SFI SYSTEM TERMINALS OF ECM

B001KOWE02

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, 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
A60-20 (BATT) - D27-104 (E1) R - BR Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) Always 11 to 16 V
A60-2 (+B) - D27-104 (E1) B - BR Power source of ECM Power switch on (IG) 11 to 14 V
A60-1 (+B2) - D27-104 (E1) B - BR Power source of ECM Power switch on (IG) 11 to 14 V
A60-3 (+BM) - D27-104 (E1) GR - BR Power source of throttle actuator Always 11 to 16 V
D27-108 (IGT1) - D27-104 (E1) P - BR

Ignition coil assembly

(ignition signal)

 Idling

Pulse generation

(see waveform 1)
D27-107 (IGT2) - D27-104 (E1) G - BR
D27-106 (IGT3) - D27-104 (E1) P - BR
D27-105 (IGT4) - D27-104 (E1) Y - BR
D27-23 (IGF1) - D27-104 (E1) L - BR

Ignition coil assembly

(ignition confirmation signal)

 Power switch on (IG) 4.5 to 5.5 V
Idling

Pulse generation

(see waveform 1)
D27-74 (NE+) - D27-120 (NE-) B - W Crankshaft position sensor Idling with warm engine

Pulse generation

(see waveform 2)
D27-76 (G2+) - D27-122 (G2-) B - W Camshaft position sensor Idling with warm engine

Pulse generation

(see waveform 3)
D27-85 (#10) - D27-109 (E01) Y - BR Fuel injector assembly Power switch on (IG) 11 to 14 V
D27-84 (#20) - D27-109 (E01) B - BR
D27-83 (#30) - D27-109 (E01) L - BR
D27-82 (#40) - D27-109 (E01) R - BR
D27-85 (#10) - D27-109 (E01) Y - BR Fuel injector assembly Idling

Pulse generation

(see waveform 4)
D27-84 (#20) - D27-109 (E01) B - BR
D27-83 (#30) - D27-109 (E01) L - BR
D27-82 (#40) - D27-109 (E01) R - BR
D27-18 (HA1A) - D27-46 (E04) G - BR Air fuel ratio sensor (sensor 1) heater Power switch on (IG) 11 to 14 V
Idling

Pulse generation

(see waveform 5)
D27-103 (A1A+) - D27-104 (E1) R - BR Air fuel ratio sensor (sensor 1) Idling

3.3 V*1
D27-126 (A1A-) - D27-104 (E1) G - BR Air fuel ratio sensor (sensor 1) Idling

3.0 V*1
D27-41 (HT1B) - D27-86 (E03) BR - BR Heated oxygen sensor (sensor 2) heater Power switch on (IG) 11 to 14 V
Idling Below 3.0 V
D27-125 (OX1B) - D27-102 (O1B-) L - P Heated oxygen sensor (sensor 2) Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(see waveform 6)
D27-87 (KNK1) - D27-110 (EKNK) B - W Knock control sensor Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(see waveform 7)
D27-64 (THW) - D27-65 (ETHW) P - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
D27-116 (THA) - D27-93 (ETHA) P - BR Intake air temperature sensor (built into mass air flow meter sub-assembly) Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
D27-94 (VG) - D27-117 (E2G) B - W Mass air flow meter sub-assembly Idling, shift lever in N, A/C switch off 0.5 to 3.0 V
A60-36 (W) - D27-104 (E1) LG - BR MIL Power switch on (IG) (MIL goes on) Below 3.0 V
Power switch on (READY) 11 to 14 V
D27-90 (VTA1) - D27-111 (ETA) Y - G Throttle position sensor (for engine control)

Accelerator pedal released

(Throttle valve fully closed)

 0.5 to 1.1 V
D27-89 (VTA2) - D27-111 (ETA) B - G Throttle position sensor (for sensor malfunction detection)

Accelerator pedal released

(Throttle valve fully closed)

 2.1 to 3.1 V
D27-88 (VCTA) - D27-111 (ETA) R - G Power source of throttle position sensor (specific voltage) Power switch on (IG) 4.5 to 5.5 V
D27-21 (M+) - D27-19 (ME01) L - BR Throttle actuator Idling with warm engine

Pulse generation

(see waveform 8)
D27-20 (M-) - D27-19 (ME01) P - BR Throttle actuator Idling with warm engine

Pulse generation

(see waveform 9)
D27-28 (PRG) - D27-104 (E1) V - BR Purge VSV Power switch on (IG) 11 to 14 V
Idling, under purge control

Pulse generation

(see waveform 10)
A60-8 (FC) - D27-104 (E1) R - BR Fuel pump control Power switch on (IG) 11 to 14 V
Idling Below 1.5 V
A60-7 (TC) - D27-104 (E1) P - BR Terminal TC of DLC3 Power switch on (IG) 11 to 14 V
A60-26 (TACH) - D27-104 (E1) B - BR Engine speed Idling

Pulse generation

(see waveform 11)
D27-36 (OC1+) - D27-59 (OC1-) G - Y Camshaft timing oil control valve assembly Idling

Pulse generation

(see waveform 12)
A60-13 (CANH) - D27-104 (E1) P - BR CAN communication line Engine stopped and power switch on (IG)

Pulse generation

(see waveform 13)
A60-5 (CANL) - D27-104 (E1) V - BR CAN communication line Engine stopped and power switch on (IG)

Pulse generation

(see waveform 14)
A60-12 (CANP) - D27-104 (E1) B - BR CAN communication line Engine stopped and power switch on (IG)

Pulse generation

(see waveform 13)
A60-4 (CANN) - D27-104 (E1) W - BR CAN communication line Engine stopped and power switch on (IG)

Pulse generation

(see waveform 14)
A60-28 (IGSW) - D27-104 (E1) W - BR Power switch Power switch on (IG) 11 to 14 V
A60-6 (MREL) - D27-104 (E1) G - BR EFI MAIN relay Power switch on (IG) 11 to 14 V
D27-99 (VCV1) - D27-104 (E1) R - BR Power source of camshaft position sensor Power switch on (IG) 4.5 to 5.5 V
A60-10 (WPO) - D27-104 (E1) L - BR Engine water pump assembly Idling with warm engine

Pulse generation

(see waveform 15)
A60-11 (WPI) - D27-104 (E1) G - BR Engine water pump assembly Idling with warm engine

Pulse generation

(see waveform 16)
D27-72 (VCPM) - D27-71 (EPIM) L - Y Manifold absolute pressure sensor Power switch on (IG) 4.5 to 5.5 V
D27-69 (PIM) - D27-71 (EPIM) B - Y Manifold absolute pressure sensor Power switch on (IG) 3.0 to 5.0 V
D27-48 (G2O) - D27-104 (E1) Y - BR Camshaft position signal Idling

Pulse generation

(see waveform 17)
A60-22 (FANH) - D27-104 (E1) LG - BR Cooling fan relay Power switch on (IG) 11 to 14 V
A60-21 (FANL) - D27-104 (E1) L - BR Cooling fan relay Power switch on (IG) 11 to 14 V
A60-46 (PWMS) - D27-104 (E1) G - BR Combination switch assembly (mode switch) Power switch on (IG), mode switch being turned and held at SPORT position 0 to 1.5 V
A60-30 (SPCN) - D27-104 (E1) L - BR Combination switch assembly (mode switch) Power switch on (IG), mode switch being pushed and held at NORMAL position 0 to 1.5 V
D27-104 (E1) - Body ground BR - Body ground Ground Always Below 1 Ω
D27-109 (E01) - Body ground BR - Body ground Ground Always Below 1 Ω
D27-81 (E02) - Body ground W-B - Body ground Ground Always Below 1 Ω
D27-86 (E03) - Body ground BR - Body ground Ground Always Below 1 Ω
D27-46 (E04) - Body ground BR - Body ground Ground Always Below 1 Ω
A60-32 (EC) - Body ground W-B - Body ground Ground Always Below 1 Ω
D27-22 (GE01) - D27-104 (E1) W-B - BR Shield earth (ground) circuit of throttle actuator Always Below 1 V

Tech Tips

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


  1. WAVEFORM 1

    B001NEVE10
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Ignition Coil IGT Signal (from ECM to Ignition Coil Assembly) and Ignition Coil IGF Signal (from Ignition Coil Assembly to ECM)
    Terminal No. (symbol) Tool Setting Condition
    D27-108 (IGT1) - D27-104 (E1) 2 V/DIV., 20 ms./DIV. Idling
    D27-107 (IGT2) - D27-104 (E1) 2 V/DIV., 20 ms./DIV. Idling
    D27-106 (IGT3) - D27-104 (E1) 2 V/DIV., 20 ms./DIV. Idling
    D27-105 (IGT4) - D27-104 (E1) 2 V/DIV., 20 ms./DIV. Idling
    D27-23 (IGF1) - D27-104 (E1) 2 V/DIV., 20 ms./DIV. Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  2. WAVEFORM 2

    B001KC2E01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Crankshaft Position Sensor Signal
    Terminal No. (symbol) Tool Setting Condition
    D27-74 (NE+) - D27-120 (NE-) 5 V/DIV., 20 ms./DIV. Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  3. WAVEFORM 3

    B001KGRE01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Camshaft Position Sensor Signal
    Terminal No. (symbol) Tool Setting Condition
    D27-76 (G2+) - D27-122 (G2-) 5 V/DIV., 20 ms./DIV. Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  4. WAVEFORM 4

    B001M4VE01
    *1 20 V/DIV.
    *2 20 ms./DIV.
    No. 1 (to No. 4) Fuel Injector Assembly Signal
    Terminal No. (symbol) Tool Setting Condition
    D27-85 (#10) - D27-109 (E01) 20 V/DIV., 20 ms./DIV. Idling
    D27-84 (#20) - D27-109 (E01) 20 V/DIV., 20 ms./DIV. Idling
    D27-83 (#30) - D27-109 (E01) 20 V/DIV., 20 ms./DIV. Idling
    D27-82 (#40) - D27-109 (E01) 20 V/DIV., 20 ms./DIV. Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  5. WAVEFORM 5

    B001MPME01
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Air Fuel Ratio Sensor (Sensor 1) Heater Signal
    Terminal No. (symbol) Tool Setting Condition
    D27-18 (HA1A) - D27-46 (E04) 5 V/DIV., 10 ms./DIV. Idling

  6. WAVEFORM 6

    B001MAFE02
    *1 0.2 V/DIV.
    *2 200 ms./DIV.
    Heated Oxygen Sensor (Sensor 2) Signal
    Terminal No. (symbol) Tool Setting Condition
    D27-125 (OX1B) - D27-102 (O1B-) 0.2 V/DIV., 200 ms./DIV. Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    Tech Tips

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

  7. WAVEFORM 7

    B001KXDE01
    *a 1 V/DIV.
    *b 1 ms./DIV.
    Knock Control Sensor Signal
    Terminal No. (symbol) Tool Setting Condition
    D27-87 (KNK1) - D27-110 (EKNK) 1 V/DIV., 1 ms./DIV. Engine speed maintained at 2500 rpm after warming up engine

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

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

  8. WAVEFORM 8

    B001MSEE68
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Throttle Actuator Positive Terminal Signal
    Terminal No. (symbol) Tool Setting Condition
    D27-21 (M+) - D27-19 (ME01) 5 V/DIV., 1 ms./DIV. Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  9. WAVEFORM 9

    B001MO7E62
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Throttle Actuator Negative Terminal Signal
    Terminal No. (symbol) Tool Setting Condition
    D27-20 (M-) - D27-19 (ME01) 5 V/DIV., 1 ms./DIV. Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  10. WAVEFORM 10

    B001KLIE10
    *1 10 V/DIV.
    *2 20 ms./DIV.
    Purge VSV Signal
    Terminal No. (symbol) Tool Setting Condition
    D27-28 (PRG) - D27-104 (E1) 10 V/DIV., 20 ms./DIV. 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.

  11. WAVEFORM 11

    B001L6AE04
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Engine Speed Signal
    Terminal No. (Symbol) Tool Setting Condition
    A60-26 (TACH) - D27-104 (E1) 5 V/DIV., 10 ms./DIV. Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  12. WAVEFORM 12

    B001MSQE12
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly Signal
    Terminal No. (symbol) Tool Setting Condition
    D27-36 (OC1+) - D27-59 (OC1-) 5 V/DIV., 1 ms./DIV. Idling

  13. WAVEFORM 13

    B001L1EE17
    *a 1 V/DIV.
    *b 10 μsec./DIV.
    CAN Communication Signal (Reference)
    Terminal No. (symbol) Tool Setting Condition
    A60-13 (CANH) - D27-104 (E1) 1 V/DIV., 10 μsec./DIV. Engine stopped and power switch on (IG)
    A60-12 (CANP) - D27-104 (E1) 1 V/DIV., 10 μsec./DIV. Engine stopped and power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  14. WAVEFORM 14

    B001LTIE20
    *a 1 V/DIV.
    *b 10 μsec./DIV.
    CAN Communication Signal (Reference)
    Terminal No. (symbol) Tool Setting Condition
    A60-5 (CANL) - D27-104 (E1) 1 V/DIV., 10 μsec./DIV. Engine stopped and power switch on (IG)
    A60-4 (CANN) - D27-104 (E1) 1 V/DIV., 10 μsec./DIV. Engine stopped and power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  15. WAVEFORM 15

    B001ME2E01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Engine Water Pump Assembly Signal (from ECM to Engine Water Pump Assembly)
    Terminal No. (symbol) Tool Setting Condition
    A60-10 (WPO) - D27-104 (E1) 5 V/DIV., 20 ms./DIV. Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine water pump assembly speed increases.

  16. WAVEFORM 16

    B001ME2E01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Engine Water Pump Assembly Signal (from Engine Water Pump Assembly to ECM)
    Terminal No. (symbol) Tool Setting Condition
    A60-11 (WPI) - D27-104 (E1) 5 V/DIV., 20 ms./DIV. Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine water pump assembly speed increases.

  17. WAVEFORM 17

    B001ME2E01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Camshaft Revolution Signal from ECM to Power Management Control ECU and Inverter with Converter Assembly
    Terminal No. (symbol) Tool Setting Condition
    D27-48 (G2O) - D27-104 (E1) 5 V/DIV., 20 ms./DIV. Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.