ECD SYSTEM TERMINALS OF ECM


  1. CHECK ECM

    A01TCK7N10

    1. Measure the voltage, resistance or waveform of the ECM connector.

      Tech Tips

      The standard voltage, resistance and waveform of each ECM terminal is shown in the table below.

      In the table, first follow the information in "Condition". Look at "Terminal No. (Symbol)" for the terminals to be inspected. The standard voltage, resistance and waveform between the terminals is shown in "Specified Condition".

      Use the illustration above as a reference for the ECM terminals.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A118-1 (+B) - B164-109 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
      A118-2 (BATT) - B164-109 (E1) W - BR Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
      A118-4 (CANN) - B164-109 (E1) SB - BR CAN communication line Ignition switch ON

      Pulse generation

      (See waveform 1)
      A118-5 (CANP) - B164-109 (E1) B - BR CAN communication line Ignition switch ON

      Pulse generation

      (See waveform 2)
      A118-6 (CANL) - B164-109 (E1) W - BR CAN communication line Ignition switch ON

      Pulse generation

      (See waveform 1)
      A118-7 (CANH) - B164-109 (E1) B - BR CAN communication line Ignition switch ON

      Pulse generation

      (See waveform 2)
      A118-12 (W) - B164-109 (E1) LG - BR MIL MIL illuminated Below 3 V
      MIL not illuminated 11 to 14 V
      A118-13 (TACH) - B164-109 (E1) GR - BR Engine speed Idling

      Pulse generation

      (See waveform 3)
      A118-14 (SPD) - B164-109 (E1) V - BR Speed signal from combination meter Ignition switch ON, drive wheels rotating slowly

      Pulse generation

      (See waveform 4)
      A118-20 (+B2) - B164-109 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
      A118-21 (FANH) - B164-109 (E1) W - BR FAN NO. 1, 2 relay Idling with high engine coolant temperature Below 1.5 V
      A118-22 (FANL) - B164-109 (E1) R - BR FAN NO. 3 relay Ignition switch ON 11 to 14 V

      Idling with A/C on

      or high engine coolant temperature

      		 Below 1.5 V
      A118-25 (IGSW) - B164-109 (E1) B - BR Ignition switch Ignition switch ON 11 to 14 V
      A118-26 (TC) - B164-109 (E1) P - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
      A118-34 (ST1-) - B164-109 (E1) R - BR Stop light switch assembly Ignition switch ON, brake pedal depressed Below 1.5 V
      Ignition switch ON, brake pedal released 7.5 to 14 V
      A118-35 (STP) - B164-109 (E1) L - BR Stop light switch assembly Ignition switch ON, brake pedal depressed 7.5 to 14 V
      Ignition switch ON, brake pedal released Below 1.5 V
      A118-43 (STA) - B164-109 (E1) LG - BR Starter signal Cranking 5.5 V or higher
      A118-44 (IREL) - B164-109 (E1) G - BR EDU relay Idling 0 to 1.5 V
      A118-45 (MREL) - B164-109 (E1) GR - BR EFI-MAIN relay Ignition switch ON 11 to 14 V
      2 seconds elapsed since ignition switch off 0 to 1.5 V
      A118-53 (VPA) - A118-56 (EPA) W - Y Accelerator pedal sensor assembly (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
      A118-54 (VPA2) - A118-58 (EPA2) R - P Accelerator pedal sensor assembly (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 4.75 V
      A118-55 (VCPA) - A118-56 (EPA) B - Y Power source of accelerator pedal sensor assembly (for VPA1) Ignition switch ON 4.5 to 5.5 V
      A118-57 (VCP2) - A118-58 (EPA2) L - P Power source of accelerator pedal sensor assembly (for VPA2) Ignition switch ON 4.5 to 5.5 V
      A118-60 (NEO) - B164-109 (E1) L - BR Camshaft position sensor signal Idling with warm engine

      Pulse generation

      (See waveform 5)
      B164-27 (GLDO) - B164-109 (E1) R - BR Glow plug controller Glow plug on Pulse generation
      B164-41 (PCV+) - B164-81 (PCV-) R - W Suction control valve Idling or cranking with warm engine

      Pulse generation

      (See waveform 6)
      B164-42 (M+) - B164-84 (ME01) P - W-B Throttle valve duty signal Engine warmed up, engine racing Pulse generation
      B164-43 (M-) - B164-84 (ME01) L - W-B Throttle valve duty signal Engine warmed up, engine racing Pulse generation
      B164-44 (E02) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
      B164-45 (E01) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
      B164-46 (E05) - Body ground W-B - - Earth (ground) circuit of ECM Always Below 1 Ω
      B164-47 (#4) - B164-109 (E1) R - BR Injector assembly Idling

      Pulse generation

      (See waveform 7)
      B164-48 (#3) - B164-109 (E1) B - BR
      B164-49 (#2) - B164-109 (E1) G - BR
      B164-50 (#1) - B164-109 (E1) GR - BR
      B164-51 (INJF) - B164-109 (E1) P - BR Injector driver (EDU) Idling

      Pulse generation

      (See waveform 8)
      B164-52 (PRD) - B164-109 (E1) L - BR Pressure discharge valve drive signal Engine warmed up, engine racing

      Pulse generation

      (See waveform 9)
      B164-54 (ALT) - B164-109 (E1) L - BR Generator assembly duty ratio Idling

      Pulse generation

      (See waveform 10)
      B164-56 (GLDI) - B164-109 (E1) V - BR Glow plug controller Glow plug on Pulse generation
      B164-58 (GREL) - B164-109 (E1) L - BR Glow plug relay assembly Ignition switch ON 11 to 14 V
      B164-62 (IDLO) - B164-109 (E1) W - BR Injector driver (EDU) Idling 4 to 5.5 V
      B164-65 (VG) - B164-64 (EVG) LG - BR Mass air flow meter assembly power source Ignition switch ON Pulse generation
      B164-66 (PCR1) - B164-67 (E2M) P - V Fuel pressure sensor (main) Idling 1.8 to 2.1 V
      B164-68 (VCM) - B164-67 (E2M) W - V Power source of fuel pressure sensor (for PCR1) Ignition switch ON 4.5 to 5.5 V
      B164-69 (VCS) - B164-91 (E2S) R - G Power source of fuel pressure sensor (for PCR2) Ignition switch ON 4.5 to 5.5 V
      B164-75 (VCPM) - B164-72 (EPIM) R - Y Power source of manifold absolute pressure sensor Ignition switch ON 4.5 to 5.5 V
      B164-75 (VCPM) - B164-74 (EPEX) R - G Power source of differential pressure sensor assembly Ignition switch ON 4.5 to 5.5 V
      B164-76 (THCF) - B164-77 (ETCF) P - V Exhaust gas temperature sensor Engine warmed up, idling 4.6 to 4.9 V
      B164-78 (VCG) - B164-109 (E1) B - BR Power source of camshaft position sensor Ignition switch ON 4.5 to 5.5 V
      B164-80 (G2+) - B164-79 (G2-) R - W Camshaft position sensor Idling

      Pulse generation

      (See waveform 11)
      B164-82 (GE01) - Body ground BR - - Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
      B164-83 (EOPV) - B164-109 (E1) L - BR Oil pressure switching valve assembly Idling Below 1.5 V
      B164-85 (EGM-) - B164-84 (ME01) W - W-B Electric EGR control valve assembly duty signal Engine warmed up, idling Pulse generation
      B164-86 (EGM+) - B164-84 (ME01) B - W-B Electric EGR control valve assembly duty signal Engine warmed up, idling Pulse generation
      B164-93 (VPOP) - B164-70 (EPOP) B - W Power source of oil pressure sender gauge assembly Ignition switch ON 4.5 to 5.5 V
      B164-94 (VCEG) - B164-95 (EEGL) G - R EGR valve position sensor Ignition switch ON 4.5 to 5.5 V
      B164-97 (VCVL) - B164-96 (EVLU) B - W Throttle position sensor Ignition switch ON 4.98 to 5.02 V
      B164-98 (PEX) - B164-74 (EPEX) L - G Differential pressure sensor assembly Ignition switch ON 0.4 to 4.8 V
      B164-101 (VNVC) - B164-100 (VNE2) B - Y Power source of nozzle vane position sensor Ignition switch ON 4.5 to 5.5 V
      B164-103 (NE+) - B164-102 (NE-) R - G Crankshaft position sensor Idling

      Pulse generation

      (See waveform 11)
      B164-104 (HAF2) - B164-46 (E05) G - W-B Air fuel ratio sensor heater Ignition switch ON 11 to 14 V
      B164-105 (FIV) - B164-109 (E1) B - BR Exhaust fuel addition injector assembly Engine warmed up, idling, every 1 to 2 minutes Pulse generation
      B164-106 (ECBV) - B164-109 (E1) Y - BR No. 1 vacuum switching valve assembly (for EGR cooler) No. 1 vacuum switching valve assembly (for EGR cooler) on Below 1.5 V
      No. 1 vacuum switching valve assembly (for EGR cooler) off 11 to 14 V
      B164-107 (M-) - B164-109 (E1) R - BR DC motor (turbocharger sub-assembly) Idling with warm engine

      Pulse generation

      (See waveform 12)
      B164-108 (M+) - B164-109 (E1) W - BR DC motor (turbocharger sub-assembly) Idling with warm engine

      Pulse generation

      (See waveform 12)
      B164-109 (E1) - Body ground BR - - Earth (ground) circuit of ECM Always Below 1 Ω
      B164-110 (THA) - B164-87 (ETHA) L - BR Intake air temperature sensor Idling, intake air temperature 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
      B164-111 (THW) - B164-88 (ETHW) B - BR Engine coolant temperature sensor Idling, engine coolant temperature 60 to 120°C (140 to 248°F) 0.2 to 1.0 V
      B164-112 (THF) - B164-89 (ETHF) GR - BR Fuel temperature sensor Ignition switch ON 0.5 to 3.4 V
      B164-113 (THIA) - B164-90 (ETHI) Y - G Intake air temperature sensor (turbo) Idling, intake air temperature at 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
      B164-114 (PCR2) - B164-91 (E2S) GR - G Fuel pressure sensor (sub) Idling 1.2 to 1.5 V
      B164-116 (POP) - B164-70 (EPOP) G - W Oil pressure sender gauge assembly Idling 0.1 to 0.9 V
      B164-117 (PIM) - B164-72 (EPIM) G - Y Manifold absolute pressure sensor Negative pressure of 40 kPa (300 mmHg, 11.8 in.Hg) applied 0.3 to 0.9 V
      Atmospheric pressure 0.8 to 1.4 V
      Positive pressure of 69 kPa (518 mmHg, 20.3 in.Hg) applied 1.6 to 2.2 V
      B164-118 (EGLS) - B164-95 (EEGL) L - R EGR valve position sensor Ignition switch ON 1.03 to 1.37 V
      B164-119 (VLU) - B164-96 (EVLU) LG - W Throttle position sensor Ignition switch ON, throttle valve fully opened 3.6 to 4.2 V
      B164-121 (THCO) - B164-120 (ETCO) P - BR No. 3 Exhaust gas temperature sensor Engine warmed up, idling 4.6 to 4.9 V
      B164-122 (THCI) - B164-99 (ETCI) L - BR No. 2 Exhaust gas temperature sensor Engine warmed up, idling 4.6 to 4.9 V
      B164-123 (RLFF) - B164-109 (E1) V - BR Pressure discharge valve confirmation signal Engine warmed up, engine racing

      Pulse generation

      (See waveform 9)
      B164-124 (VNA) - B164-100 (VNE2) G - Y Nozzle vane position sensor Ignition switch ON 2.3 to 2.7 V
      B164-125 (AF2+) - B164-46 (E05) L - W-B Air fuel ratio sensor Ignition switch ON 2.0 to 2.5 V
      B164-126 (AF2-) - B164-46 (E05) Y - W-B Air fuel ratio sensor Ignition switch ON 2.0 to 2.5 V
    2. A01TBSDE01
      *a 1 V/DIV.
      *b 10 μs./DIV.

      Using an oscilloscope, check waveform 1.

      Tech Tips

      The waveform varies depending on the CAN communication signal.

    3. A01T9A4E01
      4. *a 1 V/DIV.
      *b 10 μs./DIV.

Using an oscilloscope, check waveform 2.

Tech Tips

The waveform varies depending on the CAN communication signal.

  • A01TCZ8E01
    • *a 5 V/DIV.
    *b 10 ms./DIV.

    Using an oscilloscope, check waveform 3.

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  • A01TDDIE01
    • *a 5 V/DIV.
    *b 20 ms./DIV.

    Using an oscilloscope, check waveform 4.

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  • A01TCBYE03
    • *a 1 V/DIV.
    *b 2 ms./DIV.

    Using an oscilloscope, check waveform 5.

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  • A01TAPXE02
    • *a 10 V/DIV.
    *b 5 ms./DIV.

    Using an oscilloscope, check waveform 6.

    Tech Tips

    The waveform varies depending on the suction control valve operation.

  • A01T8QLE03
    • *a 5 V/DIV.
    *b 20 ms./DIV.

    Using an oscilloscope, check waveform 7.

    Tech Tips

    The waveform varies depending on the injector injection.

  • A01TDO2E02
    • *a 2 V/DIV.
    *b 20 ms./DIV.

    Using an oscilloscope, check waveform 8.

    Tech Tips

    The waveform varies depending on the injector injection.

  • A01T9BXE02

    Using an oscilloscope, check waveform 9.

    • Tech Tips

    The waveform becomes shorter as the engine speed.

  • A01TBFOE01
    • *a 5 V/DIV.
    *b 5 ms./DIV.

    Using an oscilloscope, check waveform 10.

  • A01TDBHE02

    Using an oscilloscope, check waveform 11.

    • Tech Tips

    The waveform varies depending on the engine speed.

  • A01TCNHE07
    • *a 5 V/DIV.
    *b 50 ms./ DIV.

    Using an oscilloscope, check waveform 12.

    Tech Tips

    The waveform varies depending on turbocharger sub-assembly operation.