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Terminals Of ECM

Fig 1: Identifying ECM Connector Terminals
G06022988Courtesy 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
A49-20 (BATT) - B58-104 (E1) V - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A49-3 (+BM) - B58-104 (E1) BR - BR Power source of throttle actuator Always 11 to 14 V
A49-28 (IGSW) - B58-104 (E1) SB - BR Ignition switch Ignition switch ON 11 to 14 V
A49-2 (+B) - B58-104 (E1) R - BR Power source of ECM Ignition switch ON 11 to 14 V
A49-1 (+B2) - B58-104 (E1) GR - BR Power source of ECM Ignition switch ON 11 to 14 V
B58-36 (OC1+) - B58-59 (OC1-) L-R - G-B Camshaft timing oil control valve for intake side Idling Pulse generation (see waveform 1 1)
A49-6 (MREL) - B58-104 (E1) P - BR EFI MAIN relay Ignition switch ON 11 to 14 V
B58-94 (VG) - B58-117 (E2G) R - L-W Mass air flow meter Idling, shift lever in P or N, A/C switch off 0.5 to 3.0 V
B58-116 (THA) - B58-93 (ETHA) L-B - W-B Intake air temperature sensor (built into mass air flow meter) Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V
B58-64 (THW) - B58-65 (ETHW) G - B-B Engine coolant temperature sensor Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
B58-88 (VCTA) - B58-111 (ETA) Y-B - W-B Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B58-90 (VTA1) - B58-111 (ETA) R-W - W-B Throttle position sensor (for engine control) Ignition switch ON, accelerator pedal released 0.5 to 1.1 V
Ignition switch ON, accelerator pedal fully depressed 3.2 to 4.8 V
B58-89 (VTA2) - B58-111 (ETA) B-R - W-B Throttle position sensor (for sensor malfunction detection) Ignition switch ON, accelerator pedal released 2.1 to 3.1 V
Ignition switch ON, accelerator pedal fully depressed 4.6 to 5.0 V
A49-55 (VPA) - A49-59 (EPA) L-GR Accelerator pedal position sensor (for engine control) Ignition switch ON, accelerator pedal released 0.5 to 1.1V
Ignition switch ON, accelerator pedal fully depressed 2.6 to 4.5 V
A49-56 (VPA2) - A49-60 (EPA2) BE - LG 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
A49-57 (VCPA) - A49-59 (EPA) G - GR Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A49-58 (VCP2) - A49-60 (EPA2) Y - LG Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
B58-18 (HA1A) - B58-46 (E04) BR - W-B Air fuel ratio sensor heater Idling with warm engine Pulse generation (see waveform 2 2)
Ignition switch ON 11 to 14 V
B58-103 (A1A+) - B58-104 (E1) P - BR Air fuel ratio sensor Ignition switch ON 3.3 V(1)
B58-126 (A1A-) - B58-104 (E1) L - BR Air fuel ratio sensor Ignition switch ON 3.0 V(1)
B58-41 (HT1B) - B58-86 (E03) Y-B Heated oxygen sensor heater Ignition switch ON 11 to 14 V
B58-125 (OX1B) - B58-102 (O1B-) G-R Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up engine Pulse generation (see waveform 3 3)
B58-85 (#10) - B58-109 (E01) G-W Fuel injector Ignition switch ON 11 to 14 V
B58-84 (#20) - B58-109 (E01) Y-W Idling Pulse generation (see waveform 4 4)
B58-83 (#30) - B58-109 (E01) R-W
B58-82 (#40) - B58-109 (E01) L-R-W
B58-87 (KNK1) - B58-110 (EKNK) R-G Knock sensor Engine speed maintained at 4000 rpm after warming up engine Pulse generation (see waveform 5 5)
B58-76 (G2+) - B58-122 (G2-) P-V Camshaft position sensor for intake side Idling Pulse generation (see waveform 6 6)
B58-74 (NE+) - B58-120 (NE-) R-G Crankshaft position sensor Idling Pulse generation (see waveform 6 6)
A49-53 (NEO)(2) - B58-104 (E1) GR - BR Crankshaft position sensor Idling with warm engine Pulse generation (see waveform 17 17)
B58-108 (IGT1) - B58-104 (E1) R-L - BR Ignition coil (ignition signal) Idling Pulse generation (see waveform 7 7)
B58-107 (IGT2) - B58-104 (E1) P - BR
B58-106 (IGT3) - B58-104 (E1) Y-B - BR
B58-105 (IGT4) - B58-104 (E1) L-Y - BR
B58-23 (IGF1) - B58-104 (E1) W-R - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
Idling Pulse generation (see waveform 7 7)
B58-28 (PRG) - B58-104 (E1) G - BR Purge VSV Ignition switch ON 11 to 14 V
Idling Pulse generation (see waveform 8 8)
A49-15 (SPD) - B58-104 (E1) BR - BR Speed signal from combination meter Vehicle driven at 12 mph (20 km/h) Pulse generation (see waveform 9 9)
A49-48 (STA) - B58-104 (E1) BR - BR Starter signal Cranking 5.5 V or higher
B58-47 (NSW) - B58-104 (E1) G - BR Park/neutral position switch signal Ignition switch ON, shift lever in P or N Below 1.5 V
Ignition switch ON, shift lever not in P or N 6.0 V or higher
A49-29 (STP) - B58-104 (E1) G - BR Stop light switch assembly Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A49-39 (ST1-) - B58-104 (E1) V - BR Stop light switch assembly (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
B58-21 (M+) - B58-19 (ME01) Y-B Throttle actuator Idling with warm engine Pulse generation (see waveform 10 10)
B58-20 (M-) - B58-19 (ME01) L-B Throttle actuator Idling with warm engine Pulse generation (see waveform 11 11)
A49-8 (FC) - B58-104 (E1) LG - BR Fuel pump control Ignition switch ON 11 to 14 V
Idling Below 1.5 V
A49-36 (W) - B58-104 (E1) R - BR MIL Ignition switch ON (MIL turns on) Below 1.5 V
Idling 11 to 14 V
A49-7 (TC) - B58-104 (E1) V - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A49-26 (TACH) - B58-104 (E1) Y - BR Engine speed Idling Pulse generation (see waveform 12 12)
A49-42 (VPMP) - B58-104 (E1) BE - BR Vent valve (built into canister pump module) Ignition switch ON 11 to 14 V
A49-34 (MPMP) - B58-104 (E1) V - BR Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3 V
Leak detection pump ON 11 to 14 V
B58-113 (VCPP) - B58-112 (EPPM) LG-W Power source for canister pressure sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B58-114 (PPMP) - B58-112 (EPPM) Y-W Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
A49-21 (FANL) - B58-104 (E1) L - BR FAN NO. 3 relay Ignition switch ON Below 1.5 V
Idling with A/C ON, or high engine coolant temperature
A49-22 (FANH) - B58-104 (E1) P - BR FAN NO. 1 and FAN NO. 2 relay Idling with high engine coolant temperature Below 1.5 V
B58-39 (ALT) - B58-104 (E1) L - BR Generator Ignition switch ON 11 to 14 V
A49-13 (CANH) - B58-104 (E1) Y - BR CAN communication line Ignition switch ON Pulse generation (see waveform 13 13)
A49-5 (CANL) - B58-104 (E1) W - BR CAN communication line Ignition switch ON Pulse generation (see waveform 14 14)
B58-27 (ACIS) - B58-104 (E1) R-Y - BR VSV for Acoustic Control Induction System (ACIS) operation signal Ignition switch ON 11 to 14 V
B58-35 (OE1+) - B58-58 (OE1-) G-GR Camshaft timing oil control valve for exhaust side Idling Pulse generation (see waveform 1 1)
B58-99 (VCV1) - B58-104 (E1) LG - BR Power source of camshaft position sensor for intake side (specific voltage) Ignition switch ON 4.5 to 5.5 V
B58-98 (VCE1) - B58-104 (E1) BR - BR Power source of camshaft position sensor for exhaust side (specific voltage) Ignition switch ON 4.5 to 5.5 V
B58-75 (EV1+) - B58-121 (EV1-) Y - BR Camshaft position sensor for exhaust side Idling Pulse generation (see waveform 6 6)
B58-4 (IA1+) - B58-109 (E01) BR - BR DC motor for tumble control valve Idling with cold engine Pulse generation (see waveform 15 15)
B58-3 (IA1-) - B58-109 (E01) LG - BR DC motor for tumble control valve Idling with cold engine Pulse generation (see waveform 16 16)
B58-70 (IAC1) - B58-71 (EIA1) R-W - B-R Tumble control valve position sensor Ignition switch ON 3.0 to 4.0 V
B58-72 (VCIA) - B58-104 (E1) W-L - BR Power source of tumble control valve position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B58-24 (CAN+) - B58-104 (E1) R - BR CAN communication line Ignition switch ON Pulse generation (see waveform 13 13)
B58-1 (CAN-) - B58-104 (E1) W - BR CAN communication line Ignition switch ON Pulse generation (see waveform 14 14)
A49-12 (CANP)(2) - B58-104 (E1) G - BR CAN communication line Ignition switch ON Pulse generation (see waveform 13 13)
A49-4 (CANN)(2) - B58-104 (E1) W - BR CAN communication line Ignition switch ON Pulse generation (see waveform 14 14)
A49-16 (SFTU) - B58-104 (E1) R - BR Up shift switch signal Ignition switch ON and shift lever in S 11 to 14 V
Ignition switch ON and shift lever in S, the "+" range (up shift) selected 0 to 1.5 V
A49-51 (SFTD) - B58-104 (E1) LG - BR Down shift switch signal Ignition switch ON and shift lever in S 11 to 14 V
Ignition switch ON and shift lever in S, the "-" range (down shift) selected 0 to 1.5 V
B58-32 (P) - B58-104 (E1) Y - BR P shift position switch signal Ignition switch ON and shift lever in P 11 to 14 V
Ignition switch ON and shift lever in any position other than P 0 to 1.5 V
B58-33 (R) - B58-104 (E1) V - BR R shift position switch signal Ignition switch ON and shift lever in R 11 to 14 V
Ignition switch ON and shift lever in any position other than R 0 to 1.5 V
B58-34 (N) - B58-104 (E1) L-B - BR N shift position switch signal Ignition switch ON and shift lever in N 11 to 14 V
Ignition switch ON and shift lever in any position other than N 0 to 1.5 V
B58-30 (D) - B58-104 (E1) BR - BR D shift position switch signal Ignition switch ON and shift lever in D 11 to 14 V
Ignition switch ON and shift lever in any position other than D 0 to 1.5 V
A49-14 (S) - B58-104 (E1) BE - BR S shift position switch signal Ignition switch ON and shift lever in S 11 to 14 V
Ignition switch ON and shift lever in any position other than S 0 to 1.5 V
A49-50 (ELS2) - Body ground BR- - Idle up signal Ignition switch ON, and appliance using 50 W or more 4.0 V or more
(1) The ECM terminal voltage is constant regardless of the output voltage shown on the Techstream.
(2) w/ Smart Key System
  1. WAVEFORM 1 

    Camshaft Timing Oil Control Valve Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-36 (OC1+) - B58-59 (OC1-) 5 V/DIV, 1 ms/DIV Idling
    B58-35 (OE1+) - B58-58 (OE1-) 5 V/DIV, 1 ms/DIV Idling
    Fig 2: Identifying Waveform 1
    G06022989Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 

    Air Fuel Ratio Sensor (Bank 1 Sensor 1) Heater Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-18 (HA1A) - B58-46 (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 (Bank 1 Sensor 2) Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-125 (OX1B) - B58-102 (O1B-) 0.2 V/DIV, 200 ms/DIV Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    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
    B58-85 (#10) - B58-109 (E01) 20 V/DIV, 20 ms/DIV Idling
    B58-84 (#20) - B58-109 (E01) 20 V/DIV, 20 ms/DIV Idling
    B58-83 (#30) - B58-109 (E01) 20 V/DIV, 20 ms/DIV Idling
    B58-82 (#40) - B58-109 (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 Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-87 (KNK1) - B58-110 (EKNK) 1 V/DIV, 1 ms/DIV Engine speed maintained at 4000 rpm after warming up engine
    Fig 6: Identifying Waveform 5
    G06022993Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    • The wavelength becomes shorter as the engine speed increases.
    • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
  6. WAVEFORM 6 

    Crankshaft Position Sensor and Camshaft Position Sensor Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-74 (NE+) - B58-120 (NE-) 5 V/DIV, 20 ms/DIV Idling
    B58-76 (G2+) - B58-122 (G2-) 5 V/DIV, 20 ms/DIV Idling
    B58-75 (EV1+) - B58-121 (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 

    Ignition Coil IGT Signal (from ECM to Ignition Coil) and Ignition Coil IGF Signal (from Ignition Coil to ECM) 

    Fig 8: Identifying Waveform 7
    G06022995Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-108 (IGT1) - B58-104 (E1) 2 V/DIV, 20 ms/DIV Idling
    B58-107 (IGT2) - B58-104 (E1) 2 V/DIV, 20 ms/DIV Idling
    B58-106 (IGT3) - B58-104 (E1) 2 V/DIV, 20 ms/DIV Idling
    B58-105 (IGT4) - B58-104 (E1) 2 V/DIV, 20 ms/DIV Idling
    B58-23 (IGF1) - B58-104 (E1) 2 V/DIV, 20 ms/DIV Idling

    HINT:

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8 

    Purge VSV Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-28 (PRG) - B58-104 (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
    A49-15 (SPD) - B58-104 (E1) 2 V/DIV, 20 ms/DIV Vehicle driven at 12 mph (20 km/h)

    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 Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-21 (M+) - B58-19 (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 Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-20 (M-) - B58-19 (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
    A49-26 (TACH) - B58-104 (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
    A49-13 (CANH) - B58-104 (E1) 1 V/DIV, 10 μs/DIV Ignition switch ON
    B58-24 (CAN+) - B58-104 (E1) 1 V/DIV, 10 μs/DIV Ignition switch ON
    A49-12 (CANP) - B58-104 (E1) 1 V/DIV, 10 μs/DIV Ignition switch ON
    Fig 14: Identifying Waveform 13
    G06023001Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The waveform varies depending on the CAN communication signal.

  14. WAVEFORM 14 

    CAN Communication Signal (Reference) 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    A49-5 (CANL) - B58-104 (E1) 1 V/DIV, 10 μs/DIV Ignition switch ON
    B58-1 (CAN-) - B58-104 (E1) 1 V/DIV, 10 μs/DIV Ignition switch ON
    A49-4 (CANN) - B58-104 (E1) 1 V/DIV, 10 μs/DIV Ignition switch ON
    Fig 15: Identifying Waveform 14
    G06023002Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The waveform varies depending on the CAN communication signal.

  15. WAVEFORM 15 

    DC Motor for Tumble Control Valve Positive Terminal Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-4 (IA1+) - B58-109 (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 Tumble Control Valve Negative 

    Terminal Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    B58-3 (IA1-) - B58-109 (E01) 5 V/DIV, 1 ms/DIV Idling with cold engine
    Fig 17: Identifying Waveform 16
    G05996779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  17. WAVEFORM 17 

    Crankshaft Position Sensor Signal 

    WAVEFORM REFERENCE

    Terminal No. (Symbol) Tool Setting Condition
    A49-53 (NEO) - B58-104 (E1) 5 V/DIV, 2 ms/DIV Idling with warm engine
    18. Fig 18: Identifying Waveform 17
    G06023005Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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