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Terminals Of ECM

Fig 1: Identifying Terminals Of ECM
G05676964Courtesy 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 Voltage column. The illustration above can be used as a reference to identify the ECM terminal locations.

ECM TERMINALS DESCRIPTIONS

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 on P or N (for A/T) or neutral (for M/T), 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 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 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 2)
G2 (E4-26) - NE- (E4-34) L-G Camshaft position sensor Idling Pulse generation (see waveform 3 3)
NE+ (E4-27) - NE- (E4-34) R-G Crankshaft position sensor Idling Pulse generation (see waveform 3 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 4)
M- (E4-4) - ME01 (E5-3) L - W-B Throttle actuator Idling with warm engine Pulse generation (see waveform 5 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 2500 rpm for 2 minutes after warming up sensor Pulse generation (see waveform 6 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 4000 rpm after warming up engine Pulse generation (see waveform 7 7)
OC1+ (E4-13) - OC1- (E4-12) L-W - W Camshaft timing oil control valve (OCV) Idling Pulse generation (see waveform 8 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 9)
VPMP (E8-5) - E1 (E4-3) V-W - BR Vent valve (built into canister pump module) Ignition switch ON 9 to 14 V
MPMP (E8-6) - E1 (E4-3) G - BR Leak detection pump (built into canister pump module) Leak detection pump OFF 0 to 3 V
MPMP (E8-6) - E1 (E4-3) G - BR Leak detection pump (built into canister pump module) Leak detection pump ON 9 to 14 V
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 on N (for A/T), or neutral (M/T), 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 Taillight switch ON 7.5 to 14 V
ELS (E8-15) - E1 (E4-3) G - BR Electric load Taillight 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 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 11)
TC (E7-17) - E1 (E4-3) P-B - BR Terminal TC of DLC 3 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 12)
NSW (E8-30) - E1 (E4-3) V - BR Park/Neutral switch signal IG switch ON and shift position on P or N (for A/T), or neutral (Ml T) Below 1 V
NSW (E8-30) - E1 (E4-3) V - BR Park/Neutral switch signal IG switch ON and shift position except P or N (for A/T), or neutral (M/T) 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 13)
(2) CANL (E7-34) - E1 (E4-3) W - BR Communication signal with other components Ignition switch ON Pulse generation (see waveform 14 14)
AIRV (E4-24) - E1 (E4-3) R-W - BR Air switching valve for secondary air injection system Ignition switch ON 9 to 14 V
AIRP (E4-11) - E1 (E4-3) Y-R - BR Air pump control Ignition switch ON 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 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

    WAVEFROM REFERENCE

    ECM Terminal Names Between #10 (to 40) and E01
    Tester Ranges 20 V/DIV, 20 msec./DIV
    Conditions Idling
    Fig 2: Waveform Graph 1
    G05676965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  2. WAVEFORM 2 
    1. Igniter IGT signal (from ECM to igniter)
    2. Igniter IGF signal (from igniter to ECM)
      WAVEFROM 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
      Fig 3: Waveform Graph 2
      G05676966Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

  3. WAVEFORM 3 
    1. Camshaft position sensor
    2. Crankshaft position sensor
      WAVEFROM REFERENCE

      ECM Terminal Names
      1. Between G2 and NE-
      2. Between NE+ and NE-
      Tester Ranges 5 V/DIV, 20 msec./DIV
      Conditions Idling
      Fig 4: Waveform Graph 3
      G05676967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

  4. WAVEFORM 4 

    Throttle actuator positive terminal

    WAVEFROM REFERENCE

    ECM Terminal Names Between M+ and ME01
    Tester Ranges 5 V/DIV, 1 msec./DIV
    Conditions Idling with warm engine
    Fig 5: Waveform Graph 4
    G05676968Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

  5. WAVEFORM 5 

    Throttle actuator negative terminal

    WAVEFROM REFERENCE

    ECM Terminal Names Between M- and ME01
    Tester Ranges 5 V/DIV, 1 msec./DIV
    Conditions Idling with warm engine
    Fig 6: Waveform Graph 5
    G05676969Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

  6. WAVEFORM 6 

    Heated oxygen sensor

    WAVEFROM REFERENCE

    ECM Terminal Names Between OX1B and E2
    Tester Ranges 0.2 V/DIV, 200 msec./DIV
    Conditions Engine speed maintained 2500 rpm for 2 minutes after warming up engine
    Fig 7: Waveform Graph 6
    G05676970Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

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

  7. WAVEFORM 7 

    Knock sensor

    WAVEFROM 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 4000 rpm after warming up engine
    Fig 8: Waveform Graph 7
    G05676971Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    • The wavelength becomes shorter as the engine rpm increases.
    • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
  8. WAVEFORM 8 

    Camshaft timing oil control valve (OCV)

    WAVEFROM REFERENCE

    ECM Terminal Names Between OC1+ and OC1-
    Tester Ranges 5 V/DIV, 1 msec./DIV
    Conditions Idling
    Fig 9: Waveform Graph 8
    G05676972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  9. WAVEFORM 9 

    Purge VSV

    WAVEFROM REFERENCE

    ECM Terminal Names Between PRG and E01
    Tester Ranges 5 V/DIV, 50 msec./DIV
    Conditions Idling
    Fig 10: Waveform Graph 9
    G05676973Courtesy 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.

  10. WAVEFORM 10 

    Engine speed signal

    WAVEFROM REFERENCE

    ECM Terminal Names Between TACH and E1
    Tester Ranges 5 V/DIV, 10 msec./DIV
    Conditions Idling
    Fig 11: Waveform Graph 10
    G05676974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  11. WAVEFORM 11 

    Vehicle speed signal

    WAVEFROM REFERENCE

    ECM Terminal Names Between SPD and E1
    Tester Ranges 5 V/DIV, 20 msec./DIV
    Conditions Driving at 12 mph (20 km/h)
    Fig 12: Waveform Graph 11
    G05676975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

  12. WAVEFORM 12 

    Airbag sensor assembly

    WAVEFROM REFERENCE

    ECM Terminal Names Between F/PS and E1
    Tester Ranges 5 V/DIV, 500 msec./DIV
    Conditions Idling with warm engine
    Fig 13: Waveform Graph 12
    G05676976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 

    CAN communication signal (reference)

    WAVEFROM REFERENCE

    ECM Terminal Names Between CANH and E1
    Tester Ranges 1 V/DIV, 10 μs/DIV
    Conditions Ignition switch ON
    Fig 14: Waveform Graph 13
    G05676977Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. WAVEFORM 14 

    CAN communication signal (reference)

    WAVEFROM REFERENCE

    ECM Terminal Names Between CANL and E1
    Tester Ranges 1 V/DIV, 10 μs/DIV
    Conditions Ignition switch ON
    Fig 15: Waveform Graph 14
    G05676978Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. WAVEFORM 15 

    Terminal DI of air injection control driver

    WAVEFROM REFERENCE

    ECM Terminal Names Between AIDI and E1
    Tester Ranges 5 V/DIV, 100 ms/DIV
    Conditions Performing Active Test using Techstream (air injection system)
    Fig 16: Waveform Graph 15
    G05676979Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

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

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