SFI SYSTEM (w/ Electronic Throttle Control System) TERMINALS OF ECM

A0136WIE01

Tech Tips

The standard normal 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 normal voltage for that pair of the terminals, 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
B26-22 (BATT) - B26-1 (E1) LG - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
B26-4 (IGSW) - B26-1 (E1) R - W-B Ignition switch Ignition switch ON 11 to 14 V
B26-24 (+B) - B26-1 (E1) P - W-B Power source of ECM Ignition switch ON 11 to 14 V
B26-23 (+B1) - B26-1 (E1) Y - W-B Power source of ECM Ignition switch ON 11 to 14 V
B26-35 (MREL) - B26-1 (E1) GR - W-B EFI main relay Ignition switch ON Below 1.5 V
B25-57 (VC) - B25-35 (ETA) Y - BR*1, P*2 Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B26-11 (VCPA) - B26-10 (EPA) B - LG Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
B26-19 (VCP2) - B26-18(EPA2) W - BR*1, V*2 Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
B25-56 (VC2) - B25-53 (E21) R - BR Power source of manifold absolute pressure sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B25-80 (VCG1) - B26-1 (E1) BE or O - W-B Power source of camshaft position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B25-52 (PIM) - B25-53 (E21) Y - BR Manifold absolute pressure sensor Idling 1.2 to 2.0 V
B25-14 (VTA1) - B25-35 (ETA) GR - BR*1, P*2

Throttle position sensor 1

(for engine control)

 Ignition switch ON, Accelerator pedal fully released 0.2 to 1.0 V
Ignition switch ON, Accelerator pedal fully depressed 4.2 to 4.8 V
B25-15 (VTA2) - B25-35 (ETA) R - BR *1, P *2

Throttle position sensor 2

(for engine control)

 Ignition switch ON, Accelerator pedal fully released with warm engine 4.0 to 4.8 V
Ignition switch ON, Accelerator pedal fully depressed 0.2 to 1.0 V
B26-9 (VPA) - B26-10 (EPA) R - LG

Accelerator pedal position sensor 1

(for engine control)

 Ignition switch ON, Accelerator pedal fully released 0.7 to 1.2 V
Ignition switch ON, Accelerator pedal fully depressed 2.8 to 4.6 V
B26-17 (VPA2) - B26-18 (EPA2) L - BR*1, V*2

Accelerator pedal position sensor 2

(for engine control)

 Ignition switch ON, Accelerator pedal fully released 1.2 to 2.0 V
Ignition switch ON, Accelerator pedal fully depressed 3.6 to 4.6 V
B25-13 (THA) - B25-53 (E21) W -BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 1.5 to 3.0 V
B25-12 (THW) - B25-30 (E2) R - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V

B25-47 (#1) - B26-21 (E01)

B25-48 (#2) - B26-21 (E01)

B25-67 (#3) - B26-21 (E01)

W - W-B

B - W-B

R - W-B

 Injector Ignition switch ON 11 to 14 V

B25-39 (IGT1) - B26-1 (E1)

B25-40 (IGT2) - B26-1 (E1)

B25-21 (IGT3) - B26-1 (E1)

G - W-B

B - W-B

BE or O - W-B

 Ignition coil with igniter (ignition signal) Idling

Pulse generation

(See waveform 1)
B25-59 (G1) - B25-60 (G-) P - W-B Camshaft position sensor Idle after engine warmed-up

Pulse generation

(See waveform 2)
B25-6 (NE+) - B25-5 (NE-) P - L Crankshaft position sensor Idle after engine warmed-up

Pulse generation

(See waveform 2)
B26-40 (STA) - B26-1 (E1) L*1, GR*3 - W-B Starter signal Cranking 5.5 V or more
B26-26 (FC) - B26-1 (E1) G - W-B Fuel pump control Ignition switch ON 11 to 14 V
B25-34 (OX1A) - B25-32 (E11) W - B Heated oxygen sensor (Sensor 1) Maintain engine speed at 2500 rpm for 2 minutes after warming up sensor

Pulse generation

(See waveform 3)
B25-36 (OX1B) - B25-37 (E12) Y - BR Heated oxygen sensor (Sensor 2) Maintain engine speed at 2500 rpm for 2 minutes after warming up sensor

Pulse generation

(See waveform 4)
B25-2 (HT1A) - B26-1 (E1) L - W-B Heated oxygen sensor heater Ignition switch ON 11 to 14 V
B25-41 (HT1B) - B26-1 (E1) R - W-B Heated oxygen sensor heater Ignition switch ON 11 to 14 V
B25-17 (KNK1) - B25-18 (KNK2) G - R Knock sensor Maintain engine speed at 4000 rpm after warming up engine

Pulse generation

(See waveform 5)
B25-42 (OCV-) - B26-1 (E1) G - W-B Camshaft timing oil control valve Idling

Pulse generation

(See waveform 6)
B25-22 (EVP1) - B26-1 (E1) V - W-B EVAP VSV Ignition switch ON 11 to 14 V
B26-31 (STP) - B26-1 (E1) G - W-B Stop light switch Brake pedal depressed 11 to 14 V
Brake pedal released Below 1.5 V
B26-7 (ST1-) - B26-1 (E1) Y - W-B Stop light switch Brake pedal depressed Below 1.5 V
Brake pedal released 11 to 14 V
B26-5 (W) - B26-1 (E1) BE or O - W-B MIL

Ignition switch ON

(MIL goes on)

 Below 3.0 V
B26-38 (SPD) - B26-1 (E1) Y - W-B Speed signal from skid control ECU Ignition switch ON, Rotate driving wheel slowly Pulse generation
B26-2 (M+) - B26-3 (M-) B - W Throttle actuator Idling with warm engine

Pulse generation

(See waveform 7)
B26-13 (TACH) - B26-1 (E1) P - W-B Engine speed signal Idling

Pulse generation

(See waveform 8)
B25-61 (SIL) - B26-1 (E1) GR - W-B Terminal SIL of DLC3 Connect intelligent tester to DLC3 Pulse generation
B26-30 (TC) - B26-1 (E1) P - W-B Mode signal switch Ignition switch ON 9 to 14 V
B26-8 (ELS) - B26-1 (E1) B - W-B Taillight switch Taillight ON 11 to 14 V
B26-28 (CAN+) - B26-36 (CAN-) B - W CAN communication Ignition switch ON

Pulse generation

(See waveform 9)
B25-8 (D) - B26-1 (E1) P - W-B Clutch switch Ignition switch ON, Clutch pedal depressed Below 1.5 V
Ignition switch ON, Clutch pedal released 11 to 14 V

*1 : w/ MMT

*2 : w/ VSC

*3 : for Manual transaxle models


  1. WAVEFORM 1

    A01393WE02
    Igniter IGT Signal (from ECM to Igniter)
    ECM Terminal Name Between IGT1 (to IGT3) and E1
    Tester Range 2 v/DIV, 100 ms/DIV
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as engine rpm increases.

  2. WAVEFORM 2

    A01375DE10
    Camshaft Position Sensor, Crankshaft Position Sensor
    ECM Terminal Name

    (a) Between G1 and G-

    (b) Between NE+ and NE-
    Tester Range 5 v/DIV, 20 ms/DIV
    Condition Idle after engine warmed-up

    Tech Tips


    • The wavelength becomes shorter as engine rpm increases.

  3. WAVEFORM 3

    A0138XEE24
    Heated Oxygen Sensor (Sensor 1)
    ECM Terminal Name Between OX1A and E11
    Tester Range 0.2 v/DIV, 200 ms/DIV
    Condition Maintain engine RPM at 2500 rpm after engine warmed-up

    Tech Tips

    In the Data List, the items O2S B1 S1 show the ECM input values of the HO2S (sensor 1).

  4. WAVEFORM 4

    A0136TTE28
    Heated Oxygen Sensor (Sensor 2)
    ECM Terminal Name Between OX1B and E12
    Tester Range 0.2 v/DIV, 200 ms/DIV
    Condition Maintain engine rpm at 2500 rpm after engine warmed-up

    Tech Tips

    In the Data List, the items O2S B1 S2 show the ECM input values of the HO2S (sensor 2).

  5. WAVEFORM 5

    A0136EGE01
    Knock Sensor
    ECM Terminal Name Between KNK1 and KNK2
    Tester Range 1 v/DIV, 1 ms/DIV
    Condition Maintain engine rpm 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.

  6. WAVEFORM 6

    A0135XZE35
    VVT OCV
    ECM Terminal Name Between OCV- and E1
    Tester Range 5 v/DIV, 1 ms/DIV
    Condition Idling

  7. WAVEFORM 7

    A0136NBE02
    Throttle Actuator Positive Terminal
    ECM Terminal Name Between M+ and M-
    Tester Range 20 v/DIV, 500 μs/DIV
    Condition Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  8. WAVEFORM 8

    A0138TUE26
    Engine Revolution Signal
    ECM Terminal Name Between TACH and E1
    Tester Range 5 v/DIV, 10 ms/DIV
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine rpm increases.

  9. WAVEFORM 9

    A0138DZE01
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CAN+ and CAN-
    Tester Range 1 v/DIV, 50 μs/DIV
    Condition Ignition switch ON

    Tech Tips

    The waveform varies depending on the CAN communication signal.