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Terminals Of ECM

Fig 1: Identifying ECM Connector Terminals
G05676594Courtesy 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

Symbols (Terminal No.) Wiring Colors Terminal Descriptions Conditions STD Voltages
BATT (E8-3) - E1 (E6-1) L-BR Battery (for measuring the battery voltage and for the ECM memory) Always 9 to 14 V
+BM (E8-7) - E1 (E6-1) LG-BR Power source of throttle motor Always 9 to 14 V
IGSW (E8-9) - E1 (E6-1) O-BR Ignition switch Ignition switch ON 9 to 14 V
+B (E8-1) - E1 (E6-1) B-BR Power source of ECM Ignition switch ON 9 to 14 V
+B2 (E8-2) - E1 (E6-1) B-BR Power source of ECM Ignition switch ON 9 to 14 V
OC1+ (E6-17) - OC1- (E6-16) G-Y - L-B Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see waveform 1 1)
OC2+ (E6-15) - OC2- (E6-14) L-W - L-R Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see waveform 1 1)
MREL (E8-8) - E1 (E6-1) G-W - BR EFI relay Ignition switch ON 9 to 14 V
VC (E4-23) - E2 (E4-28) L - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.0 V
VG (E4-30) - E2G (E4-29) R-Y - R-W Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
THA (E4-22) - E2 (E4-28) R-L - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
THW (E4-21) - E2 (E4-28) Y-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
VTA1 (E4-20) - E2 (E4-28) G-B - BR Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.2 V
VTA1 (E4-20) - E2 (E4-28) G-B - BR Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully open 3.2 to 4.8 V
VTA2 (E4-19) - E2 (E4-28) G-W - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released 2.1 to 3.1 V
VTA2 (E4-19) - E2 (E4-28) G-W - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully depressed 4.5 to 5.0 V
VPA (E8-18) - EPA (E8-20) R-Y - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released 0.5 to 1.1 V
VPA (E8-18) - EPA (E8-20) R-Y - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully depressed 2.6 to 4.5 V
VPA2 (E8-19) - EPA2 (E8-21) GR-B - R-B Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released 1.2 to 2.0 V
VPA2 (E8-19) - EPA2 (E8-21) GR-B - R-B Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully depressed 3.4 to 5.0 V
VCPA (E8-26) - EPA (E8-20) R - LG-B Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.0 V
VCP2 (E8-27) - EPA2 (E8-21) L-W - R-B Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.0 V
HA1A (E5-2) - E04 (E5-7) R - W-B A/F sensor heater Idling Below 3.0 V
HA2A (E5-1) - E05 (E5-6) B-W - W-B
HA1A (E5-2) - E04 (E5-7) R - W-B A/F sensor heater Ignition switch ON 9 to 14 V
HA2A (E5-1) - E05 (E5-6) B-W - W-B
A1A+ (E5-22) - E1 (E6-1) P - BR A/F sensor Ignition switch ON 3.3 V(1)
A2A+ (E5-23) - E1 (E6-1) W - BR A/F sensor Ignition switch ON 3.3 V(1)
A1A- (E5-30) - E1 (E6-1) L - BR A/F sensor Ignition switch ON 2.9 V(1)
A2A- (E5-31) - E1 (E6-1) R - BR A/F sensor Ignition switch ON 2.9 V(1)
HT1B (E4-1) - E1 (E6-1) G - BR Heated oxygen sensor heater Idling Below 3.0 V
HT2B (E5-5) - E1 (E6-1) L - BR
HT1B (E4-1) - E1 (E6-1) G - BR Heated oxygen sensor heater Ignition switch ON 9 to 14 V
HT2B (E5-5) - E1 (E6-1) L - BR
OX1B (E4-18) - E2 (E4-28) W - BR Heated oxygen sensor Maintain engine speed at 2500 rpm for 2 minutes after warming up Pulse generation (see waveform 2 2)
OX2B (E5-33) - E2 (E4-28) B - BR
#10 (E6-2) - E01 (E4-7) R-L - W-B Injector Ignition switch ON 9 to 14 V
#20 (E6-3) - E01 (E4-7) B - W-B
#30 (E6-4) - E01 (E4-7) R - W-B
#40 (E6-5) - E01 (E4-7) G - W-B
#50 (E6-6) - E01 (E4-7) Y - W-B
#60 (E6-7) - E01 (E4-7) L - W-B
#10 (E6-2) - E01 (E4-7) R-L - W-B Injector Idling Pulse generation (see waveform 3 3)
#20 (E6-3) - E01 (E4-7) B - W-B
#30 (E6-4) - E01 (E4-7) R - W-B
#40 (E6-5) - E01 (E4-7) G - W-B
#50 (E6-6) - E01 (E4-7) Y - W-B
#60 (E6-7) - E01 (E4-7) L - W-B
KNK1 (E5-29) - EKNK (E5-28) B - W Knock sensor Maintain engine speed at 4000 rpm after warming up Pulse generation (see waveform 4 4)
KNK2 (E5-21) - EKN2 (E5-20) G - R Knock sensor Maintain engine speed at 4000 rpm after warming up Pulse generation (see waveform 4 4)
VV1+ (E6-19) - VV1- (E6-29) R - G Variable valve timing (VVT) sensor Idling Pulse generation (see waveform 5 5)
VV2+ (E6-18) - VV2- (E6-28) Y - L Variable valve timing (VVT) sensor Idling Pulse generation (see waveform 5 5)
NE+ (E6-21) - NE- (E6-20) B - W Crankshaft position sensor Idling Pulse generation (see waveform 5 5)
IGT1 (E4-8) - E1 (E6-1) P - BR Ignition coil with igniter (ignition signal) Idling Pulse generation (see waveform 6 6)
IGT2 (E4-9) - E1 (E6-1) P-L - BR
IGT3 (E4-10) - E1 (E6-1) LG - BR
IGT4 (E4-11) - E1 (E6-1) LG-B - BR
IGT5 (E4-12) - E1 (E6-1) GR - BR
IGT6 (E4-13) - E1 (E6-1) G - BR
IGF1 (E4-24) - E1 (E6-1) W-R - BR Ignition coil with igniter (ignition confirmation signal) Ignition switch ON 4.5 to 5.0 V
IGF1 (E4-24) - E1 (E6-1) W-R - BR Ignition coil with igniter (ignition confirmation signal) Idling Pulse generation (see waveform 6 6)
PRG (E4-34) - E1 (E6-1) Y - BR Purge VSV Ignition switch ON 9 to 14 V
PRG (E4-34) - E1 (E6-1) Y - BR Purge VSV Idling Pulse generation (see waveform 7 7)
SPD (E7-8) - E1 (E6-1) V-W - BR Speed signal from combination meter Ignition switch ON, Rotate driving wheel slowly Pulse generation (see waveform 8 8)
STA (E6-11) - E1 (E6-1) B-Y - BR Starter signal Cranking 9 to 14 V
STP (E8-15) - E1 (E6-1) L - BR Stop light switch Brake pedal depressed 7.5 to 14 V
STP (E8-15) - E1 (E6-1) L - BR Stop light switch Brake pedal released Below 1.5 V
ST1- (E8-16) - E1 (E6-1) V-W - BR Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal depressed Below 1.5 V
ST1- (E8-16) - E1 (E6-1) V-W - BR Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal released 7.5 to 14 V
NSW (E5-8) - E1 (E6-1) V - BR Park/Neutral position switch Ignition switch ON, Shift lever position in P or N Below 3.0 V
NSW (E5-8) - E1 (E6-1) V - BR Park/Neutral position switch Ignition switch ON, Shift lever position other than P and N 9 to 14 V
M+ (E4-5) - ME01 (E5-3) P - W-B Throttle motor Idling with warm engine Pulse generation (see waveform 9 9)
M- (E4-4) - ME01 (E5-3) L - W-B Throttle motor Idling with warm engine Pulse generation (see waveform 10 10)
FC (E8-10) - E1 (E6-1) L-B - BR Fuel pump control Ignition switch ON 9 to 14 V
FPR (E6-30) - E1 (E6-1) Y-R - BR Fuel pump control Ignition switch ON 9 to 14 V
W (E7-30) - E1 (E6-1) BR - BR MIL Ignition switch ON Below 3.0 V
W (E7-30) - E1 (E6-1) BR - BR MIL Idling 9 to 14 V
ELS (E7-13) - E1 (E6-1) G - BR Electric load Defogger switch OFF 0 to 1.5 V
ELS (E7-13) - E1 (E6-1) G - BR Electric load Defogger switch ON 7.5 to 14 V
ELS2 (E7-12) - E1 (E6-1) B-W - BR Electric load Taillight switch OFF 0 to 1.5 V
ELS2 (E7-12) - E1 (E6-1) B-W - BR Electric load Taillight switch ON 7.5 to 14 V
TC (E8-23) - E1 (E6-1) P-B - BR Terminal TC of DLC 3 Ignition switch ON 9 to 14 V
TACH (E7-1) - E1 (E6-1) B-W - BR Engine speed Idling Pulse generation (see waveform 11 11)
ACIS (E4-33) - E1 (E6-1) W-L - BR VSV for ACIS Ignition switch ON 9 to 14 V
PSW (E6-10) - E1 (E6-1) G-W - BR P/S pressure switch Ignition switch ON 9 to 14 V
VPMP (E8-5) - E1 (E6-1) V-W - BR Vent valve (built into canister pump module) Ignition switch ON 9 to 14 V
MPMP (E8-6) - E1 (E6-1) G - BR Leak detection pump (built into canister pump module) Leak detection pump OFF 0 to 3 V
MPMP (E8-6) - E1 (E6-1) G - BR Leak detection pump (built into canister pump module) Leak detection pump ON 9 to 14 V
PPMP (E8-22) - E2 (E4-28) GR - BR Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
F/PS (E7-32) - E1 (E6-1) R - BR Airbag sensor assembly Idling with warm engine Pulse generation (see waveform 12 12)
CANH (E7-33) - E1 (E6-1) B - BR CAN communication line Ignition switch ON Pulse generation (see waveform 13 13)
CANL (E7-34) - E1 (E6-1) W - BR CAN communication line Ignition switch ON Pulse generation (see waveform 14 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) 

    WAVEFORM REFERENCE

    ECM Terminal Names Between OC1+ and OC1- or OC2+ and OC2-
    Tester Ranges 5 V/DIV, 1 msec./DIV
    Conditions Idling
    Fig 2: Identifying Camshaft Timing Oil Control Valve Waveform
    G05676595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  2. WAVEFORM 2 

    Heated oxygen sensor 

    WAVEFORM REFERENCE

    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 2500 rpm for 2 minutes after warming up sensor
    Fig 3: Identifying Heated Oxygen Sensor Waveform
    G05676596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    In the Data List, item O2S B1 S2 or O2S B2 S2 shows the ECM input values from the heated oxygen sensor.

  3. WAVEFORM 3 

    Fuel injector 

    WAVEFORM REFERENCE

    ECM Terminal Names Between #10 (to 60) and E01
    Tester Ranges 30 V/DIV, 20 msec./DIV
    Conditions Idling
    Fig 4: Identifying Fuel Injector Waveform
    G05676597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  4. WAVEFORM 4 

    Knock sensor 

    WAVEFORM REFERENCE

    ECM Terminal Names Between KNK1 and EKNK or KNK2 and EKN2
    Tester Ranges 0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
    Conditions Engine speed maintained at 4000 rpm after warming up engine
    Fig 5: Identifying Knock Sensor Waveform
    G05676598Courtesy 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.
  5. WAVEFORM 5 
    1. VVT sensor
    2. Crankshaft position sensor
      WAVEFORM REFERENCE

      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 6: Identifying Crankshaft Position Sensor Waveform
      G05676599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

  6. WAVEFORM 6 
    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 6) and E1
      2. Between IGF1 and E1
      Tester Ranges 2 2 V/DIV, 20 msec./DIV
      Conditions Idling
      Fig 7: Identifying IGT And IGF Signal Waveform
      G05676600Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

  7. WAVEFORM 7 

    Purge VSV 

    WAVEFORM REFERENCE

    ECM Terminal Names Between PRG and E01
    Tester Ranges 10 V/DIV, 50 msec./DIV
    Conditions Idling
    Fig 8: Identifying Purge VSV Waveform
    G05676601Courtesy 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.

  8. WAVEFORM 8 

    Vehicle speed signal 

    WAVEFORM REFERENCE

    ECM Terminal Names Between SPD and E1
    Tester Ranges 2 V/DIV, 20 msec./DIV
    Conditions Driving at 12 mph (20 km/h)
    Fig 9: Identifying Vehicle Speed Signal Waveform
    G05676602Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

  9. WAVEFORM 9 

    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
    Fig 10: Identifying Throttle Actuator Positive Terminal Waveform
    G05676603Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

  10. WAVEFORM 10 

    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
    Fig 11: Identifying Throttle Actuator Negative Terminal Waveform
    G05676604Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

  11. WAVEFORM 11 

    Engine speed signal 

    WAVEFORM REFERENCE

    ECM Terminal Names Between TACH and E1
    Tester Ranges 5 V/DIV, 10msec./DIV
    Conditions Idling
    Fig 12: Identifying Engine Speed Signal Waveform
    G05676605Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  12. WAVEFORM 12 

    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 13: Identifying Airbag Sensor Waveform
    G05676606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 

    CAN communication signal 

    WAVEFORM REFERENCE

    ECM Terminal Names Between CANH and E1
    Tester Ranges 1 V/DIV, 10μsec./DIV
    Conditions Stop engine and ignition switch ON
    Fig 14: Identifying CAN Communication Signal Waveform
    G05676607Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength varies depending on the CAN communication signal.

  14. WAVEFORM 14 

    CAN communication signal 

    WAVEFORM REFERENCE

    ECM Terminal Names Between CANL and E1
    Tester Ranges 1 V/DIV, 10μsec./DIV
    Conditions Stop engine and ignition switch ON
    Fig 15: Identifying CAN Communication Signal Waveform
    G05676608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength varies depending on the CAN communication signal.

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