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Home >> Lincoln >> 2002 >> Navigator RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 266 (Four Wheel Drive Systems) >> Diagnosis And Testing >> Functional Test -Electronic Shift >> Symptom Chart

Symptom Chart

WARNING: This page is about a different car, the 2003 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM CHART

Condition Possible Sources Action
The vehicle does not operate correctly in A4WD and 4WD HIGH modes
  • Central junction box (CJB) fuses:
    • 11 (10A).
    • 115 (30A).
    • 20 (30A).
  • Mode select switch (MSS).
  • Transfer case shaft speed sensors.
  • Transfer case electric clutch.
  • 4WD control module.
  • Powertrain control module (PCM).
  • IVD.
  • IWE solenoid.
  • Circuitry.
 Go To PINPOINT TEST B  .
No communication with the 4WD control module
  • Central junction box (CJB) fuses:
    • 115 (30A).
    • 20 (30A).
  • 4WD control module.
  • 4WD control module connectors.
  • Circuitry.
 Go To PINPOINT TEST C  .
The vehicle does not shift between 4X4AUTO/4WD HIGH and 4WD LOW modes correctly
  • Central junction box (CJB) fuses:
    • 11 (10A).
    • 115 (30A).
    • 20 (30A).
  • Mode select switch (MSS).
  • Gearmotor encoder contact plate A, B, C, or D.
  • Gearmotor encoder assembly.
  • Circuitry.
  • 4WD control module.
  • Transfer case internal mechanism.
  • Transfer case shift motor.
  • Digital TR sensor.
  • BPP switch.
  • IVD.
  • IWE solenoid.
  • 4WABS control module.
  • Instrument cluster.
  • PCM.
 Go To PINPOINT TEST D  .
The transfer case makes noise
  • Tire inflation pressure.
  • Tire and wheel size.
 MAKE SURE that all tires and wheels are the same size and that the inflation pressures are correct.
  • Tire tread wear.
 CHECK tire tread wear to see if there is more than 0.15 mm (0.06 in) difference in tread wear between front and rear. INTERCHANGE one front wheel and one rear wheel. ROAD TEST again.
  • Internal components.
 OPERATE the vehicle in all transmission gears. If there is noise in the transmission in NEUTRAL, or in some gears and not in others, REMOVE and REPAIR the transmission. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION-4R70W . If there is noise in all gears, DISASSEMBLE the transfer case. REFER to TRANSFER CASE - AUTOMATIC SHIFT . CHECK the planetary gears, bearings, upper and lower drive sprockets and drive chain for damage. INSTALL new parts as necessary.
  • Fluid level.
 FILL with automatic transmission fluid. REFER to TRANSFER CASE - AUTOMATIC SHIFT .
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