SFI SYSTEM TERMINALS OF ECM

A011A7IE01

Tech Tips

The standard 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 voltage for that pair of the terminals, and 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
A18-20 (BATT) - B8-105 (E1) B - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A18-2 (+B) - B8-105 (E1) W - BR Power source of ECM Ignition switch ON 11 to 14 V
A18-1 (+B2) - B8-105 (E1) L - BR Power source of ECM Ignition switch ON 11 to 14 V
A18-3 (+BM) - B8-105 (E1) R-W - BR Power source of throttle actuator Always 11 to 14 V
B8-109 (IGT1) - B8-105 (E1) W - BR

Ignition coil

(ignition signal)

Idling

Pulse generation

(see waveform 1)

B8-108 (IGT2) - B8-105 (E1) L - BR
B8-107 (IGT3) - B8-105 (E1) GR - BR
B8-106 (IGT4) - B8-105 (E1) P - BR
B8-82 (IGF1) - B8-105 (E1) Y - BR

Ignition coil

(ignition confirmation signal)

Ignition switch ON 4.5 to 5.5 V
Idling

Pulse generation

(see waveform 1)

B8-116 (VCNE) - B8-105 (E1) P - BR Power source of crankshaft position sensor Ignition switch ON 4.5 to 5.5 V
B8-93 (NE+) - B8-117 (NE-) L - V Crankshaft position sensor Idling with warm engine

Pulse generation

(see waveform 2)

B8-119 (VCV1) - B8-105 (E1) L - BR Power source for camshaft position sensor (for intake camshaft) Ignition switch ON 4.5 to 5.5 V
B8-121 (VCE1) - B8-105 (E1) G - BR Power source for camshaft position sensor (for exhaust camshaft) Ignition switch ON 4.5 to 5.5 V
B8-94 (G2+) - B8-118 (G2-) W - Y Camshaft position sensor (for intake camshaft) Idling with warm engine

Pulse generation

(see waveform 3)

B8-98 (EV1+) - B8-120 (EV1-) B - R Camshaft position sensor (for exhaust camshaft) Idling with warm engine

Pulse generation

(see waveform 3)

B8-86 (#10) - B8-46 (E01) LG - W-B Fuel injector Ignition switch ON 11 to 14 V
B8-85 (#20) - B8-46 (E01) P - W-B
B8-84 (#30) - B8-46 (E01) V - W-B Idling

Pulse generation

(see waveform 4)

B8-83 (#40) - B8-46 (E01) R - W-B
B8-104 (HA1A) - B8-41 (E04) B - W-B Air fuel ratio sensor (bank 1 sensor 1) heater Ignition switch ON 11 to 14 V
Idling with warm engine

Pulse generation

(see waveform 5)

B8-103 (A1A+) - B8-105 (E1) L - BR Air fuel ratio sensor (bank 1 sensor 1) Idling

Below 3.3 V*1

B8-126 (A1A-) - B8-105 (E1) G - BR Air fuel ratio sensor (bank 1 sensor 1) Idling

Below 2.9 V*1

B8-63 (HT1B) - B8-81 (E03) B - W-B Heated oxygen sensor (bank 1 sensor 2) heater Ignition switch ON 11 to 14 V
Idling Below 3.0 V
B8-80 (OX1B) - B8-79 (O1B-) G - R Heated oxygen sensor (bank 1 sensor 2) Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

Pulse generation

(see waveform 6)

B8-110 (KNK1) - B8-111 (EKNK) B - W Knock sensor Engine speed maintained at 4000 after warming up engine

Pulse generation

(see waveform 7)

A18-38 (SPD) - B8-105 (E1) R-B - BR Speed signal from combination meter Rotate driving wheel slowly

Pulse generation

(see waveform 8)

B8-64 (THW) - B8-65 (ETHW) LG - P Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
B8-87 (THA) - B8-88 (ETHA) W-L - LG-B Intake air temperature sensor (built into mass air flow meter) Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
B8-69 (VG) - B8-92 (E2G) B-W - L-W Mass air flow meter Idling, Shift lever position neutral, air conditioner OFF 0.5 to 3.0 V
B8-67 (VCPM) - B8-91 (EPIM) LG-R - G-R Power source of manifold absolute pressure sensor Ignition switch ON 4.5 to 5.5 V
B8-114 (PIM) - B8-91 (EPIM) L-Y - G-R Manifold absolute pressure sensor Idling 1.2 to 2.0 V
A18-24 (W) - B8-105 (E1) P-B - BR MIL Ignition switch ON (MIL goes on) Below 3.0 V
Idling 11 to 14 V
A18-48 (STA) - B8-105 (E1) W-R - BR Starter signal Ignition switch ON Below 1.5 V
Cranking 11 to 14 V
A18-25 (NSW) - B8-105 (E1) GR - BR

Clutch start switch signal*2

Park/Neutral position switch signal*3

Ignition switch ON, Clutch pedal fully depressed*2 Below 1.5 V
Ignition switch ON, Clutch pedal released*2 11 to 14 V
Ignition switch ON, shift lever in P, N*3 Below 1.5 V
Ignition switch ON, shift lever not in P, N*3 11 to 14 V
Cranking 11 to 14 V
B8-113 (VTA1) - B8-90 (ETA) W - B Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.1 V
Ignition switch ON, Throttle valve fully open 3.2 to 4.8 V
B8-112 (VTA2) - B8-90 (ETA) GR - B Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal released 2.1 to 3.1 V
Ignition switch ON, Accelerator pedal depressed 4.5 to 5.5 V
B8-89 (VCTA) - B8-90 (ETA) Y - B Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
A18-57 (VCPA) - A18-59 (EPA) G-R - LG Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A18-55 (VPA) - A18-59 (EPA) LG-R - LG Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal released 0.5 to 1.1 V
Ignition switch ON, Accelerator pedal fully depressed 2.5 to 4.5 V
A18-56 (VPA2) - A18-60 (EPA2) V-Y - V Accelerator pedal position sensor (for sensor malfunctioning detection) Ignition switch ON, Accelerator pedal released 1.2 to 2.0 V
Ignition switch ON, Accelerator pedal fully depressed 3.4 to 5.5 V
A18-58 (VCP2) - A18-60 (EPA2) L-W - V Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
B8-43 (M+) - B8-44 (ME01) G - BR Throttle actuator Idling with warm engine

Pulse generation

(see waveform 9)

B8-42 (M-) - B8-44 (ME01) R - BR Throttle actuator Idling with warm engine

Pulse generation

(see waveform 10)

A18-36 (STP) - B8-105 (E1) Y - BR Stop light switch Brake pedal depressed 11 to 14 V
Brake pedal released Below 1.5 V
A18-35 (ST1-) - B8-105 (E1) R-L - BR Stop light switch Ignition switch ON, Brake pedal depressed Below 1.5 V
Ignition switch ON, Brake pedal released 11 to 14 V
B8-62 (PRG) - B8-105 (E1) L-W - BR Purge valve Ignition switch ON 11 to 14 V
Idling, under purge control

Pulse generation

(see waveform 11)

A18-19 (FC) - B8-105 (E1) P - BR Fuel pump control Ignition switch ON 11 to 14 V
Idling Below 1.5 V
A18-15 (TACH) - B8-105 (E1) R-Y - BR Engine speed Idling

Pulse generation

(see waveform 12)

A18-41 (TC) - B8-105 (E1) R-G - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
B8-74 (OC1+) - B8-96 (OC1-) G - R-W Camshaft timing oil control valve (for intake camshaft) Idling

Pulse generation

(see waveform 13)

B8-75 (OE1+) - B8-97 (OE1-) L-R - P-L Camshaft timing oil control valve (for exhaust camshaft) Idling

Pulse generation

(see waveform 14)

A18-4 (CAN+) - B8-105 (E1) B-BR CAN communication Ignition switch ON

Pulse generation

(see waveform 15)

A18-5 (CAN-) - B8-105 (E1) W-BR CAN communication Ignition switch ON

Pulse generation

(see waveform 16)

A18-8 (CANH) - B8-105 (E1) L - BR CAN communication line Ignition switch ON

Pulse generation

(see waveform 15)

A18-9 (CANL) - B8-105 (E1) W - BR CAN communication line Ignition switch ON

Pulse generation

(see waveform 16)

B8-76 (R) - B8-105 (E1) R - BR Back-up light switch signal Back-up light switch on 11 to 14 V
B8-52 (ALT) - B8-105 (E1) B-L - BR Generator Ignition switch ON 11 to 14 V
B8-50 (EGR1) - B8-105 (E1) R-B - BR EGR valve Repeated quick engine rpm acceleration

Pulse generation

(see waveform 17)

B8-49 (EGR2) - B8-105 (E1) B-Y - BR
B8-48 (EGR3) - B8-105 (E1) W-G - BR
B8-47 (EGR4) - B8-105 (E1) B-R - BR
A18-39 (NEO)*2 - B8-105 (E1) V-W - BR Crankshaft position sensor signal Idling with warm engine

Pulse generation

(see waveform 18)

A18-21 (FANL) - B8-105 (E1) LG - BR NO. 1 FAN relay Ignition switch ON 11 to 14 V

Idling with A/C on

or

High engine coolant temperature

Below 1.5 V
A18-22 (FANH) - B8-105 (E1) G-R - BR NO. 2 FAN relay Idling with high engine coolant temperature Below 1.5 V
A18-27 (IGSW) - B8-105 (E1) G-W - BR Ignition switch Ignition switch ON 11 to 14 V
A18-44 (MREL) - B8-105 (E1) L-Y - BR EFI relay Ignition switch ON 11 to 14 V
A18-31 (ELS) - B8-105 (E1) L-R - BR Electric load Taillight switch on 7.5 to 14 V
Taillight switch off Below 1.5 V
A18-50 (ELS2) - B8-105 (E1) W-L - BR Electric load Defogger switch on 7.5 to 14 V
Defogger switch off Below 1.5 V


  1. WAVEFORM 1

    A0117S8E16
    Igniter IGT Signal (from ECM to Igniter)
    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

    Tech Tips

    The wavelength becomes shorter as the engine rpm increases.

  2. WAVEFORM 2

    A0119A7E01
    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 rpm increases.

  3. WAVEFORM 3

    A011A41E01
    Camshaft Position Sensor Signal
    ECM Terminal Name

    CH1: Between G2+ and G2-

    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 rpm increases.

  4. WAVEFORM 4

    A0119MUE24
    No. 1 (to No. 4) Injector Signal
    ECM Terminal Name Between #10 (to #40) and E01
    Tester Range 20 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine rpm increases.

  5. WAVEFORM 5

    A01184CE01
    Air Fuel Ratio Sensor (Bank 1 Sensor 1) Heater Signal
    ECM Terminal Name Between HA1A and E04
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength varies in accordance with the engine operating condition.

  6. WAVEFORM 6

    A01181JE15
    Heated Oxygen Sensor (Bank 1 Sensor 2) Signal
    ECM Terminal Name Between OX1B and O1B-
    Tester Range 0.2 V/DIV., 200 ms./DIV.
    Condition Maintain engine speed at 2500 rpm for 2 minutes after warming up sensor

    Tech Tips

    In the Data List, the item O2S B1S2 shows the values input to the ECM from the heated oxygen sensor.

  7. WAVEFORM 7

    A011B3WE67
    Knock Sensor Signal
    ECM Terminal Name Between KNK1 and EKNK
    Tester Range 500 mV/DIV., 1 ms./DIV.
    Condition Maintain engine speed at 4000 rpm after engine warmed-up

    Tech Tips


    • The wavelength becomes shorter as the engine rpm increases.

    • The waveforms and amplitudes displayed differ slightly depending on the vehicle condition.

  8. WAVEFORM 8

    A011AXFE29
    Vehicle Speed Signal
    ECM Terminal Name Between SPD and E1
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Rotate driving wheel slowly

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  9. WAVEFORM 9

    A011A9RE03
    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.

  10. WAVEFORM 10

    A011925E02
    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.

  11. WAVEFORM 11

    A011B12E01
    Purge Valve Signal
    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition Idling, 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.

  12. WAVEFORM 12

    A011A5HE33
    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 rpm increases.

  13. WAVEFORM 13

    A0117IGE38
    Camshaft Timing Oil Control Valve (for Intake Camshaft Signal)
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling
  14. WAVEFORM 14

    A0117IGE11
    Camshaft Timing Oil Control Valve Assembly for Exhaust Camshaft Signal
    ECM Terminal Name Between OE1+ and OE1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling
  15. WAVEFORM 15

    A0119N6E48
    CAN Communication Signal (Reference)
    ECM Terminal Name

    Between CAN+ and E1

    Between CANH and E1

    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  16. WAVEFORM 16

    A01177ZE44
    CAN Communication Signal (Reference)
    ECM Terminal Name

    Between CAN- and E1

    Between CANL and E1

    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  17. WAVEFORM 17

    A011B7HE02
    EGR Valve Signal
    ECM Terminal Name EGR1, EGR2, EGR3, EGR4 and E1
    Tester Range 20 V/DIV., 50 ms./DIV.
    Condition Repeated quick engine rpm acceleration
  18. WAVEFORM 18

    A0118I2E01
    Crankshaft Position Sensor Signal (for Stop and Start System)
    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 rpm increases.