Section 07-07: Transfer Case, 4x4 System, Service
1996 F-150, 250, 350 (4x4), and Bronco Vehicles with Manual Shift Transfer Case; All Bronco and F-150 4x4 Vehicles with Electronic Shift Transfer Case Only Workshop Manual
DIAGNOSIS AND TESTING

Symptom Chart Transfer Case, 4X4 System

NOTE: Use Rotunda 73 Digital Multimeter 105-R0051 or equivalent to perform electrical pinpoint tests.

SYMPTOM CHART TRANSFER CASE, 4X4 SYSTEM
ConditionPossible SourceAction
  • Power and Grounds
  • Bad or intermittent power to control module.
  • Faulty control module ground.
  • Electronic 4WD Indicator Lamp Inoperative
  • Electronic 4WD lamp not functioning properly.
  • Electronic 4WD lamp open or shorted.
  • Brake Switch Input
  • Stoplamp operation.
  • Bad or intermittent brake switch input.
  • Park/Neutral Position Switch or Transmission Range Sensor Inoperative, Will Not Start
  • Control module to park/neutral position open.
  • Faulty park/neutral position switch failure.
  • Transmission range sensor failure.
  • Transfer Case Speed Sensors Diagnosis
  • Speed sensor power supply.
  • Continuity testing of the speed sensor lines.
  • Short-to-ground testing of speed sensor lines.
  • Transfer Case Clutch Diagnosis
  • Bad or intermittent power to clutch.
  • Clutch circuit short-to-ground.
  • Continuity testing of clutch circuit.