LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2015 >> Forester 2.5i Limited, Eng CD FB25BA >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (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 Connector Terminal
G05334606Courtesy of SUBARU OF AMERICA, INC.
Description
 		 Connector No. Terminal No. Signal (V) Note
Ignition SW ON (engine OFF) Engine ON (idling)
Crankshaft position sensor Signal (+) B136 16 0 -7 - +7 Waveform
Signal (-) B136 27 0 0 -
Shield B136 35 0 0 -
Front oxygen (A/F) sensor Signal (+) B136 19 2.8 - 3.2 2.8 - 3.2 -
Signal (-) B136 18 2.4 - 2.7 2.4 - 2.7 -
Shield B136 30 0 0 -
Rear oxygen sensor Signal B136 21 0 0 - 0.9 -
Shield B136 30 0 0 -
Front oxygen (A/F) sensor heater signal B136 5 - - Waveform
Rear oxygen sensor heater signal B134 6 0 - 13 - Waveform
Engine coolant temperature sensor Signal B134 30 1.0 - 1.4 1.0 - 1.4 After engine is warmed up.
Air flow sensor Signal B137 22 - 0.3 - 4.5 -
Shield B137 28 0 0 -
Ground B137 29 0 0 -
Intake air temperature sensor signal B137 12 0.3 - 4.6 0.3 - 4.6 -
Engine oil temperature sensor signal B134 20 1.0 - 1.4 1.0 - 1.4 After engine is warmed up.
Starter switch B137 17 0 0 Model without push button start
Cranking: 8 - 14
Model with push button start
Cranking: waveform
Accessory cut request B135 32 10 - 13 12 - 14 Model with push button start
Cranking: 0
Starter switch 2 B137 14 0 0 Model with push button start
Cranking: 8 - 14
Starter cut relay B135 34 0 0 Model with push button start
Cranking: 8 - 14
Ignition switch B137 27 10 - 13 12 - 14 -
Neutral position switch B137 16 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 -
Delivery mode switch B137 13 10 - 13 12 - 14 When fuse is installed: 0
Knock sensor Signal B136 28 2.5 2.5 -
Shield B136 29 0 0 -
Back-up power supply B137 2 10 - 13 12 - 14 Ignition switch "OFF": 10 - 13
Control module power supply B136 6 10 - 13 12 - 14 -
B137 1 10 - 13 12 - 14 -
Sensor power supply B134 19 5 5 -
B135 22 5 5 -
Ignition control #1 B134 21 0 0 or 5 Waveform
#2 B134 10 0 0 or 5 Waveform
#3 B134 31 0 0 or 5 Waveform
#4 B134 8 0 0 or 5 Waveform
Fuel injector #1 B134 12 10 - 13 1 - 14 Waveform
#2 B134 22 10 - 13 1 - 14 Waveform
#3 B134 32 10 - 13 1 - 14 Waveform
#4 B134 13 10 - 13 1 - 14 Waveform
Fuel pump relay control B135 19 ON: 0.5 or less
OFF: 10 - 13		 ON: 0.5 or less
OFF: 12 - 14		 -
A/C relay control B135 35 ON: 0.5 or less
OFF: 10 - 13		 ON: 0.5 or less
OFF: 12 - 14		 -
A/C switch B137 26 ON: 10 - 13
OFF: 0		 ON: 12 - 14
OFF: 0		 Manual A/C model
Blower fan switch B137 20 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 Manual A/C model
A/C middle pressure switch B137 8 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 -
Main fan relay control B135 12 ON: 0.5 or less
OFF: 10 - 13		 ON: 0.5 or less
OFF: 12 - 14		 -
Sub fan relay control B135 11 ON: 0.5 or less
OFF: 10 - 13		 ON: 0.5 or less
OFF: 12 - 14		 -
Engine speed output B135 15 - 0 - 13 or more Model with push button start Waveform
Purge control solenoid valve B134 11 ON: 1 or less
OFF: 10 - 13		 ON: 1 or less
OFF: 12 - 14		 Waveform
EGR control valve Signal 1 B136 11 0 or 10 - 13 0 or 12 - 14 -
Signal 2 B136 13 0 or 10 - 13 0 or 12 - 14 -
Signal 3 B136 31 0 or 10 - 13 0 or 12 - 14 -
Signal 4 B136 32 0 or 10 - 13 0 or 12 - 14 -
Manifold absolute pressure sensor signal B136 20 3.4 - 3.8 1.1 - 1.6 -
Electronic throttle control Main B134 18 Approx. 0.7 Approx. 0.6 - 0.7 (After engine is warmed up.) Fully closed: Approx. 0.6
Fully open: Approx. 4.0
Sub B134 28 Approx. 1.6 Approx. 1.5 - 1.6
(After engine is warmed up.)		 Fully closed: Approx. 1.5
Fully open: Approx. 4.2
Electronic throttle control motor (+) B134 2 Duty waveform Duty waveform Drive frequency: 500 Hz
Electronic throttle control motor (-) B134 1 Duty waveform Duty waveform Drive frequency: 500 Hz
Electronic throttle control motor power supply B135 7 10 - 13 12 - 14 -
Electronic throttle control motor relay B135 17 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 When ignition switch is turned to ON: ON
Intake oil control solenoid (LH) B134 16 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 10 - 13		 -
Intake oil control solenoid (RH) B134 17 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 10 - 13		 -
Intake camshaft position sensor (LH) B136 15 0 or 5 0 or 5 Waveform
Intake camshaft position sensor (RH) B136 26 0 or 5 0 or 5 Waveform
Camshaft position sensor ground B136 34 0 0 -
Accelerator pedal position sensor Main sensor signal B135 23 Fully closed: 0.4 - 1.0
Fully opened: 2.4 - 3.7		 Fully closed: 0.4 - 1.0
Fully opened: 2.4 - 3.7		 -
Main power supply B135 21 5 5 -
Ground (main sensor) B135 29 0 0 -
Sub signal sensor B135 31 Fully closed: 0.3 - 1.1
Fully opened: 2.3 - 3.8		 Fully closed: 0.3 - 1.1
Fully opened: 2.3 - 3.8		 -
Starter relay B135 26 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 ON: cranking
Clutch switch B137 15 When clutch pedal is depressed: 0
When clutch pedal is released:
10 - 13		 When clutch pedal is depressed: 0
When clutch pedal is released:
12 - 14		 MT model
Brake switch 1 (brake switch) B137 7 When brake pedal is depressed: 0
When brake pedal is released:
10 - 13		 When brake pedal is depressed: 0
When brake pedal is released: 12 - 14		 -
Brake switch 2 (stop light switch) B137 3 When brake pedal is depressed:
10 - 13
When brake pedal is released: 0		 When brake pedal is depressed: 12 - 14
When brake pedal is released: 0		 -
Cruise control command switch B137 30 When operating nothing: 3.5 - 4.5
When operating RES/ACC: 2.5 - 3.5
When operating following distance setting: 1.5 - 2.5
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 following distance setting: 1.5 - 2.5
When operating SET/COAST: 0.5 - 1.5
When operating CANCEL: 0 - 0.5		 -
Cruise control main switch B137 23 ON: 0 OFF: 5 ON: 0
OFF: 5		 -
CAN communication (Hi) B137 19 - - -
(Lo) B137 18 - - -
Self-shutoff control B135 13 0 0 -
Oil level switch B136 24 0 0 Oil level LOW: 10 - 14
Generator control B135 18 0 - 6.5 0 - 6.5 -
Battery current sensor B137 11 2.6 - 2.8 2.4 - 2.6 After engine is warmed up. (New battery)
Battery temperature sensor B137 24 1.1 - 2.4 1.1 - 2.4 When battery temperature is 20 - 50°C (68 - 122°F)
Tumble generator valve opening angle switch signal (LH) B136 9 Fully closed: 0.5 or less
Fully opened: 9.5 or more		 Fully closed: 0.5 or less
Fully opened: 9.5 or more		 -
Tumble generator valve (LH open) B134 23 0 or 10 - 13 0 or 12 - 14 -
Tumble generator valve (LH closed) B134 24 0 or 10 - 13 0 or 12 - 14 -
Tumble generator valve opening angle switch signal (RH) B136 23 Fully closed: 0.5 or less
Fully opened: 9.5 or more		 Fully closed: 0.5 or less
Fully opened: 9.5 or more		 -
Tumble generator valve (RH open) B134 25 0 or 10 - 13 0 or 12 - 14 -
Tumble generator valve (RH closed) B134 14 0 or 10 - 13 0 or 12 - 14 -
Immobilizer communication B135 25 - - -
ELCM Switching valve B135 1 10 - 13 12 - 14 Operating: 0
Pressure sensor B135 20 1 - 4 1 - 4 When ignition switch is turned to ON: atmospheric pressure
Vacuum pump B135 8 10 - 13 12 - 14 Operating: 0
Ground Sensor B134 29 0 0 -
B135 30 0 0 -
Engine 1 B134 4 0 0 -
Engine 2 B134 3 0 0 -
Engine 3 B136 1 0 0 -
Engine 4 B136 2 0 0 -
Engine 5 B136 3 0 0 -
Body B137 4 0 0 -
scientia non olet · About LEMON Manuals