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SFI SYSTEM TERMINALS OF ECM

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  1. A0156RWE11

    CHECK ECM

    Tip:

    The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of 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
    A38-1 (BATT) - C45-81 (E1) L - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
    C45-41 (+BM) - C45-81 (E1) P - W-B Power source of throttle actuator Always 11 to 14 V
    A38-28 (IGSW) - C45-81 (E1) B - W-B Engine switch Engine switch on (IG) 11 to 14 V
    A38-3 (+B) - C45-81 (E1) B - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
    A38-2 (+B2) - C45-81 (E1) B - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
    C45-58 (OC1+) - C45-57 (OC1-) B - B-L Camshaft oil control valve (OCV) (for Intake Side of Bank 1) Idling

    Pulse generation

    (See waveform 1)
    C45-52 (OC2+) - C45-51 (OC2-) L-B - R-B Camshaft oil control valve (OCV) (for Intake Side of Bank 2) Idling

    Pulse generation

    (See waveform 1)
    C45-56 (OE1+) - C45-55 (OE1-) L-W - L-B Camshaft oil control valve (OCV) (for Exhaust Side of Bank 1) Idling

    Pulse generation

    (See waveform 1)
    C45-50 (OE2+) - C45-49 (OE2-) L-R - L-B Camshaft oil control valve (OCV) (for Exhaust Side of Bank 2) Idling

    Pulse generation

    (See waveform 1)
    A38-34 (MREL) - C45-81 (E1) V - W-B EFI relay Engine switch on (IG) 11 to 14 V
    C45-74 (VG) - C45-75 (E2G) L-Y - G-W Mass air flow meter Idling, Shift lever in P or N, A/C switch off 0.5 to 3.0 V
    C45-73 (THA) - C45-98 (ETHA) Y-B - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
    C45-76 (THW) - C45-97 (ETHW) G-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
    C45-80 (VCTA) - C45-79 (ETA) Y - B Power source of throttle position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
    C45-78 (VTA1) - C45-79 (ETA) B-L - B Throttle position sensor (for engine control)

    Engine switch on (IG),

    Accelerator pedal fully released

    		 0.5 to 1.1 V

    Engine switch on (IG),

    Accelerator pedal fully depressed

    		 3.2 to 4.8 V
    C45-77 (VTA2) - C45-79 (ETA) B-R - B Throttle position sensor (for sensor malfunction detection)

    Engine switch on (IG),

    Accelerator pedal fully released

    		 2.1 to 3.1 V

    Engine switch on (IG),

    Accelerator pedal fully depressed

    		 4.6 to 5.0 V
    A38-55 (VPA) - A38-58 (EPA) R - W Accelerator pedal position sensor (for engine control)

    Engine switch on (IG),

    Accelerator pedal released

    		 0.5 to 1.1 V

    Engine switch on (IG),

    Accelerator pedal fully depressed

    		 2.6 to 4.5 V
    A38-56 (VPA2) - A38-60 (EPA2) GR - BE Accelerator pedal position sensor (for sensor malfunctioning detection)

    Engine switch on (IG),

    Accelerator pedal released

    		 1.2 to 2.0 V

    Engine switch on (IG),

    Accelerator pedal fully depressed

    		 3.4 to 5.0 V
    A38-57 (VCPA) - A38-58 (EPA) L - W Power source of accelerator pedal position sensor (for VPA) Engine switch on (IG) 4.5 to 5.5 V
    A38-59 (VCP2) - A38-60 (EPA2) V - BE Power source of accelerator pedal position sensor (for VPA2) Engine switch on (IG) 4.5 to 5.5 V
    C45-22 (HA1A) - C45-23 (E04) L - W-B

    A/F sensor heater

    bank 1 sensor 1

    		 Idling with warm engine

    Pulse generation

    (See waveform 2)
    Engine switch on (IG) 11 to 14 V
    C45-20 (HA2A) - C45-21 (E05) G - W-B

    A/F sensor heater

    bank 2 sensor 1

    		 Idling with warm engine

    Pulse generation

    (See waveform 2)
    Engine switch on (IG) 11 to 14 V
    C45-126 (A1A+) - C45-81 (E1) G - W-B

    A/F sensor

    bank 1 sensor 1

    		 Engine switch on (IG) 3.3 V*
    C45-125 (A1A-) - C45-81 (E1) R - W-B

    A/F sensor

    bank 1 sensor 1

    		 Engine switch on (IG) 2.9 V*
    C45-103 (A2A+) - C45-81 (E1) P - W-B

    A/F sensor

    bank 2 sensor 1

    		 Engine switch on (IG) 3.3 V*
    C45-102 (A2A-) - C45-81 (E1) L - W-B

    A/F sensor

    bank 2 sensor 1

    		 Engine switch on (IG) 2.9 V*
    C45-45 (HT1B) - C45-46 (E03) G-B - W-B

    Heated oxygen sensor heater

    bank 1 sensor 2

    		 Idling Below 3.0 V
    Engine switch on (IG) 11 to 14 V
    C45-44 (HT2B) - C45-46 (E03) B - W-B

    Heated oxygen sensor heater

    bank 2 sensor 2

    		 Idling Below 3.0 V
    Engine switch on (IG) 11 to 14 V
    C45-114 (OX1B) - C45-115 (EX1B) G - L

    Heated oxygen sensor

    bank 1 sensor 2

    		 Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

    Pulse generation

    (See waveform 3)
    C45-112 (OX2B) - C45-113 (EX2B) R - W

    Heated oxygen sensor

    bank 2 sensor 2

    		 Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

    Pulse generation

    (See waveform 3)
    C45-86 (#10) - C45-43 (E01) R-L - W-B Fuel injector Engine switch on (IG) 11 to 14 V
    Idling

    Pulse generation

    (See waveform 4)
    C45-109 (#20) - C45-43 (E01) L - W-B Fuel injector Engine switch on (IG) 11 to 14 V
    Idling

    Pulse generation

    (See waveform 4)
    C45-85 (#30) - C45-43 (E01) R-B - W-B Fuel injector Engine switch on (IG) 11 to 14 V
    Idling

    Pulse generation

    (See waveform 4)
    C45-108 (#40) - C45-43 (E01) Y - W-B Fuel injector Engine switch on (IG) 11 to 14 V
    Idling

    Pulse generation

    (See waveform 4)
    C45-84 (#50) - C45-43 (E01) G - W-B Fuel injector Engine switch on (IG) 11 to 14 V
    Idling

    Pulse generation

    (See waveform 4)
    C45-107 (#60) - C45-43 (E01) R - W-B Fuel injector Engine switch on (IG) 11 to 14 V
    Idling

    Pulse generation

    (See waveform 4)
    C45-83 (#70) - C45-43 (E01) W - W-B Fuel injector Engine switch on (IG) 11 to 14 V
    Idling

    Pulse generation

    (See waveform 4)
    C45-106 (#80) - C45-43 (E01) R-B - W-B Fuel injector Engine switch on (IG) 11 to 14 V
    Idling

    Pulse generation

    (See waveform 4)
    C45-94 (KNK1) - C45-93 (EKNK) R - G Knock sensor Engine speed maintained at 4000 rpm after warming up engine

    Pulse generation

    (See waveform 5)
    C45-117 (KNK2) - C45-116 (EKN2) W - B Knock sensor Engine speed maintained at 4000 rpm after warming up engine

    Pulse generation

    (See waveform 5)
    C45-96 (KNK3) - C45-95 (EKN3) W - B Knock sensor Engine speed maintained at 4000 rpm after warming up engine

    Pulse generation

    (See waveform 5)
    C45-119 (KNK4) - C45-118 (EKN4) R - G Knock sensor Engine speed maintained at 4000 rpm after warming up engine

    Pulse generation

    (See waveform 5)
    C45-92 (VV1+) - C45-91 (VV1-) R - Y Variable valve timing (VVT) sensor (for Intake Side of Bank 1) Idling

    Pulse generation

    (See waveform 6)
    C45-87 (VV2+) - C45-88 (VV2-) R - Y Variable valve timing (VVT) sensor (for Intake Side for Bank 2) Idling

    Pulse generation

    (See waveform 6)
    C45-69 (EV1+) - C45-68 (EV1-) R-L - Y Variable valve timing (VVT) sensor (for Exhaust Side of Bank 1) Idling

    Pulse generation

    (See waveform 16)
    C45-64 (EV2+) - C45-65 (EV2-) R-L - Y Variable valve timing (VVT) sensor (for Exhaust Side of Bank 2) Idling

    Pulse generation

    (See waveform 16)
    C45-110 (NE+) - C45-111 (NE-) W - G-W Crankshaft position sensor Idling

    Pulse generation

    (See waveform 6)
    C45-40 (IGT1) - C45-81 (E1) B-Y - W-B Ignition coil (ignition signal) Idling

    Pulse generation

    (See waveform 7)
    C45-33 (IGT2) - C45-81 (E1) L-B - W-B Ignition coil (ignition signal) Idling

    Pulse generation

    (See waveform 7)
    C45-37 (IGT3) - C45-81 (E1) B - W-B Ignition coil (ignition signal) Idling

    Pulse generation

    (See waveform 7)
    C45-34 (IGT4) - C45-81 (E1) L-B - W-B Ignition coil (ignition signal) Idling

    Pulse generation

    (See waveform 7)
    C45-35 (IGT5) - C45-81 (E1) G-R - W-B Ignition coil (ignition signal) Idling

    Pulse generation

    (See waveform 7)
    C45-36 (IGT6) - C45-81 (E1) G - W-B Ignition coil (ignition signal) Idling

    Pulse generation

    (See waveform 7)
    C45-38 (IGT7) - C45-81 (E1) G-W - W-B Ignition coil (ignition signal) Idling

    Pulse generation

    (See waveform 7)
    C45-39 (IGT8) - C45-81 (E1) G-B - W-B Ignition coil (ignition signal) Idling

    Pulse generation

    (See waveform 7)
    C45-104 (IGF1) - C45-81 (E1) G-B - W-B Ignition coil (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V
    Idling

    Pulse generation

    (See waveform 7)
    C45-105 (IGF2) - C45-81 (E1) R - W-B Ignition coil (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V
    Idling

    Pulse generation

    (See waveform 7)
    C45-63 (PRG) - C45-81 (E1) L-B - W-B Purge VSV Engine switch on (IG) 11 to 14 V
    Idling

    Pulse generation

    (See waveform 8)
    A38-13 (SPD) - C45-81 (E1) V - W-B Speed signal from combination meter Driving at 20 km/h (12 mph)

    Pulse generation

    (See waveform 9)
    A38-46 (STA) - C45-81 (E1) R - W-B Starter signal Cranking 5.5 V or higher
    C45-120 (NSW) - C45-81 (E1) L - W-B Park/neutral position switch Engine switch on (IG), Shift lever in other than P and N 11 to 14 V
    Engine switch on (IG), Shift lever in P or N Below 3.0 V
    A38-36 (STP) - C45-81 (E1) R - W-B Stop light switch Brake pedal depressed 7.5 to 14 V
    Brake pedal released Below 1.5 V
    A38-35 (ST1-) - C45-81 (E1) P - W-B

    Stop light switch

    (opposite to STP terminal)

    Engine switch on (IG),

    Brake pedal depressed

    		 Below 1.5 V

    Engine switch on (IG),

    Brake pedal released

    		 7.5 to 14 V
    C45-19 (M+) - C45-82 (ME01) R - W-B Throttle actuator Idling with warm engine

    Pulse generation

    (See waveform 10)
    C45-18 (M-) - C45-82 (ME01) G - W-B Throttle actuator Idling with warm engine

    Pulse generation

    (See waveform 11)
    A38-52 (FPC) - C45-81 (E1) W - W-B Fuel pump control Engine switch on (IG) Below 1.5 V
    A38-24 (W) - C45-81 (E1) R - W-B MIL Engine switch on (IG) Below 3.0 V
    Idling 11 to 14 V
    A38-16 (TC) - C45-81 (E1) V - W-B Terminal TC of DLC3 Engine switch on (IG) 11 to 14 V
    A38-15 (TACH) - C45-81 (E1) W - W-B Engine speed Idling

    Pulse generation

    (See waveform 12)
    C45-67 (VCV1) - C45-98 (ETHA) L - BR Power source for sensor (specific voltage) Engine switch on (IG) 4.75 to 5.25 V
    C45-66 (VCV2) - C45-98 (ETHA) L - BR Power source for sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
    C45-32 (ALT) - C45-81 (E1) R - W-B Generator Engine switch on (IG) 11 to 14 V
    A38-10 (CANH) - C45-81 (E1) P - W-B CAN communication line Engine switch on (IG)

    Pulse generation

    (See waveform 13)
    A38-11 (CANL) - C45-81 (E1) B - W-B CAN communication line Engine switch on (IG)

    Pulse generation

    (See waveform 14)
    C45-62 (ACIS) - C45-81 (E1) L-Y - W-B VSV for ACIS (Acoustic Control Induction System) operation signal Engine switch on (IG) 11 to 14 V
    C45-90 (G2) - C45- 89 (G2-) G - Y Camshaft position sensor Idling

    Pulse generation

    (See waveform 15)
    A38-14 (STSW) - C45-81 (E1) R - W-B Starter switch Shift lever in P or N, Cranking 6.0 V or higher
    A38-41 (ACCR) - C45-81 (E1) L-Y - W-B ACC relay control signal Engine switch on (IG) → Cranking 11 to 14 V → Below 1 V
    C45-16 (STAR) - C45-81 (E1) L - W-B Starter relay control Engine switch on (IG) Below 1.5 V
    Cranking 5.5 V or higher
    C45-72 (PSP) - C45-81 (E1) G - W-B Power steering oil pressure sensor Engine switch on (IG) 0.33 to 3.6 V
    Tip:

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


    1. A015A8GE02

      WAVEFORM 1:

      Table 1. Camshaft Oil Control Valve (OCV)
      Terminal No. (Symbol) Tool Setting Condition
      C45-58 (OC1+) - C45-57 (OC1-) 5 V/DIV., 1 msec./DIV. Idling
      C45-52 (OC2+) - C45-51 (OC2-) 5 V/DIV., 1 msec./DIV. Idling
      C45-56 (OE1+) - C45-55 (OE1-) 5 V/DIV., 1 msec./DIV. Idling
      C45-50 (OE2+) - C45-49 (OE2-) 5 V/DIV., 1 msec./DIV. Idling
    2. A0157DDE02

      WAVEFORM 2:

      Table 2. A/F Sensor Heater Signal
      Terminal No. (Symbol) Tool Setting Condition
      C45-22 (HA1A) - C45-23 (E04) 5 V/DIV., 10 msec./DIV. Idling with warm engine
      C45-20 (HA2A) - C45-21 (E05) 5 V/DIV., 10 msec./DIV. Idling with warm engine
      Tip:

      The wavelength varies in accordance with the engine operating condition.

    3. A0158F7E05

      WAVEFORM 3:

      Table 3. Heated Oxygen Sensor
      Terminal No. (Symbol) Tool Setting Condition
      C45-114 (OX1B) - C45-115 (EX1B) 0.2 V/DIV., 200 msec./DIV. Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor
      C45-112 (OX2B) - C45-113 (EX2B) 0.2 V/DIV., 200 msec./DIV. Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor
      Tip:

      In the Data List, item O2S B1S2 or O2S B2S2 shows the ECM input values from the heated oxygen sensor.

    4. A015641E04

      WAVEFORM 4:

      Table 4. Injector No. 1 (to No. 8) Injection Signal
      Terminal No. (Symbol) Tool Setting Condition
      C45-86 (#10) - C45-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C45-109 (#20) - C45-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C45-85 (#30) - C45-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C45-108 (#40) - C45-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C45-84 (#50) - C45-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C45-107 (#60) - C45-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C45-83 (#70) - C45-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C45-106 (#80) - C45-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      Tip:

      The wavelength becomes shorter as the engine speed increases.

    5. A0156HDE03

      WAVEFORM 5:

      Table 5. Knock Sensor
      Terminal No. (Symbol) Tool Setting Condition
      C45-94 (KNK1) - C45-93 (EKNK) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine
      C45-117 (KNK2) - C45-116 (EKN2) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine
      C45-96 (KNK3) - C45-95 (EKN3) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine
      C45-119 (KNK4) - C45-118 (EKN4) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine
      Tip:

      • The wavelength becomes shorter as the engine speed increases.

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

    6. A0156UQE03

      WAVEFORM 6:

      Table 6. Crankshaft Position Sensor and VVT Sensor for Intake Side
      Terminal No. (Symbol) Tool Setting Condition
      (a) C45-110 (NE+) - C45-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      (b) C45-92 (VV1+) - C45-91 (VV1-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      (c) C45-87 (VV2+) - C45-88 (VV2-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      Tip:

      The wavelength becomes shorter as engine speed increases.

    7. A01577AE14

      WAVEFORM 7:

      Table 7. Igniter IGT Signal (from ECM to Igniter) and Igniter IGF Signal (from Igniter to ECM)
      Terminal No. (Symbol) Tool Setting Condition
      (a) C45-40 (IGT1) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C45-33 (IGT2) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C45-37 (IGT3) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C45-34 (IGT4) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C45-35 (IGT5) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C45-36 (IGT6) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C45-38 (IGT7) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C45-39 (IGT8) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (b) C45-104 (IGF1) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (b) C45-105 (IGF2) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      Tip:

      The wavelength becomes shorter as engine speed increases.

    8. A015E7NE22

      WAVEFORM 8:

      Table 8. Purge VSV
      Terminal No. (Symbol) Tool Setting Condition
      C45-63 (PRG) - C45-81 (E1) 10 V/DIV., 20 msec./DIV. Idling
      Tip:

      If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

    9. A01566DE01

      WAVEFORM 9:

      Table 9. Vehicle Speed Signal
      Terminal No. (Symbol) Tool Setting Condition
      A38-13 (SPD) - C45-81 (E1) 2 V/DIV., 20 msec./DIV. Driving at 20 km/h (12 mph)
      Tip:

      The wavelength becomes shorter as the vehicle speed increases.

    10. A0155GBE21

      WAVEFORM 10:

      Table 10. Throttle Actuator Positive Terminal
      Terminal No. (Symbol) Tool Setting Condition
      C45-19 (M+) - C45-82 (ME01) 5 V/DIV., 1 msec./DIV. Idling with warm engine
      Tip:

      The duty ratio varies depending on the throttle actuator operation.

    11. A015BRZE03

      WAVEFORM 11:

      Table 11. Throttle Actuator Negative Terminal
      Terminal No. (Symbol) Tool Setting Condition
      C45-18 (M-) - C45-82 (ME01) 5 V/DIV., 1 msec./DIV. Idling with warm engine
      Tip:

      The duty ratio varies depending on the throttle actuator operation.

    12. A0157TVE01

      WAVEFORM 12:

      Table 12. Engine Speed Signal
      Terminal No. (Symbol) Tool Setting Condition
      A38-15 (TACH) - C45-81 (E1) 5 V/DIV., 10 msec./DIV. Idling
      Tip:

      The wavelength becomes shorter as the engine speed increases.

    13. A015A69E24

      WAVEFORM 13:

      Table 13. CAN Communication Signal (Reference)
      Terminal No. (Symbol) Tool Setting Condition
      A38-10 (CANH) - C45-81 (E1) 1 V/DIV., 10 μsec./DIV. Engine stops and engine switch on (IG)
      Tip:

      The waveform varies depending on the CAN communication signal.

    14. A0159BAE25

      WAVEFORM 14:

      Table 14. CAN Communication Signal (Reference)
      Terminal No. (Symbol) Tool Setting Condition
      A38-11 (CANL) - C45-81 (E1) 1 V/DIV., 10 μsec./DIV. Engine stops and engine switch on (IG)
      Tip:

      The waveform varies depending on the CAN communication signal.

    15. A015683E03

      WAVEFORM 15:

      Table 15. Crankshaft Position Sensor and Camshaft Position Sensor
      Terminal No. (Symbol) Tool Setting Condition
      CH1: C45-110 (NE+) - C45-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      CH2: C45-90 (G2) - C45-89 (G2-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      Tip:

      The wavelength becomes shorter as the engine speed increases.

    16. A01555YE03

      WAVEFORM 16:

      Table 16. Crankshaft Position Sensor and VVT Sensor for Exhaust Side
      Terminal No. (Symbol) Tool Setting Condition
      (a) C45-110 (NE+) - C45-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      (b) C45-69 (EV1+) - C45-68 (EV1-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      (c) C45-64 (EV2+) - C45-65 (EV2-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      Tip:

      The wavelength becomes shorter as engine speed increases.