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Terminals Of ECM

Fig 1: Identifying ECM Connectors Terminals
G05192316Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

The standard voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals is also indicated.

The result of checks should be compared with the standard voltage for that pair of terminals, displayed in the STD Voltage column.

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

TERMINALS REFERENCE

Symbols (Terminals No.) Wiring Color Terminal Description Conditions STD Voltages
BATT (E6-3) - E1 (E3-5) R-W - BR Battery (for measuring battery voltage and for ECM memory) Always Between 9 V and 14 V
+BM (E5-6) - E1 (E3-5) B-R - BR Power source of throttle motor Always Between 9 V and 14 V
IGSW (E6-9) - E1 (E3-5) B-O - BR Ignition switch Ignition switch ON Between 9 V and 14 V
+B(E6-1) - E1 (E3-5) B - BR Power source of ECM Ignition switch ON Between 9V and 14 V
MREL (E6-8) - E1 (E3-5) B-W - BR EFI relay Ignition switch ON Between 9 V and 14 V
VC(E3-18) - E2 (E3-28) Y - BR Power source of sensor (specific voltage) Ignition switch ON Between 4.5 V and 5.5 V
VTA1 (E3-21) - E2 (E3-28) LG - BR Throttle position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released Between 0.5 V and 1.1 V
VTA1 (E3-21) - E2 (E3-28) LG - BR Throttle position sensor (for engine control) Ignition switch ON, Accelerator pedal fully depressed Between 3.3 V and 4.9 V
VTA2 (E3-31) - E2 (E3-28) LG - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released Between 2.1 V and 3.1 V
VTA2 (E3-31) - E2 (E3-28) LG - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully depressed Between 4.5 V and 5.5 V
VPA (E6-22) - EPA (E6-28) G - Y Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released Between 0.5 V and 1.1 V
VPA (E6-22) - EPA (E6-28) G - Y Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully depressed Between 2.6 V and 4.5 V
VPA2 (E6-23) - EPA2 (E6-29) W - Y Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released Between 1.2 V and 2.0 V
VPA2 (E6-23) - EPA2 (E6-29) W - Y Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully depressed Between 3.4 V and 5.3 V
VCPA (E6-26) - EPA (E6-28) B - Y Power source of accelerator pedal position sensor (for VPA) Ignition switch ON Between 4.5 V and 5.5 V
VCP2 (E6-27) - EPA2 (E6-29) B - Y Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON Between 4.5 V and 5.5 V
VG (E3-30) - EVG (E3-29) G - L-W Mass air flow meter Idling, Shift position P or N, A/C switch OFF Between 0.5 V and 3.0 V
THA (E3-20) - E2 (E3-28) Y-B - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) Between 0.5 V and 3.4 V
THW(E3-19) - E2 (E3-28) W - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) Between 0.2 V and 1.0 V
#10 (E3-1) - E01 (E3-7)
#20 (E3-2) - E01 (E3-7)
#30 (E3-3) - E01 (E3-7)
#40 (E3-4) - E01 (E3-7)		 Y - W-B
B - W-B
W - W-B
L - W-B		 Injector Ignition switch ON Between 9 V and 14 V
#10 (E3-1) - E01 (E3-7)
#20 (E3-2) - E01 (E3-7)
#30 (E3-3) - E01 (E3-7)
#40 (E3-4) - E01 (E3-7)		 Y - W-B
B - W-B
W - W-B
L - W-B		 Injector Idling Pulse generation (see WAVEFORM 1 )
IGT1 (E3-8) - E1 (E3-5)
IGT2 (E3-9) - E1 (E3-5)
IGT3 (E3-10) - E1 (E3-5)
IGT4 (E3-11) - E1 (E3-5)		 R-L - BR
Y-G - BR
GR - BR
W - BR		 Ignition coil with igniter (ignition signal) Idling Pulse generation (see WAVEFORM 2 )
IGF1 (E3-24) - E1 (E3-5) L-Y - BR Ignition coil with igniter (ignition confirmation signal) Ignition switch ON Between 4.5 V and 5.5 V
IGF1 (E3-24) - E1 (E3-5) L-Y - BR Ignition coil with igniter (ignition confirmation signal) Idling Pulse generation (see WAVEFORM 2 )
G2+ (E4-24) - NE- (E4-33) B - W Camshaft position sensor Idling Pulse generation (see WAVEFORM 3 )
NE+ (E4-25) - NE- (E4-33) B - W Crankshaft position sensor Idling Pulse generation (see WAVEFORM 3 )
FC (E6-10) - E1 (E3-5) G-R - BR Fuel pump control Ignition switch ON Between 9 V and 14 V
FC (E6-10) - E1 (E3-5) G-R - BR Fuel pump control Idling Below 1.5 V
M+ (E4-4) - ME01 (E4-2) B - W-B Throttle actuator Ignition with warm engine Pulse generation (see WAVEFORM 4 )
M- (E4-3) - ME01 (E4-2) W - W-B Throttle actuator Ignition with warm engine Pulse generation (see WAVEFORM 5 )
A1A+ (E4-23) - E1 (E3-5) B - BR A/F sensor Always (Ignition switch ON) 3.3 V(1)
A1A- (E4-31) - E1 (E3-5) W - BR A/F sensor Always (Ignition switch ON) 3.0 V(1)
OX1B (E4-29) - E2 (E3-28) W - BR Heated oxygen sensor Engine speed maintained 2,500 rpm for 2 minutes after warming up sensor Pulse generation (see WAVEFORM 6 )
HA1A (E4-5) - E04 (E4-7) P - W-B A/F sensor heater Idling Below 3.0 V
HA1A (E4-5) - E04 (E4-7) P - W-B A/F sensor heater Ignition switch ON Between 9 V and 14 V
HT1B (E4-21) - E03 (E4-6) P-B - W-B Heated oxygen sensor heater Idling Below 3.0 V
HT1B (E4-21) - E03 (E4-6) P-B - W-B Heated oxygen sensor heater Ignition switch ON Between 9 V and 14 V
KNK1 (E4-1) - EKNK (E4-28) B - W Knock sensor Maintain engine speed 4,000 rpm after warming up engine Pulse generation (see WAVEFORM 7 )
OC1+ (E3-13) - OC1- (E3-12) Y - B-Y Camshaft timing oil control valve (OCV) Idling Pulse generation (see WAVEFORM 8 )
PRG (E3-34) - E01 (E3-7) L-B - W-B EVAP VSV Ignition switch ON Between 9 V and 14 V
PRG (E3-34) - E01 (E3-7) L-B - W-B EVAP VSV Idling Pulse generation (see WAVEFORM 9 )
VPMP (E3-27) - E1 (E3-5) R - BR Vent valve (built into pump module) Ignition switch ON Between 9 V and 14 V
MPMP (E6-4) - E1 (E3-5) GR - BR Vacuum pump (built into pump module)
  • Vacuum pump OFF
  • Vacuum pump ON
 Between 0 V and 3 V Between 9 V and 14 V
PPMP (E6-21) - E2 (E3-28) L - BR Pressure sensor (built into pump module) Ignition switch ON Between 3 V and 3.6 V
STA (E3-17) - E1 (E3-5) B - BR Starter signal Shift position N, Ignition switch START 5.5 V or more
STP (E5-19) - E1 (E3-5) G-W - BR Stop light switch Brake pedal depressed Between 7.5 V and 14 V
STP (E5-19) - E1 (E3-5) G-W - BR Stop light switch Brake pedal released Below 1.5 V
ST1- (E5-12) - E1 (E3-5) G-0 - BR Stop light switch Ignition switch ON, Brake pedal depressed Below 1.5 V
ST1- (E5-12) - E1 (E3-5) G-O - BR Stop light switch Ignition switch ON, Brake pedal released Between 7.5 V and 14 V
W (E6-11) - E01 (E3-7) R-Y - W-B MIL Idling Between 9 V and 14 V
W (E6-11) - E01 (E3-7) R-Y - W-B MIL Ignition switch ON Below 3.5 V
ELS1 (E6-12) - E1 (E3-5) G - BR Electric load Taillight switch ON Between 7.5 V and 14 V
ELS1 (E6-12) - E1 (E3-5) G - BR Electric load Taillight switch ON Between 0 V and 1.5 V
ELS2 (E6-13) - E1 (E3-5) W - BR Electric load Defogger switch ON Between 7.5 V and 14 V
ELS2 (E6-13) - E1 (E3-5) W - BR Electric load Defogger switch OFF Between 0 V and 1.5 V
TACH (E6-5) - E1 (E3-5) B - BR Engine speed Idling Pulse generation (see WAVEFORM 10 )
SPD (E5-17) - E1 (E3-5) V-W - BR Speed signal from combination meter Driving at 12 mph (20 km/h) Pulse generation (see WAVEFORM 11 )
TC (E6-20) - E1 (E3-5) P-B - BR Terminal TC of DLC3 Ignition switch ON Between 9 V and 14 V
SIL (E6-18) - E1 (E3-5) L-R - BR Terminal SIL of DLC3 Connect intelligent tester or OBD II scan tool to DLC3 Pulse generation (see WAVEFORM 12 )
PSW (E4-8) - E1 (E3-5) L-R - BR Power steering oil pressure switch While turning steering wheel Between 1.5 V
F/PS (E6-14) - E1 (E3-5) Y - BR Airbag sensor assembly Idling with warm engine Pulse generation (see WAVEFORM 13 )
(1) The ECM terminal voltage is constant regardless of the output voltage from the sensor.
  1. WAVEFORM 1 
    1. Fuel injector
    WAVEFORM REFERENCE

    ECM Terminal Names Between #10 (to 40) 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
    G05192317Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  2. WAVEFORM 2 
    1. Igniter IGT signal (from ECM to igniter)
    2. Igniter IGF signal (from igniter to ECM)
    WAVEFORM REFERENCE

    ECM Terminal Names
    1. Between IGT (1 to 4) and E1
    2. Between IGF1 and E1
    Tester Ranges 2 V/DIV, 20 msec./DIV
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 3: Identifying Waveform 2
    G05192318Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  3. WAVEFORM 3 
    1. Camshaft position sensor
    2. Crankshaft position sensor
    WAVEFORM REFERENCE

    ECM Terminal Names
    1. Between G2+ and NE-
    2. Between NE+ and NE-
    Tester Ranges 5 V/DIV, 20 msec./DIV
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 4: Identifying Waveform 3
    G05192319Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  4. WAVEFORM 4 
    1. Throttle actuator positive terminal
    WAVEFORM REFERENCE

    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
    G05192320Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  5. WAVEFORM 5 
    1. Throttle actuator negative terminal
    WAVEFORM REFERENCE

    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
    G05192321Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  6. WAVEFORM 6 
    1. Heated oxygen sensor
    WAVEFORM REFERENCE

    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: Identifying Waveform 6
    G05192322Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  7. WAVEFORM 7 
    1. Knock sensor
    WAVEFORM REFERENCE

    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: Identifying Waveform 7
    G05192323Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  8. WAVEFORM 8 
    1. Camshaft timing oil control valve (OCV)
    WAVEFORM REFERENCE

    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
    G05192324Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  9. WAVEFORM 9 
    1. EVAP VSV
    WAVEFORM REFERENCE

    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: Identifying Waveform 9
    G05192325Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  10. WAVEFORM 10 
    1. Engine speed signal
    WAVEFORM REFERENCE

    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
    G05192326Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  11. WAVEFORM 11 
    1. Vehicle speed signal
    WAVEFORM REFERENCE

    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
    G05192327Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  12. WAVEFORM 12 
    1. Terminal SIL of DLC3
    WAVEFORM REFERENCE

    ECM Terminal Names Between SIL and E1
    Tester Ranges 5 V/DIV, 1 msec./DIV
    Conditions Connect intelligent tester or OBD II scan tool to DLC3
    Fig 13: Identifying Waveform 12
    G05192328Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  13. WAVEFORM 13 
    1. Airbag sensor assembly
    WAVEFORM REFERENCE

    ECM Terminal Names Between F/PS and E1
    Tester Ranges 5 V/DIV, 500 msec./DIV
    Conditions Idling with warm engine
    Fig 14: Identifying Waveform 13
    G05192329Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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