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Terminals Of ECM

Fig 1: Identifying ECM Terminals
G04459709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.

Fig 1 can be used as a reference to identify the ECM terminal locations.

ECM 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 9 V 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) Y - W-B Injector Ignition switch ON Between 9 V and 14 V
#20 (E3-2) - E01 (E3-7) B - W-B
#30 (E3-3) - E01 (E3-7) W - W-B
#40 (E3-4) - E01 (E3-7) L - W-B
#10 (E3-1) - E01 (E3-7) Y - W-B Injector Idling Pulse generation (see waveform 1)
#20 (E3-2) - E01 (E3-7) B - W-B
#30 (E3-3) - E01 (E3-7) W - W-B
#40 (E3-4) - E01 (E3-7) L - W-B
IGT1 (E3-8) - E1 (E3-5) R-L - BR Ignition coil with igniter (ignition signal) Idling Pulse generation (see waveform 2)
IGT2 (E3-9) - E1 (E3-5) Y-G - BR
IGT3 (E3-10) - E1 (E3-5) GR - BR
IGT4 (E3-11) - E1 (E3-5) W - BR
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-O - 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 - BR MIL Idling Between 9 V and 14 V
W (E6-11) - E01 (E3-7) R-Y - BR 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 (1 OF 13)

      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: Waveform 1 Graph
      G04459710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 
    1. Igniter IGT signal (from ECM to igniter)
    2. Igniter IGF signal (from igniter to ECM)
      WAVEFORM REFERENCE (2 OF 13)

      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: Waveform 2 Graph
      G04459711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. WAVEFORM 3 
    1. Camshaft position sensor
    2. Crankshaft position sensor
      WAVEFORM REFERENCE (3 OF 13)

      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: Waveform 3 Graph
      G04459712Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. WAVEFORM 4 
    1. Throttle actuator positive terminal
      WAVEFORM REFERENCE (4 OF 13)

      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
      G04459713Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. WAVEFORM 5 
    1. Throttle actuator negative terminal
      WAVEFORM REFERENCE (5 OF 13)

      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
      G04459714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. WAVEFORM 6 
    1. Heated oxygen sensor
      WAVEFORM REFERENCE (6 OF 13)

      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
      G04459715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. WAVEFORM 7 
    1. Knock sensor
      WAVEFORM REFERENCE (7 OF 13)

      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
        G04459716Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. WAVEFORM 8 
    1. Camshaft timing oil control valve (OCV)
      WAVEFORM REFERENCE (8 OF 13)

      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
      G04459717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. WAVEFORM 9 
    1. EVAP VSV
      WAVEFORM REFERENCE (9 OF 13)

      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 Fig 10, check the waveform again after idling for 10 minutes or more.

      Fig 10: Waveform 9 Graph
      G04459718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. WAVEFORM 10 
    1. Engine speed signal
      WAVEFORM REFERENCE (10 OF 13)

      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
      G04459719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. WAVEFORM 11 
    1. Vehicle speed signal
      WAVEFORM REFERENCE (11 OF 13)

      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: Waveform 11 Graph
      G04459720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. WAVEFORM 12 
    1. Terminal SIL of DLC3
      WAVEFORM REFERENCE (12 OF 13)

      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: Waveform 12 Graph
      G04459721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 
    1. Airbag sensor assembly
      WAVEFORM REFERENCE (13 OF 13)

      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
      G04459722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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