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ECM Terminal Arrangement

G12586112Courtesy of SUBARU OF AMERICA, INC.
NOTE: The standard voltages specified for ECM terminals are listed below. Appropriate conditions required for inspection of each terminal are also described. Compare the inspection result with the value in "Standard value." Refer to the figure shown above, and locate the position of the ECM terminal.
Terminal No. (symbol) Terminal description Inspection conditions Standard value
A33-1 (+B2) - A36-4 (E01) ECM power supply IG ON 12 to 14 V
A33-2 (BATT) - A36-4 (E01) Battery (Prepared for battery voltage measurement, and for ECM memory) Always 10 to 13 V
A33-3 (ST1-) - A36-4 (E01) Stop light switch Brake pedal is depressed 11 to 14 V
Brake pedal is released 0 to 1 V
A33-7 (STP) - A36-4 (E01)(1) Stop light switch Brake pedal is depressed 0 to 1 V
Brake pedal is released 11 to 14 V
A33-8 (ACP) - A36-4 (E01) Air conditioner pressure sensor IG ON, A/C ON 0 to 1 V
Idling, A/C OFF 12 to 14 V
A33-12 (THA) - A36-29 (E1) Intake air temperature sensor (Integrated into the intake air flow meter SUB-ASSY) IG ON 0.3 to 4.6 V
A33-14 (STSW2) - A36-4 (E01)(3) Starter signal IG ON 0 to 1 V
Cranking 6 to 13 V
A33-15 (CLSW) - A36-4 (E01)(2) Clutch switch IG ON, clutch pedal depressed 0 to 1 V
IG ON, clutch pedal depressed 10 to 13 V
A33-16 (NSW) - A36-4 (E01) Neutral switch signal With IG ON, the shift lever is at P or N position. (1)
With IG ON, the shift lever is at N position. (2)		 0 to 1 V
With IG ON, the shift lever is except at P or N position. (1)
With IG ON, the shift lever is except at N position. (2)		 10 to 13 V
A33-17 (STSW2) - A36-4 (E01) Starter signal (3)(4) IG ON 0 to 1 V
Cranking (3) More than 6 V
Cranking (4) 6 to 13 V
A33-18 (CANL) - A36-4 (E01) CAN communication line IG ON Pulse generation (Refer to waveform 1.)
A33-19 (CANH) - A36-4 (E01) CAN communication line IG ON Pulse generation (Refer to waveform 2.)
A33-20 (HB) - A36-4 (E01)(9) Blower relay With IG ON, the blower fan switch is turned to ON. 0 to 1 V
With IG ON, the blower fan switch is turned to OFF. 10 to 13 V
A33-22 (VG) - A33-29 (E2G) Intake air flow meter SUB-ASSY Idling, warm-up operation of engine 0.9 to 4.5 V
A33-27 (IGSW) - A36-4 (E01) IG2 relay IG ON 10 to 13 V
A34-5 (HA1A) - A36-4 (E01) Air/fuel ratio sensor (bank 1 sensor 1) heater Idling, cool-down operation of engine Pulse generation (Refer to waveform 3.)
A34-6 (+B) - A36-4 (E01) ECM power supply IG ON 12 to 14 V
A34-9 (FUEL P1) - A36-29 (E1) Fuel pressure sensor Idling, warm-up operation of engine 1.0 to 1.7 V
A34-7 (FUEL P2) -A36-29 (E1) Fuel pressure sensor (sub) Idling, warm-up operation of engine  
A34-11 (IJF1) - A36-4 (E01) Confirmation signal for direct injection of injector Idling Pulse generation (Refer to waveform 4.)
A34-13 (FPF) - A36-4 (E01) High pressure side fuel pump (spill valve) Idling Pulse generation (Refer to waveform 5.)
A34-14 (EV1+) - A36-4 (E01) Variable valve timing (VVT) sensor (exhaust side (bank 1)) Idling, warm-up operation of engine Pulse generation (Refer to waveform 6.)
A34-15 (W2+) - A36-4 (E01) Variable valve timing (VVT) sensor (intake side (bank 2)) Idling, warm-up operation of engine Pulse generation (Refer to waveform 7.)
A34-16 (NE+) - A34-27 (NE-) Crankshaft position sensor Idling, warm-up operation of engine Pulse generation (Refer to waveform 6 or 7.)
A34-17 (KNK2) - A36-29 (E1) Knock control sensor IG ON Approx. 2.5 V
A34-18 (A1A-) - A36-4 (E01) Air/fuel ratio sensor IG ON 2.4 to 2.7 V
A34-19 (A1A+) - A36-4 (E01) Air/fuel ratio sensor IG ON 2.8 to 3.2 V
A34-20 (PIM) - A36-29 (E1) Intake manifold pressure sensor Idling, warm-up operation of engine 1.1 to 2.0 V
A34-21 (OX1B) - A34-8 (E01) Oxygen sensor Idling, warm-up operation of engine 0 to 0.9 V
A34-25 (EV2+) - A36-4 (E01) Variable valve timing (VVT) sensor (exhaust side (bank 2)) Idling, warm-up operation of engine Pulse generation (Refer to waveform 6.)
A34-26 (W1+) - A36-4 (E01) Variable valve timing (VVT) sensor (intake side (bank 1)) Idling, warm-up operation of engine Pulse generation (Refer to waveform 7.)
A34-28 (KNK1) - A36-29 (E1) Knock control sensor IG ON Approx. 2.5 V
A34-31 (IJF2) - A36-4 (E01) Confirmation signal for direct injection of injector Idling Pulse generation (Refer to waveform 4.)
A34-32 (FPD) - A36-4 (E01) High pressure side fuel pump (spill valve) Idling Pulse generation (Refer to waveform 5.)
A34-34 (VCV) - A36-4 (E01) Camshaft timing oil control valve (OCV) ground IG ON 0 to 1 V
A35-1 (VPMP) - A36-4 (E01) Vent valve (integrated into canister pump module) IG ON 10 to 13 V
A35-5 (IREL) - A36-4 (E01) IINJ relay Idling 10 to 13 V
IG ON 0 to 1 V
A35-7 (+BM) - A36-4 (E01) ETCS relay IG ON 10 to 13 V
A35-8 (MPMP) - A36-4 (E01) Leak detection pump (integrated into canister pump module) IG ON 10 to 13 V
Leak detection pump ON 0 to 1 V
A35-10 (DI) - A36-4 (E01) Fuel pump control (Detects malfunction in fuel pump control.) IG ON 10 to 12 V
A35-11 (FAN1) - A36-4 (E01) Fan No. 3 relay (5)
Fan No. 1 relay (6)		 IG ON Cooling fan is not operating. 10 to 13 V
Cooling fan operates at idling speed, A/C ON or high engine coolant temperature. (5) 0 to 0.5 V
Cooling fan operates at high engine coolant temperature. (6) 0 to 0.5 V
A35-12 (FAN2) - A36-4 (E01)(5) Fan No. 2 relay IG ON 10 to 13 V
Cooling fan operates at idling speed, A/C ON or high engine coolant temperature. (5) 0 to 0.5 V
A35-13 (SSHUT) - A36-4 (E01) EFI MAIN1 relay IG ON 0 to 1 V
A35-15 (TACH) - A36-4 (E01)(3) Engine Speed Hold the engine speed at 1500 r/min. Pulse generation (Refer to waveform 8.)
A35-17 (MCR) - A36-4 (E01) ETCS relay IG ON 0 to 1 V
A35-19(FPC) - A36-4 (E01) Fuel pump control IG ON Pulse generation (Refer to waveform 9.)
A35-20 (PPMP) - A36-4 (E01) Canister pressure sensor (integrated into canister pump module) IG ON 1.5 to 4.0 V
A35-21 (VCPA) - A36-4 (E01) Accelerator pedal position sensor power supply IG ON 4.5 to 5.5 V
A35-22 (VCP2) - A36-4 (E01) Accelerator pedal position sensor power supply IG ON 4.5 to 5.5 V
A35-23 (VPA) - A35-29 (EPA) Accelerator pedal position sensor (engine control) With IG ON, the accelerator pedal is fully open. Approx. 0.7 V
With IG ON, the accelerator pedal is fully closed. Approx. 3.1 V
A35-26 (STA) - A36-4 (E01) ST relay IG ON 10 to 13 V
Cranking 0 to 1 V
A35-31 (VPA2) - A35-30 (EPA2) Accelerator pedal position sensor (for detection of sensor malfunction) With IG ON, the accelerator pedal is fully open. Approx. 0.7 V
With IG ON, the accelerator pedal is fully closed. Approx. 3.1 V
A35-32 (ACCR) - A36-4 (E01)(3) Request for accessory cutoff IG ON 0 to 0.5 V
Cranking 12 to 14 V
A35-34 (STAR) - A36-4 (E01)(3) ST Cut Relay IG ON 0 to 0.5 V
Cranking 8 to 13 V
A35-35 (AC) - A36-4 (E01) HEATER relay Idling, A/C ON 0 to 0.5 V
Idling, A/C OFF 12 to 14 V
A36-1 (M-) - A36-4 (E01) Throttle actuator Idling, warm-up operation of engine Pulse generation (Refer to waveform 10.)
A36-2 (M+) - A36-4 (E01) Throttle actuator Idling, warm-up operation of engine Pulse generation (Refer to waveform 10.)
A36-5 (OE2) - A36-4 (E01) Camshaft timing oil control valve (OCV) (exhaust side (bank 2)) IG ON 11 to 14 V
Idling, warm-up operation of engine Pulse generation (Refer to waveform 11.)
A36-6 (HT1B) - A36-4 (E01) Oxygen sensor heater IG ON 11 to 14 V
Idling, cool-down operation of engine Pulse generation (Refer to waveform 12.)
A36-7 (OE1) - A36-4 (E01) Camshaft timing oil control valve (OCV) (exhaust side (bank 1)) IG ON 11 to 14 V
Idling, warm-up operation of engine Pulse generation (Refer to waveform 11.)
A36-8 (IGT4) - A36-4 (E01) Ignition coil (ignition signal) Idling, warm-up operation of engine Pulse generation (Refer to waveform 13.)
A36-10 (IGT2) - A36-4 (E01) Ignition coil (ignition signal) Idling, warm-up operation of engine Pulse generation (Refer to waveform 13.)
A36-11 (PRG) - A36-4 (E01) Purge VSV When one of the following conditions is met:
  • IG ON
  • Idling, warm-up operation of engine, purge control in progress
 Pulse generation (Refer to waveform 14.)
A36-12 (#10) - A36-4 (E01) Injector for port injection Idling, warm-up operation of engine Pulse generation (Refer to waveform 15.)
A36-13 (#40) - A36-4 (E01) Injector for port injection Idling, warm-up operation of engine Pulse generation (Refer to waveform 15.)
A36-14 (#1) - A36-4 (E01) Injector for direct injection Idling, warm-up operation of engine Pulse generation (Refer to waveform 4.)
A36-16 (OC2) - A36-4 (E01) Variable valve timing (VVT) sensor (intake side (bank 2)) IG ON 11 to 14 V
Idling, warm-up operation of engine Pulse generation (Refer to waveform 11.)
A36-17 (OC1) - A36-4 (E01) Variable valve timing (VVT) sensor (intake side (bank 1)) IG ON 11 to 14 V
Idling, warm-up operation of engine Pulse generation (Refer to waveform 11.)
A36-18 (VTA1) - A36-29 (E1) Throttle position sensor (engine control) With IG ON, the accelerator pedal is fully open. Approx. 0.6 V
With IG ON, the accelerator pedal is fully closed. Approx. 4.2 V
A36-19 (VC) - A36-29 (E1) Sensor power supply (voltage) IG ON 4.5 to 5.5 V
A36-20 (OT) - A36-29 (E1) Oil temperature sensor Idling 0.5 to 1.4 V
A36-21 (IGT1) - A36-4 (E01) Ignition coil (ignition signal) Idling, warm-up operation of engine Pulse generation (Refer to waveform 13.)
A36-22 (#20) - A36-4 (E01) Injector for port injection Idling, warm-up operation of engine Pulse generation (Refer to waveform 15.)
A36-23 (#4) - A36-4 (E01) Injector for direct injection Idling, warm-up operation of engine Pulse generation (Refer to waveform 4.)
A36-24 (#3) - A36-4 (E01) Injector for direct injection Idling, warm-up operation of engine Pulse generation (Refer to waveform 4.)
A36-25 (#2) - A36-4 (E01) Injector for direct injection Idling, warm-up operation of engine Pulse generation (Refer to waveform 4.)
A36-28 (VTA2) - A36-29 (E1) Throttle position sensor (for detection of sensor malfunction) With IG ON, the accelerator pedal is fully open. Approx. 1.5 V
With IG ON, the accelerator pedal is fully closed. Approx. 4.3 V
A36-30 (THW) - A36-29 (E1) E.F.I. water temperature sensor Idling, engine coolant temperature at 60 to 120°C {140 to 248°F} 0.8 to 1.8 V
A36-31 (IGT3) - A36-4 (E01) Ignition coil (ignition signal) Idling, warm-up operation of engine Pulse generation (Refer to waveform 13.)
A36-32 (#30) - A36-4 (E01) Injector for port injection Idling, warm-up operation of engine Pulse generation (Refer to waveform 15.)
A33-4 (EC) - chassis ground Ground Always Less than 1 Ω
A33-28 (SLE2) - chassis ground Shielded wire Always Less than 1 Ω
A34-1 (EC3) - chassis ground Ground Always Less than 1 Ω
A34-2 (EC4) - chassis ground Ground Always Less than 1 Ω
A34-3 (E05) - chassis ground Ground Always Less than 1 Ω
A34-29 (EKNK) - chassis ground Shielded wire Always Less than 1 Ω
A34-30 (SLE1) - chassis ground Shielded wire Always Less than 1 Ω
A34-35 (SLE3) - chassis ground Shielded wire Always Less than 1 Ω
A36-3 (E02) - chassis ground Ground Always Less than 1 Ω
A36-4 (E01) - chassis ground Ground Always Less than 1 Ω
A35-29 (EPA) - A36-4 (E01) Ground IG ON 0 to 1 V
A35-30 (EPA2) - A36-4 (E01) Ground IG ON 0 to 1 V
(1) Automatic transmission

(2) Manual transmission

(3) Models with smart entry & start system

(4) Models without smart entry & start system

(5) Models with air conditioner

(6) Models without air conditioner

(7) Models with ID code box

(8) Models without ID code box

(9) Manual air conditioning system
  1. Waveform
    NOTE: Oscilloscope waveforms shown below are just the reference, and the waveforms for noise and chattering are omitted.
    Fig 1: Waveform 1
    G12586113Courtesy of SUBARU OF AMERICA, INC.
    1. Waveform 1
      Item Contents
      Measuring terminal CANL ← →E01
      Equipment setting 1 V/DIV, 10 μs/DIV
      Condition Engine stop, IG ON
      Fig 2: Waveform 2
      G12586114Courtesy of SUBARU OF AMERICA, INC.
    2. Waveform 2
      Item Contents
      Measuring terminal CANH ← →E01
      Equipment setting 1 V/DIV, 10 μs/DIV
      Condition Engine stop, IG ON
      Fig 3: Waveform 3
      G12586115Courtesy of SUBARU OF AMERICA, INC.
    3. Waveform 3
      Item Contents
      Measuring terminal HA1A ← →E01
      Equipment setting 5 V/div, 50 ms/div
      Condition While engine idling before warming up air/fuel ratio sensor
      Fig 4: Waveform 4
      G12586116Courtesy of SUBARU OF AMERICA, INC.
    4. Waveform 4
      Item Contents
      Measuring terminal CH1: #1, #2, #3, #4 ← → E01
      CH2: IJF1, IJF2 ← →E01
      Equipment setting 2 V/div, 40 μs/div
      Condition After warm-up, during idling
      Fig 5: Waveform 5
      G12586117Courtesy of SUBARU OF AMERICA, INC.
    5. Waveform 5
      Item Contents
      Measuring terminal CH1: FPD ← → E01
      CH2: FPF ← →E01
      Equipment setting 2 V/div, 20 ms/div
      Condition After warm-up, during idling
      Fig 6: Waveform 6
      G12586118Courtesy of SUBARU OF AMERICA, INC.
    6. Waveform 6
      Item Contents
      Measuring terminal CH1: NE+ ← → NE-
      CH2: EV1+ ← → E01
      CH3: EV2+ ← →E01
      Equipment setting 5 V/div, 10 ms/div
      Condition After warm-up, during idling
      Fig 7: Waveform 7
      G12586119Courtesy of SUBARU OF AMERICA, INC.
    7. Waveform 7
      Item Contents
      Measuring terminal CH1: NE+ ← → NE-
      CH2: VV1+ ← → E01
      CH3: VV2+ ← →E01
      Equipment setting 5 V/div, 10 ms/div
      Condition After warm-up, during idling
      Fig 8: Waveform 8
      G12586120Courtesy of SUBARU OF AMERICA, INC.
    8. Waveform 8
      Item Contents
      Measuring terminal TACH ← →E01
      Equipment setting 5 V/div, 10 ms/div
      Condition Hold at engine speed of 1500 r/min.
      Fig 9: Waveform 9
      G12586121Courtesy of SUBARU OF AMERICA, INC.
    9. Waveform 9
      Item Contents
      Measuring terminal FPC ← →E01
      Equipment setting 5 V/div, 5 ms/div
      Condition IG ON
      Fig 10: Waveform 10
      G12586122Courtesy of SUBARU OF AMERICA, INC.
    10. Waveform 10
      Item Contents
      Measuring terminal CH1: M+ ← → E01
      CH2: M- ← →E01
      Equipment setting CH1: 5 V/div, 500 μs/div
      CH2: 200 mV/div, 500 μs/div
      Condition After warm-up, during idling
      Fig 11: Waveform 11
      G12586123Courtesy of SUBARU OF AMERICA, INC.
    11. Waveform 11
      Item Contents
      Measuring terminal OC1 ← → E01
      OC2 ← → E01
      OE1 ← → E01
      OE2 ← →E01
      Equipment setting 5 V/div, 1 ms/div
      Condition After warm-up, during idling
      Fig 12: Waveform 12
      G12586124Courtesy of SUBARU OF AMERICA, INC.
    12. Waveform 12
      Item Contents
      Measuring terminal HT1B ← →E01
      Equipment setting 5 V/div, 50 ms/div
      Condition While engine is idling before warming up the oxygen sensor
      Fig 13: Waveform 13
      G12586125Courtesy of SUBARU OF AMERICA, INC.
    13. Waveform 13
      Item Contents
      Measuring terminal IGT1 ← → E01
      IGT2 ← → E01
      IGT3 ← → E01
      IGT4 ← →E01
      Equipment setting 2 V/div, 20 ms/div
      Condition After warm-up, during idling
      Fig 14: Waveform 14
      G12586126Courtesy of SUBARU OF AMERICA, INC.
    14. Waveform 14
      Item Contents
      Measuring terminal PRG ← →E01
      Equipment setting 10 V/div, 2 s/div
      Condition After warming up, while engine idling, during purge control, or IG ON
      Fig 15: Waveform 15
      G12586127Courtesy of SUBARU OF AMERICA, INC.
    15. Waveform 15
      Item Contents
      Measuring terminal #10 ← → E01
      #20 ← → E01
      #30 ← → E01
      #40 ← →E01
      Equipment setting 20 V/div, 20 ms/div
      Condition After warm-up, during idling
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