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Terminals Of ECM

Fig 1: Identifying Connector Terminal Of ECM
G05577188Courtesy 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.

VOLTAGE SPECIFICATION CHART

Symbols (Terminal No.) Wiring Colors Terminal Descriptions Conditions STD Voltages
BATT (E47-3) - E1 (B3-1) L-BR Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
+BM (E47-7) - E1 (B3-1) GR-BR Power source of throttle motor Always 11 to 14 V
IGSW (E47-9) - E1 (B3-1) B-O - BR Ignition switch Ignition switch ON 11 to 14 V
+B(E47-1)-E1 (B3-1) B-BR Power source of ECM Ignition switch ON 11 to 14 V
+B2 (E47-2) - E1 (B3-1) B-BR Power source of ECM Ignition switch ON 11 to 14 V
OC1+(B3-17)-OC1-(B3-16) G-Y - L-B Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see  1waveform 1)
OC2+ (B3-15) - OC2- (B3-14) L-W - L-R Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see  1waveform 1)
MREL (E47-8) - E1 (B3-1) W-G - BR EFI relay Ignition switch ON 11 to 14 V
VC(B1-23)-E2(B1-28) L-R - W-G Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
VG(B1-30)-E2G(B1-29) R-R-W Mass air flow meter Idling, Transmission gear neutral, A/C switch OFF 0.5 to 3.0 V
THA(B1-22)-E2(B1-28) R-B - W-G Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
THW(B1-21)-E2(B1-28) B-W-G Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
TVTA1 (B1-20)-E2(B1-28) G-B - W-G Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.2 V
Ignition switch ON, Throttle valve fully open 3.2 to 4.8 V
VTA2(B1-19)-E2(B1-28) G-W - W-G 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 4.5 to 5.0 V
VPA (E47-18) - EPA (E47-20) W-R - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released 0.5 to 1.1 V
Ignition switch ON, Accelerator pedal fully depressed 2.6 to 4.5 V
VPA2 (E47-19) - EPA2 (E47-21) R-B - V-W Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released 1.2 to 2.0 V
Ignition switch ON, Accelerator pedal fully depressed 3.4 to 5.0 V
VCPA (E47-26) - EPA (E47-20) B-Y - LG-B Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
VCP2 (E47-27) - EPA2 (E47-21) W-L - V-W Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
HA1A (B2-2) - E04 (B2-7) HA2A(B2-1)-E05(B2-6) R-L - W-B
B-W - W-B		 A/F sensor heater Idling with warm engine Pulse generation (see  2waveform 2)
Ignition switch ON 11 to 14 V
A1A+(B2-22)-E1 (B3-1) P-BR A/F sensor Ignition switch ON 3.3 V(1)
A2A+(B2-23) - E1 (B3-1) Y-BR A/F sensor Ignition switch ON 3.3 V(1)
A1A-(B2-30) - E1 (B3-1) L-BR A/F sensor Ignition switch ON 2.9 V(1)
A2A-(B2-31)-E1 (B3-1) BR-BR A/F sensor Ignition switch ON 2.9 V(1)
HT1B(B1-1)-E1
(B3-1) HT2B (B2-5) - E1 (B3-1)		 G-BR
L-BR		 Heated oxygen sensor heater Idling Below 3.0 V
Ignition switch ON 11 to 14 V
OX1B(B1-18)-E2(B1-28)
OX2B(B2-33)-E2(B1-28)		 W-W-G
B-W-G		 Heated oxygen sensor Maintain engine speed at 2,500 rpm for 2 minutes after warming up Pulse generation (see  3waveform 3)
#10(B3-2)-E01 (B1-7) R-L - BR Fuel injector assembly Ignition switch ON 11 to 14 V
#20 (B3-3) - E01 (B1-7) G-BR Idling Pulse generation (see  4waveform 4)
#30 (B3-4) - E01 (B1-7) R-BR
#40 (B3-5) - E01 (B1-7) W-BR
#50 (B3-6) - E01 (B1-7) Y-BR
#60 (B3-7) - E01 (B1-7) L-BR
KNK1 (B2-29) - EKNK (B2-28) B-W Knock sensor Maintain engine speed at 4,000 rpm after warming up Pulse generation (see  5waveform 5)
KNK2 (B2-21) - EKN2 (B2-20) G-R Knock sensor Maintain engine speed at 4,000 rpm after warming up Pulse generation (see  5waveform 5)
W1+ (B3-19) - VV1- (B3-29) R-G Variable Valve Timing (VVT) sensor Idling Pulse generation (see  6waveform 6)
W2+ (B3-18) - VV2- (B3-28) Y-L Variable Valve Timing (VVT) sensor Idling Pulse generation (see  6waveform 6)
NE+(B3-21)-NE-(B3-20) B-W Crankshaft position sensor Idling Pulse generation (see  6waveform 6)
IGT1 (B1-8)-E1 (B3-1) Y-R - BR Ignition coil assembly (ignition signal) Idling Pulse generation (see  7waveform 7)
IGT2(B1-9)-E1 (B3-1) G-BR
IGT3(B1-10)-E1 (B3-1) B-W - BR
IGT4(B1-11)-E1 (B3-1) Y-G - BR
IGT5(B1-12)-E1 (B3-1) GR-BR
IGT6(B1-13)-E1 (B3-1) L-BR
IGF1 (B1-24)-E1 (B3-1) W-R - BR Ignition coil assembly (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
Idling Pulse generation (see  7waveform 7)
PRG(B1-34)-E01 (B1-7) G-Y - BR Purge VSV Ignition switch ON 11 to 14 V
Idling Pulse generation (see  8waveform 8)
SPD (E46-8) - E1 (B3-1) V-R - BR Speed signal from combination meter Ignition switch ON, Rotate driving wheel slowly Pulse generation (see  9waveform 9)
STA(B3-11)-E1 (B3-1) B-Y - BR Starter signal Cranking 11 to 14 V
STP(E47-15)-E1 (B3-1) G-Y - BR Stop light switch Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
ST1-(E47-16)-E1 (B3-1) R-L - BR Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal depressed Below 1.5 V
Ignition switch ON, Brake pedal released 7.5 to 14 V
NSW(B2-8)-E1 (B3-1) L-Y - BR Park/Neutral position switch Ignition switch ON, Shift lever position in P or N Below 3.0 V
Ignition switch ON, Shift lever position other than P and N 11 to 14 V
M+(B1-5)-ME01 (B2-3) P-W-B Throttle motor Idling with warm engine Pulse generation (see  10waveform 10)
M-(B1-4)-ME01 (B2-3) L-W-B Throttle motor Idling with warm engine Pulse generation (see  11waveform 11)
FC(E47-10)-E1 (B3-1) GR-B - BR Fuel pump control Ignition switch ON 11 to 14 V
FPR (B3-30) - E1 (B3-1) Y-B - BR Fuel pump control Ignition switch ON 11 to 14 V
W (E46-30) - E1 (B3-1) R-B - BR MIL Ignition switch ON Below 3.0 V
Idling 11 to 14 V
ELS(E46-13)-E1 (B3-1) Y-B - BR Electric load Defogger or taillight switch OFF 0 to 1.5 V
Defogger or taillight switch ON 7.5 to 14 V
ELS2(E46-12)-E1 (B3-1) Y-G - BR Electric load Voltage inverter OFF 0 to 1.5 V
Voltage inverter ON 7.5 to 14 V
TC (E47-23) - E1 (B3-1) P-L - BR Terminal TC of DLC 3 Ignition switch ON 11 to 14 V
TACH(E46-1)-E1 (B3-1) B-W - BR Engine speed Idling Pulse generation (see  12waveform 12)
ACIS(B1-33)-E1 (B3-1) W-L - BR VSV for ACIS Ignition switch ON 11 to 14 V
PSW(B3-10)-E1 (B3-1) G-W - BR PIS pressure switch Ignition switch ON 11 to 14 V
VPMP (E47-5) - E1 (B3-1) R-G - BR Vent valve (built into canister pump module) Ignition switch ON 11 to 14 V
MPMP (E47-6) - E1 (B3-1) O-BR Leak detection pump (built into canister pump module) Leak detection pump OFF 0 to 3V
Leak detection pump ON 11 to 14 V
PPMP (E47-22) - E2 (B1-28) R-W-G Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
F/PS (E46-32) - E1 (B3-1) L-BR Airbag sensor assembly Idling with warm engine Pulse generation (see  13waveform 13)
CANH (E46-33) - E1 (B3-1) W-BR CAN communication line Ignition switch ON Pulse generation (see  14waveform 14)
CANL (E46-34) - E1 (B3-1) R-BR CAN communication line Ignition switch ON Pulse generation (see  15waveform 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 SIGNAL REFERENCE CHART

    ECM Terminal Names Between OC1+ and OC1- or OC2+ and OC2-
    Tester Ranges 5 V/DIV, 1 msec/DIV
    Conditions Idling
    Fig 2: Camshaft Timing Oil Control Valve - Waveform Graph
    G05197709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  2. WAVEFORM 2 

    Air fuel ratio sensor heater 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names CH1: Between HA1A and E04
    CH2: Between HA2A and E05
    Tester Ranges 5 V/DIV, 10 msec/DIV
    Conditions Idling with warm engine
    Fig 3: Air Fuel Ratio Sensor Heater - Waveform Graph
    G05577190Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength varies in accordance with the engine operating condition.

  3. WAVEFORM 3 

    Heated oxygen sensor 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names Between 0X1B and E2 or OX2B 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
    Fig 4: Heated Oxygen Sensor - Waveform Graph
    G05197710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    In the DATA LIST, item O2S B1S2 or O2S B2S2 shows the ECM input values from the heated oxygen sensor.

  4. WAVEFORM 4 

    Fuel injector 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names Between #10 (to 60) and E01
    Tester Ranges 20 V/DIV, 20 msec/DIV
    Conditions Idling
    Fig 5: Fuel Injector - Waveform Graph
    G05577192Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  5. WAVEFORM 5 

    Knock sensor 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names Between KNK1 and EKNK or KNK2 and EKN2
    Tester Ranges 500 mV/DIV, 0.01 to 1 msec./DIV
    Conditions Engine speed maintained at 4,000 rpm after warming up engine
    Fig 6: Knock Sensor - Waveform Graph
    G05577193Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    • The wavelength becomes shorter as the engine rpm increases.
    • The waveforms and amplitudes displayed on the tester differ slightly depending on the vehicle.
  6. WAVEFORM 6 
    1. VVT sensor
    2. Crankshaft position sensor
      WAVEFORM SIGNAL REFERENCE CHART

      ECM Terminal Names
      1. Between NE+ and NE-
      2. Between VV1+ and VV1- or VV2+ and VV2-
      Tester Ranges 2 V/DIV, 20 msec/DIV
      Conditions Idling
      Fig 7: VVT Sensor And Crankshaft Position Sensor - Waveform Graph
      G05197713Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

  7. WAVEFORM 7 
    1. Igniter IGT signal (from ECM to igniter)
    2. Igniter IGF signal (from igniter to ECM)
      WAVEFORM SIGNAL REFERENCE CHART

      ECM Terminal Names
      1. Between IGT (1 to 6) and E1
      2. Between IGF1 and E1
      Tester Ranges 2 2 V/DIV, 20 msec/DIV
      Conditions Idling
      Fig 8: Igniter IGT Signal (From ECM To Igniter) - Waveform Graph
      G05197714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

  8. WAVEFORM 8 

    Purge VSV 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names Between PRG and E01
    Tester Ranges 10 V/DIV, 50 msec/DIV
    Conditions Idling
    Fig 9: Purge VSV - Waveform Graph
    G05197715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

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

  9. WAVEFORM 9 

    Vehicle speed signal 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names Between SPD and E1
    Tester Ranges 2 V/DIV, 20 msec/DIV
    Conditions Driving at 12 mph (20 km/h)
    Fig 10: Vehicle Speed Signal - Waveform Graph
    G05197716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

  10. WAVEFORM 10 

    Throttle actuator positive terminal 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names Between M+ and ME01
    Tester Ranges 5 V/DIV, 1 msec/DIV
    Conditions Idling with warm engine
    Fig 11: Throttle Actuator Positive Terminal - Waveform Graph
    G05197717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

  11. WAVEFORM 11 

    Throttle actuator negative terminal 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names Between M- and ME01
    Tester Ranges 5 V/DIV, 1 msec/DIV
    Conditions Idling with warm engine
    Fig 12: Throttle Actuator Negative Terminal - Waveform Graph
    G05197718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

  12. WAVEFORM 12 

    Engine speed signal 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names Between TACH and E1
    Tester Ranges 5V/DIV, "Lo msec./DIV
    Conditions Idling
    Fig 13: Engine Speed Signal - Waveform Graph
    G05197719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  13. WAVEFORM 13 

    Airbag sensor assembly 

    WAVEFORM SIGNAL REFERENCE CHART

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

    CAN communication signal (Reference) 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names Between CANH and E1
    Tester Ranges 1 V/DIV, 10μsec./DIV
    Conditions Ignition switch ON
    Fig 15: CAN Communication Signal (Reference) - Waveform Graph
    G04828030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength varies depending on the CAN communication signal.

  15. WAVEFORM 15 

    CAN communication signal (Reference) 

    WAVEFORM SIGNAL REFERENCE CHART

    ECM Terminal Names Between CANL and E1
    Tester Ranges 1 V/DIV, 10μsec./DIV
    Conditions Ignition switch ON
    Fig 16: CAN Communication Signal (Reference) - Waveform Graph
    G05197722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength varies depending on the CAN communication signal.

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