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

A01BDQ0E06

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.

Symbols (Terminal No.) Wiring Colors Terminal Descriptions Conditions STD Voltages
BATT (B9-3) - E1 (D1-3) B-R - BR Battery (for measuring the battery voltage and for the ECM memory) Always 9 to 14 V
+BM (B9-7) - E1 (D1-3) Y-B - BR Power source of throttle motor Always 9 to 14 V
IGSW (B9-9) - E1 (D1-3) B-R - BR Ignition switch Ignition switch to the ON position 9 to 14 V
+B (B9-1) - E1 (D1-3) B-R - BR Power source of ECM Ignition switch to the ON position 9 to 14 V
MREL (B9-8) - E1 (D1-3) G-Y - BR EFI relay Ignition switch to the ON position 9 to 14 V
VC (D1-18) - E2 (D1-28) L-B - Y-R

Power source of sensor

(specific voltage)

 Ignition switch to the ON position 4.5 to 5.0 V
VTA1 (D1-20) - E2 (D1-28) R - Y-R

Throttle position sensor

(for engine control)

 Ignition switch to the ON position, Accelerator pedal fully released 0.5 to 1.1 V
VTA1 (D1-20) - E2 (D1-28) R - Y-R

Throttle position sensor

(for engine control)

 Ignition switch to the ON position, Accelerator pedal fully depressed 3.3 to 4.9 V
VTA2 (D1-19) - E2 (D1-28) G - Y-R

Throttle position sensor

(for sensor malfunction detection)

 Ignition switch to the ON position, Accelerator pedal fully released 2.1 to 3.1 V
VTA2 (D1-19) - E2 (D1-28) G - Y-R

Throttle position sensor

(for sensor malfunction detection)

 Ignition switch to the ON position, Accelerator pedal fully depressed 4.5 to 5.0 V
VPA (B9-18) - EPA (B9-20) L - W-L

Accelerator pedal position sensor

(for engine control)

 Ignition switch to the ON position, Accelerator pedal fully released 0.5 to 1.1 V
VPA (B9-18) - EPA (B9-20) L - W-L

Accelerator pedal position sensor

(for engine control)

 Ignition switch to the ON position, Accelerator pedal fully depressed 2.6 to 4.5 V
VPA2 (B9-19) - EPA2 (B9-21) B - W-R

Accelerator pedal position sensor

(for sensor malfunction detection)

 Ignition switch to the ON position, Accelerator pedal fully released 1.2 to 2.0 V
VPA2 (B9-19) - EPA2 (B9-21) B - W-R

Accelerator pedal position sensor

(for sensor malfunction detection)

 Ignition switch to the ON position, Accelerator pedal fully depressed 3.4 to 5.0 V
VCPA (B9-26) - EPA (B9-20) W - W-L

Power source of accelerator pedal position sensor

(for VPA)

 Ignition switch to the ON position 4.5 to 5.0 V
VCP2 (B9-27) - EPA2 (B9-21) R-L - W-R

Power source of accelerator pedal position sensor

(for VPA2)

 Ignition switch to the ON position 4.5 to 5.0 V
VG (D3-28) - E2G (D3-30) Y-G - L-R Mass air flow meter Idling, Shift position P or N, A/C switch OFF 0.5 to 3.0 V
THA (D3-29) - E2 (D1-28) R - Y-R Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
THW (D1-32) - E2 (D1-28) R-W - Y-R Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V

#1 (D3-6) - E01 (D1-7)

#2 (D3-5) - E01 (D1-7)

#3 (D3-2) - E01 (D1-7)

#4 (D3-1) - E01 (D1-7)

B - W-B

B-W - W-B

Y - W-B

R - W-B

 Injector Ignition switch to the ON position 9 to 14 V

#1 (D3-6) - E01 (D1-7)

#2 (D3-5) - E01 (D1-7)

#3 (D3-2) - E01 (D1-7)

#4 (D3-1) - E01 (D1-7)

B - W-B

B-W - W-B

Y - W-B

R - W-B

 Injector Idling

Pulse generation

(see waveform 1)

IGT1 (D1-17) - E1 (D1-3)

IGT2 (D1-16) - E1 (D1-3)

IGT3 (D1-15) - E1 (D1-3)

IGT4 (D1-14) - E1 (D1-3)

R-L - BR

L-W - BR

B-Y - BR

Y-R - BR

Ignition coil with igniter

(ignition coil signal)

 Idling

Pulse generation

(see waveform 2)
IGF1 (D1-23) - E1 (D1-3) W-R - BR

Ignition coil with igniter

(ignition confirmation signal)

 Ignition switch to the ON position 4.5 to 5.0 V
IGF1 (D1-23) - E1 (D1-3) W-R - BR

Ignition coil with igniter

(ignition confirmation signal)

 Idling

Pulse generation

(see waveform 2)
G2 (D1-26) - NE- (D1-34) Y - B Camshaft position sensor Idling

Pulse generation

(see waveform 3)
NE+ (D1-27) - NE- (D1-34) Y - B Crankshaft position sensor Idling

Pulse generation

(see waveform 3)
FC (B9-25) - E1 (D1-3) L-Y - BR Fuel pump control Ignition switch to the ON position 9 to 14 V
FC (B9-25) - E1 (D1-3) L-Y - BR Fuel pump control Idling Below 1.5 V
M+ (D1-5) - ME01 (D3-3) Y - BR Throttle actuator Idling with warm engine

Pulse generation

(see waveform 4)
M- (D1-4) - ME01 (D3-3) L - BR Throttle actuator Idling with warm engine

Pulse generation

(see waveform 5)
OX1A (D1-21) - E2 (D1-28) B - Y-R Heated oxygen sensor Engine speed maintained 2,500 rpm for 2 minutes after warming up sensor

Pulse generation

(see waveform 6)
HT1A (D1-1) - E03 (D3-4) Y - BR Heated oxygen sensor heater Idling Below 3.0 V
HT1A (D1-1) - E03 (D3-4) Y - BR Heated oxygen sensor heater Ignition switch to the ON position 9 to 14 V
KNK1 (D1-29) - EKNK (D1-30) G - R Knock sensor Maintain engine speed 4,000 rpm after warming up

Pulse generation

(see waveform 7)
OC1+ (D1-13) - OC1- (D1-12) G-B - B-Y Camshaft timing oil control valve (OCV) Idling

Pulse generation

(see waveform 8)
PRG (D3-23) - E01 (D1-7) B - W-B EVAP VSV Ignition switch to the ON position 9 to 14 V
PRG (D3-23) - E01 (D1-7) B - W-B EVAP VSV Idling

Pulse generation

(see waveform 9)
STA (B9-12) - E1 (D1-3) R - BR Starter signal Shift position N, ignition switch START 5.5 V or more
STP (B7-4) - E1 (D1-3) R-W - BR Stop light switch Brake pedal depressed 7.5 to 14 V
STP (B7-4) - E1 (D1-3) R-W - BR Stop light switch Brake pedal released Below 1.5 V
ST1- (B9-16) - E1 (D1-3) R-L - BR Stop light switch Ignition switch to the ON position, Brake pedal depressed Below 1.5 V
ST1- (B9-16) - E1 (D1-3) R-L - BR Stop light switch Ignition switch to the ON position, Brake pedal released 7.5 to 14 V
W (B7-30) - E01 (D1-7) G-R - W-B MIL Idling 9 to 14 V
W (B7-30) - E01 (D1-7) G-R - W-B MIL Ignition switch to the ON position Below 3.5 V
ELS (B9-15) - E1 (D1-3) G - BR Electric load Tail light switch ON 7.5 to 14 V
ELS (B9-15) - E1 (D1-3) G - BR Electric load Tail light switch OFF 0 to 1.5 V
TACH (B7-1) - E1 (D1-3) B-Y - BR Engine speed Idling

Pulse generation

(see waveform 10)
SPD (B7-8) - E1 (D1-3) P-L - BR Speed signal from combination meter Driving at 20 km/h (12 mph)

Pulse generation

(see waveform 11)
TC (B7-17) - E1 (D1-3) P - BR Terminal TC of DLC 3 Ignition switch to the ON position 9 to 14 V
PSW (D3-32) - E1 (D1-3) G-W - BR Power steering oil pressure switch While turning steering wheel Below 1.5 V
F/PS (B7-32) - E1 (D1-3) L - BR Airbag sensor assembly Idling with warm engine

Pulse generation

(see waveform 12)
NSW (B9-30) - E1 (D1-3) B-W - BR Park/Neutral switch signal IG switch ON and shift lever in P or N position Below 1 V
NSW (B9-30) - E1 (D1-3) B-W - BR Park/Neutral switch signal IG switch ON and shift lever in any position except P and N 9 to 14 V
CANH (B7-33) - E1 (D1-3) B - BR Communication signal with other components Ignition switch to the ON position

Pulse generation

(see waveform 13)
CANL (B7-34) - E1 (D1-3) W - BR Communication signal with other components Ignition switch to the ON position

Pulse generation

(see waveform 14)

*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. A01BAEIE04

      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. A01BDMRE04

      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. A01BCBQE06

      Heated oxygen sensor

      ECM Terminal Names Between OX1A and E2
      Tester Ranges 0.2 V/DIV, 200 msec./DIV
      Conditions Engine speed maintained 2,500 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


    1. A01BAGLE07

      Knock sensor

      ECM Terminal Names Between KNK1 and EKNK
      Tester Ranges 0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
      Conditions Engine speed maintained 4,000 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. A01BG8UE02

      EVAP VSV

      ECM Terminal Names Between PRG and E01
      Tester Ranges 5 V/DIV, 50 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, 10μs/DIV
      Conditions Ignition switch to the ON position

  14. WAVEFORM 14


    1. A01BFXTE02

      CAN communication signal

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