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.
2018 Subaru WRX STIFACTORY OEM SERVICE PROCEDURE
Active Test: Operation: Engine
NOTE:
For detailed operation procedures, refer to "Application help".
| Active test items | Contents | Execution condition | ||
|---|---|---|---|---|
| Fuel Pump Relay | ON/OFF of the fuel pump can be set. | Ignition switch is ON (engine OFF) | ||
| CPC Solenoid Valve | ON/OFF of the purge control solenoid valve can be set. | |||
| Radiator Fan Relay | ON/OFF of the radiator fan relay can be set. | |||
| A/C Compressor Relay | ON/OFF of the A/C relay can be set. | |||
| Turbocharger Wastegate Solenoid | Wastegate control solenoid valve can be set between 0% ↔ 99.6%. | |||
| Secondary Air Combi Valve 1 | ON/OFF of the secondary air combination valve relay 1 can be set. | |||
| Secondary Air Combi Valve 2 | ON/OFF of the secondary air combination valve relay 2 can be set. | |||
| Secondary Air Pump Relay | ON/OFF of the secondary air pump relay can be set. | |||
| CPC Solenoid 2 | ON/OFF of the purge control solenoid valve 2 can be set. | |||
| ELCONTROL MODULE switching valve | ON/OFF of the leak check valve assembly switching valve can be set. | |||
| ELCONTROL MODULE pump | ON/OFF of the leak check valve assembly vacuum pump can be set. | |||
| Fuel Pump Control (OFF Drive) | Fuel pump can be set to OFF. | At idling | ||
| Fuel Pump Control (ON/OFF Dr.) | ON/OFF of the fuel pump can be set. | |||
| Fixed Idle Ignition Timing | Idle ignition timing can be set and fixed to 10°. | |||
| Idle Speed Control | Idle speed can be set to 500 - 2000 rpm. | |||
| Injection Stop Mode (Injector 1) Injection Stop Mode (Injector 2) Injection Stop Mode (Injector 3) Injection Stop Mode (Injector 4) |
Injector of each cylinder can be set to stop the fuel injection. | |||
| Injection Quantity Control | The amount of fuel injection can be set to 0 - 20%. | |||
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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