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HOMESERVICE MANUALSFORD1987THUNDERBIRD BASE, 3.8 3REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSTESTINGSERVO ASSEMBLY
1987 Ford Thunderbird Base, 3.8 3

Servo Assembly

1987 Ford Thunderbird Base, 3.8 3SECTION Servo Assembly
NOTE: If Orange/Yellow lead is shorted to either White/Pink or Gray/Black leads, it may be necessary to replace the amplifier.
  1. Separate servo-to-amplifier connector. Connect an ohmmeter between the Orange/Yellow and Gray/Black wires at the servo connector. Resistance should be 40-125 ohms.
  2. Connect ohmmeter between Orange/Yellow and White/Pink wire leads. Resistance reading should be 60-190 ohms.
  3. Start engine. Connect Orange/Yellow lead of servo connector to battery positive post and White/Pink lead of servo connector to ground. Momentarily touch Grey/Black lead of servo connector to ground.
  4. Servo throttle actuator arm should pull in and engine speed should increase. Arm should hold this position or slowly release. If White/Pink wire is removed from ground, servo should release immediately.
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.