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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1810 (Transfer Case - Four Wheel Drive (4WD) Systems - F-150 & Mark LT) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - Mechanical Shift >> Symptom Chart

Symptom Chart

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Symptom Chart

Condition Possible Sources Action
  • No communication with the four wheel drive (4WD) control module (PCM)
  • Scan tool
  • Data link connector (DLC)
  • 4WD control module (PCM)
  • Circuitry
  • The instrument cluster 4L and 4H indicators do not operate correctly/do not operate
  • Instrument cluster
  • Circuitry
  • 4WD control module (PCM)
  • Ignition switch
  • The vehicle does not shift between two wheel drive (2WD) and 4WD modes correctly
  • Transfer case shift lever
  • Mode indication switch
  • IWE
  • 4WD control module (PCM)
  • Transfer case
  • Circuitry
  • The vehicle does not shift between 4H and 4L modes correctly
  • Transfer case
  • Mode indication switch
  • Transfer case shift lever
  • 4WD control module (PCM)
  • Transmission drag torque
  • The 4WD does not engage at speed correctly
  • Transfer case clutch coil
  • 4WD control module (PCM)
  • IWE
  • Ignition switch
  • The front axle does not engage/disengage correctly/makes noise in 2H under heavy throttle
  • Mode indication switch
  • IWE
  • IWE solenoid
  • Vacuum leaks
  • 4WD control module (PCM)
 
  • Front halfshaft
  • Ignition switch
  • The 4WD system jumps out of gear
  • Transfer case
  • Transfer case shift lever
  • IWE vent
  • Straightline driveline wind-up
  • Tire inflation pressure
  • Tire and wheel size
  • Tire wear
  • Axle ratio
  • Grinding noise during 4WD engagement, especially at high speeds
  • Front halfshafts not turning at the same speed
  • Flashing 4L and 4H indicators 3 times every 2 minutes
  • Loss of CAN communication between 4WD control module (PCM) and instrument cluster
 
  • No communication with the 4WD control module (PCM)
  • Ignition switch
  • 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 - 4R70E/4R75E article. If there is noise in all gears, DISASSEMBLE the transfer case. REFER to TRANSFER CASE article. CHECK the planetary gears, the bearings, the upper and lower drive sprockets and drive chain for damage. INSTALL new parts as necessary. TEST the system for normal operation.
 
  • Fluid level
  • FILL with automatic transmission fluid. REFER to TRANSFER CASE article.
  • Unable to duplicate customer concern
  • 4WD system and/or related components
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