LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2013 >> Forester XT Premium >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls (Diagnostics) (H4DOTC) >> 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: Identifying Engine Control Module (ECM) I/O Signal Connector Terminals
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 (+) B137 17 0 -7 - +7 Waveform
Signal (-) B137 25 0 0 -
Shield B137 31 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 9 0 0 -
Rear oxygen sensor Signal B136 20 0 0 - 0.9 -
Shield B136 9 0 0 -
Ground (sensor) B135 30 0 0 -
Front oxygen (A/F) sensor heater Signal 1 B136 6 - - Waveform
Signal 2 B136 5 - - Waveform
Rear oxygen sensor heater signal B135 6 0 - 13 12 - 14 Waveform
Engine coolant temperature sensor Signal B137 22 1.0 - 1.4 1.0 - 1.4 After engine is warmed up
Ground (sensor) B134 29 0 0 After engine is warmed up
Air flow sensor Signal B136 22 - 0.3 - 4.5 -
Shield B136 10 0 0 -
Ground B136 11 0 0 -
Intake air temperature sensor signal B136 31 0.3 - 4.6 0.3 - 4.6 -
Wastegate control solenoid valve B134 33 0 or 10 - 13 0 or 12 - 14 Waveform
Starter switch B136 16 0 0 Cranking: 8 - 14
A/C switch B136 29 ON: 10 - 13
OFF: 0		 ON: 12 - 14
OFF: 0		 -
Ignition switch B136 30 10 - 13 12 - 14 -
Neutral position switch B136 35 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 -
Delivery (test) mode connector B136 34 10 - 13 13 - 14 When connected: 0
Knock sensor Signal B137 2 2.8 2.8 -
Shield B137 8 0 0 -
Back-up power supply B136 2 10 - 13 12 - 14 Ignition switch "OFF": 10 - 13
Control module power supply B136 1 10 - 13 12 - 14 -
B137 7 10 - 13 12 - 14 -
Sensor power supply B134 19 5 5 -
Ignition control #1 B134 21 0 0 or 5 Waveform
#2 B134 22 0 0 or 5 Waveform
#3 B134 31 0 0 or 5 Waveform
#4 B134 32 0 0 or 5 Waveform
Fuel injector #1 B134 10 10 - 13 1 - 14 Waveform
#2 B134 11 10 - 13 1 - 14 Waveform
#3 B134 12 10 - 13 1 - 14 Waveform
#4 B134 13 10 - 13 1 - 14 Waveform
Fuel pump control unit Control B136 33 0 or 5 0 or 5 Waveform
Diagnostic signal B135 10 10 - 13 12 - 14 -
A/C relay control B135 35 ON: 0.5 or less
OFF: 10 - 13		 ON: 0.5 or less
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 Waveform
Purge control solenoid valve 1 B137 6 ON: 1 or less
OFF: 10 - 13		 ON: 1 or less
OFF: 12 - 14		 Waveform
Purge control solenoid valve 2 B137 15 ON: 1 or less
OFF: 10 - 13		 ON: 1 or less
OFF: 12 - 14		 Waveform
Manifold absolute pressure sensor Signal B137 20 1.7 - 2.4 1.1 - 1.6 -
Power supply B134 19 5 5
Ground (sensor) B134 29 0 0
Power steering oil pressure switch B137 28 10 - 13 ON: 0
OFF: 12 - 14		 -
SSM/GST communication line B135 14 1 or less ↔ 4 or more 1 or less ↔ 4 or more -
Intake camshaft position sensor (LH) B137 16 0 or 5 0 or 5 Waveform
Intake camshaft position sensor (RH) B137 24 0 or 5 0 or 5 Waveform
Intake camshaft position sensor ground B137 30 0 0 -
Electronic throttle control Main B134 18 Approx. 0.9
(After engine is warmed up.)		 Approx. 0.6 - 0.7
(After engine is warmed up.)		 Fully closed: Approx. 0.6
Fully open: Approx. 4.0
Sub B134 28 Approx. 1.7
(After engine is warmed up.)		 Approx. 1.5 - 1.6
(After engine is warmed up.)		 Fully closed: Approx. 1.5
Fully open: Approx. 4.2
Power supply B134 19 5 5 -
Ground (sensor) B134 29 0 0 -
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 flow control solenoid valve (LH) Signal (+) B134 17 ON: 10 - 13
OFF: 0		 ON: 12 - 14
OFF: 0		 -
Signal (-) B134 16 0 0 -
Intake oil flow control solenoid valve (RH) Signal (+) B134 34 ON: 10 - 13
OFF: 0		 ON: 12 - 14
OFF: 0		 -
Signal (-) B134 27 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 -
Shield B136 4 0 0 -
Sub sensor signal 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		 -
Sub power supply B135 22 5 5 -
Ground (sub sensor) B135 30 0 0 -
Starter relay B135 26 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 ON: cranking
Pressure switch B136 7 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 -
Blower fan switch B135 19 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 Manual A/C model
Brake switch 1 (brake switch) B136 15 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) B136 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 B136 12 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		 -
Cruise control main switch B136 13 ON: 0
OFF: 5		 ON: 0
OFF: 5		 -
Pressure control solenoid valve assembly B135 3 ON: 1 or less
OFF: 10 - 13		 ON: 1 or less
OFF: 12 - 14		 -
Immobilizer Signal 1 B135 25 - - -
Signal 2 B135 24 - - -
CAN communication (Hi) B136 17 - - -
CAN communication (Lo) B136 28 - - -
Blow-by leak diagnosis B137 12 0 0 At the time of open circuit (fault): 5
Tumble generator valve position sensor signal (RH) B137 11 Fully closed: 0.4 - 1.2
Fully opened: 2.8 - 4.6		 Fully closed: 0.4 - 1.2
Fully opened: 2.8 - 4.6		 -
Tumble generator valve position sensor signal (LH) B137 10 Fully closed: 0.4 - 1.2
Fully opened: 2.8 - 4.6		 Fully closed: 0.4 - 1.2
Fully opened: 2.8 - 4.6		 -
Tumble generator valve (RH closed) B134 26 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 (RH open) B134 25 0 or 10 - 13 0 or 12 - 14 -
Tumble generator valve (LH open) B134 23 0 or 10 - 13 0 or 12 - 14 -
Secondary air pipe pressure sensor Signal B137 9 2.2 - 2.8 2.2 - 2.8 When secondary air is inducted: 3.2 - 4.9
Power supply B134 19 5.12 5.12 -
Ground (sensor) B134 29 0 0 -
Secondary air combination valve relay 1 B135 8 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 -
Secondary air combination valve relay 2 B135 20 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 -
Secondary air pump relay B135 27 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 -
Self-shutoff control B135 13 10 - 13 12 - 14 -
ELCM Switching valve B135 4 10 - 13 12 - 14 Operating: 0
Pressure sensor B136 21 1 - 4 1 - 4 When ignition switch is turned to ON: atmospheric pressure
Vacuum pump B137 27 10 - 13 12 - 14 Operating: 0
Ground (engine 1) B134 6 0 0 -
Ground (engine 2) B134 4 0 0 -
Ground (engine 3) B134 3 0 0 -
Ground (engine 4) B137 1 0 0 -
Ground (engine 5) B137 3 0 0 -
Ground (body) B136 4 0 0 -
scientia non olet · About LEMON Manuals