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 MANUALSFORD1988BRONCO 4.9 Y, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDECELERATION CONTROL SYSTEMTESTINGELECTRONIC SPEED SENSOR MODULE TEST
1988 Ford Bronco 4.9 Y, Automatic
Electronic Speed Sensor Module Test
1988 Ford Bronco 4.9 Y, AutomaticSECTION Electronic Speed Sensor Module Test
- Number harness terminals from 1 to 6 (or 8), starting with terminal No. 1 nearest the locator key. With ignition on, connect negative voltmeter lead to ground and touch positive lead, in turn, to terminals No. 1, 4, and 6. Battery voltage should be indicated at terminals No. 1 and 4. Terminal No. 6 should be 6-8 volts.
- If voltage is less than 6 volts, service harness as necessary. If all tests are satisfactory, and problem still remains, replace electronic speed sensor module.
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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.