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Home >> Ford >> 1989 >> Bronco II 4WD, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Testing >> Servo Assembly Test
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Servo Assembly Test

  1. Disconnect cable from throttle body (if equipped). Separate 8-way connector at amplifier. Connect ohmmeter between Orange/Yellow and Gray/Black wires at connector. Resistance of 40-125 ohms should be obtained.
  2. Connect ohmmeter between Orange/Yellow and White/Pink wires at connector. Resistance of about 60-90 ohms should be obtained. Reconnect cable. Start engine with servo-to-amplifier connector disconnected. Verify engine vacuum exceeds 2.5 in. Hg.
  3. With servo disconnected from amplifier, connect Orange/Yellow wire of servo to battery positive terminal. Connect White/Pink wire to ground and momentarily touch Gray/Black wire of servo to ground. Servo throttle actuator should tighten actuator cable and open throttle.
  4. Throttle should remain in that position or slowly release tension. When White/Pink wire is removed from ground, servo should release tension immediately. If servo fails tests, replace servo.
CAUTION: If Orange/Yellow wire is shorted to either White/Pink wire or Gray/Black wire, it may cause damage to amplifier.
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