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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 Terminals Of ECM
G05198055Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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 Voltage column. The illustration above can be used as a reference to identify the ECM terminal locations.

VOLTAGE CHART

Symbols (Terminals No.) Wiring Colors Terminal Descriptions Conditions STD Voltages
BATT (E8-3) - E1 (E4-3) L - BR Battery (for measuring battery voltage and for ECM memory) Always 9 to 14 V
+BM (E8-7) - E1 (E4-3) LG - BR Power source of throttle motor Always 9 to 14 V
IG SW (E8-9) - E1 (E4-3) O - BR Ignition switch Ignition switch ON 9 to 14 V
+B (E8-1)-E1 (E4-3) B - BR Power source of ECM Ignition switch ON 9 to 14 V
MREL (E8-8) - E1 (E4-3) G-W - BR EFI relay Ignition switch ON 9 to 14 V
VC (E4-18)-E2 (E4-28) L - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.0 V
VTA1 (E4-20) - E2 (E4-28) G-B - BR Throttle position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released 0.5 to 1.1 V
VTA1 (E4-20) - E2 (E4-28) G-B - BR Throttle position sensor (for engine control) Ignition switch ON, Accelerator pedal fully depressed 3.3 to 4.9 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
VG (E5-28) - E2G (E5-30) R-Y - R-W Mass air flow meter Idling, Shift position P or N, A/C switch OFF 0.5 to 3.0 V
THA (E5-29) - 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 (E4-32) - E2 (E4-28) Y-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
#10 (E5-6) - E01 (E4-7) R-L - W-B Injector Ignition switch ON 9 to 14 V
#20 (E5-5) - E01 (E4-7) B - W-B
#30 (E5-2) - E01 (E4-7) R - W-B
#40 (E5-1) - E01 (E4-7) G - W-B
#10 (E5-6) - E01 (E4-7) R-L - W-B Injector Idling Pulse generation (see WAVEFORM 1 )
#20 (E5-5) - E01 (E4-7) B - W-B
#30 (E5-2) - E01 (E4-7) R - W-B
#40 (E5-1) - E01 (E4-7) G - W-B
IGT1 (E4-17) - E1 (E4-3) P - BR Ignition coil with igniter (ignition signal) Idling Pulse generation (see WAVEFORM 2 )
IGT2 (E4-16) - E1 (E4-3) P-L - BR
IGT3 (E4-15) - E1 (E4-3) LG - BR
IGT4 (E4-14) - E1 (E4-3) LG-B - BR
IGF1 (E4-23) - E1 (E4-3) W-R - BR Ignition coil with igniter (ignition confirmation signal) Ignition switch ON 4.5 to 5.0 V
IGF1 (E4-23) - E1 (E4-3) W-R - BR Ignition coil with igniter (ignition confirmation signal) Idling Pulse generation (see WAVEFORM 2 )
G2 (E4-26) - NE- (E4-34) L - G Camshaft position sensor Idling Pulse generation (see WAVEFORM 3 )
NE+ (E4-27) - NE- (E4-34) R - G Crankshaft position sensor Idling Pulse generation (see WAVEFORM 3 )
FC (E8-25) - E1 (E4-3) L-B - BR Fuel pump control Ignition switch ON 9 to 14 V
FC (E8-25) - E1 (E4-3) L-B - BR Fuel pump control Idling Below 1.5 V
M+ (E4-5) - ME01 (E5-3) P - W-B Throttle actuator Idling with warm engine Pulse generation (see WAVEFORM 4 )
M- (E4-4) - ME01 (E5-3) L - W-B Throttle actuator Idling with warm engine Pulse generation (see WAVEFORM 5 )
A1A+ (E4-21) - E1 (E4-3) P - BR A/F sensor Always (Ignition switch ON) 3.3 V(1)
A1A- (E4-31) - E1 (E4-3) L - BR A/F sensor Always (Ignition switch ON) 3.0 V(1)
OX1B (E4-25) - E2 (E4-28) W - BR Heated oxygen sensor Engine speed maintained 2,500 rpm for 2 minutes after warming up sensor Pulse generation (see WAVEFORM 6 )
HA1A (E4-1) - E04 (E5-7) R - W-B A/F sensor heater Idling Below 3.0 V
HA1A (E4-1) - E04 (E5-7) R - W-B A/F sensor heater Ignition switch ON 9 to 14 V
HT1B (E4-2) - E03 (E5-4) G - W-B Heated oxygen sensor heater Idling Below 3.0 V
HT1B (E4-2) - E03 (E5-4) G - W-B Heated oxygen sensor heater Ignition switch ON 9 to 14 V
KNK1 (E4-29) - EKNK (E4-30) B - W Knock sensor Maintain engine speed 4,000 rpm after warming up engine Pulse generation (see WAVEFORM 7 )
OC1+ (E4-13) - OC1- (E4-12) L - W-W Camshaft timing oil control valve (OCV) Idling Pulse generation (see WAVEFORM 8 )
PRG (E5-23) - E01 (E4-7) Y - W-B Purge VSV Ignition switch ON 9 to 14 V
PRG (E5-23) - E01 (E4-7) Y - W-B Purge VSV Idling Pulse generation (see WAVEFORM 9 )
VPMP (E8-5) - E1 (E4-3) V-W - BR Vent valve (built into canister pump module) Ignition switch ON 9 to 14V
MPMP (E8-6) - E1 (E4-3) G - BR Leak detection pump (built into canister pump module)
  • Leak detection pump OFF
 0 to 3V
MPMP(E8-6) - E1 (E4-3) G - BR Leak detection pump (built into canister pump module)
  • Leak detection pump ON
 9 to 14V
PPMP(E8-31) - E2 (E4-28) GR - BR Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
STA (E8-12) - E1 (E4-3) B-Y - BR Starter signal Shift position N, Ignition switch START 5.5 V or more
STP (E7-4) - E1 (E4-3) L - BR Stop light switch Brake pedal depressed 7.5 to 14 V
STP (E7-4) - E1 (E4-3) L - BR Stop light switch Brake pedal released Below 1.5 V
ST1- (E8-16) - E1 (E4-3) V-W - BR Stop light switch Ignition switch ON, Brake pedal depressed Below 1.5 V
ST1- (E8-16) - E1 (E4-3) V-W - BR Stop light switch Ignition switch ON, Brake pedal released 7.5 to 14 V
W (E7-30) - E01 (E4-7) BR - W-B MIL Idling 9 to 14 V.
W (E7-30) - E01 (E4-7) BR - W-B MIL Ignition switch ON' Below 3.5 V
ELS (E8-15) - E1 (E4-3) G - BR Electric load Tail light switch ON 7.5 to 14 V
ELS (E8-15) - E1 (E4-3) G - BR Electric load Tail light switch OFF 0 to 1.5 V
ELS2 (E7-20) - E1 (E4-3) B-W - BR Electric load Vehicle stationary, Voltage inverter outputs more than 100 W 9 to 14 V
ELS2 (E7-20) - E1 (E4-3) B-W - BR Electric load Vehicle stationary, Voltage inverter outputs 100 W or less 0 to 1.5 V
TACH (E7-1) - E1 (E4-3) B-W - BR Engine speed Idling Pulse generation (see WAVEFORM 10 )
SPD (E7-8) - E1 (E4-3) V-W - BR Speed signal from combination meter Driving at 12 mph (20 km/h) Pulse generation (see WAVEFORM 11 )
TC (E7-17) - E1 (E4-3) P-B - BR Terminal TC of DLC3 Ignition switch ON 9 to 14 V
PSW (E5-32) - E1 (E4-3) G-W - BR Power steering oil pressure switch While turning steering wheel Below 1.5 V
F/PS (E7-32) - E1 (E4-3) R - BR Airbag sensor assembly Idling with warm engine Pulse generation (see WAVEFORM 12 )
NSW (E8-30) - E1 (E4-3) V - BR Park/Neutral switch signal IG switch ON and shift lever P or N position Below 1 V
NSW (E8-30) - E1 (E4-3) V - BR Park/Neutral switch signal IG switch ON and shift lever except P and N 9 to 14 V
(2) CANH (E7-33) - E1 (E4-3) B - BR Communication signal with other components Ignition switch ON Pulse generation (see WAVEFORM 13 )
(2) CANL (E7-34) - E1 (E4-3) W - BR Communication signal with other components Ignition switch ON Pulse generation (see WAVEFORM 14 )
AIRV (E4-24) - E1 (E4-3) R-W - BR Air switching valve for secondary air injection system Idling 9 to 14 V
AIRP (E4-11) - E1 (E4-3) Y-R - BR Air pump control Idling 9 to 14 V
AIDI (E5-20) - E1 (E4-3) G-R - BR Diagnostic information signal for air injection system Air injection system operates Pulse generation (see WAVEFORM 15 )
AIP (E5-22) - E2 (E4-28) GR - BR Secondary air injection system pressure signal Ignition switch ON 4.5 to 5.0 V
(1) The ECM terminal voltage is constant regardless of the output voltage from the sensor.
(2) Only for the vehicle equipped with VSC (see CAN BUS LINE ).
  1. WAVEFORM 1 

    Fuel injector

    WAVEFORM REFERENCE

    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: Identifying Waveform 1
    G05198056Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  2. WAVEFORM 2 
    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 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: Identifying Waveform 2
      G05198057Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  3. WAVEFORM 3 
    1. Camshaft position sensor
    2. Crankshaft position sensor
      WAVEFORM REFERENCE

      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: Identifying Waveform 3
      G05198058Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  4. WAVEFORM 4 

    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 5: Identifying Waveform 4
    G05198059Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  5. WAVEFORM 5 

    Throttle actuator negative terminal

    WAVEFORM REFERENCE

    ECM Terminal Names Between M- and MED1
    Tester Ranges 5V/DIV, 1msec./DIV
    Conditions Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 6: Identifying Waveform 5
    G05198060Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  6. WAVEFORM 6 

    Heated oxygen sensor

    WAVEFORM REFERENCE

    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 engine

    HINT:

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

    Fig 7: Identifying Waveform 6
    G05198061Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  7. WAVEFORM 7 

    Knock sensor

    WAVEFORM REFERENCE

    ECM Terminal Names Between KNK1 and EKNK
    Tester Ranges 0.01 to 10 V/DIV, 0.01 to 10 msec./DIV
    Conditions Engine speed maintained 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: Identifying Waveform 7
      G05198062Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  8. WAVEFORM 8 

    Camshaft timing oil control valve (OCV)

    WAVEFORM REFERENCE

    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: Identifying Waveform 8
    G05198063Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  9. WAVEFORM 9 

    EVAP VSV

    WAVEFORM REFERENCE

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

    Fig 10: Identifying Waveform 9
    G05198064Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  10. WAVEFORM 10 

    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 11: Identifying Waveform 10
    G05198065Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  11. WAVEFORM 11 

    Vehicle speed signal

    WAVEFORM REFERENCE

    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: Identifying Waveform 11
    G05198066Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  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
    G05198067Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  13. WAVEFORM 13 

    CAN communication signal (reference)

    WAVEFORM REFERENCE

    ECM Terminal Names Between CANH and E1
    Tester Ranges 1 V/DIV, 10 μs/DIV
    Conditions Ignition switch ON
    Fig 14: Identifying Waveform 13
    G05198068Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  14. WAVEFORM 14 

    CAN communication signal (reference)

    WAVEFORM REFERENCE

    ECM Terminal Names Between CANL and E1
    Tester Ranges 1 V/DIV, 10 μs/DIV
    Conditions Ignition switch ON
    Fig 15: Identifying Waveform 14
    G05198069Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
  15. WAVEFORM 15 

    Terminal Dl of air injection control driver

    WAVEFORM REFERENCE

    ECM Terminal Names Between AIDI and E1
    Tester Ranges 5 V/DIV, 100 ms/DIV
    Conditions Performing ACTIVE TEST using intelligent tester (air injection system)

    HINT:

    The wavelength changes when the air injection control driver detects malfunctions in the air injection system (see INSPECTION PROCEDURE  ).

    Fig 16: Identifying Waveform 15
    G05198070Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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