SFI SYSTEM TERMINALS OF ECM


  1. EFI ECU

    B00483BE01

    Tech Tips

    The standard voltage, resistance and waveform between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals is also indicated. The result of checks should be compared with the standard voltage, resistance and waveform for each pair of the terminals as 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
    A116-1 (VPA2) - A116-46 (EPA2) L - B Accelerator pedal position sensor signal 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
    A116-2 (VPA) - A116-10 (EPA) R - Y 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
    A116-9 (CANP) - A116-35 (E1) W - W-B CAN communication line Engine switch on (IG)

    Pulse generation

    (See waveform 1)
    A116-11 (E01) - Body ground BR - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
    A116-12 (+B3) - A116-35 (E1) B - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
    A116-18 (VCPA) - A116-10 (EPA) G - Y Power source of accelerator pedal position sensor (for VPA) Engine switch on (IG) 4.5 to 5.5 V
    A116-21 (CANN) - A116-35 (E1) L - W-B CAN communication line Engine switch on (IG)

    Pulse generation

    (See waveform 2)
    A116-23 (E02) - Body ground BR - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
    A116-24 (+B2) - A116-35 (E1) B - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
    A116-26 (IGSW) - A116-35 (E1) R - W-B Engine switch signal Engine switch on (IG) 11 to 14 V
    A116-29 (FANH) - A116-35 (E1) G - W-B FAN No. 2 relay Engine switch on (IG) (cooling fan not operated) 11 to 14 V
    Idling with high engine coolant temperature (cooling fan operated at high speed) Below 1.5 V
    A116-32 (FPC) - A116-35 (E1) V - W-B Fuel pump control Engine stopped and Engine switch on (IG) (fuel pump not operate) 11 to 14 V
    Engine stopped and Engine switch on (IG) (fuel pump operate) Below 1.5 V
    A116-35 (E1) - Body ground W-B - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
    A116-36 (+B) - A116-35 (E1) B - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
    A116-40 (ST1-) - A116-35 (E1) Y - W-B Stop light switch assembly signal (opposite of voltage at STP terminal) Engine switch on (IG), brake pedal depressed Below 1.5 V
    Engine switch on (IG), brake pedal released 7.5 to 14 V
    A116-41 (MREL) - A116-35 (E1) GR - W-B EFI MAIN relay operation signal Engine switch on (IG) 11 to 14 V
    A116-42 (FANL) - A116-35 (E1) R - W-B FAN NO. 1 relay Engine switch on (IG) (cooling fan not operated) 11 to 14 V
    Idling with A/C on, or high engine coolant temperature (cooling fan operated) Below 1.5 V
    A116-45 (VCP2) - A116-46 (EPA2) W - B Power source of accelerator pedal position sensor (for VPA2) Engine switch on (IG) 4.5 to 5.5 V
    B142-38 (NEO) - A116-35 (E1) V - W-B Engine speed signal sent to other ECUs Idling with warm engine

    Pulse generation

    (See waveform 3)
    B142-40 (ENK1) - B142-39 (EKNK) R - G Knock sensor signal Engine speed maintained at 4000 rpm after warming up engine

    Pulse generation

    (See waveform 4)
    B142-42 (THA2) - B142-9 (E2) W - GR Intake air temperature sensor (vacuum sensor (munifold absolute pressure sensor)) signal Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
    B142-43 (VG) - B142-21 (E2G) G - P Mass air flow meter signal Idling, shift lever in neutral, A/C switch off 0.5 to 3.0 V
    B142-44 (OX1B) - B142-10 (EX1B) W - R Heated oxygen sensor (sensor 2) signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    Pulse generation

    (See waveform 5)
    B142-45 (VCPM) - B142-9 (E2) B - GR Power source of vacuum sensor (manifold absolute pressure sensor) Engine switch on (IG) 4.5 to 5.5 V
    B142-46 (HT1B) - A116-35 (E1) L - W-B Heated oxygen sensor (sensor 2) heater operation signal Idling Below 3.0 V
    Engine switch on (IG) 11 to 14 V
    B142-48 (M+) - A116-35 (E1) G - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

    Pulse generation

    (See waveform 6)
    B142-25 (OE1-) - A116-35 (E1) P - W-B Camshaft timing oil control valve assembly (for exhaust camshaft) operation signal Idling with warm engine

    Pulse generation

    (See waveform 7)
    B142-26 (OC1-) - A116-35 (E1) R - W-B Camshaft timing oil control valve assembly (for intalce camshaft) operation signal Idling with warm engine

    Pulse generation

    (See waveform 7)
    B142-30 (VTA1) - B142-3 (ETA) Y - V 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
    B142-31 (THW) - B142-15 (ETHW) V - BR Engine coolant temperature sensor signal Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
    B142-35 (M-) - A116-35 (E1) BR - W-B Throttle actuator operation signal (negative signal) Idling with warm engine

    Pulse generation

    (See waveform 8)
    B142-14 (PRG) - A116-35 (E1) L - W-B Purge VSV operation signal Engine switch on (IG) 11 to 14 V
    Idling, under purge control

    Pulse generation

    (See waveform 9)
    B142-17 (THA) - B142-9 (E2) L - GR Intake air temperature sensor (mass air flow meter) signal Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
    B142-18 (VTA2) - B142-3 (ETA) GR - V 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
    B142-19 (A1A+) - B142-33 (A1A-) R - G Heated oxygen sensor (sensor 1) signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    Pulse generation

    (See waveform 10)
    B142-20 (HA1A) - A116-35 (E1) G - W-B Heated oxygen sensor (sensor 1) heater operation signal Idling Below 3.0 V
    Engine switch on (IG) 11 to 14 V
    B142-4 (PIM) - B142-9 (E2) L - GR Vacuum sensor (manifold absolute pressure sensor) signal Idling with warm engine 1.2 to 2.0 V
    B142-5 (VCTA) - B142-3 (ETA) W - V Power source of throttle position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
    B142-9 (E2) - Body ground GR - Body ground Earth (ground) circuit of ECM Always Below 1 Ω
    B143-32 (NE+) - B143-15 (NE-) P - Y Crankshaft position sensor signal Idling with warm engine

    Pulse generation

    (See waveform 11)
    B143-29 (EV1+) - B143-22 (EV1-) GR - W Camshaft position sensor (for exhaust camshaft) signal Idling with warm engine

    Pulse generation

    (See waveform 12)
    B143-27 (IGT1) - A116-35 (E1) W - W-B Ignition coil assembly (No. 1 cylinder) signal (ignition signal) Idling with warm engine

    Pulse generation

    (See waveform 13)
    B143-25 (#10) - A116-11 (E01) B - BR Fuel injector assembly (No. 1 cylinder) Engine switch on (IG) 11 to 14 V
    Idling with warm engine

    Pulse generation

    (See waveform 14)
    B143-24 (VV1+) - B143-23 (VV1-) V - P Camshaft position sensor (for intake camshaft) signal Idling with warm engine

    Pulse generation

    (See waveform 12)
    B143-19 (IGT2) - A116-35 (E1) V - W-B Ignition coil assembly (No. 2 cylinder) signal (ignition signal) Idling with warm engine

    Pulse generation

    (See waveform 13)
    B143-17 (#20) - A116-11 (E01) GR - BR Fuel injector assembly (No. 2 cylinder) Engine switch on (IG) 11 to 14 V
    Idling with warm engine

    Pulse generation

    (See waveform 14)
    B143-13 (IGF1) - A116-35 (E1) Y - W-B Ignition coil assembly (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V
    Idling

    Pulse generation

    (See waveform 13)
    B143-11 (IGT3) - A116-35 (E1) G - W-B Ignition coil assembly (No. 3 cylinder) signal (ignition signal) Idling with warm engine

    Pulse generation

    (See waveform 13)
    B143-9 (#30) - A116-11 (E01) P - BR Fuel injector assembly (No. 3 cylinder) Engine switch on (IG) 11 to 14 V
    Idling with warm engine

    Pulse generation

    (See waveform 14)
    B143-5 (VCV1) - A116-35 (E1) R - W-B Power source of camshaft position sensor (for intake camshaft) (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
    B143-3 (IGT4) - A116-35 (E1) LG - W-B Ignition coil assembly (No. 4 cylinder) signal (ignition signal) Idling with warm engine

    Pulse generation

    (See waveform 13)
    B143-1 (#40) - A116-11 (E01) L - BR Fuel injector assembly (No. 4 cylinder) Engine switch on (IG) 11 to 14 V
    Idling with warm engine

    Pulse generation

    (See waveform 14)

  2. NETWORK GATEWAY ECU

    B00465YE01
    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    A118-1 (BATT) - A118-12 (GND) Y - BR Battery (for measuring battery voltage and for Gate way ECM memory) Always 11 to 14 V
    A118-2 (NC3O) - A118-12 (GND) B - BR Power source of Network gateway ECU ECM Engine switch on (IG) 11 to 14 V
    A118-4 (STP) - A118-12 (GND) Y - BR Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
    Brake pedal released 0 to 1.5 V
    A118-6 (CA1L) - A118-12 (GND) L - BR CAN communication line Engine switch on (IG)

    Pulse generation

    (See waveform 15)
    A118-7 (CA1H) - A118-12 (GND) W - BR CAN communication line Engine switch on (IG)

    Pulse generation

    (See waveform 16)
    A118-8 (CANL) - A118-12 (GND) W - BR CAN communication line Engine switch on (IG)

    Pulse generation

    (See waveform 17)
    A118-9 (CANH) - A118-12 (GND) L - BR CAN communication line Engine switch on (IG)

    Pulse generation

    (See waveform 18)
    A118-11 (EC) - Body ground W-B - Body ground Earth (ground) circuit of Network gateway ECU Always Below 1 Ω
    A118-12 (GND) - Body ground BR - Body ground Earth (ground) circuit of Network gateway ECU Always Below 1 Ω
    A118-13 (IG) - A118-12 (GND) Y - BR Engine switch signal Engine switch on (IG) 11 to 14 V
    A118-14 (STA) - A118-12 (GND) BR - BR Starter assembly signal Cranking 5.5 V or higher
    A118-16 (IMO) - A118-12 (GND) W - BR ID code box (immobiliser code ECU) communication output Engine switch off 11 to 14 V
    A118-17 (IMI) - A118-12 (GND) G - BR ID code box (immobiliser code ECU) communication input Engine switch off 11 to 14 V
    A118-20 (R) - A118-12 (GND) R - BR Back-up light switch assembly signal Engine switch on (IG), shift lever in R 11 to 14 V
    Engine switch on (IG), shift lever not in R Below 1 V
    A118-21 (W) - A118-12 (GND) B - BR MIL Engine switch on (IG) (MIL goes off) Below 1.5 V
    Idling 11 to 14 V
    A118-22 (SPD) - A118-12 (GND) V - BR Vehicle speed signal from combination meter assembly signal Driving at 20 km/h (12 mph)

    Pulse generation

    (See waveform 19)
    A118-24 (TC) - A118-12 (GND) L - BR Terminal TC of DLC3 Engine switch on (IG) 11 to 14 V

  3. WAVEFORM 1

    B0045W2E20
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANP and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  4. WAVEFORM 2

    B00457KE22
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANN and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  5. WAVEFORM 3

    B00464VE06
    Engine Speed 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.

  6. WAVEFORM 4

    B0045K4E26
    Knock Sensor Signal
    ECM Terminal Name Between KNK1 and EKNK
    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 condition.

  7. WAVEFORM 5

    B0046STE05
    Heated Oxygen Sensor Signal
    ECM Terminal Name Between OX1B and EX1B
    Tester Range 0.2 V/DIV., 200 ms./DIV.
    Condition Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    Tech Tips

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

  8. WAVEFORM 6

    B0045RWE73
    Throttle Actuator Positive Terminal Signal
    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.

  9. WAVEFORM 7

    B0045J3E08
    Camshaft Timing Oil Control Valve Assembly Operation Signal
    ECM Terminal Name Between OC1- and E1
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  10. WAVEFORM 7

    B0045J3E08
    Camshaft Timing Oil Control Valve Assembly Operation Signal
    ECM Terminal Name Between OE1- and E1
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  11. WAVEFORM 8

    B0046AHE67
    Throttle Actuator Negative Terminal Signal
    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. WAVEFORM 9

    B004794E34
    Purge VSV Operation Signal
    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition Idling, under purge control

    Tech Tips

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

  13. WAVEFORM 10

    B0046STE05
    Heated Oxygen Sensor Signal
    ECM Terminal Name Between A1A+ and A1A-
    Tester Range 0.2 V/DIV., 200 ms./DIV.
    Condition Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    Tech Tips

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

  14. WAVEFORM 11

    B004878E28
    Crankshaft Position Sensor Signal
    ECM Terminal Name Between NE+ and NE-
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  15. WAVEFORM 12

    B0047NEE45
    Camshaft Position Sensor Signal
    ECM Terminal Name

    CH1: Between VV1+ and VV1-

    CH2: Between EV1+ and EV1-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  16. WAVEFORM 13

    B00484ZE13
    Ignition Coil Assembly Signal (IGT and IGF Signal)
    ECM Terminal Name

    CH1: Between IGT (1 to 4) and E1

    CH2: 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.

  17. WAVEFORM 14

    B004745E04
    No. 1 (to No. 4) Fuel Injector Assembly Signal
    ECM Terminal Name Between #10 (to #40) 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.

  18. WAVEFORM 15

    B0045W2E20
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CA1L and GND
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  19. WAVEFORM 16

    B00457KE22
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CA1H and GND
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  20. WAVEFORM 17

    B0045W2E20
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANL and GND
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  21. WAVEFORM 18

    B00457KE22
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANH and GND
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  22. WAVEFORM 19

    B0045D8E10
    Vehicle Speed Signal
    ECM Terminal Name Between SPD and GND
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Driving at 20 km/h (12 mph)

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.