SFI SYSTEM (w/o Secondary Air Injection System) TERMINALS OF ECM

A01BHVVE46

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, displayed in the STD Voltages column. The illustration above can be used as a reference to identify the ECM terminal locations.

Terminal No. (Symbols) Wiring Colors Terminal Descriptions Conditions STD Voltages
B71-20 (BATT) - D97-105 (E1) W - W-B Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
B71-3 (+BM) - D97-105 (E1) Y - W-B Power source of throttle actuator Always 11 to 14 V
B71-27 (IGSW) - D97-105 (E1) B - W-B Ignition switch Ignition switch ON 11 to 14 V
B71-2 (+B) - D97-105 (E1) L - W-B Power source of ECM Ignition switch ON 11 to 14 V
B71-44 (MREL) - D97-105 (E1) G - W-B EFI relay Ignition switch ON 11 to 14 V
D97-119 (VC) - D97-72 (E2) L - Y

Power source of sensor

(specific voltage)

 Ignition switch ON 4.5 to 5.0 V
D97-113 (VTA1) - D97-72 (E2) R - Y

Throttle position sensor

(for engine control)

 Ignition switch ON, Accelerator pedal fully released 0.5 to 1.1 V
Ignition switch ON, Accelerator pedal fully depressed 3.3 to 4.9 V
D97-112 (VTA2) - D97-72 (E2) G - Y

Throttle position sensor

(for sensor malfunction detection)

 Ignition switch ON, Accelerator pedal fully released 2.1 to 3.1 V
Ignition switch ON, Accelerator pedal fully depressed 4.5 to 5.0 V
B71-55 (VPA) - B71-59 (EPA) L - G

Accelerator pedal position sensor

(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
B71-56 (VPA2) - B71-60 (EPA2) B - GR

Accelerator pedal position sensor

(for sensor malfunction detection)

 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
B71-57 (VCPA) - B71-59 (EPA) W - G

Power source of accelerator pedal position sensor

(for VPA)

 Ignition switch ON 4.5 to 5.5 V
B71-58 (VCP2) - B71-60 (EPA2) R - GR

Power source of accelerator pedal position sensor

(for VPA2)

 Ignition switch ON 4.5 to 5.5 V
D97-69 (VG) - D97-92 (E2G) Y-G - L Mass air flow meter Idling, Shift lever in neutral, A/C switch OFF 0.5 to 3.0 V
D97-87 (THA) - D97-72 (E2) R - Y Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
D97-64 (THW) - D97-72 (E2) R-W - Y Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
D97-66 (RTHW) - D97-72 (E2) L - Y Engine coolant temperature (radiator) sensor Idling, radiator side engine coolant temperature -20 to 80°C (-4 to 176°F) 0.5 to 4.5 V
D97-86 (#10) - D97-46 (E01) B - W-B Fuel injector Ignition switch ON 11 to 14 V
D97-85 (#20) - D97-46 (E01) L - W-B
D97-84 (#30) - D97-46 (E01) Y - W-B Idling

Pulse generation

(see waveform 1)
D97-83 (#40) - D97-46 (E01) R - W-B
D97-109 (IGT1) - D97-105 (E1) R-L - W-B

Ignition coil with igniter

(ignition coil signal)

 Idling

Pulse generation

(see waveform 2)
D97-108 (IGT2) - D97-105 (E1) L-W - W-B
D97-107 (IGT3) - D97-105 (E1) B-Y - W-B
D97-106 (IGT4) - D97-105 (E1) Y-R - W-B
D97-82 (IGF1) - D97-105 (E1) W-R - W-B

Ignition coil with igniter

(ignition confirmation signal)

 Ignition switch ON 4.5 to 5.0 V
Idling

Pulse generation

(see waveform 2)
D97-94 (G2) - D97-118 (G2-) Y - L Camshaft position sensor Idling

Pulse generation

(see waveform 3)
D97-93 (NE+) - D97-117 (NE-) W - B Crankshaft position sensor Idling

Pulse generation

(see waveform 3)
B71-19 (FC) - D97-105 (E1) L - W-B Fuel pump control Ignition switch ON 11 to 14 V
Idling Below 1.5 V
D97-43 (M+) - D97-44 (ME01) Y - W-B Throttle actuator Idling with warm engine

Pulse generation

(see waveform 4)
D97-42 (M-) - D97-44 (ME01) L - W-B Throttle actuator Idling with warm engine

Pulse generation

(see waveform 5)
D97-103 (A1A+) - D97-72 (E2) B - Y Heated oxygen sensor Engine speed maintained 2500 rpm for 2 minutes after warming up sensor

Pulse generation

(see waveform 6)
D97-104 (HA1A) - D97-81 (E03) Y - W-B Heated oxygen sensor heater Idling Below 3.0 V
Ignition switch ON 11 to 14 V
D97-110 (KNK1) - D97-111 (EKNK) G - R Knock sensor Maintain engine speed 4000 rpm after warming up

Pulse generation

(see waveform 7)
D97-74 (OC1+) - D97-96 (OC1-) G - B Camshaft timing oil control valve (OCV) Idling

Pulse generation

(see waveform 8)
D97-62 (PRG) - D97-105 (E1) B - W-B EVAP VSV Ignition switch ON 11 to 14 V
Idling

Pulse generation

(see waveform 9)
B71-48 (STA) - D97-105 (E1) R - W-B Starter signal Shift lever in neutral, ignition switch START 5.5 V or more
B71-36 (STP) - D97-105 (E1) Y - W-B Stop light switch Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
B71-35 (ST1-) - D97-105 (E1) R - W-B Stop light switch Ignition switch ON, Brake pedal depressed Below 1.5 V
Ignition switch ON, Brake pedal released 7.5 to 14 V
B71-31 (ELS) - D97-105 (E1) G - W-B Electric load Taillight ON 7.5 to 14 V
Taillight OFF 0 to 1.5 V
B71-50 (ELS2) - D97-105 (E1) B - W-B Electric load Defogger ON 7.5 to 14 V
Defogger OFF 0 to 1.5 V
B71-15 (TACH) - D97-105 (E1) B - W-B Engine speed Idling

Pulse generation

(see waveform 10)
B71-38 (SPD) - D97-105 (E1) P - W-B Speed signal from combination meter Driving at 20 km/h (12 mph)

Pulse generation

(see waveform 11)
B71-41 (TC) - D97-105 (E1) G - W-B Terminal TC of DLC3 Ignition switch ON 11 to 14 V
B71-52 (PSW) - D97-105 (E1) G - W-B Power steering oil pressure switch While turning steering wheel Below 1.5 V
B71-46 (F/PS) - D97-105 (E1) B - W-B Airbag sensor assembly Idling with warm engine

Pulse generation

(see waveform 12)
B71-8 (CANH) - D97-105 (E1) B - W-B Communication signal with other components Ignition switch ON

Pulse generation

(see waveform 13)
B71-9 (CANL) - D97-105 (E1) W - W-B Communication signal with other components Ignition switch ON

Pulse generation

(see waveform 14)
D97-80 (OX1B) - D97-72 (E2) B - Y Variable resistor Ignition switch ON 0 to 5.5 V

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


  1. WAVEFORM 1


    1. A01BADUE03

      Fuel injector

      ECM Terminal Names Between #1 (to #4) and E01
      Tester Ranges 20 V/DIV, 20 msec./DIV
      Conditions Idling

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

  2. WAVEFORM 2


    1. A01BE0XE05

      Igniter IGT signal (from ECM to igniter)

    2. Igniter IGF signal (from igniter to ECM)

      ECM Terminal Names

      1. Between IGT (1 to 4) and E1

      2. Between IGF1 and E1
      Tester Ranges 2 V/DIV, 20 msec./DIV
      Conditions Idling

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

  3. WAVEFORM 3


    1. A01BBQZE01

      Camshaft position sensor

    2. Crankshaft position sensor

      ECM Terminal Names

      1. Between G2 and NE-

      2. Between NE+ and NE-
      Tester Ranges 5 V/DIV, 20 msec./DIV
      Conditions Idling

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

  4. WAVEFORM 4


    1. A01BB4DE06

      Throttle actuator positive terminal

      ECM Terminal Names Between M+ and ME01
      Tester Ranges 5 V/DIV, 1 msec./DIV
      Conditions Idling with warm engine

      Tech Tips

      The duty ratio varies depending on the throttle actuator operation.

  5. WAVEFORM 5


    1. A01BHLLE04

      Throttle actuator negative terminal

      ECM Terminal Names Between M- and ME01
      Tester Ranges 5 V/DIV, 1 msec./DIV
      Conditions Idling with warm engine

      Tech Tips

      The duty ratio varies depending on the throttle actuator operation.

  6. WAVEFORM 6


    1. A01BI0GE17

      Heated oxygen sensor

      ECM Terminal Names Between A1A+ and E2
      Tester Ranges 0.2 V/DIV, 200 msec./DIV
      Conditions Engine speed maintained 2500 rpm for 2 minutes after warming up engine

      Tech Tips

      In the DATA LIST, item O2S B1S1 shows the ECM input values from the heated oxygen sensor.

  7. WAVEFORM 7


    1. A01BC7DE02

      Knock sensor

      ECM Terminal Names Between KNK1 and EKNK
      Tester Ranges 1 V/DIV, 1 msec./DIV
      Conditions Engine speed maintained 4000 rpm after warming up engine

      Tech Tips


      • The wavelength becomes shorter as the engine rpm increases.

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

  8. WAVEFORM 8


    1. A01BAZJE03

      Camshaft timing oil control valve (OCV)

      ECM Terminal Names Between OC1+ and OC1-
      Tester Ranges 5 V/DIV, 1 msec./DIV
      Conditions Idling

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

  9. WAVEFORM 9


    1. A01BFCSE02

      EVAP VSV

      ECM Terminal Names Between PRG and E01
      Tester Ranges 10 V/DIV, 20 msec./DIV
      Conditions Idling

      Tech Tips

      If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

  10. WAVEFORM 10


    1. A01BET2E02

      Engine speed signal

      ECM Terminal Names Between TACH and E1
      Tester Ranges 5 V/DIV, 10 msec./DIV
      Conditions Idling

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

  11. WAVEFORM 11


    1. A01BHHLE03

      Vehicle speed signal

      ECM Terminal Names Between SPD and E1
      Tester Ranges 5 V/DIV, 20 msec./DIV
      Conditions Driving at 20 km/h (12 mph)

      Tech Tips

      The wavelength becomes shorter as the vehicle speed increases.

  12. WAVEFORM 12


    1. A01BGPOE01

      Airbag sensor assembly

      ECM Terminal Names Between F/PS and E1
      Tester Ranges 5 V/DIV, 500 msec./DIV
      Conditions Idling with warm engine

  13. WAVEFORM 13


    1. A01BGNTE02

      CAN communication signal

      ECM Terminal Names Between CANH and E1
      Tester Ranges 1 V/DIV, 10 μs/DIV
      Conditions Ignition switch ON

  14. WAVEFORM 14


    1. A01BFXTE02

      CAN communication signal

      ECM Terminal Names Between CANL and E1
      Tester Ranges 1 V/DIV, 10 μs/DIV
      Conditions Ignition switch ON