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.
1993 Subaru Justy BaseFACTORY OEM SERVICE PROCEDURE
Code 12: Starter Switch
NOTE:
Refer to illustration for ECU connector and terminal identification. See Figure
.
- Disconnect ECU connectors. While cranking engine, measure voltage between ground and ECU connector F120, terminal No. 17 (Black/White wire). If voltage is more than 8 volts, go to next step. If voltage is less than 8 volts, repair starter circuit as necessary.
- Turn ignition off. Measure resistance between ground and ECU connector F119, terminal No. 1 (Brown wire). If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, repair wiring harness between ground and ECU.
- Measure resistance between ground and ECU connector F120, terminal No. 10 (Brown wire). If resistance is less than 10 ohms, replace ECU. If resistance is more than 10 ohms, repair wiring harness between ground and ECU.
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.