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CONDITION POSSIBLE CAUSES CORRECTION NO 3-4 UPSHIFT 1. O/D Switch In OFF Position. 1. Turn control switch to ON position. 2. Overdrive Circuit Fuse Blown. 2. Replace fuse. Determine why fuse failed 3. O/D Switch Wire Shorted/Open 3. Check wires/connections with 12V test 4. Distance or Coolant Sensor 4. Check with DRB® scan tool and repair 5. TPS Malfunction. 5. Check with DRB® scan tool and replace 6. Neutral Sense to PCM Wire 6. Test switch/sensor as described in 7. PCM Malfunction. 7. Check with DRB® scan tool and replace 8. Overdrive Solenoid Shorted/Open. 8. Replace solenoid if shorted or open and 9. Solenoid Feed Orifice in Valve 9. Remove, disassemble, and clean valve 10. Overdrive Clutch Failed. 10. Disassemble overdrive and repair as 11. Hydraulic Pressure Low. 11. Pressure test transmission to determine 12. Valve Body Valve Stuck. 12. Repair stuck 3-4 shift valve, 3-4 timing 13. O/D Piston Incorrect Spacer. 13. Remove unit, check end play and install 14. Overdrive Piston Seal Failure. 14. Replace both seals. 15. O/D Check Valve/Orifice Failed. 15. Check for free movement and secure 21 - 100 AUTOMATIC TRANSMISSION - 42RE AN AUTOMATIC TRANSMISSION - 42RE (Continued) |