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.
Control Unit Ground Circuits
1991 Ford Probe GL, StandardSECTION Control Unit Ground Circuits
- On Probe 2.2L turbo and 2.2L non-turbo (ATX), use an ohmmeter to check for continuity to ground on ECA terminals 3A, 3B and 3C. On all other models, check for continuity to ground on ECA terminals 2A, 2B and 2C. See Figure . Resistance should be zero ohm. If resistance is not zero ohm, repair open to ground.
- Using a DVOM, touch negative lead of voltmeter to a good ground. Touch positive lead of voltmeter to each ground terminal. With vehicle running, voltmeter should indicate less than 1 volt. If voltage is greater than 1 volt, check for open, corrosion or loose connection on ground lead.
RENDER: 1.0x
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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.