SFI SYSTEM TERMINALS OF ECM

A00XIBWE01

Tech Tips

The standard voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard 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
G59-17 (BATT) - C64-5 (E1) L - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
G59-22 (+BM) - C64-5 (E1) GR - BR Power source of throttle actuator Always 11 to 14 V
G60-22 (IGSW) - C64-5 (E1) W - BR Ignition switch Ignition switch ON 11 to 14 V
G59-23 (+B) - C64-5 (E1) W - BR Power source of ECM Ignition switch ON 11 to 14 V
G60-12 (MREL) - C64-5 (E1) V - BR EFI relay Ignition switch ON 11 to 14 V
C61-10 (VCTA) - C62-16 (E2) B - W-R Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
C61-3 (VTA1) - C61-9 (ETA) LG - W Throttle position sensor (for engine control) Ignition switch ON, accelerator pedal fully released 0.5 to 1.1 V
C61-3 (VTA1) - C61-9 (ETA) LG - W Throttle position sensor (for engine control) Ignition switch ON, accelerator pedal fully depressed 3.2 to 4.8 V
C61-4 (VTA2) - C61-9 (ETA) G-W - W Throttle position sensor (for sensor malfunction detection) Ignition switch ON, accelerator pedal fully released 2.1 to 3.1 V
C61-4 (VTA2) - C61-9 (ETA) G-W - W Throttle position sensor (for sensor malfunction detection) Ignition switch ON, accelerator pedal fully depressed 4.6 to 5.0 V
G60-6 (VPA) - G60-2 (EPA) L - P Accelerator pedal position sensor (for engine control) Ignition switch ON, accelerator pedal fully released 0.5 to 1.1 V
G60-6 (VPA) - G60-2 (EPA) L - P Accelerator pedal position sensor (for engine control) Ignition switch ON, accelerator pedal fully depressed 2.6 to 4.5 V
G60-5 (VPA2) - G60-1 (EPA2) GR - W Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, accelerator pedal fully released 1.2 to 2.0 V
G60-5 (VPA2) - G60-1 (EPA2) GR - W Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, accelerator pedal fully depressed 3.4 to 4.75 V
G60-4 (VCPA) - C64-5 (E1) LG - BR Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
G60-3 (VCP2) - C64-5 (E1) R - BR Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
C61-13 (VG) - C61-7 (E2G) W-R - B-W Mass air flow meter Idling, shift lever in P or N (for A/T) or neutral (for M/T), A/C switch off 0.5 to 3.0 V
C61-12 (THA) - C61-11 (ETHA) Y-B - W-R Intake air temperature sensor Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
C61-18 (THW) - C61-17 (ETHW) R-L - L-B Engine coolant temperature sensor Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
C64-6 (#10) - C64-11 (E01) L - W-B Fuel injector assembly Ignition switch ON 11 to 14 V
C64-7 (#20) - C64-11 (E01) G - W-B Fuel injector assembly Ignition switch ON 11 to 14 V
C64-8 (#30) - C64-11 (E01) R - W-B Fuel injector assembly Ignition switch ON 11 to 14 V
C64-9 (#40) - C64-11 (E01) W - W-B Fuel injector assembly Ignition switch ON 11 to 14 V
C64-6 (#10) - C64-11 (E01) L - W-B Fuel injector assembly Idling

Pulse generation

(See waveform 1)
C64-7 (#20) - C64-11 (E01) G - W-B Fuel injector assembly Idling

Pulse generation

(See waveform 1)
C64-8 (#30) - C64-11 (E01) R - W-B Fuel injector assembly Idling

Pulse generation

(See waveform 1)
C64-9 (#40) - C64-11 (E01) W - W-B Fuel injector assembly Idling

Pulse generation

(See waveform 1)
C64-1 (IGT1) - C64-5 (E1) R-Y - BR

Ignition coil assembly

(ignition signal)

 Idling

Pulse generation

(See waveform 2)
C64-2 (IGT2) - C64-5 (E1) R-L - BR

Ignition coil assembly

(ignition signal)

 Idling

Pulse generation

(See waveform 2)
C64-3 (IGT3) - C64-5 (E1) G-B - BR

Ignition coil assembly

(ignition signal)

 Idling

Pulse generation

(See waveform 2)
C64-4 (IGT4) - C64-5 (E1) G-W - BR

Ignition coil assembly

(ignition signal)

 Idling

Pulse generation

(See waveform 2)
C64-10 (IGF1) - C64-5 (E1) G-R - BR

Ignition coil assembly

(ignition confirmation signal)

 Ignition switch ON 4.5 to 5.0 V
C64-10 (IGF1) - C64-5 (E1) G-R - BR

Ignition coil assembly

(ignition confirmation signal)

 Idling

Pulse generation

(See waveform 2)
C62-11 (G2) - C62-5 (NE-) W - B Camshaft position sensor Idling

Pulse generation

(See waveform 3)
C62-12 (NE+) - C62-5 (NE-) W - B Crankshaft position sensor Idling

Pulse generation

(See waveform 3)
G60-25 (FC) - C64-5 (E1) G - BR Fuel pump control Ignition switch ON 11 to 14 V
G60-25 (FC) - C64-5 (E1) G - BR Fuel pump control Idling Below 1.5 V
C64-14 (M+) - C64-13 (ME01) P - W-B Throttle actuator Idling with warm engine

Pulse generation

(See waveform 4)
C64-15 (M-) - C64-13 (ME01) L - W-B Throttle actuator Idling with warm engine

Pulse generation

(See waveform 5)
C63-7 (A1A+) - C64-5 (E1) P - BR Air fuel ratio sensor Ignition switch ON 3.3 V*1
C63-1 (A1A-) - C64-5 (E1) L - BR Air fuel ratio sensor Ignition switch ON 3.0 V*1
C63-13 (OX1B) - C62-16 (E2) B - W-R Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

Pulse generation

(See waveform 6)
C63-6 (HA1A) - C63-23 (E04) R-L - BR Air fuel ratio sensor Idling

Pulse generation

(See waveform 7)
C63-6 (HA1A) - C63-23 (E04) R-L - BR Air fuel ratio sensor Ignition switch ON 11 to 14 V
C63-18 (HT1B) - C63-14 (EX1B) L-R - L-W Heated oxygen sensor heater Idling Below 3.0 V
C63-18 (HT1B) - C63-14 (EX1B) L-R - L-W Heated oxygen sensor heater Ignition switch ON 11 to 14 V
C61-6 (KNK1) - C61-5 (EKNK) B - W Knock sensor Maintain Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 8)
C62-14 (OC1+) - C62-9 (OC1-) G-Y - L-B Camshaft timing oil control valve assembly Idling

Pulse generation

(See waveform 9)
C63-19 (PRG) - C64-5 (E1) P - BR Purge VSV Ignition switch ON 11 to 14 V
C63-19 (PRG) - C64-5 (E1) P - BR Purge VSV Idling

Pulse generation

(See waveform 10)
G60-8 (STA) - C64-5 (E1) W - BR Starter signal Shift lever in N (for A/T) or neutral (M/T), ignition switch START 5.5 V or higher
G60-18 (STP) - C64-5 (E1) V - BR Stop light switch Brake pedal depressed 7.5 to 14 V
G60-18 (STP) - C64-5 (E1) V - BR Stop light switch Brake pedal released Below 1.5 V
G59-8 (ST1-) - C64-5 (E1) B - BR Stop light switch Ignition switch ON, brake pedal depressed Below 1.5 V
G59-8 (ST1-) - C64-5 (E1) B - BR Stop light switch Ignition switch ON, brake pedal released 7.5 to 14 V
G59-13 (W) - C64-5 (E1) V - BR MIL Idling 11 to 14 V
G59-13 (W) - C64-5 (E1) V - BR MIL Ignition switch ON Below 3.5 V
G60-29 (TACH) - C64-5 (E1) P - BR Engine speed Idling

Pulse generation

(See waveform 11)
G60-16 (SPD) - C64-5 (E1) R - BR Speed signal from combination meter Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 12)
G60-13 (TC) - C64-5 (E1) V - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
G59-3 (PSW) - C64-5 (E1) G - BR Power steering oil pressure switch Steering wheel turning Below 1.5 V
G60-24 (NSW) - C64-5 (E1)*2 B - BR Park/Neutral switch signal Ignition switch ON and shift lever in P or N Below 1 V
G60-24 (NSW) - C64-5 (E1)*2 B - BR Park/Neutral switch signal Ignition switch ON and shift lever not in P or N 11 to 14 V
G60-34 (CANH) - C64-5 (E1) LG - BR Signal for communication with other components Ignition switch ON

Pulse generation

(See waveform 13)
G60-33 (CANL) - C64-5 (E1) W - BR Signal for communication with other components Ignition switch ON

Pulse generation

(See waveform 14)
C62-6 (VC) - C61-7 (E2G) W-R - B-W Power source of air pressure sensor Ignition switch ON 4.5 to 5.5 V
G59-1 (AIP) - C61-7 (E2G) L - B-W Secondary air injection system pressure signal Ignition switch ON 3.0 to 3.6 V
G59-6 (AIRV) - C64-5 (E1) P - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
G59-19 (AIRP) - C64-5 (E1) GR - BR Air pump control Ignition switch ON 11 to 14 V
G60-30 (AIDI) - C64-5 (E1) G - BR Diagnostic information signal for secondary air injection system Secondary air injection system operating

Pulse generation

(See waveform 15)

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

*2: for Automatic Transmission


  1. WAVEFORM 1

    A00XCFZE28

    Fuel injector

    ECM Terminal Name Between #10 (to 40) and E01
    Tester Range 20 V/DIV., 20 msec./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  2. WAVEFORM 2

    A00XHOCE40

    1. Igniter IGT signal (from ECM to igniter)

    2. Igniter IGF signal (from igniter to ECM)

      ECM Terminal Name

      (a) Between IGT (1 to 4) and E1

      (b) Between IGF1 and E1
      Tester Range 2 V/DIV., 20 msec./DIV.
      Condition Idling

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

  3. WAVEFORM 3

    A00XGF8E38

    1. Camshaft position sensor

    2. Crankshaft position sensor

      ECM Terminal Name

      (a) Between G2 and NE-

      (b) Between NE+ and NE-
      Tester Range 5 V/DIV., 20 msec./DIV.
      Condition Idling

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

  4. WAVEFORM 4

    A00XKAYE06

    Throttle actuator positive terminal

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

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  5. WAVEFORM 5

    A00XDB0E04

    Throttle actuator negative terminal

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

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  6. WAVEFORM 6

    A00XFQIE42

    Heated oxygen sensor

    ECM Terminal Name Between OX1B and E2
    Tester Range 0.2 V/DIV., 200 msec./DIV.
    Condition Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    Tech Tips

    In the DATA LIST, item O2S B1S2 shows the ECM input values from the heated oxygen sensor.

  7. WAVEFORM 7

    A00XG14E10

    Air fuel ratio sensor heater

    ECM Terminal Name Between HA1A and E04
    Tester Range 5 V/DIV., 10 msec./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength varies in accordance with the engine operating condition.

  8. WAVEFORM 8

    A00XCXHE75

    Knock sensor

    ECM Terminal Name Between KNK1 and EKNK
    Tester Range 1 V/DIV., 1 msec./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.

  9. WAVEFORM 9

    A00XGZHE44

    Camshaft timing oil control valve

    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 msec./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  10. WAVEFORM 10

    A00XKAPE02

    Purge VSV

    ECM Terminal Name Between PRG and E01
    Tester Range 10 V/DIV., 20 msec./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

    A00XC8ZE38

    Engine speed signal

    ECM Terminal Name Between TACH and E1
    Tester Range 5 V/DIV., 10 msec./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  12. WAVEFORM 12

    A00XIUGE31

    Vehicle speed signal

    ECM Terminal Name Between SPD and E1
    Tester Range 5 V/DIV., 20 msec./DIV.
    Condition Driving at 20 km/h (12 mph)

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  13. WAVEFORM 13

    A00XD1TE53

    CAN communication signal (reference)

    ECM Terminal Name Between CANH and E1
    Tester Range 1 V/DIV., 10 μs/DIV.
    Condition Ignition switch ON

  14. WAVEFORM 14

    A00XJ3RE50

    CAN communication signal (reference)

    ECM Terminal Name Between CANL and E1
    Tester Range 1 V/DIV., 10 μs/DIV.
    Condition Ignition switch ON

  15. WAVEFORM 15

    A00XI55E01

    Terminal DI of air injection control driver

    ECM Terminal Name Between AIDI and E1
    Tester Range 5 V/DIV., 50 msec./DIV.
    Condition Performing Active Test using intelligent tester (secondary air injection system)

    Tech Tips

    The wavelength changes when the air injection control driver detects malfunctions in the secondary air injection system.