SFI SYSTEM(w/o EGR System) TERMINALS OF ECM

A01H8DJN07

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
A35-1 (BATT) - C48-16 (E1) V - BR Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) Power switch off 11 to 16 V
A35-2 (+B) - C48-16 (E1) L - BR Power source of ECM Power switch on (IG) 11 to 14 V
A35-3 (+B2) - C48-16 (E1) L - BR Power source of ECM Power switch on (IG) 11 to 14 V
C48-29 (+BM) - C48-16 (E1) GR - BR Power source of throttle actuator Power switch off 11 to 16 V
A35-46 (MREL) - C48-16 (E1) P - BR EFI-MAIN relay operation signal Power switch on (IG) 11 to 14 V
C48-113 (VCV1) - C48-16 (E1) W - BR Power source for camshaft position sensor (specific voltage) Power switch on (IG) 4.5 to 5.5 V
A35-37 (IGSW) - C48-16 (E1) B - BR Power switch signal Power switch on (IG) 11 to 14 V
C48-125 (VCTA) - C48-126 (ETA) Y - L Power source for throttle position sensor (specific voltage) Power switch on (IG) 4.5 to 5.5 V
C48-127 (VTA1) - C48-126 (ETA) G - L Throttle position sensor signal (for engine control) Power switch on (IG), accelerator pedal fully released 0.5 to 1.1 V
C48-128 (VTA2) - C48-126 (ETA) R - L Throttle position sensor signal (for sensor malfunction detection) Power switch on (IG), accelerator pedal fully released 2.1 to 3.1 V
C48-20 (#10) - C48-50 (E01) L - W-B No. 1 fuel injector assembly signal Power switch on (IG) 11 to 14 V
Idling with warm engine

Pulse generation

(see waveform 1)
C48-17 (#20) - C48-50 (E01) G - W-B No. 2 fuel injector assembly signal Power switch on (IG) 11 to 14 V
Idling with warm engine

Pulse generation

(see waveform 1)
C48-18 (#30) - C48-50 (E01) B - W-B No. 3 fuel injector assembly signal Power switch on (IG) 11 to 14 V
Idling with warm engine

Pulse generation

(see waveform 1)
C48-19 (#40) - C48-50 (E01) W - W-B No. 4 fuel injector assembly signal Power switch on (IG) 11 to 14 V
Idling with warm engine

Pulse generation

(see waveform 1)
C48-74 (OC1+) - C48-75 (OC1-) B - V Camshaft timing oil control valve assembly operation signal Idling

Pulse generation

(see waveform 2)
C48-82 (VV1+) - C48-114 (VV1-) B - R Camshaft position sensor signal Idling with warm engine

Pulse generation

(see waveform 15)
C48-76 (NE+) - C48-109 (NE-) W - B Crankshaft position sensor signal Idling with warm engine

Pulse generation

(see waveform 3)
C48-60 (M+) - C48-58 (ME01) V - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(see waveform 5)
C48-30 (M-) - C48-58 (ME01) P - W-B Throttle actuator operation signal (negative terminal) Idling with warm engine

Pulse generation

(see waveform 6)
C48-57 (IGT1) - C48-16 (E1) R - BR No. 1 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(see waveform 7)
C48-56 (IGT2) - C48-16 (E1) B - BR No. 2 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(see waveform 7)
C48-55 (IGT3) - C48-16 (E1) G - BR No. 3 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(see waveform 7)
C48-54 (IGT4) - C48-16 (E1) L - BR No. 4 ignition coil assembly (ignition signal) Idling with warm engine

Pulse generation

(see waveform 7)
C48-51 (IGF1) - C48-16 (E1) W - BR Ignition coil assembly (ignition confirmation signal) Power switch on (IG) 4.5 to 5.5 V
Idling with warm engine

Pulse generation

(see waveform 7)
C48-95 (THW) - C48-96 (ETHW) GR - P Engine coolant temperature sensor signal Idling, engine coolant temperature 60 to 120°C (140 to 248°F) 0.2 to 1.0 V
C48-93 (THA) - C48-94 (ETHA) B - V Intake air temperature sensor signal Idling, intake air temperature 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
C48-91 (VG) - C48-92 (E2G) Y - L Mass air flow meter sub-assembly signal Idling, shift lever in P or N, A/C switch off 0.5 to 3.0 V
C48-68 (PRG) - C48-16 (E1) V - BR Purge VSV for EVAP system operation signal Power switch on (IG) 11 to 14 V
Idling with warm engine, under purge control

Pulse generation

(see waveform 8)
C48-133 (A1A+) - C48-16 (E1) L - BR Air fuel ratio sensor (sensor 1) signal Power switch on (IG) 3.3 V*
C48-134 (A1A-) - C48-16 (E1) Y - BR Air fuel ratio sensor (sensor 1) signal Power switch on (IG) 2.9 V*
C48-23 (HA1A) - C48-53 (E04) W - BR Air fuel ratio sensor (sensor 1) heater operation signal Idling

Pulse generation

(see waveform 9)
Power switch on (IG) 11 to 14 V
C48-100 (OX1B) - C48-132 (EX1B) L - Y Heated oxygen sensor (sensor 2) signal Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(see waveform 10)
C48-24 (HT1B) - C48-53 (E04) R - BR Heated oxygen sensor (sensor 2) heater operation signal Idling Below 3.0 V
Power switch on (IG) 11 to 14 V
C48-123 (KNK1) - C48-124 (EKNK) R - G Knock control sensor signal Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(see waveform 11)
A35-13 (CANH) - C48-16 (E1) Y - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 12)
A35-26 (CANL) - C48-16 (E1) W - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 13)
A35-12 (CANP) - C48-16 (E1) R - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 12)
A35-25 (CANN) - C48-16 (E1) W - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 13)
A35-44 (RFC) - C48-16 (E1) B - BR Cooling fan control signal Power switch on (IG), A/C switch on (max cool)

Pulse generation

(see waveform 14)
A35-60 (G2O) - C48-16 (E1) B - BR Inverter with converter assembly (camshaft revolution signal) Idling with warm engine

Pulse generation

(see waveform 4)
C48-59 (GE01) - C48-16 (E1) B - BR Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
A35-21 (FPC) - C48-16 (E1) R - BR Fuel pump control Engine stopped, power switch on (IG) Below 1.5 V
C48-78 (VCPM) - C48-80 (EPIM) L - G Power source of absolute pressure sensor Power switch on (IG) 4.75 to 5.25 V
C48-79 (PIM) - C48-80 (EPIM) V - G Manifold absolute pressure sensor signal Power switch on (IG) 3.0 to 5.0 V
A35-31 (TACH) - C48-16 (E1) GR - BR Engine speed Idling with warm engine

Pulse generation

(see waveform 16)
A35-9 (PWMS) - C48-16 (E1) GR - BR Driving mode select switch (SPORT mode) Power switch on (IG), driving mode select switch being turned and held at SPORT position (SPORT mode) 0 to 1.5 V
Power switch on (IG) 11 to 14 V
A35-43 (SPCN) - C48-16 (E1) L - BR Driving mode select switch (NORMAL mode) Power switch on (IG), driving mode select switch being pushed and held (NORMAL mode) 0 to 1.5 V
Power switch on (IG) 11 to 14 V
A35-14 (EC) - Body ground BR - - Ground Always Below 1 Ω
C48-16 (E1) - Body ground BR - - Ground Always Below 1 Ω
C48-50 (E01) - Body ground W-B - - Ground Always Below 1 Ω
C48-49 (E02) - Body ground W-B - - Ground Always Below 1 Ω
C48-53 (E04) - Body ground BR - - Ground Always Below 1 Ω
C48-58 (ME01) - Body ground W-B - - Ground Always Below 1 Ω

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


  1. WAVEFORM 1

    A01H7AEE01
    *1 20 V/DIV.
    *2 20 ms./DIV.
    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.

  2. WAVEFORM 2

    A01H6JKE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly Operation Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  3. WAVEFORM 3

    A00006NE03
    *a 5 V/DIV.
    *b 20 ms/DIV.
    Crankshaft Position Sensor Signal
    ECM Terminal Name Between NE+ and NE-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  4. WAVEFORM 4

    A01H76ZE01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Camshaft Revolution Signal (Inverter with Converter Assembly)
    ECM Terminal Name Between GO2 and E1
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  5. WAVEFORM 5

    A01H7L2E03
    *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.

  6. WAVEFORM 6

    A01H5NVE01
    *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.

  7. WAVEFORM 7

    A01H6YDE06
    *a 2 V/DIV.
    *b 20 ms/DIV.
    Ignition Coil Assembly Signal (IGT and IGF1 Signal)
    ECM Terminal Name

    Between IGT (1 to 4) and E1

    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.

  8. WAVEFORM 8

    A01H7Z7E01
    *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.

  9. WAVEFORM 9

    A01H7O7E01
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Air Fuel Ratio Sensor (Sensor 1) Heater Operation Signal
    ECM Terminal Name Between HA1A and E04
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling

  10. WAVEFORM 10

    A01H6A5E01
    *1 0.2 V/DIV.
    *2 200 ms./DIV.
    Heated Oxygen Sensor (Sensor 2) 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, item O2S B1S2 shows the ECM values from the heated oxygen sensor.

  11. WAVEFORM 11

    A01H5M6E06
    *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 2500 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.

  12. WAVEFORM 12

    A01H83BE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANH and E1, or CANP and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  13. WAVEFORM 13

    A01H6COE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANL and E1, or CANN and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  14. WAVEFORM 14

    A01H66HE06
    *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 Power switch on (IG), A/C switch on (max cool)

    Tech Tips

    The duty ratio varies depending on the engine coolant temperature.

  15. WAVEFORM 15

    A01H7CIE02
    *a 5 V/DIV.
    *b 20 ms/DIV.
    Camshaft Position Sensor Signal
    ECM Terminal Name Between VV1+ and VV1-
    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

    A01H6T5E01
    *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

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.