ECD SYSTEM(w/o DPF) TERMINALS OF ECM

A01VKP0E02

Tech Tips

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 the checks should be compared with the standard normal voltage for that pair of terminals, which is displayed in the Specified Condition column.

The illustration above can be used as a reference to identify the ECM terminal locations.

Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
A59-1 (+B) - A59-2 (E1) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A59-61 (+B2) - A59-2 (E1) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A59-23 (BATT) - A59-2 (E1) V - W-B Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
A59-7 (IGSW) - A59-2 (E1) R - W-B Ignition switch Ignition switch ON 11 to 14 V
A59-22 (MREL) - A59-2 (E1) GR - W-B ECD MAIN relay Ignition switch ON 11 to 14 V
20 seconds elapsed after ignition switch off 0 to 1.5 V
B21-13 (GREL) - A59-2 (E1) W - W-B Glow plug relay assembly Ignition switch ON at cold engine 0 to 1.5 V
Idling with warm engine 11 to 14 V
A59-55 (VPA) - A59-57 (EPA) R - R Accelerator pedal sensor assembly (for engine control)

Ignition switch ON

Accelerator pedal fully released

 0.6 to 1.0 V

Ignition switch ON

Accelerator pedal fully depressed

 3.0 to 4.6 V
A59-52 (VPA2) - A59-54 (EPA2) L - B Accelerator pedal sensor assembly (for sensor malfunction detection)

Ignition switch ON

Accelerator pedal fully released

 1.4 to 1.8 V

Ignition switch ON

Accelerator pedal fully depressed

 3.7 to 5.0 V
A59-56 (VCPA) - A59-57 (EPA) B - R Power source of accelerator pedal sensor assembly (for VPA) Ignition switch ON 4.5 to 5.0 V
A59-53 (VCP2) - A59-54 (EPA2) W - B Power source of accelerator pedal sensor assembly (for VPA2) Ignition switch ON 4.5 to 5.0 V
A59-46 (VCTA) - A59-47 (ETA) W - R Power source of diesel throttle position sensor Ignition switch ON 4.5 to 5.0 V
A59-45 (VTA1) - A59-47 (ETA) B - R Diesel throttle position sensor Throttle valve fully opened 3.2 to 4.9 V
Throttle valve fully closed 0.5 to 1.1 V
A59-43 (M+) - A59-2 (E1) B - W-B Diesel throttle duty signal Engine racing Pulse generation
A59-42 (M-) - A59-2 (E1) W - W-B Diesel throttle duty signal Engine racing Pulse generation
A59-63 (H-) - A59-2 (E1) G - W-B Air fuel ratio sensor heater Ignition switch ON 11 to 14 V
Idling with warm engine

Pulse generation

(See waveform 1)
A59-69 (AF1+) - A59-2 (E1) W - W-B Air fuel ratio sensor signal Ignition switch ON 1.5 to 4.9 V
A59-70 (AF1-) - A59-2 (E1) BR - W-B Air fuel ratio sensor signal Ignition switch ON 2.35 to 2.65 V
A59-68 (TR) - A59-2 (E1) B - W-B Air fuel ratio sensor signal Ignition switch ON 1.5 to 4.9 V
A59-71 (RE) - A59-2 (E1) Y - W-B Air fuel ratio sensor signal Ignition switch ON 2.1 to 3.5 V
B21-29 (THF) - B21-28 (ETHF) W - R Fuel temperature sensor Idling 0.5 to 2.0 V
B21-15 (VCS) - B21-14 (E2S) BR - B Power source of fuel pressure sensor Ignition switch ON 4.5 to 5.0 V
B21-16 (PC) - B21-14 (E2S) R - B Fuel pressure sensor (Common rail pressure sensor) Idling 1.0 to 1.3 V
A59-11 (VG) - A59-12 (EVG) GR - V Mass air flow meter Idling Pulse generation
A59-30 (THA) - A59-31 (ETHA) P - R Intake air temperature sensor Idling, intake air temperature at 20°C (68°F) 0.5 to 2.0 V
B21-4 (PRV) - A59-2 (E1) Y - W-B Pressure control valve signal Drive vehicle at 50 km/h (31 mph) with third gear, and then decelerate by releasing accelerator pedal

Pulse generation

(See waveform 2)
B21-12 (PCV) - A59-2 (E1) L - W-B

Supply pump

(Suction control valve)

 Idling

Pulse generation

(See waveform 3)
B21-1 (IJ1+) - B21-21 (IJ1-) B - W Injector Idling Pulse generation
B21-2 (IJ2+) - B21-30 (IJ2-) R - W Injector Idling Pulse generation
B21-3 (IJ3+) - B21-31 (IJ3-) L - Y Injector Idling Pulse generation
B21-20 (IJ4+) - B21-32 (IJ4-) G - B Injector Idling Pulse generation
B21-40 (THW) - B21-39 (ETHW) L - BR Engine coolant temperature sensor Idling, engine coolant temperature at 80°C (176°F) 0.2 to 1.0 V
B21-8 (THIA) - B21-7 (ETHI) B - W Intake air temperature sensor (intake manifold) Idling, intake air temperature at 0 to 80°C (32 to 176°F) 0.5 to 2.0 V
A59-14 (VPIM) - A59-15 (EPIM) R - Y Power source of diesel turbo pressure sensor Ignition switch ON 4.5 to 5.0 V
A59-13 (PIM) - A59-15 (EPIM) G - Y Diesel turbo pressure sensor

Ignition switch ON

(same as atmosphere pressure)

 0.8 to 1.4 V
B21-19 (NE+) - B21-18 (NE-) L - P Crankshaft position sensor Idling

Pulse generation

(See waveform 4)
B21-11 (G+) - B21-10 (G-) G - R Camshaft position sensor Idling

Pulse generation

(See waveform 4)
B21-37 (VNVC) - B21-36 (VNE2) G - L Power source of nozzle vane position sensor Ignition switch ON 4.5 to 5.0 V
B21-38 (VTAI) - B21-36 (VNE2) R - L Nozzle vane position sensor VN turbocharger fully closed 0.9 to 2.1 V
VN turbocharger fully opened 3.0 to 4.1 V
B21-34 (M+) - A59-2 (E1) BR - W-B VN turbocharger motor Idling with warm engine Pulse generation
B21-33 (M-) - A59-2 (E1) Y - W-B VN turbocharger motor Idling with warm engine Pulse generation
A59-40 (ECBV) - A59-2 (E1) W - W-B VSV for EGR cooler bypass valve Ignition switch ON at cold engine 0 to 1.5 V
Idling with warm engine 11 to 14 V
B21-26 (VCEG) - B21-25 (EEGL) Y - L Power source of EGR valve position sensor Ignition switch ON 4.5 to 5.0 V
B21-23 (EGM+) - A59-2 (E1) B - W-B EGR valve motor Idling with warm engine Pulse generation
B21-22 (EGM-) - A59-2 (E1) W - W-B EGR valve motor Idling with warm engine Pulse generation
B21-27 (EGLS) - B21-25 (EEGL) P - L EGR valve position sensor EGR valve fully closed 0.8 to 1.6 V
EGR valve fully opened 3.6 to 4.4 V
A59-5 (D) - A59-2 (E1) B - W-B No. 2 clutch start switch assembly

Ignition switch ON

Clutch pedal released

 11 to 14 V

Ignition switch ON

Clutch pedal depressed

 0 to 1.5 V
A59-6 (STA) - A59-2 (E1) BR - W-B Starter signal Cranking 6.0 V or more
A59-80 (TACH) - A59-2 (E1) LG - W-B Engine speed Idling Pulse generation
A59-29 (STP) - A59-2 (E1) LG - W-B Stop light switch Brake pedal depressed 7.5 to 14 V
Brake pedal released 0 to 1.5 V
A59-28 (ST1-) - A59-2 (E1) B - W-B

Stop light switch

(opposite to STP)

 Brake pedal depressed 0 to 1.5 V
Brake pedal released 7.5 to 14 V
A59-25 (SPD) - A59-2 (E1) V - W-B Speed signal from combination meter Ignition switch ON driving wheel rotating slowly

Pulse generation

(See waveform 5)
A59-37 (W) - A59-2 (E1) B - W-B MIL MIL illuminated 0 to 3 V
MIL not illuminated 11 to 14 V
A59-24 (TC) - A59-2 (E1) L - W-B Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A59-20 (FANL) - A59-2 (E1) R - W-B Cooling fan relay Ignition switch ON 11 to 14 V
Idling with warm engine 0 to 1.5 V
A59-21 (FANH) - A59-2 (E1) G - W-B No. 2 cooling fan relay Idling with high engine coolant temperature 0 to 1.5 V
A59-10 (ELS) - A59-2 (E1) G - W-B Electric load Tail light switch ON 7.5 to 14 V
Tail light switch off 0 to 1.5 V
A59-27 (ELS2) - A59-2 (E1) B - W-B Electric load Defogger switch ON 7.5 to 14 V
Defogger switch off 0 to 1.5 V
A59-26 (MHSW) - A59-2 (E1)*1 W - W-B Power heater switch signal Power heater switch ON 11 to 14 V
A59-9 (R) - A59-2 (E1) R - W-B Back-up light switch signal Back-up light switch on 11 to 14 V
A59-3 (CANH) - A59-2 (E1) L - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 6)
A59-4 (CANL) - A59-2 (E1) W - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 7)
A59-17 (CANP) - A59-2 (E1) B - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 6)
A59-16 (CANN) - A59-2 (E1) W - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 7)
A59-79 (NEO) - A59-2 (E1)*2 V - W-B Crankshaft Position Sensor Idling

Pulse generation

(See waveform 8)


  1. Waveform 1

    A01VJ0HE01
    *a 5 V/DIV.
    *b 2 ms/DIV.
    Air Fuel Ratio Sensor Heater
    ECM Terminal Name H- - E1
    Tester Range 5 V/DIV., 2 ms/DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength varies depending on the engine operating condition.

  2. Waveform 2

    A01VI0XE01
    *1 10 V/DIV.
    *2 0.5 ms/DIV.
    Pressure Control Valve Signal
    ECM Terminal Name PRV - E1
    Tester Range 10 V/DIV., 0.5 ms/DIV.
    Condition Drive vehicle at 50 km/h (31 mph) with third gear, and then decelerate by releasing accelerator pedal

    Tech Tips

    The waveform varies depending on the pressure control valve operation.

  3. Waveform 3

    A01VLNEE01
    *a 10 V/DIV.
    *b 5 ms/DIV.
    Suction Control Valve Signal
    ECM Terminal Name PCV - E1
    Tester Range 10 V/DIV., 5 ms/DIV.
    Condition Idling or cranking with warm engine

    Tech Tips

    The waveform varies depending on the suction control valve operation.

  4. Waveform 4

    A01VITEE01
    *a 5 V/DIV.
    *b 10 ms/DIV.
    Crankshaft Position Sensor and Camshaft Position Sensor Signal
    ECM Terminal Name

    NE+ - NE-

    G+ - G-
    Tester Range 5 V/DIV., 10 ms/DIV.
    Condition Idling

    Tech Tips

    The waveform varies depending on the engine speed.

  5. Waveform 5

    A01VLPZE01
    *a 1 V/DIV.
    *b 10 ms/DIV.
    Vehicle Speed Signal
    ECM Terminal Name SPD - E1
    Tester Range 1 V/DIV., 10 ms/DIV.
    Condition While driving vehicle

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  6. Waveform 6

    A01VLSNE01
    *a 1 V/DIV.
    *b 10 μs/DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name

    CANH - E1

    CANP - E1
    Tester Range 1 V/DIV., 10 μs/DIV.
    Condition Engine stopped, ignition switch ON

    Tech Tips

    The wavelength varies depending on the CAN communication signal.

  7. Waveform 7

    A01VHQ1E01
    *a 1 V/DIV.
    *b 10 μs/DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name

    CANL - E1

    CANN - E1
    Tester Range 1 V/DIV., 10 μs/DIV.
    Condition Engine stopped, ignition switch ON

    Tech Tips

    The wavelength varies depending on the CAN communication signal.

  8. Waveform 8

    A01VK7VE01
    *a 5 V/DIV.
    *b 1 ms/DIV.
    Crankshaft Position Sensor Signal
    ECM Terminal Name NEO - E1
    Tester Range 5 V/DIV., 1 ms/DIV.
    Condition Idling

    Tech Tips

    The wavelength varies depending on the crankshaft position sensor signal.