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Terminals Of ECM

Fig 1: Identifying ECM Connector Terminals
G05127982Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The standard normal voltage between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of the terminals, and displayed in the "Specified Conditions" column. The illustration above can be used as a reference to identify the ECM terminal locations.

TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
E4-3 (BATT) - E8-3 (E1) V - L Battery (for measuring battery voltage and for ECM memory) Always 9 to 14 V
E4-7 (+BM) - E8-3 (E1) BR - L Power source of throttle motor Always 9 to 14 V
E4-9 (IGSW) - E8-3 (E1) G - L Ignition switch Ignition switch ON 9 to 14 V
E4-1 (+B) - E8-3 (E1) GR - L Power source of ECM Ignition switch ON 9 to 14 V
E4-2 (+B2) - E8-3 (E1) O - L Power source of ECM Ignition switch ON 9 to 14 V
E8-13 (OC1+) - E8-12 (OC1-) Y - W Camshaft timing oil control valve (OCV) Idling Pulse generation (See  8 waveform 8)
E4-8 (MREL) - E8-7 (E01) O - B EFI relay Ignition switch ON 9 to 14 V
E8-18 (VC) - E8-28 (E2) V - R Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
E7-28 (VG) - E7-30 (E2G) R - W Mass air flow meter Idling, shift lever position P or N position, A/C switch OFF 0.5 to 3.0 V
E7-29 (THA) - E8-28 (E2) L - R Intake air temperature sensor Idling, intake air temp 20°C (68°F) 0.5 to 3.4 V
E8-32 (THW) - E8-28 (E2) G - R Engine coolant temperature sensor Idling, engine coolant temp. 80°C (176°F) 0.2 to 1.0 V
E8-20 (VTA1) - E8-28 (E2) LG - R Throttle position sensor (for engine control) Ignition switch ON, accelerator pedal released 0.3 to 1.0 V
Ignition switch ON, accelerator pedal depressed 3.2 to 4.9 V
E8-19 (VTA2) - E8-28 (E2) BR - R Throttle position sensor (for sensor malfunction detection) Ignition switch ON, accelerator pedal released 2.1 to 3.1 V
Ignition switch ON, accelerator pedal depressed 4.5 to 5.5 V
E4-18 (VPA) - E4-20 (EPA) W - BR Accelerator pedal position sensor (for engine control) Ignition switch ON, accelerator pedal released 0.5 to 1.1 V
Ignition switch ON, accelerator pedal depressed 2.6 to 4.5 V
E4-19 (VPA2) - E4-21 (EPA2) V - R 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 depressed 3 4 to 5.3 V
E4-26 (VCPA) - E4-20 (EPA) L - BR Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
E4-27 (VCP2) - E4-21 (EPA2) P - R Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5 5 V
E8-1 (HA1A) - E7-7 (E04) G - W-B A/F sensor heater Idling Below 3.0 V
Ignition switch ON 9 to 14 V
E8-21 (A1A+) - E8-3 (E1) O - L A/F sensor Ignition switch ON 3.0 to 3.6 V
E8-31 (A1A-) - E8-3 (E1) W - L A/F sensor Ignition switch ON 2.7 to 3.3 V
E8-2 (HT1B) - E7-4 (E03) L - BR Heated oxygen sensor heater Idling Below 3.0 V
Ignition switch ON 9 to 14 V
E8-25 (OX1B) - E8-28 (E2) B - R Heated oxygen sensor Maintain engine speed at 2500 rpm for 2 minutes after warming up Pulse generation (See  6 waveform 6)
E7-6 (#1) - E8-7 (E01)
E7-5 (#2) - E8-7 (E01)
E7-2 (#3) - E8-7 (E01)
E7-1 (#4) - E8-7 (E01)		 L - B
R - B
Y - B
W - B		 Injector Ignition switch ON 9 to 14 V
Idling Pulse generation (See  1 waveform 1)
E8-29 (KNK1) - E8-30 (EKNK) R - G Knock sensor Maintain engine speed at 4000 rpm after warming up engine Pulse generation (See  7 waveform 7)
E8-26 (G2+) - E8-34 (NE-) P - G Camshaft position sensor Idling Pulse generation (See  3 waveform 3)
E8-27 (NE+) - E8-34 (NE-) R - G Crankshaft position sensor Idling Pulse generation (See  3 waveform 3)
E8-17 (IGT1) - E8-3 (E1)
E8-16 (IGT2) - E8-3 (E1)
E8-15 (IGT3) - E8-3 (E1)
E8-14 (IGT4) - E8-3 (E1)		 G - L
P - L
B - L
LG - L		 Ignition coil with igniter (ignition signal) Idling Pulse generation (See  2 waveform 2)
E8-23 (IGF1) - E8-3 (E1) V - L Ignition coil with igniter (ignition confirmation signal) Ignition switch ON 4.5 to 5 5 V
Idling Pulse generation (See  2 waveform 2)
E7-23 (PRG) - E8-3 (E1) R - L Purge VSV Ignition switch ON 9 to 14 V
Idling Pulse generation (See  9 waveform 9)
E5-8 (SPD) - E8-3 (E1) V - L Speed signal from combination meter Ignition switch ON, rotate driving wheel slowly Pulse generation (See  11 waveform 11)
E4-12 (STA) - E8-3 (E1) B - L Starter signal Shift lever position P or N, ignition switch START 9 to 14 V
E5-4 (STP) - E8-3 (E1) L - L Stop light switch Brake pedal is depressed 7.5 to 14 V
Brake pedal is released Below 1.5 V
E4-16 (ST1-) - E8-3 (E1) L - L Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal is depressed Below 1.5 V
Ignition switch ON, Brake pedal is released 7.5 to 14 V
E4-30 (NSW) - E8-3 (E1) Y - L Park/neutral position switch Ignition switch ON, shift position at P or N 0 to 3.0 V
Ignition switch ON, shift position is not P or N 9 to 14 V
E8-5 (M+) - E7-3 (ME01) B - W-B Throttle actuator Idling with warm engine Pulse generation (See  4 waveform 4)
E8-4 (M-) - E7-3 (ME01) W - W-B Throttle actuator Idling with warm engine Pulse generation (See  5 waveform 5)
E4-25 (FC) - E8-7 (E01) L - B Fuel pump control Ignition switch ON 9 to 14 V
E5-30 (W) - E8-3 (E1) G - L MIL Ignition switch ON Below 3.0 V
Idling 9 to 14 V
E4-15 (ELS1) - E8-3 (E1) B - L Electric load Light control switch OFF 0 to 1.5 V
Light control switch is in TAIL position 9 to 14 V
E5-3 (ELS3) - E8-3 (E1) O - L Electric load Rear defogger switch OFF (Rear defogger system is not operating) 0 to 1.5 V
Rear defogger switch ON (Rear defogger system is operating) 9 to 14 V
E5-17 (TC) - E8-3 (E1) R - L Terminal TC of DLC 3 Ignition switch ON 9 to 14 V
E5-1 (TACH) - E8-3 (E1) B - L Engine speed Idling Pulse generation (See  10 waveform 10)
E7-32 (PSW) - E8-3 (E1) R - L P/S pressure switch Ignition switch ON 9 to 14 V
E4-5 (VPMP) - E8-7 (E01) G - B Vent valve (built into canister pump module) Ignition switch ON 9 to 14 V
E4-6 (MPMP) - E8-7 (E01) L - B Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3 V
Leak detection pump ON 9 to 14 V
E4-31 (PPMP) - E8-28 (E2) LG - R Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
E4-14 (FANH) - E8-7 (E01) GR - B Fan No. 2, 3 relay Idling with high engine coolant temperature Below 1.5 V
E8-10 (ALT) - E8-3 (E1) Y - L Generator Ignition switch ON 9 to 14 V
E5-33 (CANH) - E8-3 (E1) B - L CAN communication line Ignition switch ON Pulse generation (See  12 waveform 12)
E5-34 (CANL) - E8-3 (E1) W - L CAN communication line Ignition switch ON Pulse generation (See  13 waveform 13)
  1. WAVEFORM 1 

    Fuel injector 

    WAVEFORM REFERENCE

    Item Content
    ECM Terminal Names Between #1 (to 4) and E01
    Tester Ranges 20 V/DIV., 20 msec./DIV.
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 2: Identifying Waveform 1
    G05285433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 
    1. Igniter IGT signal (from ECM to igniter) 
      WAVEFORM REFERENCE

      Item Content
      ECM Terminal Names Between IGT (1 to 4) and E1
      Tester Ranges 2 V/DIV., 20 msec./DIV
      Conditions Idling
    2. Igniter IGF signal (from igniter to ECM) 
      WAVEFORM REFERENCE

      Item Content
      ECM Terminal Names Between IGF1 and E1
      Tester Ranges 2 V/DIV., 20 msec./DIV.
      Conditions Idling
      Fig 3: Identifying Waveform 2
      G05291267Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

  3. WAVEFORM 3 
    1. Camshaft position sensor 
      WAVEFORM REFERENCE

      Item Content
      ECM Terminal Names Between G2+ and NE-
      Tester Ranges 5 V/DIV., 20 msec./DIV.
      Conditions Idling
    2. Crankshaft position sensor 
      WAVEFORM REFERENCE

      Item Content
      ECM Terminal Names Between NE+ and NE-
      Tester Ranges 5 V/DIV., 20 msec./DIV.
      Conditions Idling
      Fig 4: Identifying Waveform 3
      G05538916Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

  4. WAVEFORM 4 

    Throttle actuator positive terminal 

    WAVEFORM REFERENCE

    Item Content
    ECM Terminal Names Between M+ and ME01
    Tester Ranges 5 V/DIV., 1 msec./DIV.
    Conditions Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 5: Identifying Waveform 4
    G05197717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. WAVEFORM 5 

    Throttle actuator negative terminal 

    WAVEFORM REFERENCE

    Item Content
    ECM Terminal Names Between M- and ME01
    Tester Ranges 5 V/DIV., 1 msec./DIV.
    Conditions Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 6: Identifying Waveform 5
    G05197718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. WAVEFORM 6 

    Heated oxygen sensor 

    WAVEFORM REFERENCE

    Item Content
    ECM Terminal Names Between OX1B and E2
    Tester Ranges 0.2 V/DIV., 200 msec./DIV.
    Conditions Engine speed maintained at 2, 500 rpm for 2 minutes after warming up sensor

    HINT:

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

    Fig 7: Identifying Waveform 6
    G05197710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. WAVEFORM 7 

    Knock sensor 

    WAVEFORM REFERENCE

    Item Content
    ECM Terminal Names Between KNK1 and EKNK
    Tester Ranges 0.01 to 10 V/DIV., 0.01 to 10 msec./DIV.
    Conditions Engine speed at 4, 000 rpm after warming up engine

    HINT:

    • The wavelength becomes shorter as the engine rpm increases.
    • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
    Fig 8: Identifying Waveform 7
    G05538920Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. WAVEFORM 8 

    Camshaft timing oil control valve (OCV) 

    WAVEFORM REFERENCE

    Item Content
    ECM Terminal Names Between OC1+ and OC1-
    Tester Ranges 5 V/DIV., 1 msec/DIV.
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 9: Identifying Waveform 8
    G05197709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. WAVEFORM 9 

    Purge VSV 

    WAVEFORM REFERENCE

    Item Content
    ECM Terminal Names Between PRG and E1
    Tester Ranges 5 V/DIV., 50 msec./DIV
    Conditions Idling

    HINT:

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

    Fig 10: Identifying Waveform 9
    G05538922Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. WAVEFORM 10 

    Engine speed signal 

    WAVEFORM REFERENCE

    Item Content
    ECM Terminal Names Between TACH and E1
    Tester Ranges 5 V/DIV., 10 msec./DIV
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 11: Identifying Waveform 10
    G05197719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. WAVEFORM 11 

    Vehicle speed signal 

    WAVEFORM REFERENCE

    Item Content
    ECM Terminal Names Between SPD and E1
    Tester Ranges 5 V/DIV., 20 msec./DIV.
    Conditions Driving at 12 mph (20 km/h)

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

    Fig 12: Identifying Waveform 11
    G05538924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. WAVEFORM 12 

    CAN communication signal: 

    WAVEFORM REFERENCE

    ECM Terminal Names Between CANH and E1
    Tester Ranges 1 V/DIV., 10 μsec./DIV.
    Conditions Engine stops and ignition switch to the ON position

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 13: Identifying Waveform 12
    G04828030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 

    CAN communication signal: 

    WAVEFORM REFERENCE

    ECM Terminal Names Between CANL and E1
    Tester Ranges 1 V/DIV., 10 μsec./DIV.
    Conditions Engine stops and ignition switch to the ON position

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 14: Identifying Waveform 13
    G04828031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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