SFI SYSTEM TERMINALS OF ECM

A01FIC4E94

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
A19-7 (BATT) - F4-1 (E1) L - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
F1-1 (+BM) - F4-1 (E1) P - BR Power source of throttle motor Always 11 to 14 V
A19-8 (IGSW) - F4-1 (E1) B - BR Engine switch Engine switch on (IG) 11 to 14 V
A21-2 (+B) - F4-1 (E1) P - BR Power source of ECM Engine switch on (IG) 11 to 14 V
A21-1 (+B2) - F4-1 (E1) P - BR Power source of ECM Engine switch on (IG) 11 to 14 V
F1-12 (OC1+) - F1-11 (OC1-) W - Y Camshaft timing oil control valve (OCV) (Intake side (bank 1)) Idling

Pulse generation

(see waveform 1)
F1-10 (OC2+) - F1-9 (OC2-) LG - L Camshaft timing oil control valve (OCV) (Intake side (bank 2)) Idling

Pulse generation

(see waveform 1)
F2-4 (OE1+) - F2-3 (OE1-) LG - B Camshaft timing oil control valve (OCV) (Exhaust side (bank 1)) Idling

Pulse generation

(see waveform 1)
F3-18 (OE2+) - F3-28 (OE2-) W - G Camshaft timing oil control valve (OCV) (Exhaust side (bank 2)) Idling

Pulse generation

(see waveform 1)
A19-3 (MREL) - F4-1 (E1) Y - BR EFI MAIN1 relay Engine switch on (IG) 11 to 14 V
F2-34 (VCTA) - F2-35 (ETA) L - B Power source for throttle position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
F1-18 (VC) - F4-1 (E1) L - BR Power source for sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
F1-25 (VG) - F1-24 (E2G) R - W Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
F1-22 (THA) - F1-28 (E2) G - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
F1-19 (THW) - F1-28 (E2) R - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
F2-26 (VTA) - F2-35 (ETA) W - B Throttle position sensor (for engine control) Accelerator pedal fully released 0.5 to 1.1 V
F2-26 (VTA) - F2-35 (ETA) W - B Throttle position sensor (for engine control) Accelerator pedal fully depressed 3.2 to 4.8 V
F2-27 (VTA2) - F2-35 (ETA) L - B Throttle position sensor (for sensor malfunction detection) Accelerator pedal fully released 2.1 to 3.1 V
F2-27 (VTA2) - F2-35 (ETA) L - B Throttle position sensor (for sensor malfunction detection) Accelerator pedal fully depressed 4.6 to 5.0 V
A21-29 (NSW) - F4-1 (E1) G - BR Park/Neutral position switch signal Engine switch off to on (IG) 0 to 3.0 V
A19-4 (IREL) - F4-1 (E1) GR - BR INJ relay Engine switch on (IG) 10 to 14 V
A19-29 (VPA) - A19-20 (EPA) V - Y Accelerator pedal position sensor (for engine control) Engine switch on (IG), Accelerator pedal fully released 0.5 to 1.1 V
A19-29 (VPA) - A19-20 (EPA) V - Y Accelerator pedal position sensor (for engine control) Engine switch on (IG), Accelerator pedal fully depressed 2.6 to 4.5 V
A19-28 (VPA2) - A19-21 (EPA2)

G - BR*1

G - G*2

 Accelerator pedal position sensor (for sensor malfunctioning detection) Engine switch on (IG), Accelerator pedal fully released 1.2 to 2.0 V
A19-28 (VPA2) - A19-21 (EPA2)

G - BR*1

G - G*2

 Accelerator pedal position sensor (for sensor malfunctioning detection) Engine switch on (IG), Accelerator pedal fully depressed 3.4 to 5.0 V
A19-23 (VCPA) - A19-20 (EPA) L - Y Power source of accelerator pedal position sensor (for VPA) Engine switch on (IG) 4.5 to 5.5 V
A19-22 (VCP2) - A19-21 (EPA2)

LG - BR*1

R - G*2

 Power source of accelerator pedal position sensor (for VPA2) Engine switch on (IG) 4.5 to 5.5 V

F4-5 (HA1A) - F4-4 (E04)

F4-6 (HA2A) - F3-1 (E05)

L - W-B

B - W-B

 A/F sensor heater Idling

Pulse generation

(see waveform 2)

F4-5 (HA1A) - F4-4 (E04)

F4-6 (HA2A) - F3-1 (E05)

L - W-B

B - W-B

 A/F sensor heater Engine switch on (IG) 11 to 14 V
F3-23 (A1A+) - F4-1 (E1) R - BR A/F sensor Engine switch on (IG) 3.3 V*3
F3-21 (A2A+) - F4-1 (E1) B - BR A/F sensor Engine switch on (IG) 3.3 V*3
F3-22 (A1A-) - F4-1 (E1) G - BR A/F sensor Engine switch on (IG) 2.9 V*3
F3-20 (A2A-) - F4-1 (E1) W - BR A/F sensor Engine switch on (IG) 2.9 V*3

A21-4 (HT1B) - A21-5 (E03)

A21-3 (HT2B) - A21-5 (E03)

L - BR

LG - BR

 Heated oxygen sensor heater Idling Below 3.0 V

A21-4 (HT1B) - A21-5 (E03)

A21-3 (HT2B) - A21-5 (E03)

L - BR

LG - BR

 Heated oxygen sensor heater Engine switch on (IG) 11 to 14 V

A21-26 (OX1B) - F1-28 (E2)

A21-27 (OX2B) - F1-28 (E2)

R - BR

B - BR

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

Pulse generation

(see waveform 3)

F4-20 (#1) - F4-1 (E1)

F4-10 (#2) - F4-1 (E1)

F4-9 (#3) - F4-1 (E1)

F4-19 (#4) - F4-1 (E1)

F4-8 (#5) - F4-1 (E1)

F4-18 (#6) - F4-1 (E1)

LG - BR

L - BR

R - BR

P - BR

V - BR

W - BR

 Injector for direct injection Engine switch on (IG) 0 to 5 V

F4-20 (#1) - F4-1 (E1)

F4-10 (#2) - F4-1 (E1)

F4-9 (#3) - F4-1 (E1)

F4-19 (#4) - F4-1 (E1)

F4-8 (#5) - F4-1 (E1)

F4-18 (#6) - F4-1 (E1)

LG - BR

L - BR

R - BR

P - BR

V - BR

W - BR

 Injector for direct injection Idling

Pulse generation

(see waveform 4, 15)

F3-17 (#10) - F2-2 (E01)

F2-11 (#20) - F2-2 (E01)

F3-16 (#30) - F2-2 (E01)

F2-10 (#40) - F2-2 (E01)

F3-15 (#50) - F2-2 (E01)

F2-9 (#60) - F2-2 (E01)

Y - W-B

G - W-B

L - W-B

BR - W-B

P - W-B

R - W-B

 Injector for port injection Engine switch on (IG) 0 to 5 V

F3-17 (#10) - F2-2 (E01)

F2-11 (#20) - F2-2 (E01)

F3-16 (#30) - F2-2 (E01)

F2-10 (#40) - F2-2 (E01)

F3-15 (#50) - F2-2 (E01)

F2-9 (#60) - F2-2 (E01)

Y - W-B

G - W-B

L - W-B

BR - W-B

P - W-B

R - W-B

 Injector for port injection Idling

Pulse generation

(see waveform 5)
F4-26 (KNK1) - F4-33 (EKNK) B - W Knock sensor Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(see waveform 6)
F4-25 (KNK2) - F4-32 (EKN2) R - G Knock sensor Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(see waveform 6)
F2-24 (VV1+) - F2-32 (VV1-) Y - V Variable valve timing (VVT) sensor (Intake side (bank 1)) Idling

Pulse generation

(see waveform 7)
F3-19 (VV2+) - F3-29 (VV2-) GR - W Variable valve timing (VVT) sensor (Intake side (bank 2)) Idling

Pulse generation

(see waveform 7)
F1-27 (NE+) - F1-34 (NE-) W - B Crankshaft position sensor Idling

Pulse generation

(see waveform 7, 8)
F1-26 (EV1+) - F1-33 (EV1-) P - LG Variable valve timing (VVT) sensor (Exhaust side (bank 1)) Idling

Pulse generation

(see waveform 8)
F4-22 (EV2+) - F4-29 (EV2-) G - R Variable valve timing (VVT) sensor (Exhaust side (bank 2)) Idling

Pulse generation

(see waveform 8)

F3-27 (IGT1) - F4-1 (E1)

F2-23 (IGT2) - F4-1 (E1)

F3-26 (IGT3) - F4-1 (E1)

F2-22 (IGT4) - F4-1 (E1)

F3-25 (IGT5) - F4-1 (E1)

F2-21 (IGT6) - F4-1 (E1)

LG - BR

L - BR

V - BR

P - BR

V - BR

W - BR

 Ignition coil (ignition signal) Idling

Pulse generation

(see waveform 9)

F3-32 (IGF1) - F4-1 (E1)

F2-28 (IGF2) - F4-1 (E1)

G - BR

V - BR

 Ignition coil (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V

F3-32 (IGF1) - F4-1 (E1)

F2-28 (IGF2) - F4-1 (E1)

G - BR

V - BR

 Ignition coil (ignition confirmation signal) Idling

Pulse generation

(see waveform 9)
F1-17 (PRG) - F4-1 (E1) W - BR Purge VSV Engine switch on (IG) 11 to 14 V
F1-17 (PRG) - F4-1 (E1) W - BR Purge VSV Idling

Pulse generation

(see waveform 10)
A19-24 (SPD) - F4-1 (E1) SB - BR Speed signal from combination meter Driving at 20 km/h (12 mph)

Pulse generation

(see waveform 11)
A21-20 (STA) - F4-1 (E1) R - BR Starter signal Cranking 11 to 14 V
A19-13 (STP) - F4-1 (E1) R - BR Stop light switch Brake pedal depressed 7.5 to 14 V
A19-13 (STP) - F4-1 (E1) R - BR Stop light switch Brake pedal released Below 1.5 V
A19-12 (ST1-) - F4-1 (E1) GR - BR Stop light switch Engine switch on (IG), Brake pedal depressed Below 1.5 V
A19-12 (ST1-) - F4-1 (E1) GR - BR Stop light switch Engine switch on (IG), Brake pedal released 7.5 to 14 V
F2-7 (M+) - F2-5 (ME01) B - W-B Throttle actuator Idling with warm engine

Pulse generation

(see waveform 12)
F2-6 (M-) - F2-5 (ME01) W - W-B Throttle actuator Idling with warm engine

Pulse generation

(see waveform 13)
A19-5 (FPC) - F4-1 (E1) L - BR Fuel pump control Engine switch on (IG) Below 1.5 V
A19-11 (W) - F4-1 (E1) B - BR MIL

Engine switch on (IG)

(MIL goes on)

 Below 3.0 V
A19-11 (W) - F4-1 (E1) B - BR MIL Idling 0 to 3 V
A21-21 (TC) - F4-1 (E1) LG - BR Terminal TC of DLC3 Engine switch on (IG) 11 to 14 V
A19-15 (TACH) - F4-1 (E1) GR - BR Engine speed Idling

Pulse generation

(see waveform 14)
F1-16 (VPMP) - F4-1 (E1) G - BR Vent valve (built into canister pump module) Engine switch on (IG) 11 to 14 V
F1-15 (MPMP) - F4-1 (E1) R - BR Leak detection pump (built into canister pump module) Leak detection pump ON 9 to 14 V
F1-31 (PPMP) - F4-1 (E1) W - BR Canister pressure sensor (built into canister pump module) Engine switch on (IG) 3 to 3.6 V
F2-13 (INJ1) - F4-1 (E1) GR - BR Injector for direct injection confirmation signal Idling with warm engine

Pulse generation

(see waveform 15)
F2-12 (INJ2) - F4-1 (E1) B - BR Injector for direct injection confirmation signal Idling with warm engine

Pulse generation

(see waveform 15)
F2-15 (INJ3) - F4-1 (E1) Y - BR Injector for direct injection confirmation signal Idling with warm engine

Pulse generation

(see waveform 15)
F3-10 (FPF1) - F4-1 (E1) G - BR Fuel pump (for high pressure) [Spill valve] Idling with warm engine

Pulse generation

(see waveform 16)
F3-11 (FPD) - F4-1 (E1) LG - BR Fuel pump (for high pressure) [Spill valve] Idling with warm engine

Pulse generation

(see waveform 16)
F4-27 (PR) - F1-28 (E2) V - BR Fuel pressure sensor Idling 1.8 to 2.3 V
A19-27 (NEO) - F4-1 (E1) W - BR Engine speed signal sent to certification ECU (smart key ECU assembly) Idling with warm engine Pulse generation (See waveform 19)
A19-25 (KSW) - F4-1 (E1) L - BR Key in vehicle signal Engine switch off → on (IG) 0 to 3V
A19-19 (RFC) - F4-1 (E1) GR - BR Cooling fan control signal Engine switch on (IG), A/C switch on (max cool) Pulse generation (See waveform 20)
F2-18 (ALT) - F4-1(E1) P - BR Generator Engine switch on (IG) 11 to 14 V
A21-14 (CANH) - F4-1 (E1) G - BR CAN communication line Engine switch on (IG)

Pulse generation

(see waveform 17)
A21-10 (CANU) - F4-1 (E1) P - BR CAN communication line Engine switch on (IG)

Pulse generation

(see waveform 17)
A21-12 (CANP) - F4-1 (E1) B - BR CAN communication line Engine switch on (IG)

Pulse generation

(see waveform 17)
A21-13 (CANL) - F4-1 (E1) W - BR CAN communication line Engine switch on (IG)

Pulse generation

(see waveform 18)
A21-9 (CAND) - F4-1 (E1) SB - BR CAN communication line Engine switch on (IG)

Pulse generation

(see waveform 18)
A21-11 (CANN) - F4-1 (E1) W - BR CAN communication line Engine switch on (IG)

Pulse generation

(see waveform 18)

Tech Tips

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


  1. WAVEFORM 1

    A01FFS2E11
    Camshaft Timing Oil Control Valve (OCV)
    ECM Terminal Name

    Between OC1+ and OC1- or OC2+ and OC2-

    Between OE1+ and OE1- or OE2+ and OE2-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  2. WAVEFORM 2

    A01FFHBE01
    Air Fuel Ratio Sensor Heater:
    ECM Terminal Name Between HA1A and E04 or HA2A and E05
    Tester Range 5 V/DIV, 10 ms./DIV
    Condition Idling

    Tech Tips

    The wavelength varies in accordance with the engine operating condition.

  3. WAVEFORM 3

    A01FEZLE15
    Heated Oxygen Sensor
    ECM Terminal Name Between OX1B and E2 or OX2B and E2
    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 Data List, item O2S B1S2 and O2S B2S2 shows the ECM input values from the heated oxygen sensor.

  4. WAVEFORM 4

    A01FGOME02
    Injector for Direct Injection No. 1 (to No. 6) Injection Signal
    ECM Terminal Name Between #1 (to #6) and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

    • When the direct injection injectors are operating, Direct is displayed for Injection Way of the Data List.

  5. WAVEFORM 5

    A01FF6DE02
    Injector for Port Injection No. 1 (to No. 6) Injection Signal:
    ECM Terminal Name Between #10 (to #60) and E01
    Tester Range 20 V/DIV., 1 ms./DIV.
    Condition Idling

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

    • When the port injection injectors are operating, Port is displayed for Injection Way of the Data List.

  6. WAVEFORM 6

    A01FH42E24
    Knock Sensor
    ECM Terminal Name

    Between KNK1 and EKNK

    Between 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.

  7. WAVEFORM 7

    A01FEPLE12
    Crankshaft Position Sensor and VVT Sensor for Intake Camshaft
    ECM Terminal Name

    Between NE+ and NE-

    Between VV1+ and VV1- or VV2+ and VV2-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8

    A01FEIFE07
    Crankshaft Position Sensor and VVT Sensor for Exhaust Camshaft
    ECM Terminal Name

    Between NE+ and NE-

    Between EV1+ and EV1- or EV2+ and EV2-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  9. WAVEFORM 9

    A01FH0CE06
    Igniter IGT Signal (from ECM to igniter) and Igniter IGF Signal (from igniter to ECM)
    ECM Terminal Name

    CH1: Between IGT (1 to 6) and E1

    CH2: Between IGF1 and E1 or IGF2 and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  10. WAVEFORM 10

    A01FHQPE02
    Purge VSV
    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

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

  11. WAVEFORM 11

    A01FHJ6E29
    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.

  12. WAVEFORM 12

    A01FIPHE03
    Throttle Actuator 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.

  13. WAVEFORM 13

    A01FGTWE01
    Throttle Actuator 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.

  14. WAVEFORM 14

    A01FG59E11
    Engine Speed Signal
    ECM Terminal Name Between TACH and E1
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  15. WAVEFORM 15

    A01FEIQE10
    Injector for Direct Injection No. 1 (to No. 6) Injection Signal and Injection Confirmation Signal
    ECM Terminal Name

    CH1: Between #1 or #4 and E1, CH2: Between INJ1 and E1

    CH1: Between #2 or #5 and E1, CH2: Between INJ2 and E1

    CH1: Between #3 or #6 and E1, CH2: Between INJ3 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.

  16. WAVEFORM 16

    A01FFPPE02
    Fuel Pump for High Pressure (Spill Valve)
    ECM Terminal Name

    CH1: Between FPD and E1

    CH2: Between FPF1 and E1
    Tester Range 2 V/DIV., 5 ms./DIV.
    Condition Idling with warm engine

  17. WAVEFORM 17

    A01FIX2E48
    CAN Communication Signal
    ECM Terminal Name

    Between CANH and E1

    Between CANU and E1

    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.

  18. WAVEFORM 18

    A01FGD5E44
    CAN Communication Signal
    ECM Terminal Name

    Between CANL and E1

    Between CAND and E1

    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.

  19. WAVEFORM 19

    A01FE2YE01
    Engine Speed Signal
    ECM Terminal Name Between NEO and E1
    Tester Range 1 V/DIV., 2ms/DIV.
    Condition Idling with warm engine

  20. WAVEFORM 20

    A01FGMUE01
    Cooling Fan Control Signal
    ECM Terminal Name Between RFC and E1
    Tester Range 1 V/DIV., 20 ms./DIV.
    Condition Engine switch on (IG), A/C switch on (max cool)

    Tech Tips

    The wavelength becomes shorter as the engine coolant temperature.