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Home >> Lincoln >> 2004 >> Aviator AWD >> Repair and Diagnosis >> Transmission >> Automatic Transmission >> Diagnosis And Testing >> Special Testing Procedures >> Line Pressure Test >> Line Pressure Diagnosis Chart

Line Pressure Diagnosis Chart

LINE PRESSURE DIAGNOSIS CHART

Test Results Possible Source
High at Idle - All Ranges
  • Wiring Harnesses
  • PC C Boost Valve
  • PC C Solenoid
  • Main Regulator Valve
Low at Idle - All Ranges
  • Low Fluid Level
  • Fluid Inlet
  • Filter/Seal
  • Main Control Body
  • Cross Leaks
  • Gaskets
  • Pump
  • Separator Plate
Low - All Forward Ranges
  • Forward Clutch
  • Main Control
  • Overdrive Servo
  • Intermediate Servo
LOW in Park ONLY
  • Valve Body
LOW in Reverse ONLY
  • Separator Plate
  • Reverse Servo Piston, Cover Seal
  • Reverse Clutch
  • Overdrive Servo
  • Intermediate Servo
  • Valve Body
  • Forward Clutch
LOW in Neutral ONLY
  • Valve Body
  • Overdrive Servo
  • Intermediate Servo
LOW in Overdrive ONLY
  • Forward Clutch
  • Overdrive Servo
  • Intermediate Servo
  • Valve Body
LOW in Drive ONLY (O/D Cancelled)
  • Forward Clutch
  • Overdrive Servo
  • Intermediate Servo
  • Valve Body
LOW in First position
  • Forward Clutch
  • Valve Body
LOW in Second position
  • Intermediate Servo
  • Overdrive Servo
  • Forward Clutch
LOW in Third position
  • Intermediate Servo
  • Overdrive Servo
  • Forward Clutch