ECD SYSTEM TERMINALS OF ECM

A01CIN6E53

Tech Tips

Each ECM terminal's standard voltage is shown in the table below.

In the table, first follow the information under "Condition". Look under "Terminal No. (Symbols)" for the terminals to be inspected. The standard voltage between the terminals is shown under "Specified Condition".

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

Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
E24-2 (BATT) - E23-7 (E1) L-R - BR Battery (for measuring battery voltage and for ECM memory) Constant 11 to 14 V
E25-16 (IGSW) - E23-7 (E1) GR - BR Ignition switch Ignition switch ON 11 to 14 V
E25-1 (+B) - E23-7 (E1) B-R - BR Power source of ECM Ignition switch ON 11 to 14 V
E25-13 (MREL) - E23-7 (E1) GR-R - BR ENG-3 relay operation signal Ignition switch ON 11 to 14 V
E25-13 (MREL) - E23-7 (E1) GR-R - BR ENG-3 relay operation signal 5 seconds pass after ignition switch off 0 to 2 V
E22-18 (VC) - E23-7 (E1) L-B - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
E25-15 (SREL) - E23-7 (E1) R-L - BR GLOW MAIN relay operation signal Ignition switch ON, glow indicator light on 11 to 14 V
E25-15 (SREL) - E23-7 (E1) R-L - BR GLOW MAIN relay operation signal Engine is warmed up: Idling 0 to 2 V
E25-11 (GIND) - E23-7 (E1) Y-G - BR Glow indicator Ignition switch ON, glow indicator light on 0 to 2 V
E25-11 (GIND) - E23-7 (E1) Y-G - BR Glow indicator Engine is warmed up: Idling 18 to 27 V
E25-22 (VPA) - E25-28 (EPA) BR-R - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, accelerator pedal fully released 0.6 to 1.0 V
E25-22 (VPA) - E25-28 (EPA) BR-R - LG-B Accelerator pedal position sensor (for engine control) Ignition switch ON, accelerator pedal fully depressed 2.8 to 3.6 V
E25-23 (VPA2) - E25-29 (EPA2) R-W - GR-G Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, accelerator pedal fully released 1.4 to 1.8 V
E25-23 (VPA2) - E25-29 (EPA2) R-W - GR-G Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, accelerator pedal fully depressed 3.6 to 4.4 V
E25-20 (VCPA) - E25-28 (EPA) B-O - LG-B Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
E25-21 (VCP2) - E25-29 (EPA2) G-W - GR-G Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
E23-24 (VG) - E23-32 (EVG) G - V-R Mass air flow meter sub-assembly Engine is warmed up: Idling 1.5 to 1.9 V
E22-31 (THA) - E22-28 (E2) V-G - R-B Intake air temperature sensor (built into mass air flow meter sub-assembly) Engine is warmed up: Idling, intake air temperature at 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
E22-20 (THIA) - E22-28 (E2) Y-R - R-B Intake air temperature sensor (after turbocharged) Engine is warmed up: Idling, intake air temperature at 0 to 80°C (32 to 176°F) 1.0 to 4.4 V
E22-19 (THW) - E22-28 (E2) G-R - R-B Engine coolant temperature sensor Idling, engine coolant temperature at 80 to 120°C (176 to 248°F) 0.2 to 1.0 V

E22-24 (#1) - E23-7 (E1)

E22-23 (#2) - E23-7 (E1)

E22-22 (#3) - E23-7 (E1)

E22-21 (#4) - E23-7 (E1)

P-L - BR

LG - BR

LG-B - BR

GR - BR

 Injector assembly Engine is warmed up: Idling

Pulse generation

(See waveform 1)
E23-23 (G+) - E23-31 (G-) R - G Camshaft position sensor Engine is warmed up: Idling

Pulse generation

(See waveform 2)
E22-27 (NE+) - E22-34 (NE-) B - W Crankshaft position sensor Engine is warmed up: Idling

Pulse generation

(See waveform 2)
E25-18 (STP) - E23-7 (E1) V - BR Stop light switch assembly Ignition switch ON, brake pedal depressed 18 to 27 V
E25-18 (STP) - E23-7 (E1) V - BR Stop light switch assembly Ignition switch ON, brake pedal released 0 to 2 V
E25-8 (ST1-) - E23-7 (E1) V-Y - BR Stop light switch assembly (opposite to STP) Brake pedal depressed 0 to 2 V
E25-8 (ST1-) - E23-7 (E1) V-Y - BR Stop light switch assembly (opposite to STP) Brake pedal released 18 to 27 V
E25-17 (TC) - E23-7 (E1) R-B - BR Terminal TC of DLC3 Ignition switch ON 18 to 27 V
E23-18 (STA) - E23-7 (E1) B-W - BR Starter signal Cranking 6 V or more
E25-6 (TAC) - E23-7 (E1) P - BR Engine speed Idling

Pulse generation

(See waveform 3)
E25-9 (W) - E23-7 (E1) Y-R - BR MIL MIL illuminated 0 to 2 V
E25-9 (W) - E23-7 (E1) Y-R - BR MIL MIL not illuminated 18 to 27 V
E25-19 (SPD) - E23-7 (E1) R-Y - BR Speed signal from tachograph assembly Ignition switch ON, driving wheel slowly rotated

Pulse generation

(See waveform 4)
E23-28 (PIM) - E22-28 (E2) P-G - R-B Manifold absolute pressure sensor Applied negative pressure of 93 kPa (697 mmHg, 27.5 in.Hg) 0.25 to 0.4 V
E23-28 (PIM) - E22-28 (E2) P-G - R-B Manifold absolute pressure sensor Applied positive pressure of 150 kPa (1128 mmHg, 44.3 in.Hg) 1.0 to 1.4 V
E22-10 (IREL) - E23-7 (E1) R - BR EDU relay operation signal Ignition switch off 11 to 14 V
E22-10 (IREL) - E23-7 (E1) R - BR EDU relay operation signal Idling 0 to 2 V
E22-26 (PCR1) - E22-28 (E2) L-W - R-B Fuel pressure sensor (built into common rail assembly)

Idling (Approximately 30 MPa (306 kgf/cm2, 4351 psi))

 1.3 to 1.7 V
E22-29 (THF) - E22-28 (E2) Y - R-B Fuel temperature sensor (built into injection or supply pump assembly) Ignition switch ON 1.2 to 1.6 V
E23-22 (VCG) - E23-31 (G-) L-R - G Camshaft position sensor Ignition switch ON 4.5 to 5.5 V
E22-2 (PCV+) - E22-1 (PCV-) L - L-Y Suction control valve (built into injection or supply pump assembly) Idling

Pulse generation

(See waveform 5)
E23-33 (EGLS) - E22-28 (E2) G-Y - R-B EGR position sensor (built into EGR valve assembly) Ignition switch ON 3.8 to 4.2 V
E23-33 (EGLS) - E22-28 (E2) G-Y - R-B EGR position sensor (built into EGR valve assembly) Engine is warmed up, Idling 3.0 to 3.5 V
E23-3 (EGRS) - E23-7 (E1) G - BR EGR valve assembly Ignition switch ON 0 to 2 V
E23-3 (EGRS) - E23-7 (E1) G - BR EGR valve assembly Engine is warmed up, engine speed 1500 rpm

Pulse generation

(See waveform 6)
E22-25 (INJF) - E23-7 (E1) B - BR Injector driver assembly Idling

Pulse generation

(See waveform 7)
E23-20 (VLU) - E22-28 (E2) Y-B - R-B Throttle position sensor (built into diesel throttle body assembly) Throttle valve fully closed 2.6 to 3.0 V
E23-20 (VLU) - E22-28 (E2) Y-B - R-B Throttle position sensor (built into diesel throttle body assembly) Throttle valve fully open 1.4 to 1.8 V
E23-4 (LUSL) - E23-7 (E1) W - BR Throttle actuator (built into diesel throttle body assembly) duty signal Accelerator pedal released → Accelerator pedal depressed (when throttle actuator is operating)

Pulse generation

(See waveform 8)
E23-1 (THCO) - E22-28 (E2) W-L - R-B Exhaust gas temperature sensor (downstream) Engine is warmed up, idling 4.5 to 4.9 V
E23-2 (THCI) - E22-28 (E2) W-R - R-B Exhaust gas temperature sensor (upstream) Engine is warmed up, idling 4.5 to 4.9 V
E23-27 (PEX) - E22-28 (E2) P-L - R-B Differential pressure sensor assembly Engine is warmed up, idling 0.5 to 1.0 V
E24-15 (RGSW) - E23-7 (E1) P-L - BR DPF switch signal DPF switch on 18 to 27 V
E24-15 (RGSW) - E23-7 (E1) P-L - BR DPF switch signal DPF switch off 0 to 2 V
E23-8 (EXB) - E23-7 (E1) P-L - BR Exhaust brake Exhaust brake operating 11 to 14 V
E25-10 (W2) - E23-7 (E1) B-W - BR DPF indicator DPF indicator on (ignition switch ON) 0 to 2 V
E25-10 (W2) - E23-7 (E1) B-W - BR DPF indicator DPF indicator off (idling) 18 to 27 V
E23-16 (PMB) - E23-7 (E1) B-W - BR DPF warning buzzer (vacuum warning buzzer assembly) Buzzer off 18 to 27 V
E23-16 (PMB) - E23-7 (E1) B-W - BR DPF warning buzzer (vacuum warning buzzer assembly) Buzzer on 0 to 2 V
E24-16 (NUSW) - E23-7 (E1) B-O - BR Exhaust brake neutral switch assembly Ignition switch ON, shift position is neutral 11 to 14 V
E24-16 (NUSW) - E23-7 (E1) B-O - BR Exhaust brake neutral switch assembly Ignition switch ON, shift position is not neutral 0 to 2 V
E24-9 (CLSW) - E23-7 (E1) O - BR Exhaust brake clutch switch (exhaust retarder switch assembly) Clutch pedal depressed 0 to 2 V
E24-9 (CLSW) - E23-7 (E1) O - BR Exhaust brake clutch switch (exhaust retarder switch assembly) Clutch pedal released 18 to 27 V
E24-13 (EXSW) - E23-7 (E1) L-W - BR Exhaust brake switch (turn signal switch assembly) Exhaust brake switch on 18 to 27 V
E24-13 (EXSW) - E23-7 (E1) L-W - BR Exhaust brake switch (turn signal switch assembly) Exhaust brake switch off 0 to 2 V
E24-11 (HSW) - E23-7 (E1) BR-W - BR Warm up switch Warm up switch on 18 to 27 V
E24-11 (HSW) - E23-7 (E1) BR-W - BR Warm up switch Warm up switch off 0 to 2 V
E24-17 (CANH) - E23-7 (E1) W - BR CAN communication line Engine stopped, ignition switch ON

Pulse generation

(See waveform 9)
E24-28 (CANL) - E23-7 (E1) B - BR CAN communication line Engine stopped, ignition switch ON

Pulse generation

(See waveform 10)
E24-21 (AC) - E23-7 (E1) V-W - BR Air conditioning signal Air conditioning on 18 to 27 V
E24-21 (AC) - E23-7 (E1) V-W - BR Air conditioning signal Air conditioning off 0 to 2 V
E24-19 (ACT) - E23-7 (E1) G - BR Air conditioning cut signal Ignition switch ON 18 to 27 V
E24-19 (ACT) - E23-7 (E1) G - BR Air conditioning cut signal Air conditioning cut signal on 0 to 2 V
E24-30 (ABS) - E23-7 (E1) V-R - BR Anti-lock brake system operation Anti-lock brake system does not operate 11 to 14 V
E24-30 (ABS) - E23-7 (E1) V-R - BR Anti-lock brake system operation Anti-lock brake system operate 0 to 2 V
E23-7 (E1) - Body ground BR - Body ground Ground circuit of ECM Always Below 1 Ω
E22-28 (E2) - Body ground R-B - Body ground Ground circuit of ECM Always Below 1 Ω
E22-7 (E01) - Body ground BR - Body ground Ground circuit of ECM Always Below 1 Ω
E22-6 (E02) - Body ground BR - Body ground Ground circuit of ECM Always Below 1 Ω
E23-19 (EC) - Body ground W-B - Body ground Ground circuit of ECM Always Below 1 Ω

  1. Waveform 1


    1. A01CGYCE01

      Injector Assembly No. 1 Injection Signal (A)

    2. Injector Assembly No. 2 Injection Signal (B)

    3. Injector Assembly No. 3 Injection Signal (C)

    4. Injector Assembly No. 4 Injection Signal (D)

      Terminal No. (Symbols)

      (A) E22-24 (#1) - E22-7 (E1)

      (B) E22-22 (#3) - E22-7 (E1)

      (C) E22-21 (#4) - E22-7 (E1)

      (D) E22-23 (#2) - E22-7 (E1)
      Tool Setting 5 V/DIV., 20 ms./DIV.
      Condition Engine is warmed up: Idling

      Tech Tips

      The waveform varies depending on the injector injection.

  2. Waveform 2


    1. A01CHGRE01

      Crankshaft Position Sensor Signal (A)

    2. Camshaft Position Sensor Signal (B)

      Terminal No. (Symbols)

      (A) E22-27 (NE+) - E22-34 (NE-)

      (B) E23-23 (G+) - E23-31 (G-)
      Tool Setting 5 V/DIV., 20 ms./DIV.
      Condition Engine is warmed up: Idling

      Tech Tips

      The waveform varies depending on the engine revolution.

  3. Waveform 3


    1. A01CI2XE01

      Engine Speed Signal

      Terminal No. (Symbols) E25-6 (TAC) - E23-7 (E1)
      Tool Setting 5 V/DIV., 20 ms./DIV.
      Condition Idling

      Tech Tips

      The wavelength becomes shorter as the engine speed increases.

  4. Waveform 4


    1. A01CGNYE01

      Vehicle Speed Signal

      Terminal No. (Symbols) E25-19 (SPD) - E23-7 (E1)
      Tool Setting 5 V/DIV., 20 ms./DIV.
      Condition Ignition switch ON, driving wheel slowly rotated

      Tech Tips

      The wavelength becomes shorter as the vehicle speed increases.

  5. Waveform 5


    1. A01CH92E01

      Suction Control Valve Signal

      Terminal No. (Symbols) E22-2 (PCV+) - E22-1 (PCV-)
      Tool Setting 10 V/DIV., 5 ms./DIV.
      Condition Idling

      Tech Tips

      The waveform varies depending on the suction control valve operation.

  6. Waveform 6


    1. A01CJBGE01

      EGR Valve Assembly Signal

      Terminal No. (Symbols) E23-3 (EGRS) - E23-7 (E1)
      Tool Setting 5 V/DIV., 5 ms./DIV.
      Condition Engine is warmed up, engine speed 1500 rpm

  7. Waveform 7


    1. A01CINQE01

      Injector Injection Confirmation Signal

      Terminal No. (Symbols) E22-25 (INJF) - E23-7 (E1)
      Tool Setting 2 V/DIV., 20 ms./DIV.
      Condition Idling

      Tech Tips

      The waveform varies depending on the injector injection.

  8. Waveform 8


    1. A01CHLDE01

      Throttle Actuator Signal

      Terminal No. (Symbols) E23-4 (LUSL) - E23-7 (E1)
      Tool Setting 1 V/DIV., 2 ms./DIV.
      Condition

      Accelerator pedal released →

      Accelerator pedal depressed

      (when throttle actuator is operating)

      Tech Tips

      The waveform varies depending on the throttle valve operation.

  9. Waveform 9


    1. A01CGTZE03

      CAN Communication Signal

      Terminal No. (Symbols) E24-17 (CANH) - E23-7 (E1)
      Tool Setting 1 V/DIV., 10 μsec./DIV.
      Condition Engine stopped, ignition switch ON

      Tech Tips

      The waveform varies depending on the CAN communication signal.

  10. Waveform 10


    1. A01CIK7E03

      CAN Communication Signal

      Terminal No. (Symbols) E24-28 (CANL) - E23-7 (E1)
      Tool Setting 1 V/DIV., 10 μsec./DIV.
      Condition Engine stopped, ignition switch ON

      Tech Tips

      The waveform varies depending on the CAN communication signal.