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 MANUALSMERCURY1982CAPRI L6-200 3.3LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVEHICLE SPEED SENSORTESTING AND INSPECTIONSPEED SIGNAL TEST
1982 Mercury Capri L6-200 3.3L
Speed Signal Test
1982 Mercury Capri L6-200 3.3LSECTION Speed Signal Test
Speed signal test:
Electronic Instrument Cluster Only
1. With wheels raised and vehicle speed at 30 m.p.h., measure the AC voltage of the speed signal at the speed control amplifier connector, Fig. 10.
2. If reading obtained is less than 6 volts, disconnect speed control amplifier and repeat measurement.
a. If voltage is greater than 6 volts, replace speed control amplifier and retest.
b. If voltage obtained is less than 6 volts, check circuit 150 back to speedometer stud on the cluster for an open or short. If circuit is satisfactory, replace speedometer electronics and retest. If an open or short exists, repair as necessary.
3. If reading obtained is more than 6 volts, measure the DC component at the speed control module.
a. If voltage obtained is greater than 1 volt, replace speedometer electronics and retest.
b. If voltage obtained is 1 volt, speedometer circuit is satisfactory. Proceed with ``Speed Control Diagnosis.''
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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.