SFI SYSTEM(w/o Canister Pump Module) TERMINALS OF ECM

B0075QLE20

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
A91-1 (BATT) - F66-53 (E1) L - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A91-2 (+B) - F66-53 (E1) R - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
A91-3 (+B2) - F66-53 (E1) B - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
A91-6 (IGSW) - F66-53 (E1) B - W-B Engine switch signal Engine switch on (IG) 11 to 14 V
A91-8 (IREL) - F66-53 (E1) B - W-B INJ relay operation signal Engine stopped, engine switch on (IG) 0 to 1.5 V
A91-9 (STP) - F66-53 (E1) R - W-B Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released 0 to 1.5 V
A91-10 (ST1-) - F66-53 (E1) P - W-B

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
A91-11 (IWPI) - F66-53 (E1) P - W-B Electric water pump assembly signal Electric water pump assembly operating Pulse generation
A91-13 (CANH) - F66-53 (E1) R - W-B CAN communication line Engine stopped, engine switch on (IG)

Pulse generation

(See waveform 1)
A91-14 (EC) - Body ground W-B - - Ground Always Below 1 Ω
A91-21 (FPC) - F66-53 (E1) P - W-B Fuel pump control Engine stopped, engine switch on (IG) Below 1.5 V
A91-23 (SNWI) - F66-53 (E1) P - W-B SNOW mode switch signal Engine switch on (IG) 11 to 14 V
Engine switch on (IG), SNOW mode switch being pushed and held Below 1.5 V
A91-24 (IWPO) - F66-53 (E1) V - W-B Electric water pump assembly signal Electric water pump assembly operating Pulse generation
A91-26 (CANL) - F66-53 (E1) B - W-B CAN communication line Engine stopped, engine switch on (IG)

Pulse generation

(See waveform 2)
A91-29 (STA) - F66-53 (E1)

B*2 - W-B

R*3 - W-B

 Starter assembly signal Cranking 6.0 V or higher
A91-30 (NEO) - F66-53 (E1) B - W-B Engine speed signal sent to other ECUs Idling with warm engine

Pulse generation

(See waveform 3)
A91-31 (TACH) - F66-53 (E1) W - W-B Engine speed signal Idling with warm engine

Pulse generation

(See waveform 4)
A91-33 (TC) - F66-53 (E1) V - W-B Terminal TC of DLC3 Engine stopped, engine switch on (IG) 11 to 14 V
A91-44 (SPD) - F66-53 (E1) P - W-B Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 5)
A91-46 (MREL) - F66-53 (E1) Y - W-B EFI-MAIN relay operation signal Engine switch on (IG) 11 to 14 V
A91-47 (VPA) - A91-48 (EPA) G - L 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
A91-49 (VCPA) - A91-48 (EPA) R - L Power source of accelerator pedal position sensor (for VPA) Engine stopped, engine switch on (IG) 4.5 to 5.5 V
A91-50 (VPA2) - A91-51 (EPA2) P - 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
A91-52 (VCP2) - A91-51 (EPA2) R - B Power source of accelerator pedal position sensor (for VPA2) Engine stopped, engine switch on (IG) 4.5 to 5.5 V
A91-57 (NSW) - F66-53 (E1) L - W-B Park/Neutral position switch assembly signal Engine switch on (IG), shift lever not in P or N 11 to 14 V
Engine switch on (IG), shift lever in P or N Below 3.0 V
A91-58 (KSW) - F66-53 (E1) P - W-B Key in vehicle signal Engine switch off → on (IG) 0 to 3.0 V
A91-59 (S) - F66-53 (E1) GR - W-B M shift position switch signal Engine switch on (IG), shift lever in M 11 to 14 V
Engine switch on (IG), shift lever not in M Below 1 V
A91-60 (RFC) - F66-53 (E1) G - W-B Cooling fan control signal Engine switch on (IG), A/C switch on (max cool)

Pulse generation

(See waveform 6)
F66-9 (OC1+) - F66-8 (OC1-) W - Y Cam timing oil control solenoid assembly operation signal Idling

Pulse generation

(See waveform 7)
F66-16 (M+) - F66-49 (ME01) B - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(See waveform 8)
F66-17 (HT1B) - F66-53 (E1) G - W-B Heated oxygen sensor heater operation signal Engine stopped, engine switch on (IG) 11 to 14 V
Idling with cold engine 0 to 3.0 V
F66-18 (E04) - Body ground W-B - - Ground Always Below 1 Ω
F66-19 (HA1A) - F66-18 (E04) L - W-B Air fuel ratio sensor heater operation signal Engine stopped, engine switch on (IG) 11 to 14 V
Idling with cold engine

Pulse generation

(See waveform 9)
F66-21 (#2D+) - F66-20 (#2D-) L - Y No. 2 direct fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct" Pulse generation
F66-22 (#3D+) - F66-23 (#3D-) BR - G No. 3 direct fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct" Pulse generation
F66-25 (#4D+) - F66-24 (#4D-) B - W No. 4 direct fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct" Pulse generation
F66-26 (#1D+) - F66-27 (#1D-) P - V No. 1 direct fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Direct" Pulse generation
F66-28 (FP1+) - F66-29 (FP1-) W - B Fuel pump assembly (for high pressure side) signal Engine running (direct injection control) Pulse generation
F66-30 (+BD1) - F66-53 (E1) B - W-B Power source of ECU (injector driver) Engine stopped, engine switch on (IG) 11 to 14 V
F66-34 (D) - F66-53 (E1) W - W-B D shift position switch signal Engine switch on (IG), shift lever in D or M 11 to 14 V
Engine switch on (IG), shift lever not in D or M Below 1 V
F66-35 (R) - F66-53 (E1) R - W-B R shift position switch 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
F66-37 (WGV+) - F66-36 (WGV-) B - LG Vacuum regulating valve assembly operation signal Vacuum regulating valve assembly operating Pulse generation
F66-38 (OE1+) - F66-68 (OE1-) LG - B Camshaft timing oil control valve assembly (for exhaust camshaft) operation signal Idling

Pulse generation

(See waveform 10)
F66-39 (IGT4) - F66-53 (E1) P - W-B

No. 4 ignition coil assembly signal

(ignition signal)

 Idling with warm engine

Pulse generation

(See waveform 11)
F66-40 (IGT3) - F66-53 (E1) V - W-B

No. 3 ignition coil assembly signal

(ignition signal)

 Idling with warm engine

Pulse generation

(See waveform 11)
F66-41 (IGT2) - F66-53 (E1) L - W-B

No. 2 ignition coil assembly signal

(ignition signal)

 Idling with warm engine

Pulse generation

(See waveform 11)
F66-42 (IGT1) - F66-53 (E1) LG - W-B

No. 1 ignition coil assembly signal

(ignition signal)

 Idling with warm engine

Pulse generation

(See waveform 11)
F66-46 (M-) - F66-49 (ME01) W - W-B Throttle actuator operation signal (negative signal) Idling with warm engine

Pulse generation

(See waveform 12)
F66-47 (GE01) - Body ground BR - - Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
F66-48 (+BM) - F66-53 (E1) P - W-B Power source of throttle actuator Always 11 to 14 V
F66-49 (ME01) - Body ground W-B - - Ground Always Below 1 Ω
F66-50 (E02) - Body ground W-B - - Ground Always Below 1 Ω
F66-51 (E01) - Body ground W-B - - Ground Always Below 1 Ω
F66-53 (E1) - Body ground W-B - - Ground Always Below 1 Ω
F66-54 (#20) - F66-51 (E01) Y - W-B No. 2 port fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(See waveform 13)
F66-55 (#30) - F66-51 (E01) GR - W-B No. 3 port fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(See waveform 13)
F66-56 (#40) - F66-51 (E01) G - W-B No. 4 port fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(See waveform 13)
F66-57 (#10) - F66-51 (E01) L - W-B No. 1 port fuel injector assembly signal Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(See waveform 13)
F66-58 (E1D2) - Body ground W-B - - Ground Always Below 1 Ω
F66-59 (E1D1) - Body ground W-B - - Ground Always Below 1 Ω
F66-60 (+BD2) - F66-53 (E1) W - W-B Power source of ECU (injector driver) Engine stopped, engine switch on (IG) 11 to 14 V
F66-64 (P) - F66-53 (E1) B - W-B P shift position switch signal Engine switch on (IG), shift lever in P 11 to 14 V
Engine switch on (IG), shift lever not in P Below 1 V
F66-65 (N) - F66-53 (E1) G - W-B N shift position switch signal Engine switch on (IG), shift lever in N 11 to 14 V
Engine switch on (IG), shift lever not in N Below 1 V
F66-67 (ABV) - F66-53 (E1) G - W-B Air by-pass valve assembly operation signal Engine stopped, engine switch on (IG) 11 to 14 V
Air by-pass valve assembly operating 1.5 V or less
F66-69 (EOJV) - F66-53 (E1) L - W-B Oil pressure switching valve assembly operation signal Oil pressure switching valve assembly operating 1.5 V or less
Oil pressure switching valve assembly not operating 11 to 14 V
F66-70 (PRG) - F66-53 (E1) W - W-B Purge VSV operation signal Engine stopped, engine switch on (IG) 11 to 14 V
Idling with warm engine, under purge control

Pulse generation

(See waveform 14)
F66-76 (NE+) - F66-109 (NE-) L - B Crankshaft position sensor signal Idling with warm engine

Pulse generation

(See waveform 15)
F66-81 (EV1+) - F66-112 (EV1-) P - LG Camshaft position sensor (for exhaust camshaft) signal Idling with warm engine

Pulse generation

(See waveform 16)
F66-82 (VV1+) - F66-114 (VV1-) Y - V Camshaft position sensor (for intake camshaft) signal Idling with warm engine

Pulse generation

(See waveform 16)
F66-88 (VTA2) - F66-120 (ETA) L - R Throttle position sensor signal (for sensor malfunction detection) Engine switch on (IG), accelerator pedal fully released 2.1 to 3.1 V
Accelerator pedal fully depressed (engine running) 4.6 to 5.0 V
F66-92 (VG) - F66-91 (E2G) R - W Mass air flow meter sub-assembly signal Idling, shift lever in P or N, A/C switch off 0.5 to 3.0 V
F66-94 (THA) - F66-93 (ETHA) L - BR Intake air temperature sensor (mass air flow meter sub-assembly) signal Idling, intake air temperature 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
F66-97 (THEO) - F66-96 (ETHE) V - B Engine oil temperature sensor signal Idling with warm engine 0 to 5 V
F66-98 (PEO) - F66-129 (EPEO) L - W Oil pressure sender gauge assembly signal Idling with warm engine 0.5 to 4.5 V
F66-99 (OX1B) - F66-100 (EX1B) B - W Heated oxygen sensor signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 17)
F66-101 (IGF1) - F66-53 (E1) G - W-B

Ignition coil assembly

(ignition confirmation signal)

 Engine switch on (IG) 4.5 to 5.5 V
Idling with warm engine

Pulse generation

(See waveform 11)
F66-102 (PFL) - F66-133 (EPFL) W - L Fuel pressure sensor (for low pressure side) signal Idling with warm engine 0.75 to 4.5 V
F66-103 (PR) - F66-135 (EPR) B - W Fuel pressure sensor (for high pressure side) signal Idling with warm engine 0.5 to 4.5 V
F66-104 (THW) - F66-105 (ETHW) R - BR Engine coolant temperature sensor signal Idling, engine coolant temperature 75 to 100°C (167 to 212°F) 0.2 to 1.0 V
F66-106 (PIM) - F66-137 (EPIM) L - P Manifold absolute pressure sensor (No. 1 turbo pressure sensor) signal Idling with warm engine 1.0 to 4.5 V
F66-107 (THIM) - F66-53 (E1) G - W-B Intake air temperature sensor (No. 1 turbo pressure sensor) signal Idling with warm engine 0 to 5.25 V
F66-108 (PTA) - F66-139 (EPTA) B - R Boost pressure sensor (No. 2 turbo pressure sensor) signal Idling with warm engine 1.0 to 4.5 V
F66-110 (VCNE) - F66-53 (E1) W - W-B Power source of crankshaft position sensor (specific voltage) Engine stopped, engine switch on (IG) 4.5 to 5.5 V
F66-111 (VCE1) - F66-53 (E1) L - W-B Power source of camshaft position sensor (for exhaust camshaft) (specific voltage) Engine stopped, engine switch on (IG) 4.5 to 5.5 V
F66-113 (VCV1) - F66-53 (E1) W - W-B Power source of camshaft position sensor (for intake camshaft) (specific voltage) Engine stopped, engine switch on (IG) 4.5 to 5.5 V
F66-121 (VCTA) - F66-120 (ETA) G - R Power source of throttle position sensor (specific voltage) Engine stopped, engine switch on (IG) 4.5 to 5.5 V
F66-122 (VTA1) - F66-120 (ETA) V - R Throttle position sensor signal (for engine control) Engine switch on (IG), accelerator pedal fully released 0.6 to 1.1 V
Accelerator pedal fully depressed (engine running) 3.2 to 4.8 V
F66-124 (KNK1) - F66-123 (EKNK) R - G Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 18)
F66-130 (VCPE) - F66-53 (E1) G - W-B Power source of oil pressure sender gauge assembly (specific voltage) Engine stopped, engine switch on (IG) 4.75 to 5.25 V
F66-131 (A1A+) - F66-53 (E1) R - W-B Air fuel ratio sensor signal Engine stopped, engine switch on (IG) 3.0 to 3.6 V*1
F66-132 (A1A-) - F66-53 (E1) G - W-B Air fuel ratio sensor signal Engine stopped, engine switch on (IG) 2.7 to 3.3 V*1
F66-134 (VCPF) - F66-53 (E1) R - W-B Power source of fuel pressure sensor (for low pressure side) (specific voltage) Engine stopped, engine switch on (IG) 4.75 to 5.25 V
F66-136 (VCPR) - F66-53 (E1) GR - W-B Power source of fuel pressure sensor (for high pressure side) (specific voltage) Engine stopped, engine switch on (IG) 4.75 to 5.25 V
F66-138 (VCPM) - F66-53 (E1) W - W-B Power source of No. 1 turbo pressure sensor (specific voltage) Engine stopped, engine switch on (IG) 4.75 to 5.25 V
F66-140 (VPTA) - F66-53 (E1) W - W-B Power source of No. 2 turbo pressure sensor (specific voltage) Engine stopped, engine switch on (IG) 4.75 to 5.25 V


  1. WAVEFORM 1

    B0076DIE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANH and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine stopped, engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  2. WAVEFORM 2

    B0075LGE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANL and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine stopped, engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  3. WAVEFORM 3

    B0077FOE02
    *a 1 V/DIV.
    *b 2 ms./DIV.
    Engine Speed Signal
    ECM Terminal Name Between NEO and E1
    Tester Range 1 V/DIV., 2 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  4. WAVEFORM 4

    B0075XDE01
    *a 5 V/DIV.
    *b 10 ms./DIV.
    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.

  5. WAVEFORM 5

    B0072ZUE11
    *a 2 V/DIV.
    *b 20 ms./DIV.
    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.

  6. WAVEFORM 6

    B0074ZWE08
    *a 1 V/DIV.
    *b 20 ms./DIV.
    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 duty ratio varies depending on the engine coolant temperature.

  7. WAVEFORM 7

    B00735OE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Cam Timing Oil Control Solenoid Assembly Operation Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  8. WAVEFORM 8

    B007780E20
    *a 5 V/DIV.
    *b 1 ms./DIV.
    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 9

    B0075ALE04
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Air Fuel Ratio Sensor Heater Operation Signal
    ECM Terminal Name Between HA1A and E04
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling with cold engine

  10. WAVEFORM 10

    B00735OE02
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil control Valve Assembly (for Exhaust Camshaft) Operation Signal
    ECM Terminal Name Between OE1+ and OE1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  11. WAVEFORM 11

    B0075N3E05
    *a 2 V/DIV.
    *b 20 ms./DIV.
    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.

  12. WAVEFORM 12

    B00746DE22
    *a 5 V/DIV.
    *b 1 ms./DIV.
    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.

  13. WAVEFORM 13

    B00735SE11
    *1 20 V/DIV.
    *2 20 ms./DIV.
    No. 1 (to No. 4) Port 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, Data List item "Injection Mode" displaying "Port"

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

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

  14. WAVEFORM 14

    B0073APE05
    *1 10 V/DIV.
    *2 20 ms./DIV.
    Purge VSV Operation Signal
    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine, 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.

  15. WAVEFORM 15

    B0073X8E03
    *a 2 V/DIV.
    *b 20 ms./DIV.
    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.

  16. WAVEFORM 16

    B00779XE20
    *a 5 V/DIV.
    *b 20 ms./DIV.
    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.

  17. WAVEFORM 17

    B0076WLE01
    *1 0.2 V/DIV.
    *2 200 ms./DIV.
    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

    Data List item "O2 Sensor Voltage B1S2" shows the ECM values from the heated oxygen sensor.

  18. WAVEFORM 18

    B0072TDE01
    *a 1 V/DIV.
    *b 1 ms./DIV.
    Knock Control 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 will differ slightly depending on the vehicle.