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Terminals Of ECM

WARNING: This page is about a different variant/trim than selected.
Fig 1: Identifying ECM Connector Terminals
G05183447Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The standard 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 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.

TERMINAL DESCRIPTION SPECIFIED CONDITION CHART

Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
A9-20 (BATT) - B30-104 (E1) W - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A9-3 (+BM) - B30-104 (E1) LG - BR Power source of throttle actuator Always 11 to 14 V
A9-28 (IGSW) - B30-104 (E1) B - BR Ignition switch Ignition switch ON 11 to 14 V
A9-2 (+B) - B30-104 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
A9-1 (+B2) - B30-104 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
B30-36 (OC1+) - B30-59 (OC1-) W-B Camshaft timing Oil Control Valve (OCV) for intake side Idling Pulse generation (see  1waveform 1)
A9-6 (MREL) - B30-104 (E1) P - BR EFI relay Ignition switch ON 11 to 14 V
B30-94 (VG) - B30-117 (E2G) R-LG Mass air flow meter Idling, shift lever in P or N, A/C switch off 0.5 to 3.0 V
B30-116 (THA) - B30-93 (ETHA) W - BR Intake air temperature sensor (built into mass air flow meter) Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
B30-64 (THW) - B30-65 (ETHW) GR - BR Engine coolant temperature sensor Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
B30-88 (VCTA) - B30-111 (ETA) Y - BR Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B30-90 (VTA1) - B30-111 (ETA) G - BR Throttle position sensor (for engine control) Ignition switch ON, throttle valve fully closed 0.5 to 1.1 V
Ignition switch ON, throttle valve fully open 3.2 to 4.8 V
B30-89 (VTA2) - B30-111 (ETA) L - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, throttle valve fully closed 2.1 to 3.1 V
Ignition switch ON, throttle valve fully open 4.5 to 5.5 V
A9-55 (VPA) - A9-59 (EPA) W-Y Accelerator pedal position sensor (for engine control) Ignition switch ON, accelerator pedal released 0.5 to 1.1 V
Ignition switch ON, accelerator pedal fully depressed 2.5 to 4.5 V
A9-56 (VPA2) - A9-60 (EPA2) R-P Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, accelerator pedal released 1.2 to 2.0 V
Ignition switch ON, accelerator pedal fully depressed 3.4 to 5.5 V
A9-57 (VCPA) - A9-59 (EPA) B-Y Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A9-58 (VCP2) - A9-60 (EPA2) L-P Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
B30-18 (HA1A) - B30-46 (E04) L-W-B Air fuel ratio sensor heater Idling with warm engine Pulse generation (see  2waveform 2)
Ignition switch ON 11 to 14 V
B30-103 (A1A+) - B30-104 (E1) G - BR Air fuel ratio sensor Ignition switch ON 3.3 V*
B30-126 (A1A-) - B30-104 (E1) R - BR Air fuel ratio sensor Ignition switch ON 3.0 V*
B30-41 (HT1B) - B30-86 (E03) R-W-B Heated oxygen sensor heater Ignition switch ON 11 to 14 V
B30-125 (OX1B) - B30-102 (O1B-) W-B Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor Pulse generation (see  3waveform 3)
B30-85 (#10) - B30-109 (E01) L - W-B Fuel injector Ignition switch ON 11 to 14 V
B30-84 (#20) - B30-109 (E01) G - W-B Idling Pulse generation (see  4waveform 4)
B30-83 (#30) - B30-109 (E01) B - W-B
B30-82 (#40) - B30-109 (E01) W - W-B
B30-87 (KNK1) - B30-110 (EKNK) B - W Knock sensor Engine speed maintained at 4000 rpm after warming up engine Pulse generation (see  5waveform 5)
B30-76 (G2+) - B30-122 (G2-) B - R Camshaft position sensor for intake side Idling Pulse generation (see  6waveform 6)
B30-74 (NE+) - B30-120 (NE-) W-B Crankshaft position sensor Idling Pulse generation (see  6waveform 6)
B30-108 (IGT1) - B30-104 (E1) R - BR Ignition coil (ignition signal) Idling Pulse generation (see  7waveform 7)
B30-107 (IGT2) - B30-104 (E1) P - BR
B30-106 (IGT3) - B30-104 (E1) G - BR
B30-105 (IGT4) - B30-104 (E1) L - BR
B30-23 (IGF1) - B30-104 (E1) W - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
Idling Pulse generation (see  7waveform 7)
B30-28 (PRG) - B30-104 (E1) G - BR Purge VSV Ignition switch ON 11 to 14 V
Idling Pulse generation (see  8waveform 8)
A9-15 (SPD) - B30-104 (E1) V - BR Speed signal from combination meter Vehicle driven at 20 km/h (12 mph) Pulse generation (see  9waveform 9)
A9-48 (STA) - B30-104 (E1) LG - BR Starter signal Cranking 5.5 V or higher
B30-47 (NSW) - B30-104 (E1) W - BR Park/neutral position switch signal Ignition switch ON, transmission gear position in P or N Below 1.5 V
Ignition switch ON, transmission gear position not in P or N 6.0 V or higher
A9-29 (STP) - B30-104 (E1) L - BR Stop light switch Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A9-39 (ST1-) - B30-104 (E1) GR - BR Stop light switch (opposite to voltage at STP terminal) Ignition switch ON, brake pedal depressed Below 1.5 V
Ignition switch ON, brake pedal released 7.5 to 14 V
B30-21 (M+) - B30-19 (ME01) B - W-B Throttle actuator Idling with warm engine Pulse generation (see  10waveform 10)
B30-20 (M-) - B30-19 (ME01) W - W-B Throttle actuator Idling with warm engine Pulse generation (see  11waveform 11)
A9-8 (FC) - B30-104 (E1) W - BR Fuel pump control Ignition switch ON 11 to 14 V
Idling Below 1.5 V
A9-36 (W) - B30-104 (E1) R - BR MIL Ignition switch ON (MIL turns on) Below 1.5 V
Idling 11 to 14 V
A9-7 (TC) - B30-104 (E1) G - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A9-26 (TACH) - B30-104 (E1) GR - BR Engine speed Idling Pulse generation (see  12waveform 12)
A9-42 (VPMP) - B30-104 (E1) W - BR Vent valve (built into canister pump module) Ignition switch ON 11 to 14 V
A9-34 (MPMP) - B30-104 (E1) B - BR Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3 V
Leak detection pump ON 11 to 14 V
B30-113 (VCPP) - B30-112 (EPPM) Y - BR Power source for canister pressure sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B30-114 (PPMP) - B30-112 (EPPM) V - BR Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
A9-31 (ELS1) - B30-104 (E1) P - BR Electric load Taillight switch on 7.5 to 14 V
Taillight switch off Below 1.5 V
A9-41 (ELS3) - B30-104 (E1) G - BR Electric load Defogger switch on 7.5 to 14 V
Defogger switch off Below 1.5 V
A9-21 (FANL) - B30-104 (E1) R - BR No. 3 fan relay Ignition switch ON 11 to 14 V
Idling with A/C ON, or high engine coolant temperature Below 1.5 V
A9-22 (FANH) - B30-104 (E1) W - BR No. 1 and No. 2 fan relay Idling with high engine coolant temperature Below 1.5 V
B30-39 (ALT) - B30-104 (E1) B - BR Generator Ignition switch ON 11 to 14 V
A9-13 (CANH) - B30-104 (E1) Y - BR CAN communication line Ignition switch ON Pulse generation (see  13waveform 13)
A9-5 (CANL) - B30-104 (E1) W - BR CAN communication line Ignition switch ON Pulse generation (see  14waveform 14)
B30-27 (ACIS) - B30-104 (E1) R - BR Intake air control valve actuator Ignition switch ON 11 to 14 V
B30-35 (OE1+) - B30-58 (OE1-) R-LG Camshaft timing Oil Control Valve (OCV) for exhaust side Idling Pulse generation (see  1waveform 1)
B30-99 (VCV1) - B30-104 (E1) W - BR Power source of camshaft position sensor for intake side (specific voltage) Ignition switch ON 4.5 to 5.5 V
B30-98 (VCE1) - B30-104 (E1) W - BR Power source of camshaft position sensor for exhaust side (specific voltage) Ignition switch ON 4.5 to 5.5 V
B30-75 (EV1+) - B30-121 (EV1-) B-R Camshaft position sensor for exhaust side Idling Pulse generation (see  6waveform 6)
B30-4 (IA1+) - B30-109 (E01) W - W-B DC motor for TCV Idling with cold engine Pulse generation (see  15waveform 15)
B30-3 (IA1-) - B30-109 (E01) B - W-B DC motor for TCV Idling with cold engine Pulse generation (see  16waveform 16)
B30-70 (IAC1) - B30-71 (EIA1) GR - BR TCV position sensor Ignition switch off to ON 3.0 to 4.0 V
B30-72 (VCIA) - B30-104 (E1) V - BR Power source of TCV position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
A9-52 (STSW) - B30-104 (E1) R - BR Starter switch Shift lever in P or N, cranking 6.0 V or higher
B30-2 (ACCR) - B30-104 (E1) LG - BR ACC relay control signal Ignition switch ON → Cranking 11 to 14 V → Below 1 V
B30-17 (STAR) - B30-104 (E1) W - BR Starter relay control Ignition switch ON Below 1.5 V
B30-17 (STAR) - B30-104 (E1) W - BR Starter relay control Cranking 5.5 V or higher
HINT:
*: 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

    Terminal No. (Symbol) Tool Setting Condition
    B30-36 (OC1+) - B30-59 (OC1-) 5 V/DIV, 1 ms/DIV Idling
    B30-35 (OE1+) - B30-58 (OE1-) 5 V/DIV, 1 ms/DIV Idling
    Fig 2: Identifying Waveform 1
    G05996764Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 

    Air Fuel Ratio Sensor (Sensor 1) Heater 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-18 (HA1A) - B30-46 (E04) 5 V/DIV, 10 ms/DIV Idling with warm engine

    HINT:

    The wavelength varies in accordance with the engine operating condition.

    Fig 3: Identifying Waveform 2
    G05996765Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. WAVEFORM 3 

    Heated Oxygen Sensor (Sensor 2) 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-125 (OX1B) - B30-102 (O1B-) 0.2 V/DIV, 200 ms/DIV Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

    HINT:

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

    Fig 4: Identifying Waveform 3
    G05996766Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. WAVEFORM 4 

    Injector No. 1 (to No. 4) Injection Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-85 (#10) - B30-109 (E01) 20 V/DIV, 20 ms/DIV Idling
    B30-84 (#20) - B30-109 (E01) 20 V/DIV, 20 ms/DIV Idling
    B30-83 (#30) - B30-109 (E01) 20 V/DIV, 20 ms/DIV Idling
    B30-82 (#40) - B30-109 (E01) 20 V/DIV, 20 ms/DIV Idling
    Fig 5: Identifying Waveform 4
    G05996767Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine speed increases.

  5. WAVEFORM 5 

    Knock Sensor 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-87 (KNK1) - B30-110 (EKNK) 1 V/DIV, 1 ms/DIV Engine speed maintained at 4000 rpm after warming up engine

    HINT:

    • The wavelength becomes shorter as the engine speed increases.
    • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
      Fig 6: Identifying Waveform 5
      G05996768Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. WAVEFORM 6 

    Crankshaft Position Sensor and Camshaft Position Sensor 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-74 (NE+) - B30-120 (NE-) 5 V/DIV, 20 ms/DIV Idling
    B30-76 (G2+) - B30-122 (G2-) 5 V/DIV, 20 ms/DIV Idling
    B30-75 (EV1+) - B30-121 (EV1-) 5 V/DIV, 20 ms/DIV Idling
    Fig 7: Identifying Waveform 6
    G05996769Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine speed increases.

  7. WAVEFORM 7 

    Igniter IGT Signal (from ECM to Igniter) and Igniter IGF Signal (from Igniter to ECM) 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-108 (IGT1) - B30-104 (E1) 2 V/DIV, 20 ms/DIV Idling
    B30-107 (IGT2) - B30-104 (E1) 2 V/DIV, 20 ms/DIV Idling
    B30-106 (IGT3) - B30-104 (E1) 2 V/DIV, 20 ms/DIV Idling
    B30-105 (IGT4) - B30-104 (E1) 2 V/DIV, 20 ms/DIV Idling
    B30-23 (IGF1) - B30-104 (E1) 2 V/DIV, 20 ms/DIV Idling
    Fig 8: Identifying Waveform 7
    G05996770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8 

    Purge VSV 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-28 (PRG) - B30-104 (E1) 10 V/DIV, 20 ms/DIV Idling

    HINT:

    If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

    Fig 9: Identifying Waveform 8
    G05996771Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. WAVEFORM 9 

    Vehicle Speed Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    A9-15 (SPD) - B30-104 (E1) 2 V/DIV, 20 ms/DIV Vehicle driven at 20 km/h (12 mph)

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

    Fig 10: Identifying Waveform 9
    G05996772Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. WAVEFORM 10 

    Throttle Actuator Positive Terminal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-21 (M+) - B30-19 (ME01) 5 V/DIV, 1 ms/DIV Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Identifying Waveform 10
    G05996773Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. WAVEFORM 11 

    Throttle Actuator Negative Terminal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-20 (M-) - B30-19 (ME01) 5 V/DIV, 1 ms/DIV Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 12: Identifying Waveform 11
    G05996774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. WAVEFORM 12 

    Engine Speed Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    A9-26 (TACH) - B30-104 (E1) 5 V/DIV, 10 ms/DIV Idling

    HINT:

    The wavelength becomes shorter as the engine speed increases.

    Fig 13: Identifying Waveform 12
    G05996775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 

    CAN Communication Signal (Reference) 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    A9-13 (CANH) - B30-104 (E1) 1 V/DIV, 10 (is/DIV Engine stopped and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 14: Identifying Waveform 13
    G05996776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. WAVEFORM 14 

    CAN Communication Signal (Reference) 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    A9-5 (CANL) - B30-104 (E1) 1 V/DIV, 10 μS/DIV Engine stopped and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 15: Identifying Waveform 14
    G05996777Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. WAVEFORM 15 

    DC Motor for TCV Positive Terminal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-4 (IA1+) - B30-109 (E01) 5 V/DIV, 1 ms/DIV Idling with cold engine
    Fig 16: Identifying Waveform 15
    G05996778Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. WAVEFORM 16 

    DC Motor for TCV Negative Terminal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B30-3 (IA1-) - B30-109 (E01) 5 V/DIV, 1 ms/DIV Idling with cold engine
    Fig 17: Identifying Waveform 16
    G05996779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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