LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2017 >> Outback 2.5i >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics - Introduction) (H4DO) >> Engine Control Module (ECM) I/O Signal >> Electrical Specification >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Electrical Specification: Notes

Fig 1: Engine Control Module (ECM) I/O Signal Connector Terminals
G10310197Courtesy 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, 10 and 11
(-) 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 Waveform 3
(-) 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 - 1.4 1 - 1.4 -
Engine oil temperature sensor signal E158 18 1 - 1.4 1 - 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 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 power supply B134 30 5 5 -
Main ground B134 33 0 0 -
Sub 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 power supply B134 28 5 5 -
Sub 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 valve RH E158 20 Battery voltage 0 or battery voltage Waveform 7
Intake oil control solenoid valve LH E158 6 Battery voltage 0 or battery voltage Waveform 7
Purge control solenoid valve E158 51 Battery voltage Battery voltage Waveform 8
Operating: 0
Leak check valve assembly 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 Battery voltage Operating: 0
Ignition coil #1 E158 37 0 0 or 5 Waveform 10
#2 E158 35 0 0 or 5 Waveform 10
#3 E158 38 0 0 or 5 Waveform 10
#4 E158 36 0 0 or 5 Waveform 10
Fuel injector #1 E158 23 Battery voltage 0 or battery voltage Waveform 11
#2 E158 8 Battery voltage 0 or battery voltage Waveform 11
#3 E158 9 Battery voltage 0 or battery voltage Waveform 11
#4 E158 22 Battery voltage 0 or battery voltage Waveform 11
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 sensor Main 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 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 9
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 14
Model with push button start
Waveform 12
Starter cut relay control B134 49 Waveform Waveform Model without push button start
Waveform 14
Model with push button start
Waveforms 12 and 13
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: Battery voltage
Starter switch B134 46 Waveform Waveform Model without push button start
Waveform 14
Model with push button start
Waveform 12
Starter switch 2 B134 58 Waveform Waveform Model without push button start
Waveform 14
Model with push button start
Waveform 12
Accessory cut request B134 64 Waveform Waveform Model without push button start
Waveform 14
Model with push button start
Waveform 13
Engine speed output B134 10 0 0 or battery voltage Model without push button start
Waveform 14
Model with push button start
Waveform 13
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.