ECD SYSTEM TERMINALS OF ECM

A004OL1E04

Tech Tips


  • The standard voltage between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals are also indicated.

  • The result of checks should be compared with the standard voltage for that pair of terminals, and 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
A83-2 (+B) - A83-17 (E3) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A83-14 (+B2) - A83-17 (E3) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A83-1 (+B3) - A83-17 (E3) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A83-9 (MREL) - A83-17 (E3) W - W-B EFI MAIN relay Ignition switch ON 11 to 14 V
45 seconds elapsed since ignition switch off 0 to 1.5 V
A83-15 (BATT) - A83-17 (E3) B - W-B Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
A83-37 (IGSW) - A83-17 (E3) B - W-B Ignition switch signal Ignition switch ON 11 to 14 V
A83-52 (VPA) - A83-22 (EPA) W - R 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
A83-43 (VPA2) - A83-23 (EPA2) Y - G 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
A83-27 (VCPA) - A83-22 (EPA) L - R Power source of accelerator pedal sensor assembly (for VPA) Ignition switch ON 4.5 to 5.5 V
A83-29 (VCP2) - A83-23 (EPA2) LG - G Power source of accelerator pedal sensor assembly (for VPA2) Ignition switch ON 4.5 to 5.5 V
B91-83 (VCTA) - B91-81 (ETA) L-W - BR-O Power source of diesel throttle position sensor Ignition switch ON 4.5 to 5.5 V
B91-117 (VTA1) - B91-81 (ETA) GR-W - BR-O Diesel throttle position sensor Throttle valve fully opened 3.2 to 4.9 V
Throttle valve fully closed 0.5 to 1.1 V
B91-50 (M+) - B91-20 (M-) W-R - W-L Diesel throttle duty signal Idling with warm engine

Pulse generation

(See waveform 1)
B91-46 (HAF1) - A83-5 (E2) W-Y - W-B Air fuel ratio sensor heater (for sensor 1) Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 2)
B91-127 (AF1+) - A83-5 (E2) GR-BR - W-B Air fuel ratio sensor signal (for sensor 1) Idling with warm engine 1.5 to 4.9 V
B91-126 (AF1-) - A83-5 (E2) BR - W-B Air fuel ratio sensor signal (for sensor 1) Idling with warm engine 2.35 to 2.65 V
B91-128 (TR1) - A83-5 (E2) GR-L - W-B Air fuel ratio sensor signal (for sensor 1) Idling with warm engine 1.5 to 4.9 V
B91-125 (RE1) - A83-5 (E2) B-Y - W-B Air fuel ratio sensor signal (for sensor 1) Idling with warm engine 2.1 to 3.5 V
B91-93 (THF) - B91-124 (ETHF) L-G - BR-G Fuel temperature sensor Ignition switch ON 0.5 to 2.0 V
B91-54 (VCS) - B91-102 (E2S) L-W - BR-GR Power source of fuel pressure sensor Ignition switch ON 4.5 to 5.5 V
B91-101 (PC) - B91-102 (E2S) Y-GR - BR-GR Fuel pressure sensor Idling 1.0 to 1.3 V
B91-97 (VG) - B91-129 (EVG) Y-B - BR-B Mass air flow meter signal Ignition switch ON

Pulse generation

(See waveform 3)
B91-114 (THA) - B91-129 (EVG) GR-B - BR-B Intake air temperature sensor (built into mass air flow meter) Idling, intake air temperature 20°C (68°F) 0.5 to 2.0 V
B91-30 (PCV) - A83-4 (E1) W-V - W-B Fuel quantity control valve Idling

Pulse generation

(See waveform 4)
B91-29 (IJ1+) - B91-59 (IJ1-) R-W - BR-W No. 1 injector assembly Idling

Pulse generation

(See waveform 5)
B91-28 (IJ2+) - B91-58 (IJ2-) R-L - BR-L No. 2 injector assembly Idling

Pulse generation

(See waveform 5)
B91-27 (IJ3+) - B91-57 (IJ3-) R-Y - BR-Y No. 3 injector assembly Idling

Pulse generation

(See waveform 5)
B91-26 (IJ4+) - B91-56 (IJ4-) R-G - BR-G No. 4 injector assembly Idling

Pulse generation

(See waveform 5)
B91-92 (THCI) - B91-91 (ETCI) Y-L - BR-Y Exhaust gas temperature sensor (for sensor 1) Idling with warm engine 2.9 to 3.3 V
B91-109 (THCO) - B91-110 (ETCO) GR-W - BR Exhaust gas temperature sensor (for sensor 2) Idling with warm engine 2.9 to 3.3 V
B91-82 (THW) - B91-113 (ETHW) B-V - BR-B Engine coolant temperature sensor Idling, engine coolant temperature 60 to 120°C (140 to 248°F) 0.2 to 1.0 V
B91-79 (THIA) - B91-89 (ETHI) B-W - BR-W Intake air temperature sensor Idling, intake air temperature at 0 to 80°C (32 to 176°F) 0.5 to 2.0 V
B91-61 (VPIM) - B91-76 (EPIM) L-G - BR-L Power source of turbo pressure sensor assembly Ignition switch ON 4.75 to 5.25 V
B91-111 (PIM) - B91-76 (EPIM) B-L - BR-L Turbo pressure sensor assembly Ignition switch ON (same as atmosphere pressure) 0.8 to 1.4 V
B91-65 (VNVC) - B91-112 (VNE2) L-B - BR-O Power source of nozzle vane position sensor Ignition switch ON 4.5 to 5.5 V
B91-80 (VTAI) - B91-112 (VNE2) GR-W - BR-O Nozzle vane position sensor VN turbocharger fully closed 0.9 to 2.1 V
VN turbocharger fully opened 3.0 to 4.1 V
B91-51 (VN+A) - A83-4 (E1) W - W-B VN turbocharger motor Idling with warm engine

Pulse generation

(See waveform 6)
B91-21 (VN-A) - A83-4 (E1) W-B - W-B VN turbocharger motor Idling with warm engine

Pulse generation

(See waveform 7)
B91-16 (ECBV) - A83-4 (E1) W-R - W-B EGR cooler bypass switching valve assembly Ignition switch ON with cold engine 0 to 1.5 V
Idling with warm engine 11 to 14 V
B91-69 (VCEG) - B91-84 (EEGL) L - BR-G Power source of EGR valve position sensor Ignition switch ON 4.5 to 5.5 V
B91-70 (VCPX) - B91-71 (EPEX) L-GR - BR-O Power source of differential pressure sensor Ignition switch ON 4.5 to 5.5 V
A83-36 (STA) - A83-4 (E1) LG - W-B Starter signal Cranking 6.0 V or higher
A83-21 (TACH) - A83-4 (E1) GR - W-B Engine speed Idling

Pulse generation

(See waveform 8)
A83-48 (STP) - A83-4 (E1) V - W-B Stop light switch assembly Ignition switch ON, brake pedal depressed 7.5 to 14 V
Ignition switch ON, brake pedal released 0 to 1.5 V
A83-10 (ST1-) - A83-4 (E1) R-W - W-B

Stop light switch assembly

(opposite to STP)

 Ignition switch ON, brake pedal depressed 0 to 1.5 V
Ignition switch ON, brake pedal released 7.5 to 14 V
A83-51 (SPD) - A83-4 (E1) Y - W-B Speed signal from combination meter Ignition switch ON, drive wheels rotating slowly

Pulse generation

(See waveform 9)
A83-59 (W) - A83-4 (E1) P - W-B MIL MIL illuminated Below 3 V
MIL not illuminated 11 to 14 V
A83-50 (TC) - A83-4 (E1) P - W-B Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A83-20 (FANL) - A83-4 (E1) R - W-B Cooling fan (low speed) Ignition switch ON 11 to 14 V
Idling with A/C on or high engine coolant temperature Below 1.5 V
A83-45 (FANH) - A83-4 (E1) W - W-B Cooling fan (high speed) Idling with high engine coolant temperature Below 1.5 V
A83-30 (ELS2) - A83-4 (E1) B - W-B Electric load Defogger switch ON 7.5 to 14 V
Defogger switch off 0 to 1.5 V
A83-32 (MHSW) - A83-4 (E1) R - W-B Power heater switch signal Power heater switch ON 11 to 14 V
A83-11 (R) - A83-4 (E1) R - W-B Back-up light switch signal Back-up light switch ON 11 to 14 V
A83-26 (CANH) - A83-4 (E1) Y - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 10)
A83-25 (CANL) - A83-4 (E1) W - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 11)
A83-13 (CANP) - A83-4 (E1) R - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 12)
A83-12 (CANN) - A83-4 (E1) W - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 13)
B91-121 (NE+) - B91-90 (NE-) B-R - BR-R Crankshaft position sensor Idling with warm engine

Pulse generation

(See waveform 14)
B91-68 (G+) - B91-115 (G-) Y-V - BR-Y Camshaft position sensor Idling with warm engine

Pulse generation

(See waveform 15)
A83-60 (FC) - A83-4 (E1) B - W-B FUEL PUMP relay Ignition switch ON 11 to 14 V
Idling Below 1.5 V
B91-74 (LIN) - B91-96 (EGCU) V-W - BR-W LIN communication Ignition switch ON

Pulse generation

(See waveform 16)
B91-85 (PEX) - B91-71 (EPEX) B - BR-O Differential pressure sensor Ignition switch ON 0.7 to 1.3 V
Idling with warm engine 0.5 to 4.5 V
B91-24 (VCPE) - A83-4 (E1) L - W-B Power source of exhaust gas pressure sensor Ignition switch ON 4.5 to 5.5 V
B91-103 (PEXM) - B91-135 (EPEM) Y - BR-O Exhaust gas pressure sensor Ignition switch ON (same as atmosphere pressure) 0.7 to 1.3 V
B91-60 (PRV) - A83-5 (E2) W-B - W-B Pressure discharge valve Ignition switch ON

Pulse generation

(See waveform 17)
B91-130 (AF2+) - A83-5 (E2) GR - W-B Air fuel ratio sensor signal (for sensor 2) Idling with warm engine 1.5 to 4.9 V
B91-133 (AF2-) - A83-5 (E2) BR-R - W-B Air fuel ratio sensor signal (for sensor 2) Idling with warm engine 2.35 to 2.65 V
B91-131 (TR2) - A83-5 (E2) GR-W - W-B Air fuel ratio sensor signal (for sensor 2) Idling with warm engine 1.5 to 4.9 V
B91-134 (RE2) - A83-5 (E2) B-W - W-B Air fuel ratio sensor signal (for sensor 2) Idling with warm engine 2.1 to 3.5 V
B91-17 (HAF2) - A83-4 (E1) W-G - W-B Air fuel ratio sensor heater (for sensor 2) Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 2)
B91-48 (EGM+) - B91-18 (EGM-) GR-R - W-Y EGR valve assembly (Motor) Idling with warm engine

Pulse generation

(See waveform 18)
B91-116 (EGLS) - B91-84 (EEGL) B - BR-G EGR valve assembly (Position sensor) Idling with warm engine 0.5 to 4.5 V
B91-72 (VAC1) - A83-5 (E2) L-Y -W-B Power source of swirl control valve Ignition switch ON 4.5 to 5.5 V
B91-87 (IAC1) - B91-119 (EAC1) Y -BR-B Swirl control valve (Position sensor) Idling with warm engine 0.5 to 4.5 V
B91-49 (IA1+) - B91-19 (IA1-) W-GR - W-G Swirl control valve (Motor) Idling with warm engine

Pulse generation

(See waveform 19)
B91-118 (THEC) - B91-86 (ETEC) Y-L - BR-Y EGR gas temperature sensor Idling with warm engine 0 to 5 V
A83-4 (E1) - Body ground W-B - - Ground Always Below 1 Ω
A83-5 (E2) - Body ground W-B - - Ground Always Below 1 Ω
A83-17 (E3) - Body ground W-B - - Ground Always Below 1 Ω
A83-18 (E4) - Body ground W-B - - Ground Always Below 1 Ω

  1. WAVEFORM 1

    A004O0DE01
    *a 5 V/DIV.
    *b 200 μs./DIV.
    Diesel throttle duty signal
    Item Content
    ECM Terminal Name Between M+ and M-
    Tester Range 5 V/DIV., 200 μs./DIV.
    Condition Idling with warm engine

  2. WAVEFORM 2

    A004S7XE01
    *a 5 V/DIV.
    *b 5 ms./DIV.
    Air fuel ratio sensor heater signal
    Item Content
    ECM Terminal Name

    Between HAF1 and E2

    Between HAF2 and E2
    Tester Range 5 V/DIV., 5 ms./DIV.
    Condition Idling with warm engine

  3. WAVEFORM 3

    A004QE1E01
    *a 1 V/DIV.
    *b 200 μs./DIV.
    Mass air flow meter signal
    Item Content
    ECM Terminal Name Between VG and EVG
    Tester Range 1 V/DIV., 200 μs./DIV.
    Condition Ignition switch ON

  4. WAVEFORM 4

    A004RFQE01
    *a 5 V/DIV.
    *b 2 ms./DIV.
    Fuel quantity control valve signal
    Item Content
    ECM Terminal Name Between PCV and E1
    Tester Range 5 V/DIV., 2 ms./DIV.
    Condition Idling with warm engine

  5. WAVEFORM 5

    A004R0WE01
    *1 15 V/DIV.
    *2 200 μs./DIV.
    Injector signal
    Item Content
    ECM Terminal Name

    Between IJ1+ and IJ1-

    Between IJ2+ and IJ2-

    Between IJ3+ and IJ3-

    Between IJ4+ and IJ4-
    Tester Range 15 V/DIV., 200 μs./DIV.
    Condition Idling with warm engine

  6. WAVEFORM 6

    A004RC8E01
    *a 5 V/DIV.
    *b 200 μs./DIV.
    VN turbocharger motor signal
    Item Content
    ECM Terminal Name Between VN+A and E1
    Tester Range 5 V/DIV., 200 μs./DIV.
    Condition Idling with warm engine

  7. WAVEFORM 7

    A004MZ2E01
    *a 5 V/DIV.
    *b 200 μs./DIV.
    VN turbocharger motor signal
    Item Content
    ECM Terminal Name Between VN-A and E1
    Tester Range 5 V/DIV., 200 μs./DIV.
    Condition Idling with warm engine

  8. WAVEFORM 8

    A004PJDE01
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Engine speed signal
    Item Content
    ECM Terminal Name Between TACH and E1
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

  9. WAVEFORM 9

    A004QHYE02
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Vehicle speed signal
    Item Content
    ECM Terminal Name Between SPD and E1
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Ignition switch ON, drive wheels rotating slowly

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  10. WAVEFORM 10

    A004SNRE01
    *a 1 V/DIV.
    *b 50 μs./DIV.
    CAN communication signal
    Item Content
    ECM Terminal Name Between CANH and E1
    Tester Range 1 V/DIV., 50 μs./DIV.
    Condition Ignition switch ON

  11. WAVEFORM 11

    A004RSEE01
    *a 1 V/DIV.
    *b 50 μs./DIV.
    CAN communication signal
    Item Content
    ECM Terminal Name Between CANL and E1
    Tester Range 1 V/DIV., 50 μs./DIV.
    Condition Ignition switch ON

  12. WAVEFORM 12

    A004P3OE01
    *a 1 V/DIV.
    *b 20 μs./DIV.
    CAN communication signal
    Item Content
    ECM Terminal Name Between CANP and E1
    Tester Range 1 V/DIV., 20 μs./DIV.
    Condition Ignition switch ON

  13. WAVEFORM 13

    A004OY5E01
    *a 1 V/DIV.
    *b 20 μs./DIV.
    CAN communication signal
    Item Content
    ECM Terminal Name Between CANN and E1
    Tester Range 1 V/DIV., 20 μs./DIV.
    Condition Ignition switch ON

  14. WAVEFORM 14

    A004MQ9E01
    *a 2 V/DIV.
    *b 10 ms./DIV.
    Crankshaft position sensor signal
    Item Content
    ECM Terminal Name Between NE+ and NE-
    Tester Range 2 V/DIV., 10 ms./DIV.
    Condition Idling with warm engine

  15. WAVEFORM 15

    A004PH2E01
    *a 1 V/DIV.
    *b 20 ms./DIV.
    Camshaft position sensor signal
    Item Content
    ECM Terminal Name Between G+ and G-
    Tester Range 1 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

  16. WAVEFORM 16

    A004TB1E01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    LIN communication signal
    Item Content
    ECM Terminal Name Between LIN and EGCU
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Ignition switch ON

  17. WAVEFORM 17

    A004QHVE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Pressure discharge valve signal
    Item Content
    ECM Terminal Name Between PRV and E2
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Ignition switch ON

  18. WAVEFORM 18

    A004Q4QE01
    *a 5 V/DIV.
    *b 200 μs./DIV.
    EGR valve motor signal
    Item Content
    ECM Terminal Name Between EGM+ and EGM-
    Tester Range 5 V/DIV., 200 μs./DIV.
    Condition Idling with warm engine

  19. WAVEFORM 19

    A004TCGE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Swirl control valve motor signal
    Item Content
    ECM Terminal Name Between IA1+ and IA1-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling with warm engine