Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR RELATED DTCS
1. With the scan tool, check for other transmission DTCs
2. If any of these DTCs are present, perform their respective tests first.
  Are there any Transmission solenoid, line pressure, speed sensor, and/or loss of prime DTCs present?
  
  Yes
  - If any of these DTCs are present, they may cause a Speed Ratio Error. Perform the test for P0944 first if it is present. Refer to Diagnosis and Testing .
  No
  - Go To 2.
CHECK THE EVENT DATA
1. With the scan tool, read and record the Event Data.
  NOTE:
  Make sure to record all Event Data stored in the scan tool for future reference in this test procedure.
  
  Does the Event Data display information for the DTC P0729?
  
  Yes
  - Go To 4.
  No
  - Go To 3.
CHECK THE TARGET GEAR
In the Event Data recorded earlier, does the Event Data show the DTC P1790, with Target gear = 6th, or with both the 2C and OD clutches applying?

Yes
- Go To 4.
No
- Go To 6.
CHECK INPUT RPM
In the Event Data recorded earlier, does the Input RPM read zero?

Yes
- Perform the diagnostic procedure for P0716-Input Speed Sensor Circuit Performance. Diagnose the DTC as if it is set and current. Refer to Diagnosis and Testing .
No
- Go To 5.
CHECK LINE PRESSURE READING
In the Event Data recorded earlier, is the line pressure reading more than 10 psi below the desired line pressure reading?

Yes
- Remove the Transmission Oil pan and check the Transmission Oil filter for improper installation or plugged, if Primary oil filter is OK, check the main regulator valve in pump. If excessive debris is in the oil pan, check clutches and repair as necessary. Refer to the Service Information for proper repair procedures.
- Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST .
No
- Go To 6.
CHECK TRANSMISSION FOR SLIPPAGE
1. Erase DTCs and road test the vehicle.
2. Check the transmission operation in reverse and all forward gears.
  During the road test, was there any obvious slippage noted in any gear, or did the transmission fail to make a 1-2 upshift?
  
  Yes
  - Go To 8.
  No
  - Go To 7.
CHECK IF THE DTC RESETS
1. With the scan tool, check for Transmission DTCs after the road test.
  Did the DTC P0729 reset?
  
  Yes
  - Go To 8.
  No
  - Test Complete.
  - Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST .
CHECK INTERNAL TRANSMISSION
1. Remove the Transmission Oil Pan and Valve Body, in accordance with the Service Information, and check for the following:
  - Excessive clutch and or metal debris in the oil pan.
  - If the accumulator cover is intact and the 2C tower seal is not cut or split.
  - OD and 2C accumulator pistons for cracks or cut seals.
  - Solenoid Switch Valve and its plugs for stickiness or wear.
  - Cut or missing No. 5, No. 6, or No. 7 check ball.
  - OD bleed orifice (on top of the main valve body) is intact.
  - Air check the OD and 2C hydraulic clutch circuits for excessive leakage. Refer to the Service information.
  NOTE:
  Both the OD and 2C hydraulic clutch circuits contain a small bleed orifice. A small amount of air leakage is considered normal. The OD hydraulic clutch circuit bleed orifice connects to the Reverse input clutch hydraulic cavity. A small amount of air leakage into the Reverse hydraulic clutch circuit is considered normal.
  
  Were there any problems found?
  
  Yes
  - Repair as necessary. Refer to the Service Information for proper repair procedures.
    NOTE:
    If the OD or 2C clutch has failed but no obvious cause is found (such as a cut piston seal, broken seal ring, stuck regulator valve or any other items listed above) replace the Transmission Solenoid/TRS Assembly in addition to any necessary internal repairs.
  - Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 9.
CHECK ROAD TEST RESULTS
During the road test, were Reverse, 1st, 2nd, and 3rd gears OK, but the transmission slipped in 4th, 5th, and 6th gears?

Yes
- Go To 10.
No
- Go To 11.
CHECK THE OD SHAFT AND REVERSE CARRIER SPLINE
1. Remove the Transmission in accordance with the Service Information and inspect the OD shaft and its spline to the reverse carrier hub.
  Were there any problems found?
  
  Yes
  - Repair as necessary. Refer to the Service Information for proper repair procedures.
  - Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST .
  No
  - Disassemble and inspect the input clutch assembly. Check the OD and Reverse clutch seals, discs, and bleed orifice (in the OD/Reverse clutch piston) and repair as necessary in accordance with the Service Information.
    NOTE:
    If the OD clutch has failed but no obvious cause is found (such as a cut piston seal, broken seal ring, stuck regulator valve, etc.), replace the Transmission Solenoid/TRS Assembly in addition to any other necessary repairs.
  - Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST .
CHECK FOR FAILED REVERSE GEARSET SPLINES
Working through the windows in the bottom of the case, check for a failed Reverse Sun or Annulus gear spline as follows:
1. Hold the Transmission Output Shaft by holding the Transmission Manual Lever in the park position.
2. Apply the 4C clutch using 30-40 psi shop air at the apply port in the center bulkhead.
3. Attempt to rotate the input annulus gear and drive shell (the drum that encloses the two rearmost gearsets).
NOTE:
Due to the overrunning clutch, the gear and drive shell normally rotates in one direction only.

Can the drive shell be rotated?

Yes
- Repair internal transmission as necessary in accordance with the Service Information. Check the reverse annulus gear spline to the input carrier, and the reverse sun gear spline to the reaction carrier hub.
- Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST .
No
- Replace Transmission Solenoid/TRS Assembly in accordance with the Service Information and perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST .
  NOTE:
  If continued slippage is noted in 2nd and/or 6th gear during the verification test, remove the transmission and inspect the 2C clutch and repair as necessary in accordance with the Service Information.