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Home >> Subaru >> 2009 >> Legacy R >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Engine (Diagnostics) (H6DO) >> Engine Control Module (ECM) I/O Signal >> Electrical Specification
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Electrical Specification

Fig 1: Identifying Engine Control Module (ECM) Connectors Terminals
G05334606Courtesy of SUBARU OF AMERICA, INC.
ENGINE CONTROL MODULE REFERENCE

Description Connector No. Terminal No. Signal (V) Reference
Ignition SW ON (engine OFF) Engine ON (idling)
Crankshaft position sensor Signal (+) B134 13 0 -7 - +7 Waveform
Signal (-) B134 14 0 0 -
Shield B134 24 0 0 -
Camshaft position sensor(LH) Signal B134 21 0.275 0 or 5 Waveform
Ground B134 22 0 0 -
Camshaft position sensor (RH) Signal B134 11 0.275 0 or 5 Waveform
Ground B134 22 0 0 -
Electronic throttle control Main B134 18 0.64 - 0.94
Fully opened: 4.01		 0.64 - 0.72 (After engine is warmed up.) Fully closed: 0.6
Fully opened: 4.01
Sub B134 28 1.51 - 1.76
Fully opened: 4.23		 1.51 - 1.58 (After engine is warmed up.) Fully closed: 1.48
Fully opened: 4.23
Electronic throttle control motor (+) B137 5 Duty waveform Duty waveform Drive frequency: 500 Hz
Electronic throttle control motor (-) B137 4 Duty waveform Duty waveform Drive frequency: 500 Hz
Electronic throttle control motor power supply B136 1 10 - 13 12 - 14 -
Electronic throttle control motor relay B136 21 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 When ignition switch is turned to ON: ON
EGR valve Signal A+ B134 8 10 - 13 12 - 14 -
Signal A- B134 9 10 - 13 12 - 14 -
Signal B+ B134 10 10 - 13 12 - 14 -
Signal B- B134 20 10 - 13 12 - 14 -
Accelerator pedal position sensor Main sensor signal B135 23 Fully closed: 1
Fully opened: 3.6		 Fully closed: 1
Fully opened: 3.3		 -
Main power supply B135 21 5 5 -
Ground (main sensor) B135 29 0 0 -
Sub sensor signal B135 31 Fully closed: 1
Fully opened: 3.7		 Fully closed: 1
Fully opened: 3.3		 -
Sub power supply B135 22 5 5 -
Ground (sub sensor) B135 30 0 0 -
Engine coolant temperature sensor B134 34 1.0 - 1.4 1.0 - 1.4 After engine is warmed up.
Starter switch B136 32 0 0 Cranking: 8 - 14
Starter relay B136 20 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 -
A/C switch B136 24 ON: 10 - 13
OFF: 0		 ON: 12 - 14
OFF: 0		 -
A/C lock sensor B135 14 Duty waveform Duty waveform Auto A/C model
A/C middle pressure switch B136 33 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 -
Ignition switch B135 19 10 - 13 12 - 14 -
Neutral position switch B136 31 ON: 0
OFF: 12±0.5		 Switch is ON when select lever is shifted into "P" range or "N" range.
Delivery (test) mode connector B135 27 12 - 14 12 - 14 When connected: 0
Knock sensor 1 Signal B134 15 2.4 2.4 -
Shield B134 25 0 0 -
Knock sensor 2 Signal B134 16 2.4 2.4 -
Shield B134 25 0 0 -
Back-up power supply B135 5 10 - 13 12 - 14 Ignition switch "OFF": 10 - 13
Control module power supply B135 2 10 - 13 12 - 14 -
B134 7 10 - 13 12 - 14 -
Sensor power supply B134 19 5 5 -
Ignition control #1 B137 18 0 0 - 14 Waveform
#2 B137 19 0 0 - 14 Waveform
#3 B137 20 0 0 - 14 Waveform
#4 B137 21 0 0 - 14 Waveform
#5 B137 22 0 0 - 14 Waveform
#6 B137 23 0 0 - 14 Waveform
Fuel injector #1 B137 8 10 - 13 1 - 14 Waveform
#2 B137 9 10 - 13 1 - 14 Waveform
#3 B137 10 10 - 13 1 - 14 Waveform
#4 B137 11 10 - 13 1 - 14 Waveform
#5 B137 12 10 - 13 1 - 14 Waveform
#6 B137 13 10 - 13 1 - 14 Waveform
A/C relay control B136 9 ON: 0.5 or less
OFF: 10 - 13		 ON: 0.5 or less
OFF: 12 - 14		 -
Blower fan switch B135 16 ON: 0
OFF: 10 - 13		 ON: 0
OFF: 12 - 14		 Manual A/C model
Radiator fan control B136 18 ON: 0.5 or less
OFF: 10 - 13		 ON: 0.5 or less
OFF: 12 - 14		 -
Radiator fan control power supply B136 29 ON: 0.5 or less
OFF: 10 - 13		 ON: 0.5 or less
OFF: 12 - 14		 -
Self-shutoff control B136 23 0 0 -
Malfunction indicator light B136 11 - - Light "ON": 1 or less
Light "OFF": 10 - 14
Engine speed output B136 22 - 0 - 13 or more Waveform
Purge control solenoid valve B137 29 ON: 1 or less
OFF: 10 - 13		 ON: 1 or less
OFF: 12 - 14		 -
Power steering switch B134 33 ON: 1 or less
OFF: 10 - 13		 ON: 1 or less
OFF: 12 - 14		 -
Manifold absolute pressure sensor B134 6 3.5 - 4.8 1.1 - 1.9 -
Air flow sensor Signal B135 26 0.74 0.3 - 4.5 -
Shield B135 35 0 0 -
Ground B135 34 0 0 -
Intake air temperature sensor B135 18 3.15 - 3.33 3.15 - 3.33 Intake air temperature: 25°C (77°F)
Front oxygen (A/F) sensor RH Signal (+) B135 9 2.8 - 3.2 2.8 - 3.2 -
Signal (-) B135 8 2.4 - 2.7 2.4 - 2.7 -
Shield B135 1 0 0 -
Front oxygen (A/F) sensor heater RH Signal 1 B136 3 12 - 14 - Waveform
Signal 2 B136 2 12 - 14 - Waveform
Front oxygen (A/F) sensor LH Signal (+) B135 11 2.8 - 3.2 2.8 - 3.2 -
Signal (-) B135 10 2.4 - 2.7 2.4 - 2.7 -
Shield B135 1 0 0 -
Front oxygen (A/F) sensor heater LH Signal 1 B135 7 12 - 14 - Waveform
Signal 2 B135 6 12 - 14 - Waveform
Rear oxygen sensor RH Signal B135 4 0 0 - 0.9 -
Shield B135 1 0 0 -
Rear oxygen sensor heater RH signal B136 4 12 - 14 - Waveform
Rear oxygen sensor LH Signal B135 15 0 0 - 0.9 -
Shield B135 1 0 0 -
Rear oxygen sensor heater LH signal B136 5 12 - 14 - Waveform
Immobilizer communication 1 B136 26 10 10 -
Immobilizer communication 2 B136 34 10 10 -
Fuel pump control unit Signal 1 B135 33 0 12 - 14 -
Signal 2 B136 12 0 0 or 5 -
Brake switch 1 B135 20 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 B135 28 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 B135 24 When not operating: 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 not operating: 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 B135 12 ON: 0
OFF: 5		 ON: 0
OFF: 5		 -
Oil flow control solenoid valve RH Signal (+) B137 17 0 0.6 -
Signal (-) B137 16 0 0 -
Oil flow control solenoid valve LH Signal (+) B137 15 0 0.6 -
Signal (-) B137 14 0 0 -
Oil switching solenoid valve RH Signal (+) B137 25 0 1.9 -
Signal (-) B137 24 0 0 -
Oil switching solenoid valve LH Signal (+) B137 31 0 1.9 -
Signal (-) B137 30 0 0 -
Oil temperature sensor signal B134 23 1.0 - 1.4 1.0 - 1.4 After engine is warmed up.
Variable valve lift diagnosis oil pressure switch RH B134 31 0 0 -
Variable valve lift diagnosis oil pressure switch LH B134 32 0 0 -
Generator control B136 10 0 - 6.5 0 - 6.5 -
SSM communication line B136 16 1 or less ↔ 4 or more 1 or less ↔ 4 or more -
Clutch switch B136 25 10 - 13 12 - 14 -
GND (sensor) B135 30 0 0 -
Ground (ignition system) (Ignition 1) B137 26 0 0 -
(Ignition 2) B137 6 0 0 -
Ground Engine 1 B134 5 0 0 -
Engine 2 B137 7 0 0 -
Engine 3 B137 2 0 0 -
Engine 4 B137 1 0 0 -
Engine 5 B137 3 0 0 -
Engine 6 B134 3 0 0 -
Body B136 6 0 0 -
Sensor GND (engine side) B134 29 0 0 -
Fuel tank pressure sensor B135 32 2.3 2.7 -
Pressure control solenoid valve B136 28 ON: 1 or less
OFF: 10 - 13		 ON: 1 or less
OFF: 12 - 14		 -
Drain valve B136 17 ON: 1 or less
OFF: 10 - 13		 ON: 1 or less
OFF: 12 - 14		 -
Fuel temperature sensor B135 17 2.5 - 3.8 2.5 - 3.8 Ambient temperature: 25°C (77°F)
CAN communication (+) B136 27 2.0 - 4.5 2.0 - 4.5 Waveform
CAN communication (-) B136 35 0.5 - 3.0 0.5 - 3.0 Waveform
WAVEFORM REFERENCE

Input/output name Measuring condition Waveform
1. Crankshaft position sensor At idling
G05341539Courtesy of SUBARU OF AMERICA, INC.
2. Camshaft position sensor At idling
G05341540Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Engine Control Module (ECM) I/O Signal - Wiring Diagram (1 Of 5)
G06336660Courtesy of SUBARU OF AMERICA, INC.
Fig 3: Engine Control Module (ECM) I/O Signal - Wiring Diagram (2 Of 5)
G06336661Courtesy of SUBARU OF AMERICA, INC.
Fig 4: Engine Control Module (ECM) I/O Signal - Wiring Diagram (3 Of 5)
G06336662Courtesy of SUBARU OF AMERICA, INC.
Fig 5: Engine Control Module (ECM) I/O Signal - Wiring Diagram (4 Of 5)
G06336663Courtesy of SUBARU OF AMERICA, INC.
Fig 6: Engine Control Module (ECM) I/O Signal - Wiring Diagram (5 Of 5)
G06336664Courtesy of SUBARU OF AMERICA, INC.
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