SFI SYSTEM TERMINALS OF ECM

A00440ZE21

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
A56-20 (BATT) - D28-104 (E1) R - BR Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) Power switch off 11 to 16 V
A56-2 (+B) - D28-104 (E1) B - BR Power source of ECM Power switch on (IG) 11 to 14 V
A56-1 (+B2) - D28-104 (E1) B - BR Power source of ECM Power switch on (IG) 11 to 14 V
A56-3 (+BM) - D28-104 (E1) GR - BR Power source of throttle actuator Power switch off 11 to 16 V
D28-108 (IGT1) - D28-104 (E1) GR - BR

Ignition coil assembly

(ignition signal)

 Idling

Pulse generation

(see waveform 1)
D28-107 (IGT2) - D28-104 (E1) W - BR
D28-106 (IGT3) - D28-104 (E1) G - 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) Y - BR Air fuel ratio sensor (sensor 1) heater Power switch on (IG) 11 to 14 V
Idling

Pulse generation

(see waveform 5)
D28-103 (A1A+) - D28-104 (E1) Y - BR Air fuel ratio sensor (sensor 1) Idling

3.3 V*1
D28-126 (A1A-) - D28-104 (E1) BR - BR Air fuel ratio sensor (sensor 1) Idling

3.0 V*1
D28-41 (HT1B) - D28-86 (E03) BR - 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-) 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)
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) P - BR 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
D28-17 (+BVG) - D28-104 (E1) B - BR Power source of mass air flow meter sub-assembly Power switch on (IG) 11 to 14 V
D28-94 (VG) - D28-117 (E2G) B - W Mass air flow meter sub-assembly Idling, neutral (N) selected, A/C switch off 0.5 to 3.0 V
A56-36 (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)
A56-8 (FC) - D28-104 (E1) R - BR Fuel pump control Power switch on (IG) 11 to 14 V
Idling Below 1.5 V
A56-7 (TC) - D28-104 (E1) P - BR Terminal TC of DLC3 Power switch on (IG) 11 to 14 V
D28-36 (OC1+) - D28-59 (OC1-) Y - G Camshaft timing oil control valve assembly Idling

Pulse generation

(see waveform 11)
A56-13 (CANH) - D28-104 (E1) P - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 12)
A56-5 (CANL) - D28-104 (E1) V - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 13)
A56-12 (CANP) - D28-104 (E1) B - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 12)
A56-4 (CANN) - D28-104 (E1) W - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 13)
A56-28 (IGSW) - D28-104 (E1) W - BR Power switch Power switch on (IG) 11 to 14 V
A56-6 (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
A56-10 (WPO) - D28-104 (E1) L - BR Engine water pump assembly Idling with warm engine

Pulse generation

(see waveform 14)
A56-11 (WPI) - D28-104 (E1) G - BR Engine water pump assembly Idling with warm engine

Pulse generation

(see waveform 15)
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 16)
D28-44 (EGR2) - D28-104 (E1) V - BR EGR valve assembly EGR valve operating

Pulse generation

(see waveform 16)
D28-43 (EGR3) - D28-104 (E1) Y - BR EGR valve assembly EGR valve operating

Pulse generation

(see waveform 16)
D28-42 (EGR4) - D28-104 (E1) LG - BR EGR valve assembly EGR valve operating

Pulse generation

(see waveform 16)
D28-48 (G2O) - D28-104 (E1) Y - BR Camshaft revolution signal Idling

Pulse generation

(see waveform 17)
A56-22 (FANH) - D28-104 (E1) LG - BR Cooling fan relay Power switch on (IG) 11 to 14 V
A56-21 (FANL) - D28-104 (E1) L - BR Cooling fan relay Power switch on (IG) 11 to 14 V
A56-46 (PWMS) - D28-104 (E1) G - BR EV city mode switch Power switch on (IG), EV city mode switch off 11 to 14 V
Power switch on (IG), EV city mode switch on 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
A56-32 (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

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


  1. WAVEFORM 1

    A00407NE29
    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

    A0040RJE02
    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

    A0042IEE01
    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

    A0043HNE02
    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

    A0041JME01
    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

    Tech Tips

    The wavelength varies in accordance with the engine operating condition.

  6. WAVEFORM 6

    A0043KPE02
    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

    A0043L2E01
    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

    A00416EE03
    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

    A00444NE01
    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

    A0040KFE10
    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

    A0040BLE01
    Camshaft Timing Oil Control Valve Assembly Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  12. WAVEFORM 12

    A0041VWE02
    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.

  13. WAVEFORM 13

    A00400LE02
    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.

  14. WAVEFORM 14

    A0041TSE01
    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 wavelength becomes shorter as the engine water pump speed increases.

  15. WAVEFORM 15

    A0041TSE01
    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.

  16. WAVEFORM 16

    A00448EE01
    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

  17. WAVEFORM 17

    A0041TSE01
    Camshaft Revolution Signal from ECM to Power Management Control ECU and 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.