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Terminals Of ECM

Fig 1: ECM Connector Terminal Identification
GTY201334Courtesy 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 Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

Terminals No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
E8-3 (BATT) - E4-3 (E1) L - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
E8-7 (+BM) - E4-3 (E1) LG - BR Power source of throttle motor Always 11 to 14 V
E8-9 (IGSW) - E4-3 (E1) BE - BR Ignition switch Ignition switch ON 11 to 14 V
E8-1 (+B) - E4-3 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
E8-8 (MREL) - E4-3 (E1) G-W - BR EFI relay Ignition switch ON 11 to 14 V
E4-18 (VC) - E4-28 (E2) L - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.0 V
E4-20 (VTA1) - E4-28 (E2) G-B - BR Throttle position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released 0.5 to 1.1 V
E4-20 (VTA1) - E4-28 (E2) G-B - BR Throttle position sensor (for engine control) Ignition switch ON, Accelerator pedal fully depressed 3.2 to 4.8 V
E4-19 (VTA2) - E4-28 (E2) G-W - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released 2.1 to 3.1 V
E4-19 (VTA2) - E4-28 (E2) G-W - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully depressed 4.6 to 5.0 V
E8-18 (VPA) - E8-20 (EPA) R-Y - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released 0.5 to 1.1 V
E8-18 (VPA) - E8-20 (EPA) R-Y - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully depressed 2.6 to 4.5 V
E8-19 (VPA2) - E8-21 (EPA2) 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
E8-19 (VPA2) - E8-21 (EPA2) 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
E8-26 (VCPA) - E8-20 (EPA) R-W - LG-B Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.0 V
E8-27 (VCP2) - E8-21 (EPA2) L-W - R-B Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.0 V
E4-10 (ALT) - E4-3 (E1) L - BR Generator Ignition switch ON 11 to 14 V
E5-28 (VG) - E5-30 (E2G) R-Y - R-W Mass air flow meter Idling, shift position in P or N (for A/T) or neutral (for M/T), A/C switch off 0.5 to 3.0 V
E5-29 (THA) - E4-28 (E2) R-L - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
E4-32 (THW) - E4-28 (E2) Y-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
E5-6 (#10) - E4-7 (E01)
E5-5 (#20) - E4-7 (E01)
E5-2 (#30) - E4-7 (E01)
E5-1 (#40) - E4-7 (E01)		 R-L - W-B
B - W-B
R - W-B
G - W-B		 Injector Ignition switch ON 11 to 14 V
E5-6 (#10) - E4-7 (E01)
E5-5 (#20) - E4-7 (E01)
E5-2 (#30) - E4-7 (E01)
E5-1 (#40) - E4-7 (E01)		 R-L - W-B
B - W-B
R - W-B
G - W-B		 Injector Idling Pulse generation
(See Fig 2)
E4-17 (IGT1) - E4-3 (E1)
E4-16 (IGT2) - E4-3 (E1)
E4-15 (IGT3) - E4-3 (E1)
E4-14 (IGT4) - E4-3 (E1)		 P - BR
P-L - BR
LG - BR
LG-B - BR		 Ignition coil with igniter
(ignition signal)		 Idling Pulse generation
(See Fig 3)
E4-23 (IGF1) - E4-3 (E1) W-R - BR Ignition coil with igniter
(ignition confirmation signal)		 Ignition switch ON 4.5 to 5.0 V
E4-23 (IGF1) - E4-3 (E1) W-R - BR Ignition coil with igniter
(ignition confirmation signal)		 Idling Pulse generation
(See Fig 3)
E4-26 (G2) - E4-34 (NE-) L - G Camshaft position sensor Idling Pulse generation
(See Fig 4)
E4-27 (NE+) - E4-34 (NE-) R - G Crankshaft position sensor Idling Pulse generation
(See Fig 4)
E8-25 (FC) - E4-3 (E1) L-B - BR Fuel pump control Ignition switch ON 11 to 14 V
E8-25 (FC) - E4-3 (E1) L-B - BR Fuel pump control Idling Below 1.5 V
E4-5 (M+) - E5-3 (ME01) P - W-B Throttle actuator Idling with warm engine Pulse generation
(See Fig 5)
E4-4 (M-) - E5-3 (ME01) L - W-B Throttle actuator Idling with warm engine Pulse generation
(See Fig 6)
E4-21 (A1A+) - E4-3 (E1) P - BR Air fuel ratio sensor Always (Ignition switch ON) 3.3 V*1
E4-31 (A1A-) - E4-3 (E1) L - BR Air fuel ratio sensor Always (Ignition switch ON) 2.9 V*1
E4-25 (OX1B) - E4-28 (E2) W - BR Heated oxygen sensor Engine speed maintained 2500 RPM for 2 minutes after warming up sensor Pulse generation
(See Fig 7)
E4-1 (HA1A) - E5-7 (E04) R - W-B Air fuel ratio sensor heater Idling Pulse generation
(See Fig 8)
E4-1 (HA1A) - E5-7 (E04) R - W-B Air fuel ratio sensor heater Ignition switch ON 11 to 14 V
E4-2 (HT1B) - E5-4 (E03) G - W-B Heated oxygen sensor heater Idling Below 3.0 V
E4-2 (HT1B) - E5-4 (E03) G - W-B Heated oxygen sensor heater Ignition switch ON 11 to 14 V
E4-29 (KNK1) - E4-30 (EKNK) B - W Knock sensor Maintain engine speed 4000 RPM after warming up engine Pulse generation
(See Fig 9)
E4-13 (OC1+) - E4-12 (OC1-) L-W - W Camshaft timing oil control valve Idling Pulse generation
(See Fig 10)
E5-23 (PRG) - E4-7 (E01) Y - W-B Purge VSV Ignition switch ON 11 to 14 V
E5-23 (PRG) - E4-7 (E01) Y - W-B Purge VSV Idling Pulse generation
(See Fig 11)
E8-5 (VPMP) - E4-3 (E1) V-W - BR Vent valve
(built into canister pump module)		 Ignition switch ON 11 to 14 V
E8-6 (MPMP) - E4-3 (E1) G - BR Leak detection pump
(built into canister pump module)		 Leak detection pump OFF 0 to 3 V
E8-6 (MPMP) - E4-3 (E1) G - BR Leak detection pump
(built into canister pump module)		 Leak detection pump ON 11 to 14 V
E8-31 (PPMP) - E4-28 (E2) GR - BR Canister pressure sensor
(built into canister pump module)		 Ignition switch ON 3 to 3.6 V
E8-12 (STA) - E4-3 (E1) B-Y - BR Starter signal Shift position in N (for A/T), or neutral (M/T), ignition switch START 5.5 V or more
E7-4 (STP) - E4-3 (E1) L - BR Stop light switch Brake pedal depressed 7.5 to 14 V
E7-4 (STP) - E4-3 (E1) L - BR Stop light switch Brake pedal released Below 1.5 V
E8-16 (ST1-) - E4-3 (E1) V-W - BR Stop light switch Ignition switch ON, Brake pedal depressed Below 1.5 V
E8-16 (ST1-) - E4-3 (E1) V-W - BR Stop light switch Ignition switch ON, Brake pedal released 7.5 to 14 V
E7-30 (W) - E4-7 (E01) BR - W-B MIL Idling 11 to 14 V
E7-30 (W) - E4-7 (E01) BR - W-B MIL Ignition switch ON Below 3.5 V
E8-15 (ELS) - E4-3 (E1) G - BR Electric load Taillight switch ON 7.5 to 14 V
E8-15 (ELS) - E4-3 (E1) G - BR Electric load Taillight switch OFF 0 to 1.5 V
E7-20 (ELS2) - E4-3 (E1) B-W - BR Electric load Vehicle stationary, Voltage inverter outputs more than 100 W 11 to 14 V
E7-20 (ELS2) - E4-3 (E1) B-W - BR Electric load Vehicle stationary, Voltage inverter outputs 100 W or less 0 to 1.5 V
E7-1 (TACH) - E4-3 (E1) B-W - BR Engine speed Idling Pulse generation
(See Fig 12)
E7-8 (SPD) - E4-3 (E1) V-W - BR Speed signal from combination meter Driving at 12 mph (20 km/h) Pulse generation
(See Fig 13)
E7-17 (TC) - E4-3 (E1) G - BR Terminal TC of DLC 3 Ignition switch ON 11 to 14 V
E5-32 (PSW) - E4-3 (E1) G-W - BR Power steering oil pressure switch While turning steering wheel Below 1.5 V
E7-32 (F/PS) - E4-3 (E1) BE - BR Airbag sensor assembly Idling with warm engine Pulse generation
(See Fig 14)
E8-30 (NSW) - E4-3 (E1) V - BR Park/Neutral switch signal IG switch ON and shift position in P or N (for A/T), or neutral (M/T) Below 1 V
E8-30 (NSW) - E4-3 (E1) V - BR Park/Neutral switch signal IG switch ON and shift position except P or N (for A/T), or neutral (M/T) 11 to 14 V
E7-33 (CANH) - E4-3 (E1)*1 B - BR Communication signal with other components Ignition switch ON Pulse generation
(See Fig 15)
E7-34 (CANL) - E4-3 (E1)*1 W - BR Communication signal with other components Ignition switch ON Pulse generation
(See Fig 16)
E4-24 (AIRV) - E4-3 (E1) R-W - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
E4-11 (AIRP) - E4-3 (E1) Y-R - BR Air pump control Ignition switch ON 11 to 14 V
E5-20 (AIDI) - E4-3 (E1) G-R - BR Diagnostic information signal for air injection system Air injection system operates Pulse generation
(See Fig 17)
E5-22 (AIP) - E4-28 (E2) GR - BR Secondary air injection system pressure signal Ignition switch ON 4.5 to 5.0 V

*1: Only for the vehicle equipped with VSC. Refer to CAN Bus Line .

  1. WAVEFORM 1 
    Fig 2: Identifying Waveform 1
    GTY178138Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Fuel injector

    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.

  2. WAVEFORM 2 
    Fig 3: Identifying Waveform 2
    GTY190274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Igniter IGT signal (from ECM to igniter)
    2. Igniter IGF signal (from igniter to ECM)
      ECM Terminal Names (a) Between IGT (1 to 4) and E1
      (b) Between IGF1 and E1
      Tester Ranges 2 V/DIV, 20 msec./DIV
      Conditions Idling

      HINT: 

      The wavelength becomes shorter as the engine RPM increases.

  3. WAVEFORM 3 
    Fig 4: Identifying Waveform 3
    GTY186927Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Camshaft position sensor
    2. Crankshaft position sensor
      ECM Terminal Names (a) Between G2 and NE-
      (b) Between NE+ and NE-
      Tester Ranges 5 V/DIV, 20 msec./DIV
      Conditions Idling

      HINT: 

      The wavelength becomes shorter as the engine RPM increases.

  4. WAVEFORM 4 
    Fig 5: Identifying Waveform 4
    GTY191648Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Throttle actuator positive terminal

    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.

  5. WAVEFORM 5 
    Fig 6: Identifying Waveform 5
    GTY181056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Throttle actuator negative terminal

    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.

  6. WAVEFORM 6 
    Fig 7: Identifying Waveform 6
    GTY191628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Heated oxygen sensor

    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

    HINT: 

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

  7. WAVEFORM 7 
    Fig 8: Identifying Waveform 7
    GTY172588Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    AIR FUEL RATIO SENSOR HEATER

    ECM Terminal Names Between HA1A and E04
    Tester Ranges 5 V/DIV, 10 msec./DIV
    Conditions Idling with warm engine

    HINT: 

    The wavelength varies in accordance with the engine operating condition.

  8. WAVEFORM 8 
    Fig 9: Identifying Waveform 8
    GTY301576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Knock sensor

    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

    HINT: 

    • The wavelength becomes shorter as the engine RPM increases.
    • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
  9. WAVEFORM 9 
    Fig 10: Identifying Waveform 9
    GTY189313Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Camshaft timing oil control valve

    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.

  10. WAVEFORM 10 
    Fig 11: Identifying Waveform 10
    GTY191647Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Purge VSV

    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.

  11. WAVEFORM 11 
    Fig 12: Identifying Waveform 11
    GTY184254Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Engine speed signal

    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.

  12. WAVEFORM 12 
    Fig 13: Identifying Waveform 12
    GTY171162Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Vehicle speed signal

    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.

  13. WAVEFORM 13 
    Fig 14: Identifying Waveform 13
    GTY169230Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Airbag sensor assembly

    ECM Terminal Names Between F/PS and E1
    Tester Ranges 5 V/DIV, 500 msec./DIV
    Conditions Idling with warm engine
  14. WAVEFORM 14 
    Fig 15: Identifying Waveform 14
    GTY191597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    CAN communication signal (reference)

    ECM Terminal Names Between CANH and E1
    Tester Ranges 1 V/DIV, 10 μs/DIV
    Conditions Ignition switch ON
  15. WAVEFORM 15 
    Fig 16: Identifying Waveform 15
    GTY183878Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    CAN communication signal (reference)

    ECM Terminal Names Between CANL and E1
    Tester Ranges 1 V/DIV, 10 μs/DIV
    Conditions Ignition switch ON
  16. WAVEFORM 16 
    Fig 17: Identifying Waveform 16
    GTY171941Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Terminal DI of air injection control driver

    ECM Terminal Names Between AIDI and E1
    Tester Ranges 5 V/DIV, 100 ms/DIV
    Conditions Performing Active Test using Techstream (air injection system)

    HINT: 

    The wavelength changes when the air injection control driver detects malfunctions in the air injection system. Refer to INSPECTION PROCEDURE .

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