SFI SYSTEM TERMINALS OF ECM

A0030BSE07

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
A173-1 (BATT) - B208-53 (E1) B - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A173-2 (+B) - B208-53 (E1) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A173-3 (+B2) - B208-53 (E1) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A173-6 (IGSW) - B208-53 (E1) L - W-B Ignition switch signal Ignition switch ON 11 to 14 V
A173-8 (IREL) - B208-53 (E1) B - W-B INJ relay operation signal Engine stopped, ignition switch ON 0 to 1.5 V
A173-9 (STP) - B208-53 (E1) L - W-B Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released 0 to 1.5 V
A173-10 (ST1-) - B208-53 (E1) R - W-B

Stop light switch assembly signal

(opposite to STP terminal)

 Ignition switch ON, brake pedal depressed 0 to 1.5 V
Ignition switch ON, brake pedal released 7.5 to 14 V
A173-11 (WP1) - B208-53 (E1) V - W-B Electric water pump assembly signal Electric water pump assembly operating Pulse generation
A173-13 (CANH) - B208-53 (E1) B - W-B CAN communication signal Engine stopped, ignition switch ON

Pulse generation

(See waveform 1)
A173-14 (EC) - Body ground BR - - Ground Always Below 1 Ω
A173-21 (FPC) - B208-53 (E1) V - W-B Fuel pump control Engine stopped, ignition switch ON Below 1.5 V
A173-24 (WPO) - B208-53 (E1) SB - W-B Electric water pump assembly signal Electric water pump assembly operating Pulse generation
A173-26 (CANL) - B208-53 (E1) W - W-B CAN communication signal Engine stopped, ignition switch ON

Pulse generation

(See waveform 2)
A173-27 (W) - B208-53 (E1) LG - W-B Malfunction Indicator Lamp (MIL) operation signal

Engine stopped, ignition switch ON

(MIL illuminated)

 0 to 1.5 V
Idling 11 to 14 V
A173-29 (STA) - B208-53 (E1) LG - W-B Starter operation signal Cranking 6.0 V or higher
A173-30 (NEO) - B208-53 (E1) L - W-B Engine speed signal sent to other ECUs Idling with warm engine

Pulse generation

(See waveform 3)
A173-31 (TACH) - B208-53 (E1) GR - W-B Engine speed signal Idling with warm engine

Pulse generation

(See waveform 4)
A173-33 (TC) - B208-53 (E1) P - W-B Terminal TC of DLC3 Engine stopped, ignition switch ON 11 to 14 V
A173-44 (SPD) - B208-53 (E1) V - W-B Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 5)
A173-46 (MREL) - B208-53 (E1) L - W-B EFI-MAIN relay operation signal Engine stopped, ignition switch ON 11 to 14 V
A173-47 (VPA) - A173-48 (EPA) W - Y Accelerator pedal position sensor signal (for engine control) Ignition switch ON, accelerator pedal fully released 0.5 to 1.1 V
Ignition switch ON, accelerator pedal fully depressed 2.6 to 4.5 V
A173-49 (VCPA) - A173-48 (EPA) B - Y Power source of accelerator pedal position sensor (for VPA) Engine stopped, ignition switch ON 4.5 to 5.5 V
A173-50 (VPA2) - A173-51 (EPA2) R - P Accelerator pedal position sensor signal Ignition switch ON, accelerator pedal fully released 1.2 to 2.0 V
Ignition switch ON, accelerator pedal fully depressed 3.4 to 4.75 V
A173-52 (VCP2) - A173-51 (EPA2) L - P Power source of accelerator pedal position sensor (for VPA2) Engine stopped, ignition switch ON 4.5 to 5.5 V
A173-57 (NSW) - B208-53 (E1) W - W-B Park/neutral position switch assembly signal Ignition switch ON, shift lever not in P or N 11 to 14 V
Ignition switch ON, shift lever in P or N Below 3.0 V
A173-58 (KSW)*3 - B208-53 (E1) V - W-B Key in vehicle signal Ignition switch off → ON 0 to 3.0 V
A173-58 (KSW)*2 - B208-53 (E1) V - W-B Unlock warning switch signal Key in ignition key cylinder 0 to 3.0 V
A173-59 (S)*1 - B208-53 (E1) L - W-B M shift position switch signal Ignition switch ON, shift lever in M 11 to 14 V
Ignition switch ON, shift lever not in M Below 1 V
A173-60 (RFC) - B208-53 (E1) R - W-B Cooling fan control signal Ignition switch ON, A/C switch on (max cool)

Pulse generation

(See waveform 6)
B208-9 (OC1+) - B208-8 (OC1-) B - Y Cam timing oil control solenoid assembly (for intake camshaft) operation signal Idling

Pulse generation

(See waveform 7)
B208-16 (M+) - B208-49 (ME01) V - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(See waveform 8)
B208-17 (HT1B) - B208-53 (E1) L - W-B Heated oxygen sensor heater operation signal Engine stopped, ignition switch ON 11 to 14 V
Idling with cold engine Below 3.0 V
B208-18 (E04) - Body ground W-B - - Ground Always Below 1 Ω
B208-19 (HA1A) - B208-18 (E04) R - W-B Air fuel ratio sensor heater operation signal Engine stopped, ignition switch ON 11 to 14 V
Idling with cold engine

Pulse generation

(See waveform 9)
B208-21 (#2D+) - B208-20 (#2D-) B - W No. 2 fuel injector assembly signal Idling with warm engine Pulse generation
B208-22 (#3D+) - B208-23 (#3D-) R - G No. 3 fuel injector assembly signal Idling with warm engine Pulse generation
B208-25 (#4D+) - B208-24 (#4D-) L - Y No. 4 fuel injector assembly signal Idling with warm engine Pulse generation
B208-26 (#1D+) - B208-27 (#1D-) P - V No. 1 fuel injector assembly signal Idling with warm engine Pulse generation
B208-28 (FP1+) - B208-29 (FP1-) P - V Fuel pump (for high pressure side) signal Engine running Pulse generation
B208-30 (+BD1) - B208-53 (E1) R - W-B Power source of ECU (injector driver) Engine stopped, ignition switch ON 11 to 14 V
B208-34 (D)*1 - B208-53 (E1) GR - W-B D shift position switch signal Ignition switch ON, shift lever in D or M 11 to 14 V
Ignition switch ON, shift lever not in D or M Below 1 V
B208-34 (D)*5 - B208-53 (E1) GR - W-B Clutch pedal switch (upper switch) signal Ignition switch ON, clutch pedal fully depressed Below 1 V
Ignition switch ON, clutch pedal fully released 11 to 14 V
B208-35 (R) - B208-53 (E1) L - W-B R shift position switch signal Ignition switch ON, shift lever in R 11 to 14 V
Ignition switch ON, shift lever not in R Below 1 V
B208-37 (WGV+) - B208-36 (WGV-) B - R Vacuum regulating valve assembly operation signal Vacuum regulating valve assembly operating Pulse generation
B208-38 (OE1+) - B208-68 (OE1-) G - P Cam timing oil control solenoid assembly (for exhaust camshaft) operation signal Idling

Pulse generation

(See waveform 10)
B208-39 (IGT4) - B208-53 (E1) W - W-B

No. 4 ignition coil assembly signal

(ignition signal)

 Idling with warm engine

Pulse generation

(See waveform 11)
B208-40 (IGT3) - B208-53 (E1) G - W-B

No. 3 ignition coil assembly signal

(ignition signal)

 Idling with warm engine

Pulse generation

(See waveform 11)
B208-41 (IGT2) - B208-53 (E1) B - W-B

No. 2 ignition coil assembly signal

(ignition signal)

 Idling with warm engine

Pulse generation

(See waveform 11)
B208-42 (IGT1) - B208-53 (E1) R - W-B

No. 1 ignition coil assembly signal

(ignition signal)

 Idling with warm engine

Pulse generation

(See waveform 11)
B208-46 (M-) - B208-49 (ME01) P - W-B Throttle actuator operation signal (negative terminal) Idling with warm engine

Pulse generation

(See waveform 12)
B208-47 (GE01) - Body ground BR - - Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
B208-48 (+BM) - B208-53 (E1) B - W-B Power source of throttle actuator Always 11 to 14 V
B208-49 (ME01) - Body ground W-B - - Ground Always Below 1 Ω
B208-50 (E02) - Body ground W-B - - Ground Always Below 1 Ω
B208-51 (E01) - Body ground W-B - - Ground Always Below 1 Ω
B208-53 (E1) - Body ground W-B - - Ground Always Below 1 Ω
B208-58 (E1D2) - Body ground W - - Ground Always Below 1 Ω
B208-59 (E1D1) - Body ground B - - Ground Always Below 1 Ω
B208-60 (+BD2) - B208-53 (E1) G - W-B Power source of ECU (injector driver) Engine stopped, ignition switch ON 11 to 14 V
B208-64 (P)*1 - B208-53 (E1) V - W-B P shift position switch signal Ignition switch ON, shift lever in P 11 to 14 V
Ignition switch ON, shift lever not in P Below 1 V
B208-65 (N)*1 - B208-53 (E1) B - W-B N shift position switch signal Ignition switch ON, shift lever in N 11 to 14 V
Ignition switch ON, shift lever not in N Below 1 V
B208-67 (ABV) - B208-53 (E1) Y - W-B Air by-pass valve operation signal Engine stopped, ignition switch ON 11 to 14 V
Air by-pass valve operating 1.5 V or less
B208-69 (EOJV) - B208-53 (E1) V - 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
B208-70 (PRG) - B208-53 (E1) L - W-B Purge VSV operation signal Engine stopped, ignition switch ON 11 to 14 V
Idling with warm engine, under purge control

Pulse generation

(See waveform 13)
B208-76 (NE+) - B208-109 (NE-) R - Y Crankshaft position sensor signal Idling with warm engine

Pulse generation

(See waveform 14)
B208-81 (EV1+) - B208-112 (EV1-) R - B Camshaft position sensor (for exhaust camshaft) signal Idling with warm engine

Pulse generation

(See waveform 15)
B208-82 (VV1+) - B208-114 (VV1-) B - P Camshaft position sensor (for intake camshaft) signal Idling with warm engine

Pulse generation

(See waveform 15)
B208-88 (VTA2) - B208-120 (ETA) R - L Throttle position sensor signal (for sensor malfunction detection) Ignition switch ON, accelerator pedal fully released 2.1 to 3.1 V
Engine running, accelerator pedal fully depressed 4.6 to 5.0 V
B208-92 (VG) - B208-91 (E2G) V - R Mass air flow meter sub-assembly signal Idling, shift lever in P or N (neutral), A/C off 0.5 to 3.0 V
B208-94 (THA) - B208-93 (ETHA) L - W 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
B208-97 (THEO) - B208-96 (ETHE) Y - V Engine oil temperature sensor signal Idling with warm engine 0 to 5.0 V
B208-98 (PEO) - B208-129 (EPEO) W - R Oil pressure sender gauge assembly signal Idling with warm engine 0.5 to 4.5 V
B208-99 (OX1B) - B208-100 (EX1B) L - Y Heated oxygen sensor signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 16)
B208-101 (IGF1) - B208-53 (E1) B - W-B Ignition coil assembly (ignition confirmation signal) Idling with warm engine

Pulse generation

(See waveform 11)
B208-103 (PR) - B208-135 (EPR) W - R Fuel pressure sensor signal Idling with warm engine 0.5 to 4.5 V
B208-104 (THW) - B208-105 (ETHW) B - BR Engine coolant temperature sensor signal Idling, engine coolant temperature 75 to 100°C (167 to 212°F) 0.2 to 1.0 V
B208-106 (PIM) - B208-137 (EPIM) V - R No. 2 turbo pressure sensor signal Idling with warm engine 1.0 to 4.5 V
B208-107 (THIM) - B208-53 (E1) B - W-B Intake air temperature sensor (No. 2 turbo pressure sensor) signal Idling with warm engine 0 to 5.0 V
B208-108 (PTA) - B208-139 (EPTA) L - LG No. 1 turbo pressure sensor signal Idling with warm engine 1.0 to 4.5 V
B208-110 (VCNE) - B208-53 (E1) L - W-B Power source of crankshaft position sensor (specific voltage) Engine stopped, ignition switch ON 4.5 to 5.5 V
B208-111 (VCE1) - B208-53 (E1) W - W-B Power source of camshaft position sensor (for exhaust camshaft) (specific voltage) Engine stopped, ignition switch ON 4.5 to 5.5 V
B208-113 (VCV1) - B208-53 (E1) W - W-B Power source of camshaft position sensor (for intake camshaft) (specific voltage) Engine stopped, ignition switch ON 4.5 to 5.5 V
B208-121 (VCTA) - B208-120 (ETA) L - L Power source of throttle position sensor (specific voltage) Engine stopped, ignition switch ON 4.5 to 5.5 V
B208-122 (VTA1) - B208-120 (ETA) LG - L Throttle position sensor signal (for engine control) Ignition switch ON, accelerator pedal fully released 0.6 to 1.1 V
Engine running, accelerator pedal fully depressed 3.2 to 4.8 V
B208-124 (KNK1) - B208-123 (EKNK) B - W Knock control sensor signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 17)
B208-130 (VCPE) - B208-53 (E1) P - W-B Power source of oil pressure sender gauge assembly (specific voltage) Engine stopped, ignition switch ON 4.75 to 5.25 V
B208-131 (A1A+) - B208-53 (E1) Y - W-B Air fuel ratio sensor signal Engine stopped, ignition switch ON 3.0 to 3.6 V*4
B208-132 (A1A-) - B208-53 (E1) L - W-B Air fuel ratio sensor signal Engine stopped, ignition switch ON 2.7 to 3.3 V*4
B208-136 (VCPR) - B208-53 (E1) G - W-B Power source of fuel pressure sensor (specific voltage) Engine stopped, ignition switch ON 4.5 to 5.5 V
B208-138 (VCPM) - B208-53 (E1) G - W-B Power source of No. 2 turbo pressure sensor (specific voltage) Engine stopped, ignition switch ON 4.75 to 5.25 V
B208-140 (VPTA) - B208-53 (E1) GR - W-B Power source of No. 1 turbo pressure sensor (specific voltage) Engine stopped, ignition switch ON 4.75 to 5.25 V


  1. WAVEFORM 1

    A0030VME01
    *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, ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  2. WAVEFORM 2

    A0030VVE01
    *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, ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  3. WAVEFORM 3

    A0030LBE05
    *a 2 V/DIV.
    *b 2 ms./DIV.
    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.

  4. WAVEFORM 4

    A002ZWWE04
    *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

    A00311KE11
    *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

    A002ZP4E05
    *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 Ignition switch ON, A/C switch on (max cool)

    Tech Tips

    The duty ratio varies depending on the engine coolant temperature.

  7. WAVEFORM 7

    A00314KE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Cam Timing Oil Control Solenoid Assembly (for Intake Camshaft) Operation Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  8. WAVEFORM 8

    A002ZYYE20
    *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

    A00305GE04
    *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

    A00314KE02
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Cam Timing Oil Control Solenoid 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

    A0030Y4E12
    *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

    A002ZYUE22
    *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

    A0030MYE05
    *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.

  14. WAVEFORM 14

    A002ZXBE03
    *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.

  15. WAVEFORM 15

    A0030AOE20
    *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.

  16. WAVEFORM 16

    A00312ME01
    *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.

  17. WAVEFORM 17

    A0030J6E01
    *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.