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Terminals Of ECM

Fig 1: Identifying ECM Connector Terminals
G06227295Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage according to the value(s) in the table below.

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.

TERMINAL DESCRIPTIONS CHART

Terminal No. (Symbols) Wiring Colors Terminal Descriptions Conditions Specified Condition
A24-1 (BATT) - D74-81 (E1) L - BR Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
D74-41 (+BM) - D74-81 (E1) P - BR Power source of throttle motor Always 11 to 14 V
A24-28 (IGSW) - D74-81 (E1) LG - BR Ignition switch Ignition switch ON 11 to 14 V
A24-3 (+B) - D74-81 (E1) GR - BR Power source of ECM Ignition switch ON 11 to 14 V
A24-2 (+B2) - D74-81 (E1) GR - BR Power source of ECM Ignition switch ON 11 to 14 V
D74-58 (OC1+) - D74-57 (OC1-) L-B - R-B Camshaft timing oil control valve (OCV for bank 1) Ignition switch ON Pulse generation (See  1 waveform 1)
D74-52 (OC2+) - D74-51 (OC2-) B - B-L Camshaft timing oil control valve (OCV for bank 2) Ignition switch ON Pulse generation (See  1 waveform 1)
A24-34 (MREL) - D74-81 (E1) W - BR EFI relay Ignition switch ON 11 to 14 V
D74-67 (VCV1) - D74-97 (ETHW) L - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
D74-66 (VCV2) - D74-98 (ETHA) L - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
D74-74 (VG) - D74-75 (E2G) L-Y - G-W Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
D74-73 (THA) - D74-98 (ETHA) Y-B - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
D74-76 (THW) - D74-97 (ETHW) G-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
D74-80 (VCTA) - D74-79 (ETA) L - B Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
D74-78 (VTA1) - D74-79 (ETA) R-Y - B Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.2 V
Ignition switch ON, Throttle valve fully open 3.2 to 4.8 V
D74-77 (VTA2) - D74-79 (ETA) Y-B - B 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 5.0 V
A24-55 (VPA) - A24-58 (EPA) W - BE Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal fully released 0.5 to 1.1 V
Ignition switch ON, Accelerator pedal fully depressed 2.6 to 4.5 V
A24-56 (VPA2) - A24-60 (EPA2) LG - BR Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal fully released 1.2 to 2.0 V
Ignition switch ON, Accelerator pedal fully depressed 3.4 to 5.0 V
A24-57 (VCPA) - A24-58 (EPA) B - BE Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A24-59 (VCP2) - A24-60 (EPA2) V - BR Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
D74-22 (HA1A) - D74-23 (E04)
D74-20 (HA2A) - D74-21 (E05)		 L - W-B
G - W-B		 A/F sensor heater Idling Below 3.0 V
Ignition switch ON 11 to 14 V
D74-126 (A1A+) - D74-81 (E1) G - BR A/F sensor Ignition switch ON 3.3 V(1)
D74-103 (A2A+) - D74-81 (E1) V - BR A/F sensor Ignition switch ON 3.3 V(1)
D74-125 (A1A-) - D74-81 (E1) R - BR A/F sensor Ignition switch ON 2.9 V(1)
D74-102 (A2A-) - D74-81 (E1) P - BR A/F sensor Ignition switch ON 2.9 V(1)
D74-45 (HT1B) - D74-81 (E1)
D74-44 (HT2B) - D74-81 (E1)		 G - BR
B - BR		 Heated oxygen sensor heater Idling Below 3.0 V
Ignition switch ON 11 to 14 V
D74-114 (OX1B) - D74-115 (EX1B)
D74-112 (OX2B) - D74-113 (EX2B)		 W - BR
B - BR		 Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up engine Pulse generation (See  2 waveform 2)
D74-86 (#10) - D74-43 (E01) R-L - W-B Injector Ignition switch ON 11 to 14 V
D74-109 (#20) - D74-43 (E01) L - W-B Idling Pulse generation (See  3 waveform 3)
D74-85 (#30) - D74-43 (E01) R - W-B
D74-108 (#40) - D74-43 (E01) Y - W-B
D74-84 (#50) - D74-43 (E01) G - W-B
D74-107 (#60) - D74-43 (E01) R - W-B
D74-94 (KNK1) - D74-93 (EKNK) G-R Knock sensor (bank 1) Engine speed maintained at 4000 rpm after warming up Pulse generation (See  4 waveform 4)
D74-117 (KNK2) - D74-116 (EKN2) W-B Knock sensor (bank 2) Engine speed maintained at 4000 rpm after warming up Pulse generation (See  4 waveform 4)
D74-90 (VV1+) - D74-89 (VV1-) R - L-R Variable valve timing (VVT) sensor (bank 1) Idling Pulse generation (See  5 waveform 5)
D74-87 (VV2+) - D74-88 (VV2-) R - G Variable valve timing (VVT) sensor (bank 2) Idling Pulse generation (See  5 waveform 5)
D74-110 (NE+) - D74-111 (NE-) B - W Crankshaft position sensor Idling Pulse generation (See  5 waveform 5)
D74-40 (IGT1) - D74-81 (E1) B-R - BR Ignition coil (ignition signal) Idling Pulse generation (See  6 waveform 6)
D74-39 (IGT2) - D74-81 (E1) L-Y - BR
D74-38 (IGT3) - D74-81 (E1) B - BR
D74-37 (IGT4) - D74-81 (E1) L-B - BR
D74-36 (IGT5) - D74-81 (E1) G-R - BR
D74-35 (IGT6) - D74-81 (E1) G - BR
D74-104 (IGF1) - D74-81 (E1) G-B - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
Idling Pulse generation (See  6 waveform 6)
D74-63 (PRG) - D74-81 (E1) L-B - BR Purge VSV Ignition switch ON 11 to 14 V
Idling Pulse generation (See  7 waveform 7)
A24-13 (SPD) - D74-81 (E1) B - BR Speed signal from combination meter Ignition switch ON, Driving wheel rotated slowly Pulse generation (See  8 waveform 8)
A24-46 (STA) - D74-81 (E1) R - BR Starter signal Cranking 6.0 V or more
A24-36 (STP) - D74-81 (E1) LG - BR Stop light switch Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A24-35 (ST1-) - D74-81 (E1) R - BR Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal depressed Below 1.5 V
Ignition switch ON, Brake pedal released 7.5 to 14 V
D74-120 (NSW) - D74-81 (E1) L - BR Park/Neutral position switch Ignition switch ON, Shift lever position in P or N Below 3.0 V
Ignition switch ON, Shift lever position other than P and N 11 to 14 V
D74-19 (M+) - D74-82 (ME01) R - W-B Throttle actuator Idling with warm engine Pulse generation (See  9 waveform 9)
D74-18 (M-) - D74-82 (ME01) G - W-B Throttle actuator Idling with warm engine Pulse generation (See  10 waveform 10)
A24-48 (FC) - D74-81 (E1) L - BR Fuel pump control Ignition switch ON 11 to 14 V
A24-24 (W) - D74-81 (E1) P - BR MIL Ignition switch ON Below 3.0 V
Idling 11 to 14 V
A24-16 (TC) - D74-81 (E1) R - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A24-15 (TACH) - D74-81 (E1) W - BR Engine speed Idling Pulse generation (See  11 waveform 11)
D74-62 (ACIS) - D74-81 (E1) R-W - BR VSV for ACIS Ignition switch ON 11 to 14 V
D74-72 (PSW) - D74-81 (E1) L - BR P/S pressure switch Ignition switch ON 11 to 14 V
A24-30 (VPMP) - D74-81 (E1) V - BR Vent valve (built into canister pump module) Ignition switch ON 11 to 14 V
A24-49 (MPMP) - D74-81 (E1) G - BR Leak detection pump (built into canister pump module) Leak detection pump OFF 0 to 3 V
Leak detection pump ON 11 to 14 V
D74-121 (PPMP) - D74-97 (ETHW) P - BR Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
D74-28 (AIRV) - D74-81 (E1) BR - BR Air switching valve (bank 1) for secondary air injection system Idling 11 to 14 V
A24-43 (ARV2) - D74-81 (E1) V - BR Air switching valve (bank 2) for secondary air injection system Idling 11 to 14 V
D74-54 (AIRP) - D74-81 (E1) P - BR Air pump (bank 1) control Idling 11 to 14 V
D74-53 (ARP2) - D74-81 (E1) P-L - BR Air pump (bank 2) control Idling 11 to 14 V
D74-30 (AID1) - D74-81 (E1) G - BR Diagnostic information signal for air injection system Air injection system operates Pulse generation (See  14 waveform 14)
D74-29 (AID2) - D74-81 (E1) G - BR Diagnostic information signal for air injection system Air injection system operates Pulse generation (See  14 waveform 14)
A24-54 (AIP) - D74-98 (ETHA) Y - BR Secondary air injection system pressure signal Ignition switch ON 4.5 to 5.0 V
A24-53 (AIP2) - D74-98 (ETHA) G - BR Secondary air injection system pressure signal Ignition switch ON 4.5 to 5.0 V
A24-10 (CANH) - D74-81 (E1) GR - BR CAN communication line Ignition switch ON Pulse generation (See  12 waveform 12)
A24-11 (CANL) - D74-81 (E1) W - BR CAN communication line Ignition switch ON Pulse generation (See  13 waveform 13)
A24-52 (FPC) - D74-81 (E1) BE - BR Fuel pump control Ignition switch ON 11 to 14 V
A24-18 (DI) - D74-81 (E1) L - BR Fuel pump control Ignition switch ON 0 to 3.0 V
A24-14 (STSW) - D74-81 (E1) BR - BR Ignition switch signal Shift lever position P or N, ignition switch START 6.0 V or more
A24-41 (ACCR) - D74-81 (E1) BR - BR ACC (Accessory) relay control signal Cranking Below 1.5 V
D74-16 (STAR) - D74-81 (E1) L - BR Starter relay control Ignition switch ON Below 1.5 V
Cranking 6.0 V or more
(1) 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

    ECM Terminal Name Between OC1+ and OC1- or OC2+ and OC2-
    Tester Range 5 V/DIV., 1 msec./DIV.,
    Condition Idling
    Fig 2: Identifying Waveform 1
    G06227296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 

    Heated oxygen sensor 

    WAVEFORM REFERENCE

    ECM Terminal Name Between OX1B and E2 or OX2B and E2
    Tester Range 0.2 V/DIV., 200 msec./DIV.
    Condition Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    HINT:

    In the Data List, item O2S B1S2 or O2S B2S2 shows the ECM input values from the heated oxygen sensor.

    Fig 3: Identifying Waveform 2
    G06227297Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. WAVEFORM 3 

    Fuel injector 

    WAVEFORM REFERENCE

    ECM Terminal Name Between #10 (to 60) and E01
    Tester Range 30 V/DIV., 20 msec./DIV.
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 4: Identifying Waveform 3
    G06227298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. WAVEFORM 4 

    Knock sensor 

    WAVEFORM REFERENCE

    ECM Terminal Name Between KNK1 and EKNK or KNK2 and EKN2
    Tester Range 1 V/DIV., 0.01 to 1 msec./DIV.
    Condition Engine speed maintained at 4000 rpm after warming up engine

    HINT:

    • The wavelength becomes shorter as the engine rpm increases.
    • The waveforms and amplitudes displayed on the Techstream differ slightly depending on the vehicle.
      Fig 5: Identifying Waveform 4
      G06227299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. WAVEFORM 5 
    1. Crankshaft position sensor
    2. VVT sensor
    WAVEFORM REFERENCE

    ECM Terminal Name
    1. Between NE+ and NE-
    2. Between VV+ and VV1- or VV2+ and VV2-
    Tester Range 2 V/DIV., 20 msec./DIV.
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 6: Identifying Waveform 5
    G06227300Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. WAVEFORM 6 
    1. Igniter IGT signal (from ECM to igniter)
    2. Igniter IGF signal (from igniter to ECM)
      WAVEFORM REFERENCE

      ECM Terminal Name
      1. Between IGT (1 to 6) and E1
      2. Between IGF1 and E1
      Tester Ranges 2 V/DIV., 20 msec./DIV.
      Condition Idling

      HINT:

      The wavelength becomes shorter as the engine rpm increases.

      Fig 7: Identifying Waveform 6
      G06227301Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. WAVEFORM 7 

    Purge VSV 

    WAVEFORM REFERENCE

    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV., 10 to 100 msec./DIV.
    Condition Idling

    HINT:

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

    Fig 8: Identifying Waveform 7
    G06227302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. WAVEFORM 8 

    Vehicle speed signal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between SPD and E1
    Tester Range 2 V/DIV., 20 msec./DIV.
    Condition Ignition switch ON, Rotate driving wheel slowly

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

    Fig 9: Identifying Waveform 8
    G06227303Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. WAVEFORM 9 

    Throttle actuator positive terminal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between M+ and ME01
    Tester Range 5 V/DIV., 1 msec./DIV.
    Condition Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 10: Identifying Waveform 9
    G06227304Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. WAVEFORM 10 

    Throttle actuator negative terminal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between M- and ME01
    Tester Range 5 V/DIV., 1 msec./DIV.
    Condition Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Identifying Waveform 10
    G06227305Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. WAVEFORM 11 

    Engine speed signal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between TACH and E1
    Tester Range 5 V/DIV., 10 msec./DIV.
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 12: Identifying Waveform 11
    G06227306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. WAVEFORM 12 

    CAN communication signal (Reference) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between CANH and E1
    Tester Range 1 V/DIV., 10 μsec./DIV.
    Condition Ignition switch ON

    HINT:

    The wavelength varies depending on the CAN communication signal.

    Fig 13: Identifying Waveform 12
    G06227307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 

    CAN communication signal (Reference) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between CANL and E1
    Tester Range 1 V/DIV., 10 μsec/DIV.
    Condition Ignition switch ON

    HINT:

    The wavelength varies depending on the CAN communication signal.

    Fig 14: Identifying Waveform 13
    G06227308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. WAVEFORM 14 

    Terminal AID of air injection control driver 

    WAVEFORM REFERENCE

    ECM Terminal Name Between AID1 and E1 or AID2 and E1
    Tester Range 5 V/DIV., 100 msec./DIV.
    Condition Performing Active Test using Techstream (air injection system)
    Fig 15: Identifying Waveform 14
    G06227309Courtesy 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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