SFI SYSTEM TERMINALS OF ECM

A01VKPME01

Tech Tips

The standard normal 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 normal voltage for that pair of 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
A71-22 (BATT) - A71-1 (E1) V - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A71-4 (IGSW) - A71-1 (E1) R - W-B Ignition switch Ignition switch ON 11 to 14 V
A71-24 (+B) - A71-1 (E1) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A71-23 (+B2) - A71-1 (E1) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A71-35 (MREL) - A71-1 (E1) GR - W-B EFI MAIN relay Ignition switch ON 11 to 14 V
B87-55 (VCTA) - B87-35 (ETA) L - R Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
A71-11 (VCPA) - A71-10 (EPA) G - G Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A71-19 (VCP2) - A71-18 (EPA2) W - B Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
B87-54 (VCPM) - B87-51 (EPIM) V - G Power source of manifold absolute pressure sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B87-80 (VC) - A71-1 (E1) LG - W-B Power source of camshaft position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B87-50 (PIM) - B87-51 (EPIM) B - G Manifold absolute pressure sensor Idling 1.2 to 2.0 V
B87-14 (VTA1) - B87-35 (ETA) Y - R Throttle position sensor (for engine control) Ignition switch ON, Accelerator pedal released 0.2 to 1.0 V
Ignition switch ON, Accelerator pedal fully depressed 4.2 to 4.6 V
B87-15 (VTA2) - B87-35 (ETA) GR - R Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal released 4.0 to 4.8 V
Ignition switch ON, Accelerator pedal fully depressed 0.2 to 1.0 V
A71-9 (VPA) - A71-10 (EPA) R - G Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal released 0.7 to 1.2 V
Ignition switch ON, Accelerator pedal fully depressed 2.8 to 4.6 V
A71-17 (VPA2) - A71-18 (EPA2) L - B Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal released 1.2 to 2.0 V
Ignition switch ON, Accelerator pedal fully depressed 3.6 to 4.6 V
B87-13 (THA) - B87-51 (EPIM) P - G Intake air temperature sensor (built into manifold absolute pressure sensor) Idling, Intake air temperature 20°C (68°F) 1.5 to 3.0 V
B87-12 (THW) - B87-30 (ETHW) R - P Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V

B87-45 (#10) - A71-21 (E01)

B87-46 (#20) - A71-21 (E01)

B87-67 (#30) - A71-21 (E01)

R - W-B

GR - W-B

P - W-B

 Fuel injector assembly Ignition switch ON 11 to 14 V

B87-39 (IGT1) - A71-1 (E1)

B87-40 (IGT2) - A71-1 (E1)

B87-21 (IGT3) - A71-1 (E1)

W - W-B

BE - W-B

G - W-B

 No. 1 ignition coil (ignition signal) Idling

Pulse generation

(See waveform 1)
B87-57 (G2+) - B87-58 (G2-) R - W Camshaft position sensor Idling with warm engine

Pulse generation

(See waveform 2)
B87-6 (NE+) - B87-5 (NE-) Y - BR Crankshaft position sensor Idling with warm engine

Pulse generation

(See waveform 2)
A71-40 (STA) - A71-1 (E1) BR - W-B Starter signal Ignition switch ON Below 1.5 V
Cranking 5.5 V or more
A71-25 (NSW) - A71-1 (E1) BE - W-B Clutch start switch signal

Ignition switch ON

(Clutch pedal fully depressed)

 Below 1.5 V

Ignition switch ON

(Clutch pedal released)

 11 to 14 V
A71-26 (FC) - A71-1(E1) V - W-B Fuel pump control Ignition switch ON 11 to 14 V
Idling Below 1.5 V
B87-34 (OX1A) - B87-32 (E2) W - BR Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

Pulse generation

(See waveform 3)
B87-36 (OX1B) - B87-37 (O1B-) P - L No. 2 heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

Pulse generation

(See waveform 4)
B87-2 (HT1A) - A71-1 (E1) G - W-B Heated oxygen sensor heater Ignition switch ON 11 to 14 V
B87-41 (HT1B) - A71-1 (E1) LG - W-B No. 2 heated oxygen sensor Ignition switch ON 11 to 14 V
B87-17 (KNK1) - B87-18 (EKNK) R - G Knock sensor Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 5)
B87-61 (OC1-) - B87-62 (OC1+) R - W Camshaft timing oil control valve assembly Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(See waveform 6)
B87-22 (EVP1) - A71-1 (E1) L - W-B Purge VSV Ignition switch ON 11 to 14 V
A71-31 (STP) - A71-1 (E1) LG - W-B Stop light switch assembly Brake pedal depressed 11 to 14 V
Brake pedal released Below 1.5 V
A71-7 (ST1-) - A71-1 (E1) Y- W-B Stop light switch assembly Brake pedal depressed Below 1.5 V
Brake pedal released 11 to 14 V
A71-5 (W) - A71-1 (E1) B - W-B MIL Ignition switch ON (MIL goes on) Below 3.0 V
A71-38 (SPD) - A71-1 (E1) V - W-B Speed signal from combination meter Vehicle speed of approximately 20 km/h (12 mph)

Pulse generation

(See waveform 7)
A71-2 (M+) - A71-3 (M-) G - R Throttle actuator Idling with warm engine

Pulse generation

(See waveform 8)
A71-16 (ELS2) - A71-1 (E1) G - W-B Electric load Taillight switch on 11 to 14 V
Taillight switch off Below 1.5 V
A71-13 (TACH) - A71-1 (E1) LG - W-B Engine speed Idling

Pulse generation

(See waveform 11)
A71-30 (TC) - A71-1 (E1) L - W-B Terminal TC of DLC3 Ignition switch ON 11 to 14 V

B87-42 (EGR1) - A71-1 (E1)

B87-64 (EGR2) - A71-1 (E1)

B87-63 (EGR3) - A71-1 (E1)

B87-43 (EGR4) - A71-1 (E1)

R - W-B

LG - W-B

W - W-B

Y - W-B

 EGR valve assembly Engine racing

Pulse generation

(See waveform 12)
B87-8 (D) - A71-1 (E1) L - W-B

No. 2 clutch start switch assembly

(upper)

Ignition switch ON

Clutch pedal released

 11 to 14 V

Ignition switch ON

Clutch pedal depressed

 Below 1.5 V
B87-25 (R) - A71-1(E1) R - W-B Back-up light switch assembly signal Back-up light switch on 11 to 14 V
A71-34 (FANL) - A71-1 (E1) R - W-B FAN NO. 1 relay

Ignition switch ON

Cooling fan not operated

 11 to 14 V

Idling with A/C on or High engine coolant temperature

Cooling fan operated

 Below 1.5 V
A71-33 (FANH) - A71-1 (E1) G - W-B FAN NO. 2 relay

Idling with high engine coolant temperature

Cooling fan operated at high speed

 Below 1.5 V
A71-28 (CANH) - A71-1 (E1) L - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 9)
A71-36 (CANL) - A71-1 (E1) W - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 10)
A71-29 (CANP)- A71-1 (E1) B - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 9)
A71-37 (CANN)- A71-1 (E1) W - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 10)
A71-15 (NEO)*1 - A71-1 (E1) V - W-B Crankshaft position sensor signal Idling with warm engine

Pulse generation

(See waveform 13)


  1. WAVEFORM 1

    A01VJ9XE07
    *a 2 V/DIV
    *b 100 ms/DIV
    Igniter IGT signal (from ECM to igniter)
    Terminal No. (Symbol) Tool Setting Condition
    B87-39 (IGT1) - A71-1 (E1) 2 V/DIV, 100 ms/DIV Idling
    B87-40 (IGT2) - A71-1 (E1) 2 V/DIV, 100 ms/DIV Idling
    B87-21 (IGT3) - A71-1 (E1) 2 V/DIV, 100 ms/DIV Idling

    Tech Tips

    The wavelength becomes shorter as engine rpm increases.

  2. WAVEFORM 2

    A01VLDCE23
    Camshaft position sensor and Crankshaft position sensor
    Terminal No. (Symbol) Tool Setting Condition
    (a) B87-57 (G2+) - B87-58 (G2-) 5 V/DIV, 20 ms/DIV Idling with warm engine
    (b) B87-6 (NE+) - B87-5 (NE-) 5 V/DIV, 20 ms/DIV Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as engine rpm increases.

  3. WAVEFORM 3

    A01VFI2E02
    *1 200 mV/DIV
    *2 200 ms/DIV
    Heated oxygen sensor
    Terminal No. (Symbol) Tool Setting Condition
    B87-34 (OX1A) - B87-32 (E2) 200 mV/DIV, 200 ms/DIV Engine RPM maintained at 2500 rpm after engine warmed up

    Tech Tips

    In the Data List, the item O2S B1S1 shows the ECM input values of the heated oxygen sensor.

  4. WAVEFORM 4

    A01VJT4E02
    *1 200 mV/DIV
    *2 200 ms/DIV
    No. 2 heated oxygen sensor
    Terminal No. (Symbol) Tool Setting Condition
    B87-36 (OX1B) - B87-37 (O1B-) 200 mV/DIV, 200 ms/DIV Engine RPM maintained at 2500 rpm after engine warmed up

    Tech Tips

    In the Data List, the item O2S B1S2 shows the ECM input values of the No. 2 heated oxygen sensor.

  5. WAVEFORM 5

    A01VHSSE11
    *a 1 V/DIV
    *b 1 ms/DIV
    Knock sensor
    Terminal No. (Symbol) Tool Setting Condition
    B87-17 (KNK1) - B87-18 (EKNK) 1 V/DIV, 1 ms/DIV Engine RPM maintained at 4000 rpm after engine warmed up

    Tech Tips


    • The wavelength becomes shorter as engine rpm increases.

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

  6. WAVEFORM 6

    A01VHSNE02
    *a 5 V/DIV
    *b 1 ms/DIV
    Camshaft Timing Oil Control Valve
    Terminal No. (Symbol) Tool Setting Condition
    B87-61 (OC1-) - B87-62 (OC1+) 5 V/DIV, 1 ms/DIV Engine RPM maintained at 2500 rpm after warming up engine

  7. WAVEFORM 7

    A01VDPBE03
    *a 5 V/DIV
    *b 20 ms/DIV
    Vehicle Speed Signal
    Terminal No. (Symbol) Tool Setting Condition
    A71-38 (SPD) - A71-1 (E1) 5 V/DIV, 20 ms/DIV Vehicle speed of approximately 20 km/h (12 mph)

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  8. WAVEFORM 8

    A01VHRFE06
    *1 20 V/DIV
    *2 500 μs/DIV
    Throttle actuator
    Terminal No. (Symbol) Tool Setting Condition
    A71-2 (M+) - A71-3 (M-) 20 V/DIV, 500 μs/DIV Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  9. WAVEFORM 9

    A01VDPFE06
    *a 1 V/DIV
    *b 10 μs/DIV
    CAN Communication signal (Reference)
    Terminal No. (Symbol) Tool Setting Condition
    A71-28 (CANH) - A71-1 (E1) 1 V/DIV, 10 μs/DIV Ignition switch ON
    A71-29 (CANP) - A71-1 (E1) 1 V/DIV, 10 μs/DIV Ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  10. WAVEFORM 10

    A01VJAKE06
    *a 1 V/DIV
    *b 10 μs/DIV
    CAN Communication signal (Reference)
    Terminal No. (Symbol) Tool Setting Condition
    A71-36 (CANL) - A71-1 (E1) 1 V/DIV, 10 μ/DIV Ignition switch ON
    A71-37 (CANN)- A71-1 (E1) 1 V/DIV, 10 μs/DIV Ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  11. WAVEFORM 11

    A01VI46E02
    *a 5 V/DIV
    *b 10 ms/DIV
    Engine speed signal
    Terminal No. (Symbol) Tool Setting Condition
    A71-13 (TACH) - A71-1 (E1) 5 V/DIV, 10 ms/DIV Idling

    Tech Tips

    The wavelength becomes shorter as engine rpm increases.

  12. WAVEFORM 12

    A01VKSQE02
    *1 10 V/DIV
    *2 500 μs/DIV
    EGR valve assembly
    Terminal No. (Symbol) Tool Setting Condition
    B87-42 (EGR1) - A71-1 (E1) 10 V/DIV, 500 μs/DIV Engine racing
    B87-64 (EGR2) - A71-1 (E1) 10 V/DIV, 500 μs/DIV Engine racing
    B87-63 (EGR3) - A71-1 (E1) 10 V/DIV, 500 μs/DIV Engine racing
    B87-43 (EGR4) - A71-1 (E1) 10 V/DIV, 500 μs/DIV Engine racing

  13. WAVEFORM 13

    A01VGMEE01
    *a 1 V/DIV
    *b 2 ms/DIV
    Crankshaft Position Sensor Signal
    Terminal No. (Symbol) Tool Setting Condition
    A71-15 (NEO) - A71-1 (E1) 1 V/DIV, 2 ms/DIV Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as engine rpm increases.