SFI SYSTEM TERMINALS OF ECM


  1. CHECK ECM

    A01EO9JE12

    1. Measure the voltage according to the value(s) in the table below.

      Tech Tips

      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. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      A53-1 (BATT) - C54-81 (E1) L - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
      C54-41 (+BM) - C54-81 (E1) P - BR Power source of throttle actuator Always 11 to 14 V
      A53-28 (IGSW) - C54-81 (E1) B - BR Engine switch Engine switch on (IG) 11 to 14 V
      A53-3 (+B) - C54-81 (E1) B - BR Power source of ECM Engine switch on (IG) 11 to 14 V
      A53-2 (+B2) - C54-81 (E1) B - BR Power source of ECM Engine switch on (IG) 11 to 14 V
      C54-58 (OC1+) - C54-57 (OC1-) B - B-L Camshaft timing oil control valve (OCV) (for Intake Side of Bank 1) Idling

      Pulse generation

      (see waveform 1)
      C54-52 (OC2+) - C54-51 (OC2-) L-B - R-B Camshaft timing oil control valve (OCV) (for Intake Side of Bank 2) Idling

      Pulse generation

      (see waveform 1)
      C54-56 (OE1+) - C54-55 (OE1-) L-W - L-B Camshaft timing oil control valve (OCV) (for Exhaust Side of Bank 1) Idling

      Pulse generation

      (see waveform 1)
      C54-50 (OE2+) - C54-49 (OE2-) L-R - L-B Camshaft timing oil control valve (OCV) (for Exhaust Side of Bank 2) Idling

      Pulse generation

      (see waveform 1)
      A53-34 (MREL) - C54-81 (E1) V - BR EFI relay Engine switch on (IG) 11 to 14 V
      C54-74 (VG) - C54-75 (E2G) L-Y - G-W Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
      C54-73 (THA) - C54-98 (E2) Y-B - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
      C54-76 (THW) - C54-98 (E2) G-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
      C54-80 (VCTA) - C54-79 (ETA) Y - L Power source of throttle position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
      C54-78 (VTA1) - C54-79 (ETA) R-Y - L Throttle position sensor (for engine control)

      Engine switch on (IG),

      Throttle valve fully closed

      		 0.5 to 1.2 V

      Engine switch on (IG),

      Throttle valve fully open

      		 3.2 to 4.8 V
      C54-77 (VTA2) - C54-79 (ETA) Y-B - L Throttle position sensor (for sensor malfunction detection)

      Engine switch on (IG),

      Throttle valve fully closed

      		 2.1 to 3.1 V

      Engine switch on (IG),

      Throttle valve fully open

      		 4.5 to 5.5 V
      A53-55 (VPA) - A53-58 (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
      A53-56 (VPA2) - A53-60 (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 5.3 V
      A53-57 (VCPA) - A53-58 (EPA) L - W Power source of accelerator pedal position sensor (for VPA) Engine switch on (IG) 4.5 to 5.5 V
      A53-59 (VCP2) - A53-60 (EPA2) V - BE Power source of accelerator pedal position sensor (for VPA2) Engine switch on (IG) 4.5 to 5.5 V
      C54-22 (HA1A) - C54-23 (E04) L - W-B A/F sensor heater Idling Below 3.0 V
      Engine switch on (IG) 11 to 14 V
      C54-20 (HA2A) - C54-21 (E05) G - W-B A/F sensor heater Idling Below 3.0 V
      Engine switch on (IG) 11 to 14 V
      C54-126 (A1A+) - C54-81 (E1) G -BR A/F sensor Engine switch on (IG) 3.3 V*1
      C54-125 (A1A-) - C54-81 (E1) R - BR A/F sensor Engine switch on (IG) 2.9 V*1
      C54-103 (A2A+) - C54-81 (E1) P - BR A/F sensor Engine switch on (IG) 3.3 V*1
      C54-102 (A2A-) - C54-81 (E1) L - BR A/F sensor Engine switch on (IG) 2.9 V*1
      C54-45 (HT1B) - C54-46 (E03) G-B - W-B Heated oxygen sensor heater Idling Below 3.0 V
      Engine switch on (IG) 11 to 14 V
      C54-44 (HT2B) - C54-46 (E03) B - W-B Heated oxygen sensor heater Idling Below 3.0 V
      Engine switch on (IG) 11 to 14 V
      C54-114 (OX1B) - C54-115 (EX1B) G - L Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

      Pulse generation

      (see waveform 2)
      C54-112 (OX2B) - C54-113 (EX2B) R - W Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

      Pulse generation

      (see waveform 2)
      C54-86 (#10) - C54-43 (E01) R-L - W-B Injector Engine switch on (IG) 11 to 14 V
      Idling

      Pulse generation

      (see waveform 3)
      C54-109 (#20) - C54-43 (E01) L - W-B Injector Engine switch on (IG) 11 to 14 V
      Idling

      Pulse generation

      (see waveform 3)
      C54-85 (#30) - C54-43 (E01) R-B - W-B Injector Engine switch on (IG) 11 to 14 V
      Idling

      Pulse generation

      (see waveform 3)
      C54-108 (#40) - C54-43 (E01) Y - W-B Injector Engine switch on (IG) 11 to 14 V
      Idling

      Pulse generation

      (see waveform 3)
      C54-84 (#50) - C54-43 (E01) G - W-B Injector Engine switch on (IG) 11 to 14 V
      Idling

      Pulse generation

      (see waveform 3)
      C54-107 (#60) - C54-43 (E01) R - W-B Injector Engine switch on (IG) 11 to 14 V
      Idling

      Pulse generation

      (see waveform 3)
      C54-83 (#70) - C54-43 (E01) W - W-B Injector Engine switch on (IG) 11 to 14 V
      Idling

      Pulse generation

      (see waveform 3)
      C54-106 (#80) - C54-43 (E01) R-B - W-B Injector Engine switch on (IG) 11 to 14 V
      Idling

      Pulse generation

      (see waveform 3)
      C54-94 (KNK1) - C54-93 (EKNK) R - G Knock sensor Engine speed maintained at 4000 rpm after warming up engine

      Pulse generation

      (see waveform 4)
      C54-117 (KNK2) - C54-116 (EKN2) W - B Knock sensor Engine speed maintained at 4000 rpm after warming up engine

      Pulse generation

      (see waveform 4)
      C54-96 (KNK3) - C54-95 (EKN3) W - B Knock sensor Engine speed maintained at 4000 rpm after warming up engine

      Pulse generation

      (see waveform 4)
      C54-119 (KNK4) - C54-118 (EKN4) R - G Knock sensor Engine speed maintained at 4000 rpm after warming up engine

      Pulse generation

      (see waveform 4)
      C54-92 (VV1+) - C54-91 (VV1-) R - Y Variable valve timing (VVT) sensor (for Intake Side of Bank 1) Idling

      Pulse generation

      (see waveform 5)
      C54-87 (VV2+) - C54-88 (VV2-) R - Y Variable valve timing (VVT) sensor (for Intake Side for Bank 2) Idling

      Pulse generation

      (see waveform 5)
      C54-69 (EV1+) - C54-68 (EV1-) R-L - Y Variable valve timing (VVT) sensor (for Exhaust Side of Bank 1) Idling

      Pulse generation

      (see waveform 16)
      C54-64 (EV2+) - C54-65 (EV2-) R-L - Y Variable valve timing (VVT) sensor (for Exhaust Side of Bank 2) Idling

      Pulse generation

      (see waveform 16)
      C54-110 (NE+) - C54-111 (NE-) W - Y Crankshaft position sensor Idling

      Pulse generation

      (see waveform 5)
      C54-40 (IGT1) - C54-81 (E1) B-Y - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (see waveform 6)
      C54-33 (IGT2) - C54-81 (E1) L-B - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (see waveform 6)
      C54-37 (IGT3) - C54-81 (E1) B - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (see waveform 6)
      C54-34 (IGT4) - C54-81 (E1) L-B - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (see waveform 6)
      C54-35 (IGT5) - C54-81 (E1) G-R - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (see waveform 6)
      C54-36 (IGT6) - C54-81 (E1) G - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (see waveform 6)
      C54-38 (IGT7) - C54-81 (E1) G-W - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (see waveform 6)
      C54-39 (IGT8) - C54-81 (E1) G-B - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (see waveform 6)
      C54-104 (IGF1) - C54-81 (E1) G-B - BR Ignition coil (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V
      Idling

      Pulse generation

      (see waveform 6)
      C54-105 (IGF2) - C54-81 (E1) R - BR Ignition coil (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V
      Idling

      Pulse generation

      (see waveform 6)
      C54-63 (PRG) - C54-81 (E1) L-B - BR Purge VSV Engine switch on (IG) 11 to 14 V
      Idling

      Pulse generation

      (see waveform 7)
      A53-13 (SPD) - C54-81 (E1) V - BR Speed signal from combination meter Driving at 20 km/h (12 mph)

      Pulse generation

      (see waveform 8)
      A53-46 (STA) - C54-81 (E1) R - BR Starter signal Cranking 5.5 V or more
      C54-120 (NSW) - C54-81 (E1) L - BR Park / neutral position switch Engine switch on (IG), Shift lever position other than P and N 11 to 14 V
      Engine switch on (IG), Shift lever position in P or N Below 3.0 V
      A53-36 (STP) - C54-81 (E1) R - BR Stop light switch Brake pedal depressed 7.5 to 14 V
      Brake pedal released Below 1.5 V
      A53-35 (ST1-) - C54-81 (E1) P - BR

      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
      C54-19 (M+) - C54-82 (ME01) R - W-B Throttle actuator Idling with warm engine

      Pulse generation

      (see waveform 9)
      C54-18 (M-) - C54-82 (ME01) G - W-B Throttle actuator Idling with warm engine

      Pulse generation

      (see waveform 10)
      A53-52 (FPC) - C54-81 (E1) W - BR Fuel pump control Engine switch on (IG) Below 1.5 V
      A53-24 (W) - C54-81 (E1) R - BR MIL Engine switch on (IG) Below 3.0 V
      Idling 11 to 14 V
      A53-16 (TC) - C54-81 (E1) V - BR Terminal TC of DLC3 Engine switch on (IG) 11 to 14 V
      A53-15 (TACH) - C54-81 (E1) W - BR Engine speed Idling

      Pulse generation

      (see waveform 11)
      C54-67 (VCV1) - C54-98 (E2) L - BR Power source for sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
      C54-66 (VCV2) - C54-98 (E2) L - BR Power source for sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
      C54-32 (ALT) - C54-81 (E1) R - BR Generator Engine switch on (IG) 11 to 14 V
      A53-10 (CANH) - C54-81 (E1) P - BR CAN communication line Engine switch on (IG)

      Pulse generation

      (see waveform 12)
      A53-11 (CANL) - C54-81 (E1) B - BR CAN communication line Engine switch on (IG)

      Pulse generation

      (see waveform 13)
      C54-62 (ACIS) - C54-81 (E1) L-Y - BR VSV for ACIS (Acoustic Control Induction System) operation signal Engine switch on (IG) 11 to 14 V
      C54-28 (AIRV) - C54-81 (E1) BR - BR Air switching valve signal for secondary air injection system Engine switch on (IG) 11 to 14 V
      C54-54 (AIRP) - C54-81 (E1) P - BR Air pump control signal for secondary air injection system Engine switch on (IG) 11 to 14 V
      C54-30 (AIDI) - C54-81 (E1) G - BR Diagnostic information signal for secondary air injection system Secondary air injection system operates

      Pulse generation

      (see waveform 15)
      A53-54 (AIP) - C54-98 (E2) P - BR Secondary air injection system pressure signal Engine switch on (IG) 3.0 to 3.6 V
      A53-53 (AIP2) - C54-98 (E2) R - BR Secondary air injection system pressure signal Engine switch on (IG) 3.0 to 3.6 V
      C54-60 (HAI1) - C54-81 (E1) G - BR Air pump heater for secondary air injection system AI heater operating 11 to 14 V
      C54-61 (AIR) - C54-81 (E1) R - BR Air pump for secondary air injection system AI operating 11 to 14 V
      C54-90 (G2) - C54- 89 (G2-) G - Y Camshaft position sensor Idling

      Pulse generation

      (see waveform 14)
      A53-14 (STSW) - C54-81 (E1) R - BR Starter switch Shift lever position P or N, Cranking 6.0 V or more
      A53-41 (ACCR) - C54-81 (E1) L-Y - BR ACC relay control signal Engine switch on (IG) → Cranking 11 to 14 V → Below 1 V
      C54-16 (STAR) - C54-81 (E1) L - BR Starter relay control Engine switch on (IG) Below 1.5 V
      Cranking 5.5 V or more
      C54-72 (PSP) - C54-81 (E1) G - BR Power steering oil pressure switch Engine switch on (IG) 0.5 to 4.5 V

      Tech Tips


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

    2. A01EPH2E02

      WAVEFORM 1:

      Camshaft timing oil control valve (OCV)
      Terminal No. (Symbols) Tool Setting Condition
      C54-58 (OC1+) - C54-57 (OC1-) 5 V/DIV., 1 msec./DIV. Idling
      C54-52 (OC2+) - C54-51 (OC2-) 5 V/DIV., 1 msec./DIV. Idling
      C54-56 (OE1+) - C54-55 (OE1-) 5 V/DIV., 1 msec./DIV. Idling
      C54-50 (OE2+) - C54-49 (OE2-) 5 V/DIV., 1 msec./DIV. Idling
    3. A01EQD4E05

      WAVEFORM 2:

      Heated oxygen sensor
      Terminal No. (Symbols) Tool Setting Condition
      C54-114 (OX1B) - C54-115 (EX1B) 0.2 V/DIV., 200 msec./DIV. Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor
      C54-112 (OX2B) - C54-113 (EX2B) 0.2 V/DIV., 200 msec./DIV. Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

      Tech Tips

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

    4. A01EO1TE04

      WAVEFORM 3:

      Injector No. 1 (to No. 8) injection signal
      Terminal No. (Symbols) Tool Setting Condition
      C54-86 (#10) - C54-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C54-109 (#20) - C54-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C54-85 (#30) - C54-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C54-108 (#40) - C54-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C54-84 (#50) - C54-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C54-107 (#60) - C54-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C54-83 (#70) - C54-43 (E01) 20 V/DIV., 20 msec./DIV. Idling
      C54-106 (#80) - C54-43 (E01) 20 V/DIV., 20 msec./DIV. Idling

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

    5. A01EOOUE03

      WAVEFORM 4:

      Knock sensor
      Terminal No. (Symbols) Tool Setting Condition
      C54-94 (KNK1) - C54-93 (EKNK) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine
      C54-117 (KNK2) - C54-116 (EKN2) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine
      C54-96 (KNK3) - C54-95 (EKN3) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine
      C54-119 (KNK4) - C54-118 (EKN4) 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 rpm after warming up engine

      Tech Tips


      • The wavelength becomes shorter as the engine rpm increases.

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

    6. A01EQMME01

      WAVEFORM 5:

      Crankshaft position sensor and VVT sensor for intake side
      Terminal No. (Symbols) Tool Setting Condition
      (a) C54-110 (NE+) - C54-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      (b) C54-92 (VV1+) - C54-91 (VV1-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      (c) C54-87 (VV2+) - C54-88 (VV2-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up

      Tech Tips

      The wavelength becomes shorter as engine rpm increases.

    7. A01EORXE14

      WAVEFORM 6:

      Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from igniter to ECM)
      Terminal No. (Symbols) Tool Setting Condition
      (a) C54-40 (IGT1) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C54-33 (IGT2) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C54-37 (IGT3) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C54-34 (IGT4) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C54-35 (IGT5) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C54-36 (IGT6) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C54-38 (IGT7) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) C54-39 (IGT8) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (b) C54-104 (IGF1) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (b) C54-105 (IGF2) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Idling

      Tech Tips

      The wavelength becomes shorter as engine rpm increases.

    8. A01EQYTE03

      WAVEFORM 7:

      Purge VSV
      Terminal No. (Symbols) Tool Setting Condition
      C54-63 (PRG) - C54-81 (E1) 10 V/DIV., 10 to 100 msec./DIV. Idling

      Tech Tips

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

    9. A01ERU8E01

      WAVEFORM 8:

      Vehicle speed signal
      Terminal No. (Symbols) Tool Setting Condition
      A53-13 (SPD) - C54-81 (E1) 2 V/DIV., 20 msec./DIV. Driving at 20 km/h (12 mph)

      Tech Tips

      The wavelength becomes shorter as the vehicle speed increases.

    10. A01EOMWE06

      WAVEFORM 9:

      Throttle actuator positive terminal
      Terminal No. (Symbols) Tool Setting Condition
      C54-19 (M+) - C54-82 (ME01) 5 V/DIV., 1 msec./DIV. Idling with warm engine

      Tech Tips

      The duty ratio varies depending on the throttle actuator operation.

    11. A01EO9IE04

      WAVEFORM 10:

      Throttle actuator negative terminal
      Terminal No. (Symbols) Tool Setting Condition
      C54-18 (M-) - C54-82 (ME01) 5 V/DIV., 1 msec./DIV. Idling with warm engine

      Tech Tips

      The duty ratio varies depending on the throttle actuator operation.

    12. A01EQG7E01

      WAVEFORM 11:

      Engine speed signal
      Terminal No. (Symbols) Tool Setting Condition
      A53-15 (TACH) - C54-81 (E1) 5 V/DIV., 10 msec./DIV. Idling

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

    13. A01EOFIE24

      WAVEFORM 12:

      CAN communication signal
      Terminal No. (Symbols) Tool Setting Condition
      A53-10 (CANH) - C54-81 (E1) 1 V/DIV., 10 μsec./DIV. Engine stops and Engine switch on (IG)

      Tech Tips

      The waveform varies depending on the CAN communication signal.

    14. A01EOBCE25

      WAVEFORM 13:

      CAN communication signal
      Terminal No. (Symbols) Tool Setting Condition
      A53-11 (CANL) - C54-81 (E1) 1 V/DIV., 10 μsec./DIV. Engine stops and Engine switch on (IG)

      Tech Tips

      The waveform varies depending on the CAN communication signal.

    15. A01ERK5E01

      WAVEFORM 14:

      Crankshaft position sensor and camshaft position sensor
      Terminal No. (Symbols) Tool Setting Condition
      CH1: C54-110 (NE+) - C54-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      CH2: C54-90 (G2) - C54-89 (G2-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up

      Tech Tips

      The wavelength becomes shorter as the engine rpm increases.

    16. A01ENRVE06

      WAVEFORM 15:

      Terminal DI of air injection control driver
      Terminal No. (Symbols) Tool Setting Condition
      C54-30 (AIDI) - C54-81 (E1) 5 V/DIV., 50 msec./DIV. Performing system check using GTS (secondary air injection check)

      Tech Tips

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

    17. A01ENPLE01

      WAVEFORM 16:

      Crankshaft position sensor and VVT sensor for exhaust side
      Terminal No. (Symbols) Tool Setting Condition
      (a) C54-110 (NE+) - C54-111 (NE-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      (b) C54-69 (EV1+) - C54-68 (EV1-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up
      (c) C54-64 (EV2+) - C54-65 (EV2-) 5 V/DIV., 20 msec./DIV. Idle after engine warmed up

      Tech Tips

      The wavelength becomes shorter as engine rpm increases.