SFI SYSTEM (w/ EGR System) TERMINALS OF ECM

A01JAAPE09

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 Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 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 14 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 2)
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 Idling

Pulse generation

(see waveform 3)
D28-82 (#40) - D28-109 (E01) R - BR
D28-18 (HA1A) - D28-46 (E04) Y - W-B Air fuel ratio sensor (sensor 1) heater Power switch on (IG) 11 to 14 V
Idling with warm engine

Pulse generation

(see waveform 4)
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 - W-B 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 5)
D28-87 (KNK1) - D28-110 (EKNK) B - W Knock control sensor Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(see waveform 6)
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
D28-94 (VG) - D28-117 (E2G) B - W Mass air flow meter sub-assembly Idling, shift lever in N, A/C switch OFF 0.5 to 3.0 V
A57-36 (W) - D28-104 (E1) LG - BR MIL Power switch on (IG) (MIL goes on) Below 3.0 V
Idling 11 to 14 V
D28-90 (VTA1) - D28-111 (ETA) Y - G Throttle position sensor (for engine control)

Power switch on (IG),

Accelerator pedal released

(Throttle valve fully closed)

 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 released

(Throttle valve fully closed)

 2.1 to 3.1 V
D28-88 (VCTA) - D28-111 (ETA) R - G Power source of 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 7)
D28-20 (M-) - D28-19 (ME01) P - BR Throttle actuator Idling with warm engine

Pulse generation

(see waveform 8)
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 9)
A57-8 (FC) - D28-104 (E1) R - BR Fuel pump control Power switch on (IG) 11 to 14 V
Idling Below 1.5 V
A57-7 (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 10)
A57-13 (CANH) - D28-104 (E1) P - BR CAN communication line Engine stopped and power switch on (IG)

Pulse generation

(see waveform 11)
A57-5 (CANL) - D28-104 (E1) V - BR CAN communication line Engine stopped and power switch on (IG)

Pulse generation

(see waveform 12)
A57-12 (CANP) - D28-104 (E1) B - BR CAN communication line Engine stopped and power switch on (IG)

Pulse generation

(see waveform 11)
A57-4 (CANN) - D28-104 (E1) W - BR CAN communication line Engine stopped and power switch on (IG)

Pulse generation

(see waveform 12)
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 5.5 V
A57-10 (WPO) - D28-104 (E1) L - BR Engine water pump assembly Idling with warm engine

Pulse generation

(see waveform 13)
A57-11 (WPI) - D28-104 (E1) G - BR Engine water pump assembly Idling with warm engine

Pulse generation

(see waveform 14)
D28-72 (VCPM) - D28-71 (EPIM) L - Y Manifold absolute pressure sensor assembly Power switch on (IG) 4.5 to 5.5 V
D28-69 (PIM) - D28-71 (EPIM) Y - Y Manifold absolute pressure sensor assembly Power switch on (IG) 4.0 to 5.5 V
D28-45 (EGR1) - D28-104 (E1) R - BR EGR valve assembly Idling with warm engine

Pulse generation

(see waveform 15)
D28-44 (EGR2) - D28-104 (E1) V - BR EGR valve assembly Idling with warm engine

Pulse generation

(see waveform 15)
D28-43 (EGR3) - D28-104 (E1) Y - BR EGR valve assembly Idling with warm engine

Pulse generation

(see waveform 15)
D28-42 (EGR4) - D28-104 (E1) LG - BR EGR valve assembly Idling with warm engine

Pulse generation

(see waveform 15)
D28-48 (G2O) - D28-104 (E1) Y - BR Camshaft position signal Idling

Pulse generation

(see waveform 16)
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), Power mode switch off 11 to 14 V
Power switch on (IG), Power 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
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

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


  1. WAVEFORM 1

    A01JBY2E01
    Igniter IGT Signal (from ECM to Igniter) and Igniter IGF Signal (from Igniter to ECM)
    ECM Terminal Name

    Between IGT (1 to 4) and E1

    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

    A01JB80E04
    Crankshaft Position Sensor and Camshaft Position Sensor Signal
    ECM Terminal Name

    Between NE+ and NE-

    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.

  3. WAVEFORM 3

    A01JBJNE01
    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.

  4. WAVEFORM 4

    A01JCO1E01
    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 warm engine

    Tech Tips

    The wavelength varies in accordance with the engine operating condition.

  5. WAVEFORM 5

    A01JB6DE01
    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 B1 S2 show the values input to the ECM from the heated oxygen sensor.

  6. WAVEFORM 6

    A01JAH1E01
    Knock Control Sensor Signal
    ECM Terminal Name Between KNK1 and EKNK
    Tester Range 1 V/DIV., 1 ms./DIV.
    Condition Engine speed maintained at 4000 rpm after engine warming engine

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

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

  7. WAVEFORM 7

    A01J94ZE01
    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.

  8. WAVEFORM 8

    A01JCONE01
    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.

  9. WAVEFORM 9

    A01J8RXE10
    Purge VSV
    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.

  10. WAVEFORM 10

    A01JB4TE01
    Camshaft Timing Oil Control Valve Assembly Signal
    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  11. WAVEFORM 11

    A01J8IHE02
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANH and E1, CANP and E1
    Tester Range 1 V/DIV., 10 μsec./DIV.
    Condition Engine stopped and power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  12. WAVEFORM 12

    A01J8NIE02
    CAN Communication Signal (Reference)
    ECM Terminal Name Between CANL and E1, CANN and E1
    Tester Range 1 V/DIV., 10 μsec./DIV.
    Condition Engine stopped and power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  13. WAVEFORM 13

    A01JCYDE01
    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 assembly speed increases.

  14. WAVEFORM 14

    A01JCYDE01
    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 assembly speed increases.

  15. WAVEFORM 15

    A01J9TZE01
    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 Idling with warm engine

  16. WAVEFORM 16

    A01JCYDE01
    Camshaft Revolution Signal from ECM to Power Management Control ECU and Inverter with Converter Assembly (MG ECU)
    ECM Terminal Name Between G2O and E1
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.