SFI SYSTEM (w/ Secondary Air Injection System) TERMINALS OF ECM


  1. CHECK ECM

    A01J3W7E03

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

      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
      E8-3 (BATT) - E11-3 (E1) L - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
      E8-7 (+BM) - E11-3 (E1) R-W - BR Power source of throttle actuator Always 11 to 14 V
      E8-9 (IGSW) - E11-3 (E1) B-O - BR Ignition switch Ignition switch ON 11 to 14 V
      E8-1 (+B) - E11-3 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
      E11-13 (OC1+) - E11-12 (OC1-) P-L - Y Camshaft timing oil control valve Idling

      Pulse generation

      (See waveform 1)
      E8-8 (MREL) - E11-3 (E1) W-G - BR MAIN relay Ignition switch ON 11 to 14 V
      E10-28 (VG) - E10-30 (E2G) L-W - L-R Mass air flow meter Idling, shift lever in P or N, A/C off 0.5 to 3.0 V
      E10-29 (THA) - E11-28 (E2) L-B - BR Intake air temperature sensor Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
      E11-32 (THW) - E11-28 (E2) B - BR Engine coolant temperature sensor Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
      E11-18 (VC) - E11-28 (E2) LG-B - BR Power source of throttle position sensor (fixed voltage) Ignition switch ON 4.5 to 5.5 V
      E11-20 (VTA1) - E11-28 (E2) B-R - BR 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

      		 3.2 to 4.8 V
      E11-19 (VTA2) - E11-28 (E2) LG - BR 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
      E8-18 (VPA) - E8-20 (EPA) W-L - BR-W 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
      E8-19 (VPA2) - E8-21 (EPA2) GR-G - BR-Y 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 5.0 V
      E8-26 (VCPA) - E8-20 (EPA) LG-R - BR-W Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
      E8-27 (VCP2) - E8-21 (EPA2) BR-R - BR-Y Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
      E11-1 (HT1A) - E10-7 (E04) Y - W-B Air fuel ratio sensor heater Idling with warm engine

      Pulse generation

      (See waveform 2)
      E11-1 (HT1A) - E10-7 (E04) Y - W-B Air fuel ratio sensor heater Ignition switch ON 11 to 14 V
      E11-21 (A1A+) - E11-3 (E1) B -BR Air fuel ratio sensor Ignition switch ON 3.3 V*1
      E11-31 (A1A-) - E11-3 (E1) W - BR Air fuel ratio sensor Ignition switch ON 3.3 V*1
      E11-2 (HT1B) - E10-4 (E03) L-Y - W-B Heated oxygen sensor heater Idling Below 3.0 V
      E11-2 (HT1B) - E10-4 (E03) L-Y - W-B Heated oxygen sensor heater Ignition switch ON 11 to 14 V
      E11-25 (OX1B) - E11-28 (E2) B - BR Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

      Pulse generation

      (See waveform 3)
      E10-6 (#10) - E11-7 (E01) L - W-B Fuel injector Ignition switch ON 11 to 14 V
      Idling

      Pulse generation

      (See waveform 4)
      E10-5 (#20) - E11-7 (E01) G - W-B Fuel injector Ignition switch ON 11 to 14 V
      Idling

      Pulse generation

      (See waveform 4)
      E10-2 (#30) - E11-7 (E01) R - W-B Fuel injector Ignition switch ON 11 to 14 V
      Idling

      Pulse generation

      (See waveform 4)
      E10-1 (#40) - E11-7 (E01) W - W-B Fuel injector Ignition switch ON 11 to 14 V
      Idling

      Pulse generation

      (See waveform 4)
      E11-29 (KNK1) - E11-30 (EKNK) B - W Knock sensor Engine speed maintained at 4000 rpm after warming up engine

      Pulse generation

      (See waveform 5)
      E11-26 (G2) - E11-34 (NE-) R - G Camshaft position sensor Idling

      Pulse generation

      (See waveform 6)
      E11-27 (NE+) - E11-34 (NE-) L - G Crankshaft position sensor Idling

      Pulse generation

      (See waveform 6)
      E11-17 (IGT1) - E11-3 (E1) R - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (See waveform 7)
      E11-16 (IGT2) - E11-3 (E1) R-L - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (See waveform 7)
      E11-15 (IGT3) - E11-3 (E1) G-B - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (See waveform 7)
      E11-14 (IGT4) - E11-3 (E1) G - BR Ignition coil (ignition signal) Idling

      Pulse generation

      (See waveform 7)
      E11-23 (IGF1) - E11-3 (E1) G-R - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
      Idling

      Pulse generation

      (See waveform 7)
      E10-23 (PRG) - E11-3 (E1) L - BR Purge VSV Ignition switch ON 11 to 14 V
      Idling, under purge control

      Pulse generation

      (See waveform 8)
      E9-8 (SPD) - E11-3 (E1) V-R - BR Speed signal from combination meter Driving at 20 km/h (12 mph)

      Pulse generation

      (See waveform 9)
      E8-12 (STA) - E11-3 (E1)

      L-Y - BR*2

      B-Y - BR*3

      		 Starter signal Cranking 6.0 V or higher
      E8-30 (NSW) - E11-3 (E1)*3 L-Y - BR Park/neutral position switch Ignition switch ON, shift lever not in P or N 11 to 14 V
      Ignition switch ON, shift lever in P or N Below 3.0 V
      E9-4 (STP) - E11-3 (E1) G-W - BR Stop light switch Brake pedal depressed 7.5 to 14 V
      Brake pedal released Below 1.5 V
      E8-16 (ST1-) - E11-3 (E1) R-L - 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
      E11-5 (M+) - E10-3 (ME01) B - W-B Throttle actuator Idling with warm engine

      Pulse generation

      (See waveform 10)
      E11-4 (M-) - E10-3 (ME01) W - W-B Throttle actuator Idling with warm engine

      Pulse generation

      (See waveform 11)
      E8-25 (FC) - E11-3 (E1) LG-B - BR Fuel pump control Ignition switch ON 11 to 14 V
      E9-30 (W) - E11-3 (E1) R-B - BR MIL Ignition switch ON Below 3.0 V
      Idling 11 to 14 V
      E9-17 (TC) - E11-3 (E1) P-B - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
      E9-1 (TACH) - E11-3 (E1) B-W - BR Engine speed Idling

      Pulse generation

      (See waveform 12)
      E11-10 (ALT) - E11-3 (E1) G - BR Generator Ignition switch ON 11 to 14 V
      E8-15 (ELS) - E11-3 (E1) G - BR Electric load Taillight switch on 7.5 to 14 V
      Taillight switch off Below 1.5 V
      E9-3 (ELS3) - E11-3 (E1) B - BR Electric load Defogger switch on 7.5 to 14 V
      Defogger switch off Below 1.5 V
      E9-14 (THWO) - E11-3 (E1) P - BR Engine speed signal sent to combination meter Idling with warm engine Pulse generation
      E11-11 (AIRP) - E11-3 (E1) W-L - BR Air pump control Ignition switch on 11 to 14 V
      E10-20 (AIDI) - E11-3 (E1) G-W - BR Diagnostic information signal for secondary air injection system Secondary air injection system operating

      Pulse generation

      (See waveform 13)
      E11-24 (AIRV) - E11-3 (E1) V - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
      E9-32 (F/PS) - E11-3 (E1) B - BR Center airbag sensor assembly Ignition switch ON Pulse generation
      E10-32 (PSW) - E11-3 (E1) G-Y - BR Power steering oil pressure switch While turning steering wheel Below 1.5 V

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

      • *2: for Manual Transmission

      • *3: for Automatic Transmission

    2. A01J6V2E02

      Waveform 1:

      Camshaft Timing Oil Control Valve
      Terminal No. (Symbol) Tool Setting Condition
      E11-13 (OC1+) - E11-12 (OC1-) 5 V/DIV., 1 msec./DIV. Idling
    3. A01J38BE08

      Waveform 2:

      Air Fuel Ratio Sensor Heater
      Terminal No. (Symbol) Tool Setting Condition
      E11-1 (HT1A) - E10-7 (E04) 5 V/DIV., 10 msec./DIV. Idling with warm engine

      Tech Tips

      The wavelength varies in accordance with the engine operating conditions.

    4. A01J3A1E05

      Waveform 3:

      Heated Oxygen Sensor
      Terminal No. (Symbol) Tool Setting Condition
      E11-25 (OX1B) - E11-28 (E2) 0.2 V/DIV., 200 msec./DIV. Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

      Tech Tips

      In the Data List, item O2S B1 S2 shows the value from the heated oxygen sensor which is input to the ECM.

    5. A01J4STE04

      Waveform 4:

      Fuel Injector No. 1 (to No. 4) Injection Signal
      Terminal No. (Symbol) Tool Setting Condition
      E10-6 (#10) - E11-7 (E01) 20 V/DIV., 20 msec./DIV. Idling
      E10-5 (#20) - E11-7 (E01) 20 V/DIV., 20 msec./DIV. Idling
      E10-2 (#30) - E11-7 (E01) 20 V/DIV., 20 msec./DIV. Idling
      E10-1 (#40) - E11-7 (E01) 20 V/DIV., 20 msec./DIV. Idling

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

    6. A01J6VGE03

      Waveform 5:

      Knock Sensor
      Terminal No. (Symbol) Tool Setting Condition
      E11-29 (KNK1) - E11-30 (EKNK) 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 speed increases.

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

    7. A01J41UE46

      Waveform 6:

      Crankshaft Position Sensor and Camshaft Position Sensor
      Terminal No. (Symbol) Tool Setting Condition
      E11-27 (NE+) - E11-34 (NE-) 5 V/DIV., 20 msec./DIV. Idling after engine warmed up
      E11-26 (G2) - E11-34 (NE-) 5 V/DIV., 20 msec./DIV. Idling after engine warmed up

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

    8. A01J7O7E14

      Waveform 7:

      Igniter IGT Signal (from ECM to Igniter) and Igniter IGF Signal (from Igniter to ECM)
      Terminal No. (Symbol) Tool Setting Condition
      (a) E11-17 (IGT1) - E11-3 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) E11-16 (IGT2) - E11-3 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) E11-15 (IGT3) - E11-3 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (a) E11-14 (IGT4) - E11-3 (E1) 2 V/DIV., 20 msec./DIV. Idling
      (b) E11-23 (IGF1) - E11-3 (E1) 2 V/DIV., 20 msec./DIV. Idling

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

    9. A01J3G4E02

      Waveform 8:

      Purge VSV
      Terminal No. (Symbol) Tool Setting Condition
      E10-23 (PRG) - E11-3 (E1) 10 V/DIV., 20 msec./DIV. 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. A01J45QE01

      Waveform 9:

      Vehicle Speed Signal
      Terminal No. (Symbol) Tool Setting Condition
      E9-8 (SPD) - E11-3 (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.

    11. A01J5VKE06

      Waveform 10:

      Throttle Actuator Positive Terminal
      Terminal No. (Symbol) Tool Setting Condition
      E11-5 (M+) - E10-3 (ME01) 5 V/DIV., 1 msec./DIV. Idling with warm engine

      Tech Tips

      The duty ratio varies depending on the throttle actuator operation.

    12. A01J6EGE04

      Waveform 11:

      Throttle Actuator Negative Terminal
      Terminal No. (Symbol) Tool Setting Condition
      E11-4 (M-) - E10-3 (ME01) 5 V/DIV., 1 msec./DIV. Idling with warm engine

      Tech Tips

      The duty ratio varies depending on the throttle actuator operation.

    13. A01J6FVE01

      Waveform 12:

      Engine Speed Signal
      Terminal No. (Symbol) Tool Setting Condition
      E9-1 (TACH) - E11-3 (E1) 5 V/DIV., 10 msec./DIV. Idling

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

    14. A01J65DE01

      Waveform 13:

      Terminal DI of Air Injection Control Driver
      Terminal No. (Symbol) Tool Setting Condition
      E10-20 (AIDI) - E11-3 (E1) 5 V/DIV., 50 msec./DIV. 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 secondary air injection system Click here.