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.
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HOMESERVICE MANUALSSUBARU1997IMPREZA L, 2D COUPE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSCOMPUTERIZED ENGINE CONTROLSELECTRONIC CONTROL MODULE (ECM)GROUND CIRCUITS
1997 Subaru Impreza L, 2D Coupe, Standard
Ground Circuits
1997 Subaru Impreza L, 2D Coupe, StandardSECTION Ground Circuits
- Turn ignition off. Using ohmmeter connected to ground, backprobe each ECM ground terminal. See ECM GROUND TERMINAL IDENTIFICATION table. Resistance should be zero ohms. If resistance is not close to zero ohms, repair open to ground.
- Start engine. Using voltmeter connected to ground, backprobe each ground terminal. Voltage should be less than one volt. If voltage is greater than one volt, check for open, corrosion, or loose connection on ground lead.
ECM GROUND TERMINAL IDENTIFICATION
| Application/Terminal No. | Wire Color | ||
|---|---|---|---|
| 17 | (1) | ||
| 18 | (1) | ||
| 19 | (1) | ||
| 20 | (1) | ||
| 42 | (1) | ||
| 46 | (1) | ||
| 69 | (1) | ||
| 94 | (1) | ||
| 95 | (1) | ||
|
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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.