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Home >> Subaru >> 2015 >> Outback 2.5i >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (Diagnostics) (H4DO) >> Engine Control Module (ECM) I/O Signal >> Electrical Specification
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Electrical Specification

Fig 1: Engine Control Module (ECM) I/O Signal Connector Terminal Identification
G10263229Courtesy of SUBARU OF AMERICA, INC.
Description Connector No. Terminal No. Signal (V) Note
Ignition SW ON After warm-up (at engine OFF) Engine ON After warm-up (at idle)
Crankshaft position sensor + signal E158 40 0 -7 - +7 Waveform 1
- signal E158 27 0 0 -
Shield E158 53 0 0 -
Intake camshaft position sensor RH E158 54 0 or 5 0 or 5 Waveform 1
Intake camshaft position sensor LH E158 41 0 or 5 0 or 5 Waveform 1
Camshaft position sensor ground E158 42 0 0 -
Front oxygen (A/F) sensor + signal E158 46 2.8 - 3.2 2.8 - 3.2 Waveform 2
- signal E158 33 1.3 - 3.1 2.4 - 2.7 -
Heater signal E158 5 Battery voltage 0 or battery voltage Waveform 4
Rear oxygen sensor + signal E158 57 0.1 - 0.3 0.2 - 2.1 -
- signal E158 56 1.4 - 1.5 1.1 - 1.7 Waveform 3
Heater signal E158 10 Battery voltage 0 or battery voltage Waveform 4
Oxygen sensor shield E158 58 0 0 -
Air flow sensor Signal B134 16 0.6 - 1 0.3 - 4.5 -
Ground B134 17 0 0 -
Shield B134 3 0 0 -
Intake air temperature sensor signal B134 15 0.3 - 4.6 0.3 - 4.6 -
Engine coolant temperature sensor signal E158 43 1.0 - 1.4 1.0 - 1.4 -
Engine oil temperature sensor signal E158 18 1.0 - 1.4 1.0 - 1.4 -
Manifold absolute pressure sensor signal E158 15 3.5 - 4.8 1.4 - 2.1 -
Knock sensor Signal E158 30 2.4 - 2.6 2.1 - 2.8 -
Shield E158 17 0 0 -
Accelerator pedal position sensor Main sensor signal B134 29 Fully closed: 0.3 - 1.1
Fully opened: 2.3 - 3.8		 Fully closed: 0.3 - 1.4
Fully opened: 2.4 - 3.8		 -
Main sensor power supply B134 30 5 5 -
Main sensor ground B134 33 0 0 -
Sub sensor signal B134 31 Fully closed: 0.3 - 1.1
Fully opened: 2.3 - 3.8		 Fully closed: 0.3 - 1.4
Fully opened: 2.3 - 3.8		 -
Sub sensor power supply B134 28 5 5 -
Sub sensor ground B134 34 0 0 -
Tumble generator valve RH Position signal E158 47 Waveform Waveform Waveform 5
Motor open E158 52 Waveform Waveform Waveform 5
Motor closed E158 13 Waveform Waveform Waveform 5
Tumble generator valve LH Position signal E158 59 Waveform Waveform Waveform 6
Motor open E158 26 Waveform Waveform Waveform 6
Motor closed E158 39 Waveform Waveform Waveform 6
Intake oil control solenoid RH E158 20 Battery voltage 0 or battery voltage Waveform 7
Intake oil control solenoid LH E158 6 Battery voltage 0 or battery voltage Waveform 7
Purge control solenoid valve E158 51 Battery voltage Battery voltage Waveform 7
Operating: 0
ELCM Switching valve B134 61 Battery voltage Battery voltage Operating: 0
Pressure sensor B134 21 1 - 4 1 - 4 When ignition switch is turned to ON: atmospheric pressure
Vacuum pump B134 9 Battery voltage 0 or battery voltage Operating: 0
Ignition coil #1 E158 37 0 0 or 5 Waveform 8
#2 E158 35 0 0 or 5 Waveform 8
#3 E158 38 0 0 or 5 Waveform 8
#4 E158 36 0 0 or 5 Waveform 8
Fuel injector #1 E158 23 Battery voltage 0 or battery voltage Waveform 9
#2 E158 8 Battery voltage 0 or battery voltage Waveform 9
#3 E158 9 Battery voltage 0 or battery voltage Waveform 9
#4 E158 22 Battery voltage 0 or battery voltage Waveform 9
EGR control valve Signal 1 E158 12 0 or battery voltage 0 or battery voltage -
Signal 2 E158 48 0 or battery voltage 0 or battery voltage -
Signal 3 E158 25 0 or battery voltage 0 or battery voltage -
Signal 4 E158 49 0 or battery voltage 0 or battery voltage -
Electronic throttle control Main sensor signal E158 29 Approx. 0.7 Approx. 0.6 - 1.2 Fully closed: Approx. 0.6 - 1.2
Fully opened: Approx. 3.8 - 4.4
Sub sensor signal E158 31 Approx. 1.6 Approx. 1.5 - 1.7 Fully closed: Approx. 1.4 - 2.0
Fully opened: Approx. 4.0 - 4.6
Shield E158 19 0 0 -
Motor (+) E158 14 0 or battery voltage 0 or battery voltage Drive frequency: 500 Hz
Waveform 7
Motor (-) E158 1 Duty waveform Duty waveform Drive frequency: 500 Hz
Electronic throttle control motor power supply B134 13 Battery voltage Battery voltage -
Electronic throttle relay control B134 65 ON: 0 ON: 0 -
Self-shutoff relay control B134 60 0 0 -
Starter relay control B134 62 Waveform Waveform Model without push button start
Waveform 12
Model with push button start
Waveform 10
Starter cut relay control B134 49 Waveform Waveform Model without push button start
Waveform 12
Model with push button start
Waveform 10
Fuel pump relay control B134 63 Battery voltage 0 ON: 0
OFF:
Main fan relay control B134 51 Battery voltage Battery voltage ON: 0
Sub fan relay control B134 37 Battery voltage Battery voltage ON: 0
Ignition switch B134 2 Battery voltage Battery voltage -
Neutral position switch B134 5 ON: 0
OFF: Battery voltage		 ON: 0
OFF: Battery voltage		 -
Delivery mode switch B134 6 Battery voltage Battery voltage When fuse is installed: 0
Oil level switch E158 3 0 0 Oil level LOW: 10 - 14
Starter switch B134 46 Waveform Waveform Model without push button start
Waveform 12
Model with push button start
Waveform 10
Starter switch 2 B134 58 Waveform Waveform Model without push button start
Waveform 12
Model with push button start
Waveform 10
Accessory cut request B134 64 Waveform Waveform Model without push button start
Waveform 12
Model with push button start
Waveform 11
Engine speed output B134 10 0 0 or battery voltage Model without push button start
Waveform 12
Model with push button start
Waveform 11
Clutch switch B134 42 When clutch pedal is depressed: 0
When clutch pedal is released: Battery voltage		 When clutch pedal is depressed: 0
When clutch pedal is released: Battery voltage		 MT model
Brake switch 1 (Brake switch) B134 59 When brake pedal is depressed: 0
When brake pedal is released: Battery voltage		 When brake pedal is depressed: 0
When brake pedal is released: Battery voltage		 -
Brake switch 2 (Stop light switch) B134 48 When brake pedal is depressed: Battery voltage
When brake pedal is released: 0		 When brake pedal is depressed: Battery voltage
When brake pedal is released: 0		 -
Cruise control main switch B134 44 ON: 0
OFF: 5		 ON: 0
OFF: 5		 Model without EyeSight
Cruise control command switch B134 22 When operating nothing: 3.5 - 4.5
When operating RES/ACC: 2.5 - 3.5
When operating SET/COAST: 0.5 - 1.5
When operating CANCEL: 0 - 0.5		 When operating nothing: 3.5 - 4.5
When operating RES/ACC: 2.5 - 3.5
When operating SET/COAST: 0.5 - 1.5
When operating CANCEL: 0 - 0.5		 Model without EyeSight
Generator control B134 23 0 or 6.5 0 or 6.5 -
LIN communication B134 55 - - -
Immobilizer communication B134 38 - - -
CAN communication HI B134 25 - - -
LO B134 24 - - -
Control module power supply B134 1 Battery voltage Battery voltage -
B134 14 Battery voltage Battery voltage -
Backup power supply B134 27 Battery voltage Battery voltage Ignition switch OFF:
Battery voltage
Sensor power supply B134 35 5 5 -
E158 32 5 5 -
Ground Body B134 53 0 0 -
Sensor B134 32 0 0 -
E158 34 0 0 -
Engine 1 E158 65 0 0 -
Engine 2 E158 64 0 0 -
Engine 3 E158 63 0 0 -
Engine 4 E158 62 0 0 -
Engine 5 E158 61 0 0 -
NOTE:
  • After engine is warmed up, attach the check board for measurement.
  • Set the select lever in "P" range or "N" range, or the shift lever in neutral.
  • Turn the A/C to OFF.
  • Turn all the accessory switches to OFF.
  • Waveforms vary depending on a measurement environment and vehicle condition.
  1. Waveform 1
    Fig 2: Crankshaft Position Sensor, Camshaft Position Sensor RH And LH Waveform
    G10263230Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Crankshaft position sensor (E158) No. 40 - Chassis ground:
    Camshaft position sensor RH (E158) No. 54 - Chassis ground:
    Camshaft position sensor LH (E158) No. 41 - Chassis ground:
    Measuring condition While engine idling
  2. Waveform 2
    Fig 3: Front Oxygen (A/F) Sensor, Engine Speed And Electronic Throttle Control Opening Valve Waveform
    G10263231Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Front oxygen (A/F) sensor (E158) No. 46 (+) - Chassis ground:
    Engine speed
    Throttle valve opening angle
    Measuring condition (a) Accelerator pedal fully closed (b) Accelerator pedal half open (c) Accelerator pedal fully opened
  3. Waveform 3
    Fig 4: Rear Oxygen Sensor, Engine Speed And Electronic Throttle Opening Valve Waveform
    G10263232Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Rear oxygen sensor (E158) No. 57 (+) - (E158) No. 56 (-):
    Engine speed
    Throttle valve opening angle
    Measuring condition (a) Accelerator pedal fully closed (b) Accelerator pedal half open (c) Accelerator pedal fully opened
  4. Waveform 4
    Fig 5: Front And Rear Oxygen (A/F) Sensor Heater Signal Waveform
    G10263233Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Front oxygen (A/F) sensor heater (E158) No. 5 (+) - Chassis ground:
    Rear oxygen sensor heater (E158) No. 10 (+) - Chassis ground:
    Measuring condition While engine idling
  5. Waveform 5
    Fig 6: Tumble Generator Valve, Engine Speed And Throttle Valve Opening Angle Waveform
    G10263234Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Tumble generator valve RH motor open (E158) No. 52 (+) - Chassis ground:
    Tumble generator valve RH motor closed (E158) No. 13 (+) - Chassis ground:
    Engine speed
    Tumble generator valve RH position signal (E158) No. 47 (+) - Chassis ground:
    Throttle valve opening angle
    Measuring condition (a) Accelerator pedal fully closed (b) Accelerator pedal fully opened
  6. Waveform 6
    Fig 7: Tumble Generator Valve, Engine Speed And Electronic Throttle Opening Angle Waveform
    G10263235Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Tumble generator valve LH motor open (E158) No. 26 (+) - Chassis ground:
    Tumble generator valve LH motor closed (E158) No. 39 (+) - Chassis ground:
    Engine speed
    Tumble generator valve LH position signal (E158) No. 59 (+) - Chassis ground:
    Throttle valve opening angle
    Measuring condition (a) Accelerator pedal fully closed (b) Accelerator pedal fully opened
  7. Waveform 7
    Fig 8: Intake Oil Control Solenoid Valve, Purge Control Solenoid Valve And Electronic Throttle Control Motor Waveform
    G10263236Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Intake oil control solenoid valve RH (E158) No. 20 (+) - Chassis ground:
    Intake oil control solenoid valve LH (E158) No. 6 (+) - Chassis ground:
    Purge control solenoid valve (E158) No. 51 (+) - Chassis ground:
    Electronic throttle control motor (E158) No. 14 (+) - Chassis ground:
    Measuring condition While engine idling
    Purge control solenoid valve: At 2000 rpm (during evaporative purge control)
  8. Waveform 8
    Fig 9: Crankshaft Position Sensor And Ignition Coil Waveform
    G10263237Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Crankshaft position sensor (E158) No. 40 (+) - Chassis ground:
    Ignition coil #1 (E158) No. 37 (+) - Chassis ground:
    Ignition coil #2 (E158) No. 35 (+) - Chassis ground:
    Ignition coil #3 (E158) No. 38 (+) - Chassis ground:
    Ignition coil #4 (E158) No. 36 (+) - Chassis ground:
    Measuring condition While engine idling
  9. Waveform 9
    Fig 10: Crankshaft Position Sensor And Fuel Injector Waveform
    G10263238Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Crankshaft position sensor (E158) No. 40 (+) - Chassis ground:
    Fuel injector #1 (E158) No. 23 (+) - Chassis ground:
    Fuel injector #2 (E158) No. 8 (+) - Chassis ground:
    Fuel injector #3 (E158) No. 9 (+) - Chassis ground:
    Fuel injector #4 (E158) No. 22 (+) - Chassis ground:
    Measuring condition While engine idling
  10. Waveform 10
    Fig 11: Starter Relay Control, Starter Cut Relay Contro And Starter Switch Waveform
    G10263239Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Starter relay control (E134) No. 62 (+) - Chassis ground:
    Starter cut relay control (E134) No. 49 (+) - Chassis ground:
    Starter switch (E134) No. 46 (+) - Chassis ground:
    Starter switch 2 (E134) No. 58 (+) - Chassis ground:
    Measuring condition When engine is started
  11. Waveform 11
    Fig 12: Starter Cut Relay Control, Engine Speed Output, Battery Voltage Waveform
    G10263240Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Starter cut relay control (E134) No. 49 (+) - Chassis ground:
    Engine speed output (E134) No. 10 (+) - Chassis ground:
    ACC cut request (E134) No. 64 (+) - Chassis ground:
    Battery voltage (battery terminal) (+) - Chassis ground:
    Measuring condition When engine is started
  12. Waveform 12
    Fig 13: Starter Relay Control, Starter Cut Relay Control, Starter Switch And Engine Speed Output Waveform
    G10263241Courtesy of SUBARU OF AMERICA, INC.
    Measured terminal Starter relay control (B134) No. 62 (+) - Chassis ground:
    Starter cut relay control (B134) No. 49 (+) - Chassis ground:
    Starter switch (B134) No. 46 (+) - Chassis ground:
    Starter switch 2 (B134) No. 58 (+) - Chassis ground:
    ACC cut request (B134) No. 64 (+) - Chassis ground:
    Engine speed output (B134) No. 10 (+) - Chassis ground:
    Measuring condition When engine is started
    Fig 14: Engine Control Module (ECM) I/O Signal - Wiring Diagram (1 Of 4)
    G10263242Courtesy of SUBARU OF AMERICA, INC.
    Fig 15: Engine Control Module (ECM) I/O Signal - Wiring Diagram (2 Of 4)
    G10263243Courtesy of SUBARU OF AMERICA, INC.
    Fig 16: Engine Control Module (ECM) I/O Signal - Wiring Diagram (3 Of 4)
    G10263244Courtesy of SUBARU OF AMERICA, INC.
    Fig 17: Engine Control Module (ECM) I/O Signal - Wiring Diagram (4 Of 4)
    G10263245Courtesy of SUBARU OF AMERICA, INC.
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