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Terminals Of ECM

Fig 1: Identifying ECM Terminals
G05108578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The standard normal voltage between each pair of ECM terminals is shown in SYMBOLS REFERENCE AND TERMINAL DESCRIPTIONS TABLE . 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 Fig 1 above can be used as a reference to identify the ECM terminal locations.

SYMBOLS REFERENCE AND TERMINAL DESCRIPTIONS TABLE

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 WAVEFORM 1 )
OC2+ (B3-15) - OC2 - (B3-14) L-W - L-R Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see WAVEFORM 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, Shift lever position P or N, 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
VTA1 (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 (E7-20) 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 Below 3.0 V
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 WAVEFORM 2 )
#10 (B3-2) - E01 (B1-7) R-L - BR Injector Ignition switch ON 11 to 14 V
#20 (B3-3) - E01 (B1-7) G - BR Idling Pulse generation (see WAVEFORM 3 )
#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 WAVEFORM 4 )
KNK2 (B2-21) - EKN2 (B2-20) G - R Knock sensor Maintain engine speed at 4,000 rpm after warming up Pulse generation (see WAVEFORM 4 )
VV1+ (B3-19) - VV1- (B3-29) R - G Variable valve timing (VVT) sensor Idling Pulse generation (see WAVEFORM 5 )
VV2+ (B3-18) - VV2- (B3-28) Y - L Variable valve timing (VVT) sensor Idling Pulse generation (see WAVEFORM 5 )
NE+ (B3-21) - NE- (B3-20) B - W Crankshaft position sensor Idling Pulse generation (see WAVEFORM 5 )
IGT1 (B1-8) - E1 (B3-1) Y-R - BR Ignition coil with igniter (ignition signal) Idling Pulse generation (see WAVEFORM 6 )
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 with igniter (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
Idling Pulse generation (see WAVEFORM 6 )
PRG (B1-34) - E01 (B1-7) G-Y - BR Purge VSV Ignition switch ON 11 to 14 V
Idling Pulse generation (see WAVEFORM 7 )
SPD (E46-8) - E1 (B3-1) V-R - BR Speed signal from combination meter Ignition switch ON, Rotate driving wheel slowly Pulse generation (see WAVEFORM 8 )
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 WAVEFORM 9 )
M- (B1-4) - ME01 (B2-3) L - W-B Throttle motor Idling with warm engine Pulse generation (see WAVEFORM 10 )
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 WAVEFORM 11 )
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 P/S 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 3 V
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 WAVEFORM 12 )
CANH (E46-33) - E1 (B3-1) W - BR CAN communication line Ignition switch ON Pulse generation (see WAVEFORM 13 )
CANL (E46-34) - E1 (B3-1) R - BR CAN communication line Ignition switch ON Pulse generation (see WAVEFORM 14 )
(1) The ECM terminal voltage is constant regardless of the output voltage from the sensor.
  1. WAVEFORM 1 

    Camshaft timing oil control valve (OCV) 

    CAMSHAFT TIMING OIL CONTROL VALVE WAVEFORM

    ECM Terminal Names Between OC1+ and OC1- or OC2+ and OC2-
    Tester Ranges 5 V/DIV, 1 msec./DIV
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 2: Identifying Waveform 1
    G05197709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 

    Heated oxygen sensor 

    HEATED OXYGEN SENSOR WAVEFORM

    ECM Terminal Names Between OX1B 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

    HINT:

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

    Fig 3: Identifying Waveform 2
    G05197710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. WAVEFORM 3 

    Fuel injector 

    FUEL INJECTOR WAVEFORM

    ECM Terminal Names Between #10 (to 60) and E01
    Tester Ranges 30 V/DIV, 20 msec./DIV
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 4: Identifying Waveform 3
    G05197711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. WAVEFORM 4 

    Knock sensor 

    KNOCK SENSOR WAVEFORM

    ECM Terminal Names Between KNK1 and EKNK or KNK2 and EKN2
    Tester Ranges 1 V/DIV, 0.01 to 1 msec./DIV
    Conditions Engine speed maintained at 4,000 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 5: Identifying Waveform 4
      G05108582Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. WAVEFORM 5 
    1. VVT sensor
    2. Crankshaft position sensor
      CRANKSHAFT POSITION SENSOR WAVEFORM

      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

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 6: Identifying Waveform 5
      G05197713Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. WAVEFORM 6 
    1. Igniter IGT signal (from ECM to igniter)
    2. Igniter IGF signal (from igniter to ECM)
      IGNITER IGT SIGNAL

      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

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 7: Identifying Waveform 6
      G05197714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. WAVEFORM 7 

    Purge VSV 

    PURGE VSV WAVEFORM

    ECM Terminal Names Between PRG and E01
    Tester Ranges 10 V/DIV, 50 msec./DIV
    Conditions Idling

    HINT:

    If the waveform is not similar to Fig 8, check the waveform again after idling for 10 minutes or more.

    Fig 8: Identifying Waveform 7
    G05197715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. WAVEFORM 8 

    Vehicle speed signal 

    VEHICLE SPEED SIGNAL WAVEFORM

    ECM Terminal Names Between SPD and E1
    Tester Ranges 2 V/DIV, 20 msec./DIV
    Conditions Driving at 12 mph (20 km/h)

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

    Fig 9: Identifying Waveform 8
    G05197716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. WAVEFORM 9 

    Throttle actuator positive terminal 

    THROTTLE ACTUATOR POSITIVE TERMINAL WAVEFORM

    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 10: Identifying Waveform 9
    G05197717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. WAVEFORM 10 

    Throttle actuator negative terminal 

    THROTTLE ACTUATOR NEGATIVE TERMINAL WAVEFORM

    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 11: Identifying Waveform 10
    G05197718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. WAVEFORM 11 

    Engine speed signal 

    ENGINE SPEED SIGNAL WAVEFORM

    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 12: Identifying Waveform 11
    G05197719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. WAVEFORM 12 

    Airbag sensor assembly 

    AIRBAG SENSOR ASSEMBLY WAVEFORM

    ECM Terminal Names Between F/PS and E1
    Tester Ranges 5 V/DIV, 500 msec./DIV
    Conditions Idling with warm engine
    Fig 13: Identifying Waveform 12
    G05197720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 

    CAN communication signal (Reference) 

    CAN COMMUNICATION SIGNAL (REFERENCE)

    ECM Terminal Names Between CANH and E1
    Tester Ranges 1 V/DIV, 10 μsec./DIV
    Conditions Ignition switch ON

    HINT:

    The wavelength varies depending on the CAN communication signal.

    Fig 14: Identifying Waveform 13
    G04828030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. WAVEFORM 14 

    CAN communication signal (Reference) 

    CAN COMMUNICATION SIGNAL (REFERENCE)

    ECM Terminal Names Between CANL and E1
    Tester Ranges 1 V/DIV, 10 μsec./DIV
    Conditions Ignition switch ON

    HINT:

    The wavelength varies depending on the CAN communication signal.

    Fig 15: Identifying Waveform 14
    G05197722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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