Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSSUBARU2007IMPREZA BASE, 4D WAGON, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS (DIAGNOSTICS) (H4SO)ENGINE CONTROL MODULE (ECM) I/O SIGNALELECTRICAL SPECIFICATION
2007 Subaru Impreza Base, 4D Wagon, Automatic
Electrical Specification
2007 Subaru Impreza Base, 4D Wagon, AutomaticSECTION Electrical Specification
ECM TERMINAL REFERENCE CHART
| Description | Connector No. | Terminal No. | Signal (V) | Note | ||
|---|---|---|---|---|---|---|
| Ignition SW ON (engine OFF) | Engine ON (idling) | |||||
| Crankshaft position sensor | Signal (+) | B134 | 13 | 0 | -7-+7 | Sensor output waveform |
| Signal (-) | B134 | 14 | 0 | 0 | - | |
| Shield | B134 | 24 | 0 | 0 | - | |
| Rear oxygen sensor | Signal | B135 | 4 | 0 | 0-0.9 | - |
| Shield | B135 | 1 | 0 | 0 | - | |
| GND (sensor) | B134 | 29 | 0 | 0 | - | |
| Front oxygen (A/F) sensor heater | Signal 1 | B136 | 3 | 10-13 | 1-14 | Waveform |
| Signal 2 | B136 | 2 | 10-13 | 1-14 | Waveform | |
| Rear oxygen sensor heater signal | B136 | 4 | 10-13 | 1-14 | Waveform | |
| Engine coolant temperature sensor | Signal | B134 | 34 | 1.0-1.4 | 1.0-1.4 | After engine is warmed-up. |
| GND (sensor) | B134 | 29 | 0 | 0 | After engine is warmed-up. | |
| Vehicle speed signal | B136 | 12 | 0 or 5 | 0 or 5 | "5" and "0" are repeatedly displayed when vehicle is driven. | |
| Air flow sensor | Signal | B135 | 26 | - | 0.3-4.5 | - |
| Shield | B135 | 35 | 0 | 0 | - | |
| GND | B135 | 34 | 0 | 0 | - | |
| Intake air temperature sensor signal | B135 | 18 | 0.3-4.6 | 0.3-4.6 | - | |
| Camshaft position sensor | Signal (+) | B134 | 12 | 0 | -7-+7 | Sensor output waveform |
| Signal (-) | B134 | 22 | 0 | 0 | - | |
| Shield | B134 | 24 | 0 | 0 | - | |
| Starter switch | B136 | 32 | 0 | 0 | Cranking: 8-14 | |
| A/C switch | B136 | 23 | ON: 10-13 OFF: 0 | ON: 12-14 OFF: 0 | - | |
| Ignition switch | B135 | 27 | 10-13 | 12-14 | - | |
| Neutral position switch | B136 | 31 | ON: 0 OFF: 10-13 |
ON: 0 OFF: 12-14 |
- | |
| Test mode connector | B135 | 19 | 10-13 | 12-14 | When connected: 0 | |
| Knock sensor | Signal | B134 | 15 | 2.5 | 2.5 | - |
| Shield | B134 | 25 | 0 | 0 | - | |
| Back-up power supply | B135 | 5 | 10-13 | 12-14 | Ignition switch "OFF": 10-13 | |
| Control module power supply | B134 | 7 | 10-13 | 12-14 | - | |
| B135 | 2 | 10-13 | 12-14 | - | ||
| Ignition control | 1 | B137 | 18 | 0 | 1 - 3.4 | Waveform |
| 2 | B137 | 19 | 0 | 1 - 3.4 | 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 | |
| Fuel pump control relay | B136 | 13 | ON: 0.5 or less OFF: 10 - 13 |
ON: 0.5 or less OFF: 12 - 14 |
- | |
| A/C relay control | B136 | 9 | ON: 0.5 or less OFF: 10 - 13 |
ON: 0.5 or less OFF: 12 - 14 |
- | |
| Radiator fan relay 1 control | B136 | 18 | ON: 0.5 or less OFF: 10 - 13 |
ON: 0.5 or less OFF: 12 - 14 |
- | |
| Radiator fan relay 2 control | B136 | 29 | ON: 0.5 or less OFF: 10 - 13 |
ON: 0.5 or less OFF: 12 - 14 |
Model with A/C only | |
| Starter relay control | B136 | 20 | ON: 0.5 or less OFF: 10 - 13 |
ON: 0.5 or less OFF: 12 - 14 |
- | |
| Self-shut relay control | B136 | 24 | 0.5 or less | 0.5 or less | - | |
| Malfunction indicator light | B136 | 11 | - | - | Light "ON": 1 or less Light "OFF": 10 - 14 |
|
| Engine speed output | B136 | 22 | - | 0 - 13 | Waveform | |
| Purge control solenoid valve | B137 | 29 | ON: 1 or less OFF: 10 - 13 |
ON: 1 or less OFF: 12 - 14 |
Sensor output waveform | |
| Manifold absolute pressure sensor | Signal | B134 | 6 | 3.4 - 3.8 | 1.4 - 1.8 | - |
| GND (sensor) | B134 | 29 | 0 | 0 | ||
| Fuel tank pressure sensor | Signal | B135 | 32 | 2.3 - 2.7 | 2.3 - 2.7 | When the fuel filler cap is reinstalled after removing it, the valve will operate. |
| GND (sensor) | B135 | 30 | 0 | 0 | - | |
| 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 level sensor | B135 | 10 | 0.3 - 4.5 | 0.3 - 4.5 | - | |
| Fuel temperature sensor signal | B135 | 17 | 1 - 4 | 1 - 4 | - | |
| Small light switch | B135 | 15 | ON: 0 OFF: 10 - 13 |
ON: 0 OFF: 12 - 14 |
- | |
| Blower fan switch | B135 | 16 | ON: 0 OFF: 10 - 13 |
ON: 0 OFF: 12 - 14 |
- | |
| Rear defogger switch | B135 | 14 | ON: 0 OFF: 10 - 13 |
ON: 0 OFF: 12 - 14 |
- | |
| Power steering oil pressure switch | B134 | 33 | ON: 1 or less OFF: 10 - 13 |
ON: 0.5 or less OFF: 12 - 14 |
- | |
| Front oxygen (A/F) sensor signal (+) | B135 | 9 | - | 2.7 - 2.9 | - | |
| Front oxygen (A/F) sensor signal (-) | B135 | 8 | - | 2.35 - 2.55 | - | |
| Front oxygen (A/F) sensor shield | B135 | 1 | 0 | 0 | - | |
| SSM/GST communication line | B136 | 16 | 1 or less ↔ 4 or more | 1 or less ↔ 4 or more | - | |
| 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 | - | |
| Ignition 1 | B137 | 26 | 0 | 0 | - | |
| Ignition 2 | B137 | 6 | 0 | 0 | - | |
| Body | B136 | 6 | 0 | 0 | - | |
| Electronic throttle control | Main | B134 | 18 | 0.64 - 0.72 Fully opened: 3.96 |
0.64 - 0.72 (After engine is warmed-up.) |
Fully closed: 0.6 Fully opened: 3.96 |
| Sub | B134 | 28 | 1.51 - 1.58 Fully opened: 4.17 |
1.51 - 1.58 (after engine is warmed-up.) |
Fully closed: 1.48 Fully opened: 4.17 | |
| Power supply | B134 | 19 | 5 | 5 | - | |
| GND (sensor) | B134 | 29 | 0 | 0 | - | |
| 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 | |
| Accelerator pedal position sensor | Main sensor signal | B135 | 23 | Fully closed: 0.7 Fully opened: 3.0 |
Fully closed: 0.7 Fully opened: 3.0 |
- |
| Main power supply | B135 | 21 | 5 | 5 | - | |
| GND (Main sensor) | B135 | 29 | 0 | 0 | - | |
| Sub sensor signal | B135 | 31 | Fully closed: 0.7 Fully opened: 3.0 |
Fully closed: 0.7 Fully opened: 3.0 |
- | |
| Sub power supply | B135 | 22 | 5 | 5 | - | |
| GND (Sub sensor) | B135 | 30 | 0 | 0 | - | |
| Cruise control set light | B135 | 3 | ON: 0 OFF: 10 - 13 |
ON: 0 OFF: 12 - 14 |
- | |
| Main light | B135 | 6 | ON: 0 OFF: 10 - 13 |
ON: 0 OFF: 12 - 14 |
- | |
| Clutch switch | B136 | 25 | When clutch pedal is depressed: 0 When brake pedal is released: 10 - 13 |
When clutch pedal is depressed: 0 When brake pedal is released: 12 - 14 |
- | |
| SET/COAST switch | B135 | 24 | ON: 10 -13 OFF: 0 |
ON: 12 - 14 OFF: 0 |
- | |
| 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 |
- | |
| RESUME/ACC switch | B135 | 13 | ON: 10 - 13 OFF: 0 |
ON: 12 - 14 OFF: 0 |
- | |
| Main switch | B135 | 12 | ON: 10 - 13 OFF: 0 |
ON: 12 - 14 OFF: 0 |
- | |
| CAN communication | Signal (+) | B136 | 27 | Pulse signal | - | |
| Signal (-) | B136 | 35 | Pulse signal | - | ||
| EGR solenoid valve | Signal 1 | B134 | 8 | 0 or 10 - 13 | 0 or 12 - 14 | - |
| Signal 2 | B134 | 9 | 0 or 10 - 13 | 0 or 12 - 14 | - | |
| Signal 3 | B134 | 10 | 0 or 10 - 13 | 0 or 12 - 14 | - | |
| Signal 4 | B134 | 20 | 0 or 10 - 13 | 0 or 12 - 14 | - | |
| Oil switching solenoid valve RH | Signal (+) | B137 | 25 | 0 | Duty waveform | Drive frequency: 300 Hz |
| Signal (-) | B137 | 24 | 0 | 0 | - | |
| Oil switching solenoid valve LH | Signal (+) | B137 | 31 | 0 | Duty waveform | Drive frequency: 300 Hz |
| 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 | - | |
| PCV diagnosis connector | B134 | 30 | 0 | 0 | - | |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.