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Terminals Of ECM

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying ECM Terminal
G05197708Courtesy 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.

TERMINAL DESCRIPTIONS

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
IG SW (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 )
OC2+ (E6-15) - OC2 - (E6-14) L-W - L-R Camshaft timing oil control valve(OCV) Ignition switch ON Pulse generation (see WAVEFORM 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) HT2B (E5-5) - E1 (E6-1) G - BR L - BR Heated oxygen sensor heater Idling Below 3.0 V
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 2,500 rpm for 2 minutes after warming up Pulse generation (see WAVEFORM 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 )
#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 4,000 rpm after warming up Pulse generation (see WAVEFORM 4 )
KNK2 (E5-21) - EKN2 (E5-20) G-R Knock sensor Maintain engine speed at 4,000 rpm after warming up Pulse generation (see WAVEFORM 4 )
VV1+ (E6-19) - VV1- (E6-29) R-G Variable valve timing (VVT) sensor Idling Pulse generation (see WAVEFORM 5 )
VV2+ (E6-18) - VV2- (E6-28) Y-L Variable valve timing (VVT) sensor Idling Pulse generation (see WAVEFORM 5 )
NE+ (E6-21) - NE- (E6-20) B-W Crankshaft position sensor Idling Pulse generation (see WAVEFORM 5 )
IGT1 (E4-8) - E1 (E6-1) P - BR Ignition coil with igniter (ignition signal) Idling Pulse generation (see WAVEFORM 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 )
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 )
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 )
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 )
M- (E4-4) - ME01 (E5-3) L - W-B Throttle motor Idling with warm engine Pulse generation (see WAVEFORM 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 14V
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 DLC3 Ignition switch ON 9 to 14 V
TACH (E7-1) - E1 (E6-1) B-W - BR Engine speed Idling Pulse generation (see WAVEFORM 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 )
CANH (E7-33) - E1 (E6-1) B - BR CAN communication line Ignition switch ON Pulse generation (see WAVEFORM 13 )
CANL (E7-34) - E1 (E6-1) W - 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) 

    WAVEFORM REFERENCE

    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 

    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 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 

    WAVEFORM REFERENCE

    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 

    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 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
      G05197712Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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

      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)
      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

      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 

    WAVEFORM REFERENCE

    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 the illustration, 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 

    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)

    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 

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

    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 

    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 12: Identifying Waveform 11
    G05197719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 Waveform 12
    G05197720Courtesy 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, 10 μsec./DIV
    Conditions Stop engine and 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 

    WAVEFORM REFERENCE

    ECM Terminal Names Between CANL and E1
    Tester Ranges 1 V/DIV, 10 μsec./DIV
    Conditions Stop engine and 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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