ECD SYSTEM TERMINALS OF ECM

A01QOYEE03

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, 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
A62-1 (+B3) - A62-17 (E3) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A62-2 (+B) - A62-17 (E3) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A62-4 (E1) - Body ground W-B - - Ground Always Below 1 Ω
A62-5 (E2) - Body ground W-B - - Ground Always Below 1 Ω
A62-7 (D) - A62-4 (E1) L - 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
A62-9 (MREL) - A62-17 (E3) B - W-B EFI MAIN NO. 1 relay Ignition switch ON 11 to 14 V
45 seconds elapsed since ignition switch off 0 to 1.5 V
A62-10 (ST1-) - A62-4 (E1) GR - 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
A62-11 (R) - A62-4 (E1) R - W-B Back-up light switch signal Back-up light switch ON 11 to 14 V
A62-12 (CANN) - A62-4 (E1) W - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 1)
A62-13 (CANP) - A62-4 (E1) B - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 2)
A62-14 (+B2) - A62-17 (E3) B - W-B Power source of ECM Ignition switch ON 11 to 14 V
A62-15 (BATT) - A62-17 (E3) W - W-B Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V
A62-17 (E3) - Body ground W-B - - Ground Always Below 1 Ω
A62-18 (E4) - Body ground W-B - - Ground Always Below 1 Ω
A62-20 (FANL) - A62-4 (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
A62-21 (TACH) - A62-4 (E1) GR - W-B Engine speed Idling

Pulse generation

(See waveform 3)
A62-25 (CANL) - A62-4 (E1) W - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 4)
A62-26 (CANH) - A62-4 (E1) Y - W-B CAN communication line Ignition switch ON

Pulse generation

(See waveform 5)
A62-27 (VCPA) - A62-22 (EPA) B - W Power source of accelerator pedal sensor assembly (for VPA) Ignition switch ON 4.5 to 5.5 V
A62-29 (VCP2) - A62-23 (EPA2) L - G Power source of accelerator pedal sensor assembly (for VPA2) Ignition switch ON 4.5 to 5.5 V
A62-30 (ELS2) - A62-4 (E1) P - W-B Electric load Defogger switch ON 7.5 to 14 V
Defogger switch off 0 to 1.5 V
A62-32 (MHSW)* - A62-4 (E1) V - W-B Power heater switch signal Power heater switch ON 11 to 14 V
A62-36 (STA) - A62-4 (E1) SB - W-B Starter signal Cranking 6.0 V or higher
A62-37 (IGSW) - A62-17 (E3) B - W-B Ignition switch signal Ignition switch ON 11 to 14 V
A62-43 (VPA2) - A62-23 (EPA2) P - 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
A62-45 (FANH) - A62-4 (E1) W - W-B Cooling fan (high speed) Idling with high engine coolant temperature Below 1.5 V
A62-48 (STP) - A62-4 (E1) L - 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
A62-50 (TC) - A62-4 (E1) G - W-B Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A62-51 (SPD) - A62-4 (E1) V - W-B Speed signal from combination meter Ignition switch ON, drive wheels rotating slowly

Pulse generation

(See waveform 6)
A62-52 (VPA) - A62-22 (EPA) Y - W 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
A62-59 (W) - A62-4 (E1) R - W-B MIL MIL illuminated Below 3 V
MIL not illuminated 11 to 14 V
A62-60 (FC) - A62-4 (E1) W - W-B FUEL PUMP relay Ignition switch ON 11 to 14 V
Idling Below 1.5 V
B112-16 (ECBV) - A62-4 (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
B112-17 (HAF2) - A62-5 (E2) W-G - W-B Air fuel ratio sensor heater (for sensor 2) Ignition switch ON 11 to 14 V
Idling with warm engine

Pulse generation

(See waveform 7)
B112-21 (VN-A) - A62-4 (E1) W-B - W-B VN turbocharger motor Idling with warm engine

Pulse generation

(See waveform 8)
B112-24 (VCPE) - A62-4 (E1) L - W-B Power source of exhaust gas pressure sensor Ignition switch ON 4.5 to 5.5 V
B112-26 (IJ4+) - B112-56 (IJ4-) R-G - BR-G No. 4 injector assembly Idling with warm engine

Pulse generation

(See waveform 9)
B112-27 (IJ3+) - B112-57 (IJ3-) R-Y - BR-Y No. 3 injector assembly Idling with warm engine

Pulse generation

(See waveform 9)
B112-28 (IJ2+) - B112-58 (IJ2-) R-L - BR-L No. 2 injector assembly Idling with warm engine

Pulse generation

(See waveform 9)
B112-29 (IJ1+) - B112-59 (IJ1-) R-W - BR-W No. 1 injector assembly Idling with warm engine

Pulse generation

(See waveform 9)
B112-30 (PCV) - A62-4 (E1) W-V - W-B Fuel quantity control valve Idling with warm engine

Pulse generation

(See waveform 10)
B112-46 (HAF1) - A62-5 (E2) W-Y - W-B Air fuel ratio sensor heater (for sensor 1) Ignition switch ON 11 to 14 V
Idling with warm engine

Pulse generation

(See waveform 7)
B112-48 (EGM+) - B112-18 (EGM-) GR-R - W-Y EGR valve assembly (Motor) Idling with warm engine

Pulse generation

(See waveform 11)
B112-49 (IA1+) - B112-19 (IA1-) W-GR - W-G Swirl control valve (Motor) Idling with warm engine

Pulse generation

(See waveform 12)
B112-50 (M+) - B112-20 (M-) W-R - W-L Diesel throttle duty signal Idling with warm engine

Pulse generation

(See waveform 13)
B112-51 (VN+A) - A62-4 (E1) W - W-B VN turbocharger motor Idling with warm engine

Pulse generation

(See waveform 14)
B112-54 (VCS) - B112-102 (E2S) L-W - BR-GR Power source of fuel pressure sensor Ignition switch ON 4.5 to 5.5 V
B112-60 (PRV) - A62-5 (E2) W-B - W-B Pressure discharge valve Ignition switch ON

Pulse generation

(See waveform 15)
B112-61 (VPIM) - B112-76 (EPIM) L-G - BR-L Power source of turbo pressure sensor assembly Ignition switch ON 4.75 to 5.25 V
B112-65 (VNVC) - B112-112 (VNE2) L-B - BR-O Power source of nozzle vane position sensor Ignition switch ON 4.5 to 5.5 V
B112-68 (G+) - B112-115 (G-) Y-V - BR-Y Camshaft position sensor Idling with warm engine

Pulse generation

(See waveform 16)
B112-69 (VCEG) - B112-84 (EEGL) L - BR-G Power source of EGR valve position sensor Ignition switch ON 4.5 to 5.5 V
B112-70 (VCPX) - B112-71 (EPEX) L-GR - BR-O Power source of differential pressure sensor Ignition switch ON 4.5 to 5.5 V
B112-72 (VAC1) - A62-5 (E2) L-Y - W-B Power source of swirl control valve Ignition switch ON 4.5 to 5.5 V
B112-74 (LIN) - B112-96 (EGCU) V-W - BR-W LIN communication Ignition switch ON

Pulse generation

(See waveform 17)
B112-79 (THIA) - B112-89 (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
B112-80 (VTAI) - B112-112 (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
B112-82 (THW) - B112-113 (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
B112-83 (VCTA) - B112-81 (ETA) L-W - BR-O Power source of diesel throttle position sensor Ignition switch ON 4.5 to 5.5 V
B112-85 (PEX) - B112-71 (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
B112-87 (IAC1) - B112-119 (EAC1) Y - BR-B Swirl control valve (Position sensor) Idling with warm engine 0.5 to 4.5 V
B112-92 (THCI) - B112-91 (ETCI) Y-L - BR-Y Exhaust gas temperature sensor (for sensor 1) Idling with warm engine 2.9 to 3.3 V
B112-93 (THF) - B112-124 (ETHF) L-G - BR-G Fuel temperature sensor Ignition switch ON 0.5 to 2.0 V
B112-97 (VG) - B112-129 (EVG) Y-B - BR-B Mass air flow meter signal Ignition switch ON

Pulse generation

(See waveform 18)
B112-101 (PC) - B112-102 (E2S) Y-GR - BR-GR Fuel pressure sensor Idling 1.0 to 1.3 V
B112-103 (PEXM) - B112-135 (EPEM) Y - BR-O Exhaust gas pressure sensor Ignition switch ON (same as atmosphere pressure) 0.7 to 1.3 V
B112-109 (THCO) - B112-110 (ETCO) GR-W - BR Exhaust gas temperature sensor (for sensor 2) Idling with warm engine 2.9 to 3.3 V
B112-111 (PIM) - B112-76 (EPIM) B-L - BR-L Turbo pressure sensor assembly Ignition switch ON (same as atmosphere pressure) 0.8 to 1.4 V
B112-114 (THA) - B112-129 (EVG) GR-B - BR-B Intake air temperature sensor (built into mass air flow meter sub-assembly) Idling, intake air temperature 20°C (68°F) 0.5 to 2.0 V
B112-116 (EGLS) - B112-84 (EEGL) B - BR-G EGR valve assembly (Position sensor) Idling with warm engine 0.5 to 4.5 V
B112-118 (THEC) - B112-86 (ETEC) Y-L - BR-Y EGR gas temperature sensor Idling with warm engine 0 to 5 V
B112-117 (VTA1) - B112-81 (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
B112-121 (NE+) - B112-90 (NE-) B-R - BR-R Crankshaft position sensor Idling with warm engine

Pulse generation

(See waveform 19)
B112-122 (VCNE) - B112-90 (NE-) L-R - BR-R Power source of crankshaft position sensor Ignition switch ON 4.5 to 5.5 V
B112-125 (RE1) - A62-5 (E2) B-Y - W-B Air fuel ratio sensor signal (for sensor 1) Idling with warm engine 2.1 to 3.5 V
B112-126 (AF1-) - A62-5 (E2) BR - W-B Air fuel ratio sensor signal (for sensor 1) Idling with warm engine 2.35 to 2.65 V
B112-127 (AF1+) - A62-5 (E2) GR-BR - W-B Air fuel ratio sensor signal (for sensor 1) Idling with warm engine 1.5 to 4.9 V
B112-128 (TR1) - A62-5 (E2) GR-L - W-B Air fuel ratio sensor signal (for sensor 1) Idling with warm engine 1.5 to 4.9 V
B112-131 (TR2) - A62-5 (E2) GR-W - W-B Air fuel ratio sensor signal (for sensor 2) Idling with warm engine 1.5 to 4.9 V
B112-130 (AF2+) - A62-5 (E2) GR - W-B Air fuel ratio sensor signal (for sensor 2) Idling with warm engine 1.5 to 4.9 V
B112-133 (AF2-) - A62-5 (E2) BR-R - W-B Air fuel ratio sensor signal (for sensor 2) Idling with warm engine 2.35 to 2.65 V
B112-134 (RE2) - A62-5 (E2) B-W - W-B Air fuel ratio sensor signal (for sensor 2) Idling with warm engine 2.1 to 3.5 V
*: w/ Power Heater (Combination Type)

  1. WAVEFORM 1

    A01QRJUE01
    *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

  2. WAVEFORM 2

    A01QQA4E01
    *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

  3. WAVEFORM 3

    A01QO9ME01
    *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

  4. WAVEFORM 4

    A01QOWME01
    *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

  5. WAVEFORM 5

    A01QTELE01
    *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

  6. WAVEFORM 6

    A01QTU5E01
    *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.

  7. WAVEFORM 7

    A01QT9JE01
    *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

  8. WAVEFORM 8

    A01QR09E01
    *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

  9. WAVEFORM 9

    A01QTGDE01
    *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

  10. WAVEFORM 10

    A01QP8VE01
    *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

  11. WAVEFORM 11

    A01QQE7E01
    *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

  12. WAVEFORM 12

    A01QQVRE01
    *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

  13. WAVEFORM 13

    A01QQINE01
    *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

  14. WAVEFORM 14

    A01QSRRE01
    *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

  15. WAVEFORM 15

    A01QSW3E01
    *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

  16. WAVEFORM 16

    A01QOKDE01
    *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

  17. WAVEFORM 17

    A01QQ8IE01
    *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

  18. WAVEFORM 18

    A01QRQPE01
    *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

  19. WAVEFORM 19

    A01QRYSE01
    *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