SFI SYSTEM TERMINALS OF ECM


  1. CHECK ECM

    A01DTEIE07

    1. Measure the voltage of the ECM connectors.

      Tech Tips

      The standard 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 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
      G55-24 (BATT) - C36-12 (E1) L - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
      C36-23 (+BM) - C36-12 (E1) GR - BR Power source of throttle actuator Always 11 to 14 V
      G56-21 (IGSW) - C36-12 (E1) W - BR Ignition switch Ignition switch ON 11 to 14 V
      G55-22 (+B) - C36-12 (E1) W - BR Power source of ECM Ignition switch ON 11 to 14 V
      G55-23 (+B2) - C36-12 (E1) W - BR Power source of ECM Ignition switch ON 11 to 14 V
      C35-19 (OC1+) - C35-20 (OC1-) G-Y - L-B Camshaft timing oil control valve assembly (for Intake Side of Bank 1) Ignition switch ON Pulse generation (see waveform 1)
      C34-19 (OC2+) - C34-20 (OC2-) L-W - L-R Camshaft timing oil control valve assembly (for Intake Side of Bank 2) Ignition switch ON

      Pulse generation

      (see waveform 1)
      C35-21 (OE1+) - C35-22 (OE1-) G-B - B-R Camshaft timing oil control valve assembly (for Exhaust Side of Bank 1) Ignition switch ON

      Pulse generation

      (see waveform 1)
      C34-21 (OE2+) - C34-22 (OE2-) W-G - L Camshaft timing oil control valve assembly (for Exhaust Side of Bank 2) Ignition switch ON

      Pulse generation

      (see waveform 1)
      G55-9 (MREL) - C36-12 (E1) V - BR EFI relay Ignition switch ON 11 to 14 V
      C35-14 (VG) - C35-13 (E2G) W-R - B-W Mass air flow meter Idling, shift lever in P or N, A/C switch off 0.5 to 3.0 V
      C35-15 (THA) - C35-7 (ETHA) Y-B - W-R Intake air temperature sensor Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
      C36-17 (THW) - C35-8 (ETHW) R-L - W-R Engine coolant temperature sensor Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
      C36-13 (VCTA) - C36-14 (ETA) L - W Power source for throttle position sensor (fixed voltage) Ignition switch ON 4.5 to 5.5 V
      C36-15 (VTA1) - C36-14 (ETA) LG - W Throttle position sensor (for engine control)

      Ignition switch ON,

      throttle valve fully closed

      		 0.5 to 1.1 V

      Ignition switch ON,

      throttle valve fully open

      		 3.3 to 4.9 V
      C36-16 (VTA2) - C36-14 (ETA) G-W - W Throttle position sensor (for sensor malfunction detection)

      Ignition switch ON,

      throttle valve fully closed

      		 2.1 to 3.1 V

      Ignition switch ON,

      throttle valve fully open

      		 4.6 to 5.0 V
      G56-6 (VPA) - G56-3 (EPA) L - P Accelerator pedal position sensor (for engine control)

      Ignition switch ON,

      accelerator pedal released

      		 0.5 to 1.1 V

      Ignition switch ON,

      accelerator pedal fully depressed

      		 2.6 to 4.5 V
      G56-5 (VPA2) - G56-1 (EPA2) GR - W Accelerator pedal position sensor (for sensor malfunction detection)

      Ignition switch ON,

      accelerator pedal released

      		 1.2 to 2.0 V

      Ignition switch ON,

      accelerator pedal fully depressed

      		 3.4 to 4.75 V
      G56-4 (VCPA) - G56-3 (EPA) LG - P Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
      G56-2 (VCP2) - G56-1 (EPA2) R - W Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V

      C37-17 (HA1A) - C37-16 (E04)

      C37-19 (HA2A) - C37-16 (E04)

      R-L - W-B

      B-W - W-B

      		 Air fuel ratio sensor heater Idling Below 3.0 V
      Ignition switch ON 11 to 14 V
      C36-1 (A1A+) - C36-12 (E1) P -BR Air fuel ratio sensor Ignition switch ON 3.3 V*
      C36-2 (A1A-) - C36-12 (E1) L - BR Air fuel ratio sensor Ignition switch ON 3.0 V*
      C36-7 (A2A+) - C36-12 (E1) Y - BR Air fuel ratio sensor Ignition switch ON 3.3 V*
      C36-8 (A2A-) - C36-12 (E1) L - BR Air fuel ratio sensor Ignition switch ON 3.0 V*

      C37-12 (HT1B) - C37-11 (E03)

      C37-13 (HT2B) - C37-11 (E03)

      L-R - W-B

      L - W-B

      		 Heated oxygen sensor heater Idling Below 3.0 V
      Ignition switch ON 11 to 14 V

      C34-2 (OX1B) - C34-1 (EX1B)

      C34-4 (OX2B) - C34-3 (EX2B)

      B - L-W

      B - GR

      		 Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor Pulse generation (see waveform 2)

      C37-6 (#10) - C37-14 (E01)

      C37-1 (#20) - C37-14 (E01)

      C37-7 (#30) - C37-14 (E01)

      C37-2 (#40) - C37-14 (E01)

      C37-8 (#50) - C37-14 (E01)

      C37-3 (#60) - C37-14 (E01)

      L - W-B

      B - W-B

      R - W-B

      G - W-B

      Y - W-B

      R-L - W-B

      		 Fuel injector assembly Ignition switch ON 11 to 14 V
      Idling Pulse generation (see waveform 3)

      C35-11 (KNK1) - C35-12 (EKNK)

      C35-5 (KNK2) - C35-6 (EKN2)

      B - W

      G - R

      		 Knock sensor Engine speed maintained at 4000 rpm after warming up engine Pulse generation (see waveform 4)
      C34-15 (VCV1) - C36-12 (E1) P-L - BR Power source for sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
      C34-16 (VCV2) - C36-12 (E1) LG-B - BR Power source for sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
      C34-9 (VV1+) - C34-10 (VV1-) R - G VVT sensor (for Intake Side of Bank 1) Idling

      Pulse generation

      (see waveform 5)
      C34-12 (VV2+) - C34-11 (VV2-) G - GR VVT Sensor (for Intake Side of Bank 2) Idling

      Pulse generation

      (see waveform 5)
      C34-13 (EV1+) - C34-14 (EV1-) W-R - R-B VVT Sensor (for Exhaust Side of Bank 1) Idling

      Pulse generation

      (see waveform 6)
      C34-18 (EV2+) - C34-17 (EV2-) L - P VVT Sensor (for Exhaust Side of Bank 2) Idling

      Pulse generation

      (see waveform 6)
      C34-6 (NE+) - C34-5 (NE-) B - W Crankshaft position sensor Idling Pulse generation (see waveform 5)

      C36-24 (IGT1) - C36-12 (E1)

      C36-25 (IGT2) - C36-12 (E1)

      C36-26 (IGT3) - C36-12 (E1)

      C36-27 (IGT4) - C36-12 (E1)

      C36-28 (IGT5) - C36-12 (E1)

      C35-25 (IGT6) - C36-12 (E1)

      R-Y - BR

      R-L - BR

      G-B - BR

      G-W - BR

      GR - BR

      L - BR

      		 Ignition coil assembly (ignition signal) Idling Pulse generation (see waveform 7)
      C36-6 (IGF1) - C36-12 (E1) G-R - BR Ignition coil assembly (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
      Idling Pulse generation (see waveform 7)
      C36-18 (PRG) - C36-12 (E1) P - BR Purge VSV Ignition switch ON 11 to 14 V
      Idling Pulse generation (see waveform 8)
      G55-18 (SPD) - C36-12 (E1) R - BR Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph) Pulse generation (see waveform 9)
      G56-10 (STA) - C36-12 (E1) W - BR Starter signal Cranking 5.5 V or more
      C35-2 (NSW) - C36-12 (E1) B - BR Starter relay control Ignition switch ON Below 1.5 V
      Cranking 6.0 V or more
      G56-18 (STP) - C36-12 (E1) V - BR Stop light switch Brake pedal depressed 7.5 to 14 V
      Brake pedal released Below 1.5 V
      G55-8 (ST1-) - C36-12 (E1) B - BR

      Stop light switch

      (opposite to voltage at STP terminal)

      Ignition switch ON,

      Brake pedal depressed

      		 Below 1.5 V

      Ignition switch ON,

      Brake pedal released

      		 7.5 to 14 V
      C37-20 (M+) - C37-10 (ME01) P - W-B Throttle actuator Idling with warm engine Pulse generation (see waveform 10)
      C36-29 (M-) - C37-10 (ME01) L - W-B Throttle actuator Idling with warm engine Pulse generation (see waveform 11)
      G56-8 (FC) - C36-12 (E1) G - BR Fuel pump control Idling Below 1.5 V
      G55-3 (FPC) - C36-12 (E1) G - BR Fuel pump control Ignition switch ON Below 1.5 V
      G56-26 (DI) - C36-12 (E1) GR - BR Fuel pump control Ignition switch ON 0 to 3.0 V
      C35-16 (PSP) - C36-12 (E1) V - BR Power steering oil pressure sensor Ignition switch ON 0.5 to 4.5 V
      G55-1 (AIP) - C35-7 (ETHA) V - W-R Secondary air injection system pressure signal Ignition switch ON 3.0 to 3.6 V
      G55-2 (AIP2) - C35-7 (ETHA) B - W-R Secondary air injection system pressure signal Ignition switch ON 3.0 to 3.6 V
      C35-30 (AIDI) - C36-12 (E1) G - BR Air switching valve for secondary air injection system Air injection system operates Pulse generation (see waveform 12)
      C34-26 (AIRV) - C36-12 (E1) P - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
      C35-23 (AIRP) - C36-12 (E1) GR - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
      C36-21 (AIR1) - C36-12 (E1) L - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
      C36-20 (HAI1) - C36-12 (E1) W - BR Air pump heater for secondary air injection system AI heater operating 11 to 14 V
      G55-13 (W) - C36-12 (E1) V - BR MIL Ignition switch ON Below 1.5 V
      Idling 11 to 14 V
      G56-28 (TC) - C36-12 (E1) V - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
      G56-29 (TACH) - C36-12 (E1) P - BR Engine speed Idling Pulse generation (see waveform 13)
      C35-28 (ALT) - C36-12 (E1) L - BR Generator Ignition switch ON 11 to 14 V
      G56-32 (CANH) - C36-12 (E1) R - BR CAN communication line Ignition switch ON Pulse generation (see waveform 14)
      G56-31 (CANL) - C36-12 (E1) W - BR CAN communication line Ignition switch ON Pulse generation (see waveform 15)
      G56-34 (CANP) - C36-12 (E1) BR - BR CAN communication line Ignition switch ON Pulse generation (see waveform 14)
      G56-33 (CANN) - C36-12 (E1) GR - BR CAN communication line Ignition switch ON Pulse generation (see waveform 15)

      Tech Tips

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

    2. A01DOZVE02

      Waveform 1

      Camshaft Timing Oil Control Valve Assembly
      Symbol

      Between OC1+ and OC1-

      Between OC2+ and OC2-

      Between OE1+ and OE1-

      Between OE2+ and OE2-
      Tester Range 5 V/DIV., 1 msec./DIV.
      Condition Idling
    3. A01DTXME05

      Waveform 2

      Heated Oxygen Sensor
      Symbol

      Between OX1B and EX1B

      Between OX2B and EX2B
      Tester Range 0.2 V/DIV., 200 msec./DIV.
      Condition Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

      Tech Tips

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

    4. A01DO3IE04

      Waveform 3

      Fuel Injector Assembly No. 1 (to No. 6) Injection Signal
      Symbol Between #10 (to #60) and E01
      Tester Range 20 V/DIV., 20 msec./DIV.
      Condition Idling

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

    5. A01DT8KE03

      Waveform 4

      Knock Sensor
      Symbol

      Between KNK1 and EKNK

      Between KNK2 and EKN2
      Tester Range 1 V/DIV., 1 msec./DIV.
      Condition Engine speed maintained at 4000 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.

    6. A01DT5LE04

      Waveform 5

      Crankshaft Position Sensor and VVT Sensor (for Intake Side)
      Symbol

      Between NE+ and NE-

      Between VV1+ and VV1-

      Between VV2+ and VV2-
      Tester Range 5 V/DIV., 20 msec./DIV.
      Condition Idling

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

    7. A01DSU5E04

      Waveform 6

      Crankshaft position sensor and VVT sensor (for Exhaust Side)
      Symbol

      Between NE+ and NE-

      Between EV1+ and EV1-

      Between EV2+ and EV2-
      Tester Range 5 V/DIV., 20 msec./DIV.
      Condition Idling

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

    8. A01DRHNE01

      Waveform 7

      Igniter IGT Signal (from ECM to Igniter) and Igniter IGF Signal (from Igniter to ECM)
      Symbol

      Between IGT (1 to 6) and E1

      Between IGF1 and E1
      Tester Range 2 V/DIV., 20 msec./DIV.
      Condition Idling

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

    9. A01DQRIE02

      Waveform 8

      Purge VSV
      Symbol Between PRG and E1
      Tester Range 10 V/DIV., 20 msec./DIV.
      Condition Idling

      Tech Tips

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

    10. A01DRYBE01

      Waveform 9

      Vehicle Speed Signal
      Symbol Between SPD and E1
      Tester Range 2 V/DIV., 20 msec./DIV.
      Condition Driving at 20 km/h (12 mph)

      Tech Tips

      The wavelength becomes shorter as the vehicle speed increases.

    11. A01DR5HE06

      Waveform 10

      Throttle Actuator Positive Terminal
      Symbol Between M+ and ME01
      Tester Range 5 V/DIV., 1 msec./DIV.
      Condition Idling with warm engine

      Tech Tips

      The duty ratio varies depending on the throttle actuator operation.

    12. A01DSUIE04

      Waveform 11

      Throttle Actuator Negative Terminal
      Symbol Between M- and ME01
      Tester Range 5 V/DIV., 1 msec./DIV.
      Condition Idling with warm engine

      Tech Tips

      The duty ratio varies depending on the throttle actuator operation.

    13. A01DRNVE03

      Waveform 12

      Terminal DI of Air Injection Control Driver
      Symbol Between AIDI and E1
      Tester Range 5 V/DIV., 20 msec./DIV.
      Condition Performing system check using intelligent tester (secondary air injection check)

      Tech Tips

      The wavelength changes when the air injection control driver detects malfunctions in the air injection system.

    14. A01DQHEE01

      Waveform 13

      Engine Speed Signal
      Symbol Between TACH and E1
      Tester Range 5 V/DIV., 10 msec./DIV.
      Condition Idling

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

    15. A01DSS4E01

      Waveform 14

      CAN Communication Signal
      Symbol

      Between CANH and E1

      Between CANP and E1
      Tester Range 1 V/DIV., 10 μsec./DIV.
      Condition Engine stopped and ignition switch ON

      Tech Tips

      The waveform varies depending on the CAN communication signal.

    16. A01DQ02E01

      Waveform 15

      CAN Communication Signal
      Symbol

      Between CANL and E1

      Between CANN and E1
      Tester Range 1 V/DIV., 10 μsec./DIV.
      Condition Engine stopped and ignition switch ON

      Tech Tips

      The waveform varies depending on the CAN communication signal.