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.
2015 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Electrical Specification
| Description | Connector No. | Terminal No. | Signal (V) | Note | ||
|---|---|---|---|---|---|---|
| Ignition SW ON (engine OFF) | Engine ON (idling) | |||||
| Crankshaft position sensor | Signal | E158 | 19 | 0 or 5 | 0 or 5 | Waveform |
| Ground | E158 | 31 | 0 | 0 | - | |
| Intake camshaft position sensor (LH) | E158 | 21 | 0 or 5 | 0 or 5 | Waveform | |
| Intake camshaft position sensor (RH) | E158 | 20 | 0 or 5 | 0 or 5 | Waveform | |
| Exhaust camshaft position sensor (LH) | E158 | 33 | 0 or 5 | 0 or 5 | Waveform | |
| Exhaust camshaft position sensor (RH) | E158 | 32 | 0 or 5 | 0 or 5 | Waveform | |
| Camshaft position sensor ground | E158 | 34 | 0 | 0 | - | |
| Front oxygen (A/F) sensor | IP+ signal | E158 | 15 | 1.7 | 3.3 | Waveform |
| VS+ signal | E158 | 27 | 2.2 | 4 | Waveform | |
| COM signal | E158 | 39 | 9.8 | 3.6 | Waveform | |
| Heater signal | E159 | 9 | 12 - 15 | 0 or 12 - 15 | Waveform | |
| Rear oxygen sensor | + signal | E158 | 16 | 2.0 - 3.0 | 2.0 - 3.0 | Waveform |
| - signal | E158 | 42 | ||||
| Heater signal | E159 | 3 | 12 - 15 | 0 or 12 - 15 | Waveform | |
| Air flow sensor | Signal | B134 | 16 | 0.3 | 1.2 | - |
| Ground | B134 | 28 | 0 | 0 | - | |
| Intake air temperature sensor (integrated with air flow sensor) | E158 | 5 | 2.7 | 3 | After engine is warmed up. | |
| Engine coolant temperature sensor | E158 | 38 | 2.7 | 1.8 | After engine is warmed up. | |
| Engine oil temperature sensor | E158 | 2 | 2.9 | 2.1 | After engine is warmed up. | |
| Manifold absolute pressure sensor | E158 | 4 | 1.9 | 0.8 | After engine is warmed up. | |
| Intake air temperature sensor (integrated with manifold absolute pressure sensor) | E158 | 25 | 3 | 3 | After engine is warmed up. | |
| Fuel pressure sensor | E158 | 6 | 2 | 1 | After engine is warmed up. | |
| Knock sensor 1 | E158 | 14 | 2.5 | 2.5 | Waveform | |
| Knock sensor 2 | E158 | 26 | 2.5 | 2.5 | Waveform | |
| Accelerator pedal position sensor | Main power supply | B134 | 30 | 5 | 5 | - |
| Main signal | B134 | 17 | Fully closed: 0.4 - 1.0 Fully opened: 2.4 - 3.7 |
Fully closed: 0.4 - 1.0 | - | |
| Main ground | B134 | 31 | 0 | 0 | - | |
| Sub signal | B134 | 29 | Fully closed: 0.4 - 1.0 Fully opened: 2.4 - 3.7 |
Fully closed: 0.4 - 1.0 | - | |
| Tumble generator valve actuator (LH) | Position signal | E158 | 41 | 2.38 - 3.93 | In closing direction: 0.43 - 1.19 In opening direction: 2.83 - 3.93 |
- |
| Motor open | E159 | 6 | 10 - 13 | 0 or 12 - 15 | Waveform | |
| Motor closed | E159 | 22 | 10 - 13 | 0 or 12 - 15 | Waveform | |
| Tumble generator valve actuator (RH) | Position signal | E158 | 40 | 0.43 - 1.19 | In closing direction: 2.83 - 3.93 In opening direction: 0.43 - 1.19 |
- |
| Motor open | E159 | 14 | 10 - 13 | 0 or 12 - 15 | Waveform | |
| Motor closed | E159 | 30 | 10 - 13 | 0 or 12 - 15 | Waveform | |
| Intake oil control solenoid (LH) | E159 | 15 | 10 - 13 | 0 or 12 - 15 | Waveform | |
| Intake oil control solenoid (RH) | E159 | 7 | 10 - 13 | 0 or 12 - 15 | Waveform | |
| Exhaust oil control solenoid (LH) | E159 | 31 | 10 - 13 | 0 or 12 - 15 | Waveform | |
| Exhaust oil control solenoid (RH) | E159 | 23 | 10 - 13 | 0 or 12 - 15 | Waveform | |
| Wastegate control solenoid valve | E159 | 11 | 10 - 13 | 12 - 15 | - | |
| Canister purge control solenoid valve 1 | E159 | 4 | 10 - 13 | 0 or 12 - 15 | Waveform | |
| Canister purge control solenoid valve 2 | E159 | 12 | 10 - 13 | 0 or 12 - 15 | Waveform | |
| Ignition control | #1 | E159 | 8 | 0 | 0 or 5 | Waveform |
| #2 | E159 | 16 | 0 | 0 or 5 | Waveform | |
| #3 | E159 | 24 | 0 | 0 or 5 | Waveform | |
| #4 | E159 | 32 | 0 | 0 or 5 | Waveform | |
| EGR control valve | A+ | E159 | 5 | 10 - 13 | 0 or 12 - 15 | - |
| A- | E159 | 21 | 10 - 13 | 0 or 12 - 15 | - | |
| B+ | E159 | 13 | 10 - 13 | 0 or 12 - 15 | - | |
| B- | E159 | 29 | 10 - 13 | 0 or 12 - 15 | - | |
| Fuel pump control unit | Control signal | B134 | 40 | 10 - 13 | 0 or 12 - 15 | Waveform |
| Diagnostic signal | B134 | 44 | 0 | 12 - 15 | - | |
| High-pressure fuel pump (Hi) | E158 | 10 | 2.4 - 2.5 | 0 or 12 - 15 | Waveform | |
| High-pressure fuel pump (Lo) | E158 | 22 | 2.4 - 2.5 | 0 | Waveform | |
| Fuel injector | Power supply 1 | B134 | 36 | 10 - 13 | 12 - 15 | - |
| Power supply 2 | B134 | 48 | 10 - 13 | 12 - 15 | - | |
| #1 (+) | E158 | 11 | 0 | - | Measurement is prohibited while the engine is running. | |
| #1 (-) | E158 | 12 | 0 | - | ||
| #2 (+) | E158 | 23 | 0 | - | ||
| #2 (-) | E158 | 24 | 0 | - | ||
| #3 (+) | E158 | 35 | 0 | - | ||
| #3 (-) | E158 | 36 | 0 | - | ||
| #4 (+) | E158 | 47 | 0 | - | ||
| #4 (-) | E158 | 48 | 0 | - | ||
| Electronic throttle control | Sensor power supply | E158 | 18 | 5 | 5 | - |
| Main signal | E158 | 17 | Fully closed: Approx. 0.7 Fully open: Approx. 3.9 |
Fully closed: Approx. 0.7 | After engine is warmed up. | |
| Sub signal | E158 | 29 | Fully closed: Approx. 4.4 Fully open: Approx. 1.1 |
Fully closed: Approx. 4.4 | After engine is warmed up. | |
| Ground | E158 | 30 | 0 | 0 | - | |
| Motor power supply | B134 | 11 | 10 - 13 | 12 - 15 | - | |
| Electronic throttle control motor (+) | E159 | 2 | 0 | 0 or 12 - 15 | - | |
| Electronic throttle control motor (-) | E159 | 1 | 0 | 0 or 12 - 15 | - | |
| Electronic throttle relay control | B134 | 39 | 0 | 0 | - | |
| Starter relay control | B134 | 14 | 2.9 | 2.9 | - | |
| Self-shutoff relay control | B134 | 38 | 0 | 0 | - | |
| Starter cut relay control | B134 | 13 | 0 | 0 | Model with push button start | |
| Main fan relay control | B134 | 37 | 10 - 13 | 0 or 12 - 15 | - | |
| Sub fan relay control | B134 | 25 | 10 - 13 | 0 or 12 - 15 | - | |
| A/C relay control | B134 | 1 | 10 - 13 | 0 or 12 - 15 | - | |
| Starter switch | B134 | 45 | 0 | 0 | Model with push button start Cranking: waveform | |
| Starter switch 2 | B134 | 8 | 0 | 0 | Cranking: 8 - 14 | |
| Ignition switch | B134 | 32 | 10 - 13 | 12 - 15 | - | |
| Pressure switch | B134 | 7 | 10 - 13 | 12 - 15 | - | |
| Neutral position switch | B134 | 33 | ON: 0 OFF: 10 - 13 |
ON: 0 OFF: 12 - 15 |
Switch is ON when select lever is in "P" range or "N" range. | |
| Cruise control | Main switch | B134 | 20 | ON: 0 OFF: 5 |
ON: 0 OFF: 5 |
- |
| Command switch | B134 | 6 | When operating nothing: 3.5 - 4.5 When operating RES/+: 2.5 - 3.5 When operating DISTANCE: 1.5 - 2.5 When operating SET/-: 0.5 - 1.5 When operating CANCEL: 0 - 0.5 |
When operating nothing: 3.5 - 4.5 When operating RES/+: 2.5 - 3.5 When operating DISTANCE: 1.5 - 2.5 When operating SET/-: 0.5 - 1.5 When operating CANCEL: 0 - 0.5 |
- | |
| Clutch switch | B134 | 34 | 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 - 15 |
MT model | |
| Brake switch 1 (brake switch) | B134 | 43 | When brake pedal is depressed: 0 When brake pedal is released: 10 - 13 |
When brake pedal is depressed: 0 When brake pedal is released: 10 - 13 |
- | |
| Brake switch 2 (stop light switch) | E158 | 8 | When brake pedal is depressed: 10 - 13 When brake pedal is released: 0 |
When brake pedal is depressed: 10 - 13 When brake pedal is released: 0 |
- | |
| Oil level switch | E158 | 44 | 0 | 0 | Oil level LOW: 10 - 14 | |
| Accessory cut request | B134 | 2 | 10 - 13 | 12 - 15 | Model with push button start Cranking: 0 | |
| Engine speed output | B134 | 4 | 10 - 13 | 0 or 12 - 15 | Model with push button start Waveform | |
| Generator control | B134 | 26 | 1.8 | 1.8 | After engine is warmed up. | |
| CAN communication | (Hi) | B134 | 10 | - | - | - |
| (Lo) | B134 | 9 | - | - | - | |
| LIN communication | E158 | 3 | - | - | - | |
| Immobilizer communication | E158 | 43 | - | - | - | |
| Delivery mode switch | E158 | 45 | 10 - 13 | 12 - 15 | - | |
| Control module power supply | B134 | 12 | 10 - 13 | 12 - 15 | - | |
| B134 | 24 | 10 - 13 | 12 - 15 | - | ||
| Back-up power supply | B134 | 23 | 10 - 13 | 12 - 15 | - | |
| Sensor power supply | B134 | 18 | 5 | 5 | - | |
| E159 | 19 | 5 | 5 | - | ||
| ELCM | Switching valve | B134 | 27 | 10 - 13 | 12 - 14 | Operating: 0 |
| Pressure sensor | B134 | 15 | 1 - 4 | 1 - 4 | When ignition switch is turned to ON: atmospheric pressure | |
| Vacuum pump | B134 | 3 | 10 - 13 | 12 - 14 | Operating: 0 | |
| Brake booster pressure sensor | E158 | 13 | 0.8 - 1.2 | 1.0 - 1.6 | After engine is warmed up. When brake pedal is released. | |
| Brake vacuum pump | E158 | 1 | 0 | 0 | After engine is warmed up. | |
| Brake vacuum pump relay | E158 | 37 | 10 - 13 | 12 - 15 | After engine is warmed up. | |
| Sensor ground | B134 | 19 | 0 | 0 | - | |
| E159 | 27 | 0 | 0 | - | ||
| Ground | Engine 1 | B134 | 35 | 0 | 0 | - |
| Engine 2 | B134 | 47 | 0 | 0 | - | |
| Engine 3 | E159 | 10 | 0 | 0 | - | |
| Engine 4 | E159 | 18 | 0 | 0 | - | |
| Engine 5 | E159 | 26 | 0 | 0 | - | |
| Engine 6 | E159 | 17 | 0 | 0 | - | |
| Engine 7 | E159 | 25 | 0 | 0 | - | |
Input/output name:
- Crankshaft position sensor
- Intake camshaft position sensor RH
- Intake camshaft position sensor LH
- Exhaust camshaft position sensor RH
- Exhaust camshaft position sensor LH
Measuring condition:
- After warming-up
- At idling
Factory Service Tools
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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.
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