm after warming up engine

        Tech Tips


        • The wavelength becomes shorter as the engine speed increases.

        • The waveforms and amplitudes displayed differ slightly depending on the vehicle.

    5. A019LHWE02

      WAVEFORM 5


      1. Variable Valve Timing (VVT) sensor for exhaust side signal

        ECM Terminal Names Between EV1+ and VV1-, or EV2+ and VV1-
        Tester Range 5 V/DIV., 20 ms./DIV.
        Conditions Idling with warm engine

        Tech Tips

        The wavelength becomes shorter as the engine speed increases.

    6. A019KO8E01

      WAVEFORM 6


      1. Variable Valve Timing (VVT) sensor for intake side signal (A)

      2. Crankshaft position sensor signal (B)

        ECM Terminal Name

        (A) Between VV1+ and VV1-, VV2+ and VV2-

        (B) Between NE+ and NE-
        Tester Range 5 V/DIV., 20 ms./DIV.
        Condition Idling with warm engine

        Tech Tips

        The wavelength becomes shorter as the engine speed increases.

    7. A019PD4E01

      WAVEFORM 7


      1. Igniter IGT signal (from ECM to igniter) and igniter IGF signal (from igniter to ECM)

        ECM Terminal Name

        (1) Between IGT (1 to 6) and E1

        (2) Between IGF1 and E1
        Tester Range 2 V/DIV., 20 ms./DIV.
        Condition Idling with warm engine

        Tech Tips

        The wavelength becomes shorter as the engine speed increases.

    8. A019M6WE01

      WAVEFORM 8


      1. Purge VSV for EVAP system operation signal

        ECM Terminal Name Between PRG and E1
        Tester Range 10 V/DIV., 20 ms./DIV.
        Condition Idling with warm engine

        Tech Tips

        If the waveform is not similar to that shown in the illustration, check the waveform again after idling for 10 minutes or more.

    9. A019NOIE01

      WAVEFORM 9


      1. Vehicle speed signal

        ECM Terminal Name Between SPD and E1
        Tester Range 2 V/DIV., 20 ms./DIV.
        Condition Driving at 20 km/h (12 mph)

        Tech Tips


        • The wavelength becomes shorter as the vehicle speed increases.

        • Depending on the vehicle, the output waveform voltage may rise to 12 V if influenced by optionally installed systems.

    10. A019M8QE03

      WAVEFORM 10


      1. Throttle actuator operation signal (positive terminal)

        ECM Terminal Name Between M+ and ME01
        Tester Range 5 V/DIV., 1 ms./DIV.
        Condition Idling with warm engine

        Tech Tips

        The duty ratio varies depending on the throttle actuator operation.

    11. A019PDTE03

      WAVEFORM 11


      1. Throttle actuator operation signal (negative terminal)

        ECM Terminal Name Between M- and ME01
        Tester Range 5 V/DIV., 1 ms./DIV.
        Condition Idling with warm engine

        Tech Tips

        The duty ratio varies depending on the throttle actuator operation.

    12. A019LH0E01

      WAVEFORM 12


      1. Engine speed signal

        ECM Terminal Name Between TACH and E1
        Tester Range 5 V/DIV., 10 ms./DIV.
        Condition Idling with warm engine

        Tech Tips

        The wavelength becomes shorter as the engine speed increases.

    13. A019MLQE02

      WAVEFORM 13


      1. CAN communication signal

        ECM Terminal Name Between CANH and E1, CAN+ and E1 or CANP and E1
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Engine stopped and engine switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.

    14. A019MXPE02

      WAVEFORM 14


      1. CAN communication signal

        ECM Terminal Name Between CANL and E1, CAN- and E1 or CANN and E1
        Tester Range 1 V/DIV., 10 μsec./DIV.
        Condition Engine stopped and engine switch on (IG)

        Tech Tips

        The waveform varies depending on the CAN communication signal.

    15. A019K5FE01

      WAVEFORM 15


      1. Air fuel ratio sensor and heated oxygen sensor heater operation signal

        ECM Terminal Name Between HA1A and E04, HA2A and E05, HT1B and E03 or HT2B and E03
        Tester Range 5 V/DIV., 10 ms./DIV.
        Condition Idling

        Tech Tips

        The wavelength becomes shorter as the engine speed increases.

    16. A019JYKE01

      WAVEFORM 16


      1. Crankshaft position sensor signal

        ECM Terminal Name Between NEO and E1
        Tester Range 2 V/DIV., 2 ms./DIV.
        Condition Idling with warm engine

        Tech Tips

        The wavelength becomes shorter as the engine speed increases.