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Terminals Of ECM

Fig 1: Identifying Terminals Of ECM
G06079896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

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 STD Voltages column.

The illustration above can be used as a reference to identify the ECM terminal locations.

CONNECTOR TERMINAL WIRING COLOR REFERENCE

Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
E13-24 (BATT) - E11-12 (E1) L - BR Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
E11-23 (+BM) - E11-12 (E1) LG - BR Power source of throttle motor Always 11 to 14 V
E14-21 (IGSW) - E11-12 (E1) BE - BR Ignition switch Ignition switch ON 11 to 14 V
E13-22 (+B) - E11-12 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
E13-23 (+B2) - E11-12 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
E10-19 (OC1+) - E10-20 (OC1-) G-Y - L-B Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see waveform 1  1)
E9-19 (OC2+) - E9-20 (OC2-) G-B - L-R Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see waveform 1  1)
E13-9 (MREL) - E11-12 (E1) G-W - BR EFI relay Ignition switch ON 11 to 14 V
E9-15 (VCV1) - E10-8 (ETHW) L - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.0 V
E10-14 (VG) - E10-13 (E2G) R-Y - R-W Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
E10-15 (THA) - E10-7 (ETHA) R-L - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
E11-17 (THW) - E10-8 (ETHW) Y-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
E11-15 (VTA1) - E11-14 (ETA) G-B - W-B Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.1 V
E11-15 (VTA1) - E11-14 (ETA) G-B - W-B Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully open 3.3 to 4.9 V
E11-16 (VTA2) - E11-14 (ETA) V - W-B Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released 2.1 to 3.1 V
E11-16 (VTA2) - E11-14 (ETA) V - W-B Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully depressed 4.5 to 5.0 V
E14-6 (VPA) - E14-3 (EPA) R-Y - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released 0.5 to 1.1 V
E14-6 (VPA) - E14-3 (EPA) R-Y - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully depressed 2.6 to 4.5 V
E14-5 (VPA2) - E14-1 (EPA2) GR-B - R-B Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released 1.2 to 2.0 V
E14-5 (VPA2) - E14-1 (EPA2) GR-B - R-B Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully depressed 3.4 to 5.0 V
E14-4 (VCPA) - E14-3 (EPA) R-W - LG-B Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.0 V
E14-2 (VCP2) - E14-1 (EPA2) L-W - R-B Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.0 V
E12-17 (HA1A) - E12-16 (E04)
E12-19 (HA2A) - E12-18 (E05)		 R-W - W-B
B-W - W-B		 A/F sensor heater Idling with warm engine Pulse generation (see waveform 2  2)
Ignition switch ON 11 to 14 V
E12-17 (HA1A) - E12-16 (E04) R-W - W-B A/F sensor heater Ignition switch ON 11 to 14 V
E12-19 (HA2A) - E12-18 (E05) B-W - W-B
E11-1 (A1A+) - E11-12 (E1) P - BR A/F sensor Ignition switch ON 3.3 V(1)
E11-7 (A2A+) - E11-12 (E1) W - BR A/F sensor Ignition switch ON 3.3 V(1)
E11-2 (A1A-) - E11-12 (E1) L - BR A/F sensor Ignition switch ON 2.9 V(1)
E11-8 (A2A-) - E11-12 (E1) R - BR A/F sensor Ignition switch ON 2.9 V(1)
E12-12 (HT1B) - E12-11 (E03) G - W-B Heated oxygen sensor heater Idling Below 3.0 V
E12-13 (HT2B) - E12-11 (E03) L - W-B
E12-12 (HT1B) - E12-11 (E03) G - W-B Heated oxygen sensor heater Ignition switch ON 11 to 14 V
E12-13 (HT2B) - E12-11 (E03) L - W-B
E9-2 (OX1B) - E9-1 (EX1B) W - BR Heated oxygen sensor Maintain engine speed at 2500 rpm for 2 minutes after warming up sensor Pulse generation (see waveform 3  3)
E9-4 (OX2B) - E9-3 (EX2B) B - BR
E12-6 (#10) - E12-14 (E01) R-L - W-B Injector Ignition switch ON 11 to 14 V
E12-1 (#20) - E12-14 (E01) B - W-B
E12-7 (#30) - E12-14 (E01) R - W-B
E12-2 (#40) - E12-14 (E01) G - W-B
E12-8 (#50) - E12-14 (E01) Y - W-B
E12-3 (#60) - E12-14 (E01) L - W-B
E12-6 (#10) - E12-14 (E01) R-L - W-B Injector Idling Pulse generation (see waveform 4  4)
E12-1 (#20) - E12-14 (E01) B - W-B
E12-7 (#30) - E12-14 (E01) R - W-B
E12-2 (#40) - E12-14 (E01) G - W-B
E12-8 (#50) - E12-14 (E01) Y - W-B
E12-3 (#60) - E12-14 (E01) L - W-B
E10-11 (KNK1) - E10-12 (EKNK) B-W Knock sensor Maintain engine speed at 4000 rpm after warming up engine Pulse generation (see waveform 5  5)
E10-5 (KNK2) - E10-6 (EKN2) G-R Knock sensor Maintain engine speed at 4000 rpm after warming up engine Pulse generation (see waveform 5  5)
E9-9 (VV1+) - E9-10 (W1-) R - B-Y Variable valve timing (VVT) sensor Idling Pulse generation (see waveform 6  6)
E9-12 (VV2+) - E9-11 (VV2-) G-W - V Variable valve timing (VVT) sensor Idling Pulse generation (see waveform 6  6)
E9-6 (NE+) - E9-5 (NE-) B - W Crankshaft position sensor Idling Pulse generation (see waveform 6  6)
E11-24 (IGT1) - E11-12 (E1) B - BR Ignition coil with igniter (ignition signal) Idling Pulse generation (see waveform 7  7)
E11-25 (IGT2) - E11-12 (E1) P-L - BR
E11-26 (IGT3) - E11-12 (E1) LG - BR
E11-27 (IGT4) - E11-12 (E1) LG-B - BR
E11-28 (IGT5) - E11-12 (E1) R-Y - BR
E10-25 (IGT6) - E11-12 (E1) LG-B - BR
E11-6 (IGF1) - E11-12 (E1) W-R - BR Ignition coil with igniter (ignition confirmation signal) Ignition switch ON 4.5 to 5.0 V
E11-6 (IGF1) - E11-12 (E1) W-R - BR Ignition coil with igniter (ignition confirmation signal) Idling Pulse generation (see waveform 7  7)
E11-18 (PRG) - E11-12 (E1) Y - BR Purge VSV Ignition switch ON 11 to 14 V
E11-18 (PRG) - E11-12 (E1) Y - BR Purge VSV Idling Pulse generation (see waveform 8  8)
E13-18 (SPD) - E11-12 (E1) V-W - BR Speed signal from combination meter Driving at 12 mph (20 km/h) Pulse generation (see waveform 9  9)
E14-10 (STA) - E11-12 (E1) B-Y - BR Starter signal Cranking 11 to 14 V
E14-18 (STP) - E11-12 (E1) L - BR Stop light switch Brake pedal depressed 7.5 to 14 V
E14-18 (STP) - E11-12 (E1) L - BR Stop light switch Brake pedal released Below 1.5 V
E13-8 (ST1-) - E11-12 (E1) V-W - BR Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal depressed Below 1.5 V
E13-8 (ST1-) - E11-12 (E1) V-W - BR Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal released 7.5 to 14 V
E10-2 (NSW) - E11-12 (E1) V - BR Park/Neutral position switch Ignition switch ON, Shift lever position in P or N Below 3.0 V
E10-2 (NSW) - E11-12 (E1) V - BR Park/Neutral position switch Ignition switch ON, Shift lever position other than P and N 11 to 14 V
E12-20 (M+) - E12-10 (ME01) P - W-B Throttle motor Idling with warm engine Pulse generation (see waveform 10  10)
E11-29 (M-) - E12-10 (ME01) L - W-B Throttle motor Idling with warm engine Pulse generation (see waveform 11  11)
E13-3 (FC) - E11-12 (E1) L-B - BR Fuel pump control Ignition switch ON 11 to 14 V
E14-8 (FPR) - E11-12 (E1) Y-R - BR Fuel pump control Ignition switch ON 11 to 14 V
E13-13 (W) - E11-12 (E1) BR - BR MIL Ignition switch ON Below 3.0 V
E13-13 (W) - E11-12 (E1) BR - BR MIL Idling 11 to 14 V
E13-11 (ELS) - E11-12 (E1) B - BR Electric load Defogger switch OFF 0 to 1.5 V
E13-11 (ELS) - E11-12 (E1) B - BR Electric load Defogger switch ON 7.5 to 14 V
E13-10 (ELS2) - E11-12 (E1) B-W - BR Electric load Taillight switch OFF 0 to 1.5 V
E13-10 (ELS2) - E11-12 (E1) B-W - BR Electric load Taillight switch ON 7.5 to 14 V
E14-28 (TC) - E11-12 (E1) G - BR Terminal TC of DLC 3 Ignition switch ON 11 to 14 V
E14-29 (TACH) - E11-12 (E1) B-W - BR Engine speed Idling Pulse generation (see waveform 12  12)
E11-19 (ACIS) - E11-12 (E1) W-L - BR VSV for ACIS Ignition switch ON 11 to 14 V
E10-16 (PSW) - E11-12 (E1) G-W - BR P/S pressure switch Ignition switch ON 11 to 14 V
E14-19 (VPMP) - E11-12 (E1) V-W - BR Vent valve (built into canister pump module) Ignition switch ON 11 to 14 V
E14-7 (MPMP) - E11-12 (E1) G - BR Leak detection pump (built into canister pump module) Leak detection pump OFF 0 to 3 V
E14-7 (MPMP) - E11-12 (E1) G - BR Leak detection pump (built into canister pump module) Leak detection pump ON 11 to 14 V
E10-1 (PPMP) - E10-8 (ETHW) GR - BR Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
E13-17 (F/PS) - E11-12 (E1) BE - BR Airbag sensor assembly Idling with warm engine Pulse generation (see waveform 13  13)
E14-32 (CANH) - E11-12 (E1) B - BR CAN communication line Ignition switch ON Pulse generation (see waveform 14  14)
E14-31 (CANL) - E11-12 (E1) W - BR CAN communication line Ignition switch ON Pulse generation (see waveform 15  15)
(1) The ECM terminal voltage is constant regardless of the output voltage from the sensor.
  1. WAVEFORM 1 

    Camshaft Timing Oil Control Valve (OCV) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between OC1+ and OC1- or OC2+ and OC2-
    Tester Range 5 V/DIV, 1 msec./DIV
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 2: Waveform Graph - Camshaft Timing Oil Control Valve (OCV)
    G05197709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 

    Air Fuel Ratio Sensor Heater 

    WAVEFORM REFERENCE

    ECM Terminal Name CH1: Between HA1A and E04
    CH2: Between HA2A and E05
    Tester Range 5 V/DIV, 10 msec./DIV
    Condition Idling with warm engine

    HINT:

    The wavelength varies in accordance with the engine operating condition.

    Fig 3: Waveform Graph - Air Fuel Ratio Sensor Heater
    G05577190Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. WAVEFORM 3 

    Heated Oxygen Sensor 

    WAVEFORM REFERENCE

    ECM Terminal Name Between OX1B and EX1B or 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

    HINT:

    In the Data List, item O2S B1 S2 or O2S B2 S2 shows the ECM input values from the heated oxygen sensor.

    Fig 4: Waveform Graph - Heated Oxygen Sensor
    G05197710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. WAVEFORM 4 

    Fuel Injector 

    WAVEFORM REFERENCE

    ECM Terminal Name Between #10 (to 60) and E01
    Tester Range 30 V/DIV, 20 msec./DIV
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 5: Waveform Graph - Fuel Injector
    G05197711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. WAVEFORM 5 

    Knock Sensor 

    WAVEFORM REFERENCE

    ECM Terminal Name Between KNK1 and EKNK or KNK2 and EKN2
    Tester Range 0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
    Condition Engine speed maintained at 4000 rpm after warming up engine

    HINT:

    • The wavelength becomes shorter as the engine rpm increases.
    • The waveforms and amplitudes displayed on the tester differ slightly depending on the vehicle.
      Fig 6: Waveform Graph - Knock Sensor
      G05197712Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. WAVEFORM 6 
    1. VVT sensor
    2. Crankshaft position sensor
      WAVEFORM REFERENCE

      ECM Terminal Name
      1. Between NE+ and NE-
      2. Between VV1+ and VV1- or VV2+ and VV2-
      Tester Range 2 V/DIV, 20 msec./DIV
      Condition Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 7: Waveform Graph - Crankshaft Position Sensor
      G05197713Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. WAVEFORM 7 
    1. Igniter IGT signal (from ECM to igniter)
    2. Igniter IGF signal (from igniter to ECM)
      WAVEFORM REFERENCE

      ECM Terminal Name
      1. Between IGT (1 to 6) and E1
      2. Between IGF1 and E1
      Tester Ranges 2 2 V/DIV, 20 msec./DIV
      Condition Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 8: Waveform Graph - Igniter IGF Signal
      G05197714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. WAVEFORM 8 

    Purge VSV 

    WAVEFORM REFERENCE

    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV, 50 msec./DIV
    Condition Idling

    HINT:

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

    Fig 9: Waveform Graph - Purge VSV
    G05197715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. WAVEFORM 9 

    Vehicle Speed Signal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between SPD and E1
    Tester Range 2 V/DIV, 20 msec./DIV
    Condition Driving at 12 mph (20 km/h)

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

    Fig 10: Waveform Graph - Vehicle Speed Signal
    G05197716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. WAVEFORM 10 

    Throttle Actuator Positive Terminal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between M+ and ME01
    Tester Range 5 V/DIV, 1 msec./DIV
    Condition Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Waveform Graph - Throttle Actuator Positive Terminal
    G05197717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. WAVEFORM 11 

    Throttle Actuator Negative Terminal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between M- and ME01
    Tester Range 5 V/DIV, 1 msec./DIV
    Condition Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 12: Waveform Graph - Throttle Actuator Negative Terminal
    G05197718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. WAVEFORM 12 

    Engine Speed Signal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between TACH and E1
    Tester Range 5 V/DIV, 10 msec./DIV
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 13: Waveform Graph - Engine Speed Signal
    G05197719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 

    Airbag Sensor Assembly 

    WAVEFORM REFERENCE

    ECM Terminal Name Between F/PS and E1
    Tester Range 5 V/DIV, 500 msec./DIV
    Condition Idling with warm engine
    Fig 14: Waveform Graph - Airbag Sensor Assembly
    G05197720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. WAVEFORM 14 

    CAN Communication Signal (Reference) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between CANH and E1
    Tester Range 1 V/DIV, 10 μsec./DIV
    Condition Stop engine and ignition switch to ON

    HINT:

    The wavelength varies depending on the CAN communication signal.

    Fig 15: Waveform Graph - CAN Communication Signal
    G04828030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. WAVEFORM 15 

    CAN Communication Signal (Reference) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between CANL and E1
    Tester Range 1 V/DIV, 10 μsec./DIV
    Condition Stop engine and ignition switch to ON

    HINT:

    The wavelength varies depending on the CAN communication signal.

    Fig 16: Waveform Graph - CAN Communication Signal
    G05197722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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