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 MANUALSFORD1991PROBE GL, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESINSTRUMENT PANEL - ANALOGTESTINGTURBO BOOST GAUGE TESTINGBOOST SENSOR GROUND CHECK
1991 Ford Probe GL, Standard
Boost Sensor Ground Check
1991 Ford Probe GL, StandardSECTION Boost Sensor Ground Check
- Using an ohmmeter, check for continuity between ground and Black wire at boost sensor 4-pin connector. See IDENTIFYING BOOST SENSOR 4-PIN CONNECTOR illustration. Boost valve connector is located at turbo boost sensor, near center of firewall.
- Observe ohmmeter reading. If continuity exists between Black wire at boost sensor connector and ground, replace boost sensor. If continuity does not exist between Black wire at boost valve connector wire and ground, repair Black wire between boost sensor and ground.
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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.