Dodge 2001 Ram 1500 Owner's Manual page 1791

21 - 156 AUTOMATIC TRANSMISSION - 42RE
AUTOMATIC TRANSMISSION - 42RE (Continued)
CONDITION
3-4 UPSHIFT OCCURS
IMMEDIATELY AFTER 2-3
SHIFT
WHINE/NOISE RELATED
TO ENGINE SPEED
NO 3-4 UPSHIFT
POSSIBLE CAUSES
1. Overdrive Solenoid Connector or
Wiring Shorted.
2. TPS Malfunction.
3. PCM Malfunction.
4. Overdrive Solenoid Malfunction.
5. Valve Body Malfunction.
1. Fluid Level Low.
2. Shift Cable Incorrect Routing.
1. O/D Switch In OFF Position.
2. Overdrive Circuit Fuse Blown.
3. O/D Switch Wire Shorted/Open
Cut.
4. Distance or Coolant Sensor
Malfunction.
5. TPS Malfunction.
6. Neutral Sense to PCM Wire
Shorted/Cut.
7. PCM Malfunction.
8. Overdrive Solenoid Shorted/Open.
9. Solenoid Feed Orifice in Valve
Body Blocked.
10. Overdrive Clutch Failed.
11. Hydraulic Pressure Low.
12. Valve Body Valve Stuck.
13. O/D Piston Incorrect Spacer.
14. Overdrive Piston Seal Failure.
15. O/D Check Valve/Orifice Failed.
CORRECTION
1. Test connector and wiring for loose
connections, shorts or ground and repair as
needed.
2. Test TPS and replace as necessary.
Check with DRB scan tool.
3. Test PCM with DRB scan tool and
replace controller if faulty.
4. Replace solenoid.
5. Remove, disassemble, clean and inspect
valve body components. Make sure all
valves and plugs slide freely in bores.
Polish valves with crocus cloth if needed.
1. Add fluid and check for leaks.
2. Check shift cable for correct routing.
Should not touch engine or bell housing.
1. Turn control switch to ON position.
2. Replace fuse. Determine why fuse failed
and repair as necessary (i.e., shorts or
grounds in circuit).
3. Check wires/connections with 12V test
lamp and voltmeter. Repair damaged or
loose wire/connection as necessary.
4. Check with DRB scan tool and repair or
replace as necessary.
5. Check with DRB scan tool and replace
if necessary.
6. Test switch/sensor as described in
service section and replace if necessary.
Engine no start.
7. Check with DRB scan tool and replace
if necessary.
8. Replace solenoid if shorted or open and
repair loose or damaged wires (DRB scan
tool).
9. Remove, disassemble, and clean valve
body thoroughly. Check feed orifice.
10. Disassemble overdrive and repair as
needed.
11. Pressure test transmission to determine
cause.
12. Repair stuck 3-4 shift valve, 3-4 timing
valve.
13. Remove unit, check end play and install
correct spacer.
14. Replace both seals.
15. Check for free movement and secure
assembly (in piston retainer). Check ball
bleed orifice.
BR/BE