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Terminals Of ECM

Fig 1: Identifying Terminals Of ECM
G04220982Courtesy 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 Specified Condition column.

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

ECM TERMINALS REFERENCE CHART

Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
BATT (E4-3) - E1 (E6-1) V - L Battery (for measuring battery voltage and for ECM memory) Always 9 to 14 V
+BM (E5-6) - E1 (E6-1) BR - L Power source of throttle motor Always 9 to 14 V
IGSW (E4-9) - E1 (E6-1) G - L Ignition switch Ignition switch ON 9 to 14 V
+B (E4-1) - E1 (E6-1) B - L Power source of ECM Ignition switch ON 9 to 14 V
MREL (E4-8) - E1 (E6-1) O - L EFI relay Ignition switch ON 9 to 14 V
VC (E8-18) - E2 (E8-28) V - R Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
VTA1 (E8-21) - E2 (E8-28) LG - R Throttle position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released 0.4 to 1.0 V
VTA1 (E8-21) - E2 (E8-28) LG - R Throttle position sensor (for engine control) Ignition switch ON, Accelerator pedal fully depressed 3.2 to 4.8 V
VTA2 (E8-31) - E2 (E8-28) BR - R Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released 2.1 to 3.1 V
VTA2 (E8-31) - E2 (E8-28) BR - R Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully depressed 4.5 to 5.5 V
VPA (E4-22) - EPA (E4-28) W - BR Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released 0.5 to 1.1 V
VPA (E4-22) - EPA (E4-28) W - BR Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully depressed 2.5 to 4.6 V
VPA2 (E4-23) - EPA2 (E4-29) V - R Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released 1.5 to 2.9 V
VPA2 (E4-23) - EPA2 (E4-29) V - R Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully depressed 3.5 to 5.5 V
VCPA (E4-26) - EPA (E4-28) L - BR Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
VCP2 (E4-27) - EPA2 (E4-29) P - R Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
VG (E8-30) - EVG (E8-29) R - W Mass air flow meter Idling, Shift position P or N, A/C switch OFF 0.5 to 3.0 V
THA (E8-20) - E2 (E8-28) L - R Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
THW (E8-19) - E2 (E8-28) G - R Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
#1 (E8-1) - E01 (E8-7) L - B Injector Ignition switch ON 9 to 14 V
#2 (E8-2) - E01 (E8-7) R - B
#3 (E8-3) - E01 (E8-7) Y - B
#4 (E8-4) - E01 (E8-7) W - B
#1 (E8-1) - E01 (E8-7) L - B Injector Idling Pulse generation (see waveform 1)
#2 (E8-2) - E01 (E8-7) R - B
#3 (E8-3) - E01 (E8-7) Y - B
#4 (E8-4) - E01 (E8-7) W - B
IGT1 (E8-8) - E1 (E6-1) G - L Ignition coil with igniter (ignition signal) Idling Pulse generation (see waveform 2)
IGT2 (E8-9) - E1 (E6-1) P - L
IGT3 (E8-10) - E1 (E6-1) B - L
IGT4 (E8-11) - E1 (E6-1) LG - L
IGF1 (E8-24) - E1 (E6-1) V - L Ignition coil with igniter (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
IGF1 (E8-24) - E1 (E6-1) V - L Ignition coil with igniter (ignition confirmation signal) Idling Pulse generation (see waveform 2)
G2+ (E6-27) - NE- (E6-24) P - G Camshaft position sensor Idling Pulse generation (see waveform 3)
NE+ (E6-25) - NE- (E6-24) R - G Crankshaft position sensor Idling Pulse generation (see waveform 3)
FC (E4-10) - E1 (E6-1) L - L Fuel pump control Ignition switch ON 9 to 14 V
M+ (E6-3) - E01 (E8-7) B - B Throttle actuator Idling Pulse generation (see waveform 4)
M- (E6-2) - E01 (E8-7) W - B Throttle actuator Idling Pulse generation (see waveform 5)
A1A+ (E7-23) - E1 (E6-1) O - L A/F sensor Always (Ignition switch ON) 3.3 V fixed(1)
A1A- (E7-31) - E1 (E6-1) W - L A/F sensor Always (Ignition switch ON) 3.0 V fixed(1)
OX1B (E7-29) - O1B- (E7-2) B - W Heated oxygen sensor Maintain engine speed at 2,500 rpm for 2 minutes after warming up sensor Pulse generation (see waveform 6)
HA1A (E7-5) - E04 (E7-7) G - W-B A/F sensor heater Idling Below 3.0 V
HA1A (E7-5) - E04 (E7-7) G - W-B A/F sensor heater Ignition switch ON 9 to 14 V
HT1B (E7-21) - E03 (E6-7) L - BR Heated oxygen sensor heater Idling Below 3.0 V
HT1B (E7-21) - E03 (E6-7) L - BR Heated oxygen sensor heater Ignition switch ON 9 to 14 V
KNK1 (E7-1) - EKNK (E7-28) R - G Knock sensor Maintain engine speed at 4,000 rpm after warming up engine Pulse generation (see waveform 7)
OC1+ (E6-16) - OC1- (E6-15) Y - W Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see waveform 8)
PRG (E8-34) - E01 (E8-7) R - B EVAP VSV Ignition switch ON 9 to 14 V
PRG (E8-34) - E01 (E8-7) R - B EVAP VSV Idling Pulse generation (see waveform 9)
VPMP (E8-27) - E1 (E6-1) LG - L Vent valve (built into pump module) Ignition switch ON 9 to 14 V
MPMP (E4-4) - E1 (E6-1) L - L Vacuum pump (built into pump module)
  • Vacuum pump OFF
  • Vacuum pump ON
 0 to 3 V
9 to 14 V
PPMP (E4-21) - E1 (E6-1) LG - L Pressure sensor (built into pump module) Ignition switch ON 3 to 3.6 V
STA (E8-17) - E1 (E6-1) B - L Starter signal Shift position N, Ignition switch START 6.0 V or more
STP (E5-19) - E1 (E6-1) L - L Stop light switch Brake pedal depressed 9 to 14 V
STP (E5-19) - E1 (E6-1) L - L Stop light switch Brake pedal released Below 1.5 V
ST1- (E5-12) - E1 (E6-1) L - L Stop light switch Ignition switch ON, Brake pedal depressed Below 1.5 V
ST1- (E5-12) - E1 (E6-1) L - L Stop light switch Ignition switch ON, Brake pedal released 7.5 to 14 V
W (E4-11) - E01 (E8-7) G - B MIL Idling 9 to 14 V
W (E4-11) - E01 (E8-7) G - B MIL Ignition switch ON Below 3.0 V
ELS (E4-12) - E1 (E6-1) P - L Electric load Taillight switch ON, Defogger switch ON 7.5 to 14 V
ELS (E4-12) - E1 (E6-1) P - L Electric load Taillight switch OFF, Defogger switch OFF 0 to 1.5 V
TACH (E4-5) - E1 (E6-1) B - L Engine speed Idling Pulse generation (see waveform 10)
SPD (E5-17) - E01 (E8-7) V - B Speed signal from combination meter Ignition switch ON, Rotate driving wheel slowly Pulse generation (see waveform 11)
TC (E4-20) - E1 (E6-1) R - L Terminal TC of DLC3 Ignition switch ON 9 to 14 V
SIL (E4-18) - E1 (E6-1) W - L Terminal SIL of DLC3 Connect intelligent tester to DLC3 Pulse generation (see waveform 12)
PSW (E6-10) - E1 (E6-1) R - L Power steering oil pressure switch While turning steering wheel Below 1.5 V
F/PS (E4-14) - E1 (E6-1) Y - L Airbag sensor assembly Ignition switch ON Pulse generation (see waveform 13)
(1) The ECM terminal voltage is constant regardless of the output voltage from the sensor.
  1. WAVEFORM 1 

    Fuel injector 

    WAVEFORM REFERENCE CHART

    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: Waveform 1 Graph
    G04220983Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 
    1. Igniter IGT signal (from ECM to igniter) 
      WAVEFORM REFERENCE CHART

      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 CHART

    Item Content
    ECM Terminal Names Between IGF1 and E1
    Tester Ranges 2 V/DIV., 20 msec./DIV.
    Conditions Idling
    Fig 3: Waveform 2 Graph
    G04220984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  3. WAVEFORM 3 
    1. Camshaft position sensor 
      WAVEFORM REFERENCE CHART

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

      Item Content
      ECM Terminal Names Between NE+ and NETester
      Ranges 5 V/DIV., 20 msec./DIV.
      Conditions Idling
      Fig 4: Waveform 3 Graph
      G04220985Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

  4. WAVEFORM 4 

    Throttle actuator positive terminal 

    WAVEFORM REFERENCE CHART

    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: Waveform 4 Graph
    G04220986Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. WAVEFORM 5 

    Throttle actuator negative terminal 

    WAVEFORM REFERENCE CHART

    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: Waveform 5 Graph
    G04220987Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. WAVEFORM 6 

    Heated oxygen sensor 

    WAVEFORM REFERENCE CHART

    Item Content
    ECM Terminal Names Between OX1B and E2
    Tester Ranges 0.2 V/DIV., 200 msec./DIV.
    Conditions Engine speed maintained 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: Waveform 6 Graph
    G04220988Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. WAVEFORM 7 

    Knock sensor 

    WAVEFORM REFERENCE CHART

    Item Content
    ECM Terminal Names Between KNK1 and EKNK
    Tester Ranges 0.01 to 10 V/DIV., 0.01 to 10 msec./DIV.
    Conditions Maintain engine speed 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: Waveform 7 Graph
    G04220989Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. WAVEFORM 8 

    Camshaft timing oil control valve (OCV) 

    WAVEFORM REFERENCE CHART

    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: Waveform 8 Graph
    G04220990Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. WAVEFORM 9 

    Purge VSV 

    WAVEFORM REFERENCE CHART

    Item Content
    ECM Terminal Names Between PRG and E01
    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: Waveform 9 Graph
    G04220991Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. WAVEFORM 10 

    Engine speed signal 

    WAVEFORM REFERENCE CHART

    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: Waveform 10 Graph
    G04220992Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. WAVEFORM 11 

    Vehicle speed signal 

    WAVEFORM REFERENCE CHART

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

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

    Fig 12: Waveform 11 Graph
    G04220993Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. WAVEFORM 12 

    Terminal SIL of DLC3 

    WAVEFORM REFERENCE CHART

    Item Content
    ECM Terminal Names Between SIL and E1
    Tester Ranges 5 V/DIV., 1 msec./DIV.
    Conditions Connect intelligent tester to DLC3
    Fig 13: Waveform 12 Graph
    G04220994Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 

    Airbag sensor assembly 

    WAVEFORM REFERENCE CHART

    Item Content
    ECM Terminal Names Between F/PS and E1
    Tester Ranges 5 V/DIV., 500 msec./DIV.
    Conditions Idling with warm engine
    Fig 14: Waveform 13 Graph
    G04220995Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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