SFI SYSTEM TERMINALS OF ECM

A005B0BE03

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
A57-20 (BATT) - D28-104 (E1) R - BR Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) Always 11 to 16 V
A57-2 (+B) - D28-104 (E1) B - BR Power source of ECM Power switch on (IG) 11 to 14 V
A57-1 (+B2) - D28-104 (E1) B - BR Power source of ECM Power switch on (IG) 11 to 14 V
A57-3 (+BM) - D28-104 (E1) GR - BR Power source of throttle actuator Always 11 to 16 V
D28-108 (IGT1) - D28-104 (E1) P - BR

Ignition coil assembly

(ignition signal)

 Idling

Pulse generation

(see waveform 1)
D28-107 (IGT2) - D28-104 (E1) G - BR
D28-106 (IGT3) - D28-104 (E1) P - BR
D28-105 (IGT4) - D28-104 (E1) Y - BR
D28-23 (IGF1) - D28-104 (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)
D28-74 (NE+) - D28-120 (NE-) B - W Crankshaft position sensor Idling with warm engine

Pulse generation

(see waveform 2)
D28-76 (G2+) - D28-122 (G2-) B - W Camshaft position sensor Idling with warm engine

Pulse generation

(see waveform 3)
D28-85 (#10) - D28-109 (E01) Y - BR Fuel injector assembly Power switch on (IG) 11 to 14 V
D28-84 (#20) - D28-109 (E01) B - BR
D28-83 (#30) - D28-109 (E01) L - BR
D28-82 (#40) - D28-109 (E01) R - BR
D28-85 (#10) - D28-109 (E01) Y - BR Fuel injector assembly Idling

Pulse generation

(see waveform 4)
D28-84 (#20) - D28-109 (E01) B - BR
D28-83 (#30) - D28-109 (E01) L - BR
D28-82 (#40) - D28-109 (E01) R - BR
D28-18 (HA1A) - D28-46 (E04) G - BR Air fuel ratio sensor (sensor 1) heater Power switch on (IG) 11 to 14 V
Idling with cold engine

Pulse generation

(see waveform 5)
D28-103 (A1A+) - D28-104 (E1) R - BR Air fuel ratio sensor (sensor 1) Engine stopped, power switch on (IG)

3.3 V*

D28-126 (A1A-) - D28-104 (E1) G - BR Air fuel ratio sensor (sensor 1) Engine stopped, power switch on (IG)

3.0 V*

D28-41 (HT1B) - D28-86 (E03) G - BR Heated oxygen sensor (sensor 2) heater Power switch on (IG) 11 to 14 V
Idling Below 3.0 V
D28-125 (OX1B) - D28-102 (O1B-) G - R Heated oxygen sensor (sensor 2) Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(see waveform 6)
D28-87 (KNK1) - D28-110 (EKNK) B - W Knock control sensor Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(see waveform 7)
D28-64 (THW) - D28-65 (ETHW) BR - P Engine coolant temperature sensor Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
D28-116 (THA) - D28-93 (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
D28-94 (VG) - D28-117 (E2G) B - W Mass air flow meter sub-assembly Idling, park (P) or neutral (N) selected, A/C switch off 0.5 to 3.0 V
A57-36 (W) - D28-104 (E1) LG - BR MIL Power switch on (IG) (MIL on) Below 3.0 V
Power switch on (READY) 11 to 14 V
D28-90 (VTA1) - D28-111 (ETA) Y - G Throttle position sensor (for engine control) Power switch on (IG), accelerator pedal fully released 0.5 to 1.1 V
D28-89 (VTA2) - D28-111 (ETA) B - G Throttle position sensor (for sensor malfunction detection) Power switch on (IG), accelerator pedal fully released 2.1 to 3.1 V
D28-88 (VCTA) - D28-111 (ETA) R - G Power source of throttle position sensor (specific voltage) Power switch on (IG) 4.5 to 5.5 V
D28-21 (M+) - D28-19 (ME01) L - BR Throttle actuator Idling with warm engine

Pulse generation

(see waveform 8)
D28-20 (M-) - D28-19 (ME01) P - BR Throttle actuator Idling with warm engine

Pulse generation

(see waveform 9)
D28-28 (PRG) - D28-104 (E1) V - BR Purge VSV Power switch on (IG) 11 to 14 V
Idling, under purge control

Pulse generation

(see waveform 10)
A57-8 (FC) - D28-104 (E1) R - BR Fuel pump control Power switch on (IG) 11 to 14 V
Idling Below 1.5 V
A57-26 (TACH) - D28-104 (E1) B - BR Engine speed Idling

Pulse generation

(see waveform 11)
A57-7 (TC) - D28-104 (E1) P - BR Terminal TC of DLC3 Power switch on (IG) 11 to 14 V
D28-36 (OC1+) - D28-59 (OC1-) G - Y Camshaft timing oil control valve assembly Idling

Pulse generation

(see waveform 12)
A57-13 (CANH) - D28-104 (E1) P - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 13)
A57-5 (CANL) - D28-104 (E1) V - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 14)
A57-12 (CANP) - D28-104 (E1) B - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 13)
A57-4 (CANN) - D28-104 (E1) W - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 14)
A57-28 (IGSW) - D28-104 (E1) W - BR Power switch Power switch on (IG) 11 to 14 V
A57-6 (MREL) - D28-104 (E1) G - BR EFI MAIN relay Power switch on (IG) 11 to 14 V
D28-99 (VCV1) - D28-104 (E1) R - BR Power source of camshaft position sensor Power switch on (IG) 4.5 to 5.0 V
A57-10 (WPO) - D28-104 (E1) L - BR Engine water pump assembly Idling with warm engine

Pulse generation

(see waveform 15)
A57-11 (WPI) - D28-104 (E1) G - BR Engine water pump assembly Idling with warm engine

Pulse generation

(see waveform 16)
D28-72 (VCPM) - D28-71 (EPIM) L - Y Power source of manifold absolute pressure sensor Power switch on (IG) 4.75 to 5.25 V
D28-69 (PIM) - D28-71 (EPIM) B - Y Manifold absolute pressure sensor Power switch on (IG) 3.0 to 5.0 V
D28-45 (EGR1) - D28-104 (E1) R - BR EGR valve assembly EGR valve operating

Pulse generation

(see waveform 17)
D28-44 (EGR2) - D28-104 (E1) V - BR EGR valve assembly EGR valve operating

Pulse generation

(see waveform 17)
D28-43 (EGR3) - D28-104 (E1) Y - BR EGR valve assembly EGR valve operating

Pulse generation

(see waveform 17)
D28-42 (EGR4) - D28-104 (E1) LG - BR EGR valve assembly EGR valve operating

Pulse generation

(see waveform 17)
D28-48 (G2O) - D28-104 (E1) Y - BR Camshaft revolution signal Idling

Pulse generation

(see waveform 18)
A57-22 (FANH) - D28-104 (E1) LG - BR Cooling fan relay Power switch on (IG) 11 to 14 V
A57-21 (FANL) - D28-104 (E1) L - BR Cooling fan relay Power switch on (IG) 11 to 14 V
A57-46 (PWMS) - D28-104 (E1) G - BR Power mode switch Power switch on (IG) 11 to 14 V
Power switch on (IG), power mode switch pressed 0 to 1.5 V
D28-104 (E1) - Body ground BR - Body ground Ground Always Below 1 Ω
D28-109 (E01) - Body ground BR - Body ground Ground Always Below 1 Ω
D28-81 (E02) - Body ground W-B - Body ground Ground Always Below 1 Ω
D28-86 (E03) - Body ground BR - Body ground Ground Always Below 1 Ω
D28-46 (E04) - Body ground BR - Body ground Ground Always Below 1 Ω
A57-32 (EC) - Body ground W-B - Body ground Ground Always Below 1 Ω
D28-22 (GE01) - D28-104 (E1) W-B - BR Shield earth (ground) circuit of throttle actuator Always Below 1 V

Tech Tips

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


  1. WAVEFORM 1

    A005ADGE53
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Ignition Coil Assembly Signal (IGT and IGF1 Signal)
    ECM Terminal Name

    CH1: Between IGT (1 to 4) and E1

    CH2: Between IGF1 and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  2. WAVEFORM 2

    A005EOUE19
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Crankshaft Position Sensor Signal
    ECM Terminal Name Between NE+ and NE-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  3. WAVEFORM 3

    A005ANXE01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Camshaft Position Sensor Signal
    ECM Terminal Name Between G2+ and G2-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  4. WAVEFORM 4

    A005CNSE02
    *1 20 V/DIV.
    *2 20 ms./DIV.
    No. 1 (to No. 4) Fuel Injector Assembly Signal
    ECM Terminal Name Between #10 (to #40) and E01
    Tester Range 20 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  5. WAVEFORM 5

    A005ASWE01
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Air Fuel Ratio Sensor (Sensor 1) Heater Signal
    ECM Terminal Name Between HA1A and E04
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling with cold engine

  6. WAVEFORM 6

    A005AQBE02
    *1 0.2 V/DIV.
    *2 200 ms./DIV.
    Heated Oxygen Sensor (Sensor 2) Signal
    ECM Terminal Name Between OX1B and O1B-
    Tester Range 0.2 V/DIV. 200 ms./DIV.
    Condition 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

    A005C4AE01
    *a 1 V/DIV.
    *b 1 ms./DIV.
    Knock Control Sensor Signal
    ECM Terminal Name Between KNK1 and EKNK
    Tester Range 1 V/DIV., 1 ms./DIV.
    Condition 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

    A005ACFE70
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Throttle Actuator Positive Terminal Signal
    ECM Terminal Name Between M+ and ME01
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  9. WAVEFORM 9

    A005D8QE64
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Throttle Actuator Negative Terminal Signal
    ECM Terminal Name Between M- and ME01
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  10. WAVEFORM 10

    A005CP7E10
    *1 10 V/DIV.
    *2 20 ms./DIV.
    Purge VSV Signal
    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition 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

    A005ANOE04
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Engine Speed Signal
    ECM Terminal Name Between TACH and E1
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  12. WAVEFORM 12

    A005E3AE14
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve Assembly Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  13. WAVEFORM 13

    A005EA7E02
    *a 1 V/DIV.
    *b 10 μsec./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANH and E1, CANP and E1
    Tester Range 1 V/DIV., 10 μsec./DIV.
    Condition Power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  14. WAVEFORM 14

    A005CUIE02
    *a 1 V/DIV.
    *b 10 μsec./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANL and E1, CANN and E1
    Tester Range 1 V/DIV., 10 μsec./DIV.
    Condition Power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  15. WAVEFORM 15

    A005EWTE01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Engine Water Pump Assembly Signal (from ECM to Engine Water Pump Assembly)
    ECM Terminal Name Between WPO and E1
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the engine water pump assembly speed.

  16. WAVEFORM 16

    A005EWTE01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Engine Water Pump Assembly Signal (from Engine Water Pump Assembly to ECM)
    ECM Terminal Name Between WPI and E1
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

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

  17. WAVEFORM 17

    A0059OWE01
    *1 20 V/DIV.
    *2 50 ms./DIV.
    EGR Valve Assembly Signal
    ECM Terminal Name Between EGR1 and E1, EGR2 and E1, EGR3 and E1, EGR4 and E1
    Tester Range 20 V/DIV., 50 ms./DIV.
    Condition EGR valve operating

  18. WAVEFORM 18

    A005EWTE01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Camshaft Revolution Signal from ECM to Inverter with Converter Assembly
    ECM Terminal Name Between G2O and E1
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.