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CONDITION POSSIBLE CAUSES CORRECTION DRAGS OR LOCKS UP 1. Fluid Level Low. 1. Check and adjust level. 2. Clutch Dragging/Failed 2. Air pressure check clutch operation and 3. Front or Rear Band Mis-adjusted. 3. Adjust bands. 4. Case Leaks Internally. 4. Check for leakage between passages in 5. Servo Band or Linkage Malfunction. 5. Air pressure check servo operation and 6. Overrunning Clutch Worn. 6. Remove and inspect clutch. Repair as 7. Planetary Gears Broken. 7. Remove, inspect and repair as required 8. Converter Clutch Dragging. 8. Check for plugged cooler. Perform flow NO 4-3 DOWNSHIFT 1. Circuit Wiring and/or Connectors 1. Test wiring and connectors with test lamp 2. PCM Malfunction. 2. Check PCM operation with DRB T scan tool. Replace PCM only if faulty. 3. TPS Malfunction 3. Check TPS with DRB T scan tool at PCM. 4. Lockup Solenoid Not Venting. 4. Remove valve body and replace solenoid 5. Overdrive Solenoid Not Venting. 5. Remove valve body and replace solenoid if 6. Valve Body Valve Sticking. 6. Repair stuck 3-4 shift valve or lockup NO 4-3 DOWNSHIFT WHEN 1. Control Switch Open/Shorted. 1. Test and replace switch if faulty. 2. Overdrive Solenoid Connector 2. Test solenoids and replace if seized or 3. PCM Malfunction. 3. Test with DRB T scan tool. Replace PCM if faulty. 4. Valve Body Stuck Valves. 4. Repair stuck 3-4, lockup or lockup timing CLUNK NOISE FROM 1. Transmission Fluid Low. 1. Add Fluid. 2. Throttle Cable Mis-adjusted. V-10 2. Adjust cable. 3. Overdrive Clutch Select Spacer 3. Replace overdrive piston thrust plate 21 - 988 AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION DR/DH |