ECD SYSTEM TERMINALS OF ECM

A01BF9TE01

Tech Tips

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

In the table, first follow the information under "Condition". Look under "Symbols (Terminal No.)" for the terminals to be inspected. The standard normal voltage between the terminals is shown under "STD Voltage". Use the illustration above as a reference for the ECM terminals.

Symbols (Terminal No.) Wiring Color Terminal Description Condition STD Voltage
BATT (B10-1) - E1 (D2-14) B-R - BR Battery (for measuring the battery voltage and for the ECM memory) Always 9 to 14 V
SREL (B10-2) - E01 (D2-13) G - BR Glow plug relay Cranking 9 to 14 V
SREL (B10-2) - E01 (D2-13) G - BR Glow plug relay

Idling

(engine start and after 600 sec.)

0 to 1.5 V
MREL (B10-3) - E1 (D2-14) G-Y - BR EFI relay IG switch ON 9 to 14 V
MREL (B10-3) - E1 (D2-14) G-Y - BR EFI relay

IG switch OFF

(after IG switch OFF for 2 sec.)

0 to 1.5 V
TC (B10-4) - E1 (D2-14) P - BR Terminal TC of DLC3 IG switch ON 9 to 14 V
W (B10-5) - E1 (D2 -14) G-R - BR MIL Check engine warning light lights up 0 to 3 V
W (B10-5) - E1 (D2-14) G-R - BR MIL Except check engine warning light lights up 9 to 14 V
RFC (B10-7) - E1 (D2-14) LG-B - BR Cooling fan ECU IG switch ON or fan is rotating

Pulse generation

(See waveform 1)

THWO (B10-8) - E1 (D2-14) Y - BR Combination meter IG switch ON

Pulse generation

(See waveform 2)

SPD (B10-9) - E1 (D2-14) P-L- BR Speed signal from combination meter IG switch ON, Rotate driving wheel slowly

Pulse generation

(See waveform 3)

STA (B10 -11) - E1 (D2-14) R - BR Starter signal Cranking 6 V or more
+B (B10 -12) - E1 (D2-14) B-R - BR Power source of ECM IG switch ON 9 to 14 V
FAN (B10-13) - E1 (D2-14) W-L - BR Fan relay Sub fan is rotating 0 to 3 V
FAN (B10-13) - E1 (D2-14) W-L - BR Fan relay Sub fan is not rotating 9 to 14 V
IGSW (B10-14) - E1 (D2-14) B-R - BR Engine switch IG switch ON 9 to 14 V
SIL (B10-15) - E1 (D2-14) W - BR Terminal SIL of DLC3 Connect intelligent tester to DLC3 Pulse generation
STP (B10-19) - E1 (D2-14) R-W - BR Stop light switch Brake pedal depressed 9 to 14 V
STP (B10-19) - E1 (D2-14) R-W - BR Stop light switch Brake pedal released Below 1.5 V
HSW (B10-20) - E1 (D2-14) L-W - BR Idle up switch Idle up switch ON Below 2.5 V
HSW (B10-20) - E1 (D2-14) L-W - BR Idle up switch Idle up switch OFF 9 to 14 V
ALT (B10-22) - E1 (D2-14) W - BR Generator (alternator) duty ratio Idling

Pulse generation

(See waveform 4)

GIND (B8-1) - E1 (D2-14) B-W - BR Glow indicator light Glow indicator light lights up 0 to 3 V
GIND (B8-1) - E1 (D2-14) B-W - BR Glow indicator light Except glow indicator light lights up 9 to 14 V
AC1 (B8-2) - E1 (D2-14) R-B - BR A/C amplifier

A/C switch ON

(at magnet clutch ON)

Below 1.5 V
AC1 (B8-2) - E1 (D2-14) R-B - BR A/C amplifier A/C switch OFF 7.5 to 14 V
VPA (B8-5) - EPA (B8-4) L - W-L

Accelerator pedal position sensor

(for engine control)

IG switch ON, accelerator pedal released 0.5 to 1.1 V
VPA (B8-5) - EPA (B8-4) L - W-L

Accelerator pedal position sensor

(for engine control)

IG switch ON, accelerator pedal depressed 2.6 to 4.5 V
VCPA (B8-6) - EPA (B8-4) W - W-L

Power source of accelerator pedal position sensor

(for VPA)

IG switch ON 4.5 to 5.5 V
TACH (B8-7) - E1 (D2-14) B-Y - BR Engine speed Idling

Pulse generation

(See waveform 5)

ACT (B8-8) - E1 (D2-14) G-W - BR A/C amplifier IG switch ON 9 to 14 V
ACT (B8-8) - E1 (D2-14) G-W - BR A/C amplifier At A/C cut controlled (Driving below 30 km/h (18.6 mph), accelerator pedal fully depressed for 5 sec.) 0 to 3 V
ST1 - (B8-11) - E1 (D2-14) R-L - BR Stop light switch Brake pedal depressed Below 1.5 V
ST1 - (B8-11) - E1 (D2-14) R-L - BR Stop light switch Brake pedal released 9 to 14 V
VPA2 (B8-12) - EPA (B8-4) B - W-L Accelerator pedal position sensor (for sensor malfunction detection) IG switch ON, accelerator pedal released 1.2 to 2.0 V
VPA2 (B8-12) - EPA (B8-4) B - W-L Accelerator pedal position sensor (for sensor malfunction detection) IG switch ON, accelerator pedal depressed 3.4 to 5.3 V
VC (D4-1) - E2 (D4-9) L-B - Y-R Power source of sensor (a specific voltage) IG switch ON 4.5 to 5.5 V
PIM (D4-2) - E2 (D4-9) P - Y-R Pressure sensor

Apply vacuum 60 kPa

(450 mmHg, 17.7 in.Hg)

0.2 to 0.8 V
PIM (D4-2) - E2 (D4-9) P - Y-R Pressure sensor

Apply vacuum 207 kPa

(1,550 mmHg, 61.0 in.Hg)

4.2 to 4.8 V
THA (D4-3) - E2 (D4-9) R-L - Y-R Intake air temperature sensor Idling, air intake temp. 0°C (32°F) to 80°C (176°F) 0.5 to 3.4 V
THW (D4-4) - E2 (D4-9) R-W - Y-R Engine coolant temperature sensor Idling, engine coolant temp. 60°C (140°F) to 120°C (248°F) 0.2 to 1.0 V
THF (D4-5) - E2 (D4-9) R - Y-R Fuel temperature sensor IG switch ON (at engine cold) 0.5 to 3.4 V
DATA (D4-6) - E1 (D2-14) Y - BR Injection pump For 0.5 sec. after IG switch ON Pulse generation
PR2 (D4-8) - E1 (D2-14) Y-G - BR Pressure switch Pressure switch ON (A/C pressure is normal) Below 1.5 V
PR2 (D4-8) - E1 (D2-14) Y-G - BR Pressure switch Pressure switch OFF (A/C pressure is low) 9 to 14 V
RTHW (D4-12) - E2 (D4-9) L-R - Y-R Radiator side engine coolant temperature sensor Idling, radiator side engine coolant temp. 60°C (140°F) to 120°C (248°F) 0.2 to 1.0 V
CLK (D4-14) - E1 (D2-14) L - Y-R Injection pump For 0.5 sec. after IG switch ON Pulse generation
THOP (D4-15) - E1 (D2-14) L - BR Intake shutter fully opened switch Idling (engine warmed up) 9 to 14 V
THOP (D4-15) - E1 (D2-14) L - BR Intake shutter fully opened switch IG switch ON (once within 5 sec.) 0 to 3 V
LU-B (D2-7) - E01 (D2-13) G - BR

Intake restrictor valve control motor

(Intake shutter)

Racing (engine warmed up)

Pulse generation

(See waveform 6)

LU+B (D2-8) - E01 (D2-13) R - BR

Intake restrictor valve control motor

(Intake shutter)

Racing (engine warmed up)

Pulse generation

(See waveform 6)

LU-A (D2-9) - E01 (D2-13) W - BR

Intake restrictor valve control motor

(Intake shutter)

Racing (engine warmed up)

Pulse generation

(See waveform 6)

LU+A (D2-10) - E01 (D2-13) B - BR

Intake restrictor valve control motor

(Intake shutter)

Racing (engine warmed up)

Pulse generation

(See waveform 6)

TCV (D2-11) - E01 (D2-13) B-W - BR Timing control valve IG switch ON 9 to 14 V
TCV (D2-11) - E01 (D2-13) B-W - BR Timing control valve Idling

Pulse generation

(See waveform 7)

SPV+ (D2-12) - E1 (D2-14) B - BR Spill control valve IG switch ON 9 to 14 V
SPV+ (D2-12) - E1 (D2-14) B - BR Spill control valve Idling Pulse generation
TDC+ (D2-17) - TDC- (D2-16) R - G Crankshaft position sensor Idling

Pulse generation

(See waveform 8)

NE+ (D2-19) - NE- (D2-18) Y - L Engine speed sensor Idling

Pulse generation

(See waveform 8)

SPV- (D2-25) - E1 (D2-14) B-L - BR Spill control valve Idling

Pulse generation

(See waveform 9)


  1. Waveform 1 (Reference):


    1. A01BCWME01

      Cooling fan signal.

      Terminal RFC - E1
      Tool Setting 1 V/DIV., 2 ms/DIV.
      Condition When fan operating

      Tech Tips

      Waveform time A changes according to coolant temperature.

  2. Waveform 2 (Reference):


    1. A01BE5FE01

      A/C amplifier signal.

      Terminal THWO - E1
      Tool Setting 5 V/DIV., 0.1 s/DIV.
      Condition During idling

      Tech Tips

      Waveform time A changes according to coolant temperature.

  3. Waveform 3 (Reference):


    1. A01BI1NE01

      Speed signal.

      Terminal SPD - E1
      Tool Setting 2 V/DIV., 20 ms/DIV.
      Condition When driving at approx. 20 km/h (12.4 mph).

      Tech Tips


      • As vehicle speed increases, the waveform becomes shorter.

      • As vehicle speed increases, the waveforms amplitude become greater.

  4. Waveform 4 (Reference):


    1. A01BD3QE01

      Generator signal.

      Terminal ALT - E1
      Tool Setting 5 V/DIV., 5 ms/DIV.
      Condition During idling
  5. Waveform 5 (Reference):


    1. A01BH0UE01

      Engine speed signal.

      Terminal TACH - E1
      Tool Setting 5 V/DIV., 20 ms/DIV.
      Condition
      1. After warming up

      2. During idling

      Tech Tips

      As engine speed increases, the waveform becomes shorter.

  6. Waveform 6 (Reference):


    1. A01BAV1E01

      Intake restrictor valve control motor signal.

      Terminal LU+A, LU-A, LU+B, LU-B - E01
      Tool Setting 10 V/DIV., 0.5 ms/DIV.
      Condition During engine racing
  7. Waveform 7 (Reference):


    1. A01BF18E01

      Timing control value signal.

      Terminal TCV - E01
      Tool Setting 10 V/DIV., 10 ms/DIV.
      Condition During idling
  8. Waveform 8 (Reference):


    1. A01BE3XE01

      Crankshaft position sensor signal.

      Terminal

      TDC+ - TDC-

      NE+ - NE-

      Tool Setting 2 V/DIV., 20 ms/DIV.
      Condition During idling
  9. Waveform 9 (Reference):


    1. A01BE8OE01

      Spill control valve signal.

      Terminal SPV- - E1
      Tool Setting 20 V/DIV., 10 ms/DIV.
      Condition During idling