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Coast/Tap-Down Function Inoperative

  1. Turn ignition off. Unplug 10-pin connector from servo. While pressing COAST switch, measure resistance between servo harness connector pins for command switch signal and command switch return wire. See SERVO CONNECTOR PIN IDENTIFICATION  table for pin numbers and wire colors. Rotate steering wheel through full range while making measurement. If resistance is 114-126 ohms, switch is okay. Go to next step. If resistance is not 114-126 ohms, replace switch.
  2. Measure resistance between servo harness connector pin for command switch return and ground. See SERVO CONNECTOR PIN IDENTIFICATION  table for pin numbers and wire colors. Rotate steering wheel through full range while making measurement. If resistance is less than one ohm, repair switch return circuit. If is not less than one ohm, temporarily substitute known good servo, then retest system.
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