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Home >> Ford >> 1996 >> Aerostar Van Window >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Anti-Lock Brake System - Rear >> Diagnosis >> Symptom Diagnosis >> Symptom "A" - Unwarranted RABS Activity

Symptom "A" - Unwarranted RABS Activity

  1. If a premature loss of speed sensor signal during deceleration is suspected, check for:
    • Metal chips on pole piece.
    • Gap between speed sensor and sensor ring greater than 0.050" (1.27 mm).
    • Gap between speed sensor and sensor ring is less than 0.005" (0.13 mm).
    • Missing or damaged speed sensor ring teeth.
  2. If intermittent speed sensor signal to control module during deceleration is suspected, check for:
    • Intermittent open circuit or short in speed sensor circuit.
    • Intermittent open speed sensor circuit at intermediate connections, especially at firewall.
    • Chafed wire insulation or pinched wire due to improper routing, causing intermittent short.
    • Underhood RABS data link connector shorted.
  3. If misadjusted rear brakes or grabby brake linings are suspected, check for:
    • Rear brake adjustment too tight.
    • Linings are grabby.
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