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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> 545RFE Automatic Transmission - Electrical Diagnostics >> Automatic Transmission 545RFE - Electrical Diagnostics >> DTC Troubleshooting >> P1736-Gear Ratio Error In 2ND Prime >> Diagnostic Test

Diagnostic Test

  1. 1) CHECK IF RELATED DTCS ARE PRESENT 

    With the scan tool, read DTCs.

    Are any Transmission solenoid, line pressure, speed sensor, or loss of prime DTCs present? 

    Yes 

    1. Refer to the DIAGNOSTIC CODE INDEX  table and perform the appropriate symptom. Perform the test for P0944-LOSS OF HYDRAULIC PUMP PRIME  first if it is present.

    No 

    1. Go to  2).
  2. 2) CHECK THE EVENT DATA 

    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 P1736? 

    Yes 

    1. Go to  3).

    No 

    1. Go to  6).
  3. 3) CHECK INPUT RPM IN THE EVENT DATA 

    In the Event Data recorded earlier, does the Input rpm read zero? 

    Yes 

    1. Check the input speed sensor and wiring. Refer to test P0716-INPUT SPEED SENSOR 1 CIRCUIT PERFORMANCE  and diagnose as if the DTC is current.

    No 

    1. Go to  4).
  4. 4) CHECK LINE PRESSURE READING 

    In the Event Data recorded earlier, is the line pressure reading more than 10 psi below the desired line pressure? 

    Yes 

    1. Go to  5).

    No 

    1. Go to  6).
  5. 5) PLUGGED TRANSMISSION OIL FILTER 

    Turn the ignition off to the lock position.

    Remove and inspect the Transmission Oil Pan for excessive debris per the Service Information.

    Remove and inspect the Primary Oil Filter per the Service Information.

    NOTE: Make sure the Primary Transmission Oil Filter and/or seal is not cracked or split.

    Does the Oil Pan contain excessive debris and/or is the Primary Oil Filter cracked or plugged? 

    Yes 

    1. Repair the plugged, cracked, or split Primary Transmission Oil Filter and/or seal. If the Primary Transmission Oil Filter is plugged, refer to the Service Information for the proper hydraulic clutch repair procedure.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .

    No 

    1. Remove the Transmission Oil Pump per the Service Information. Check the main Regulator Valve for sticking in its bore, scoring, and/or damage and clean and repair as necessary. If no problem is found, replace the Transmission Solenoid/TRS Assembly.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .
  6. 6) CHECK IF THE DTC P1736 IS CURRENT 

    With the scan tool, perform the 2nd Prime Gear Clutch Test. Follow the instructions on the scan tool.

    Increase the throttle angle, TPS Degree, to 30° for no more than a few seconds.

    CAUTION: Do not overheat the transmission.
    NOTE: If the 4C clutch is faulty, the overrunning clutch will hold and the slip test will pass. The 2nd Prime Gear Clutch Test will not detect a faulty 4C clutch. However, it will detect a faulty UD clutch.

    Did the clutch test pass, did the Input Speed remain at zero? 

    Yes 

    1. Go to  7).

    No 

    1. Go to  9).
  7. 7) CHECK FOR INTERMITTENT OPERATION 

    Check the Shifter adjustment per the Service Information.

    Intermittent gear ratio DTCs can be set by problems in the Input and Output Speed Sensor circuits and/or Speed Sensor Ground circuit.

    Check the Speed Sensor wiring and connectors for good connection, then perform a wiggle test using the Transmission Simulator, Miller tool #8333.

    Were there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .

    No 

    1. Go to  8).
  8. 8) CHECK FOR SLIPPAGE 

    With the scan tool, erase Transmission DTCs.

    Road test the vehicle.

    During the road test, operate in 4th gear, and perform kickdown shifts from 4th to 2nd (prime) gears.

    Is there an obvious slippage noticed in 4th or 2nd prime gears, or runaway on the 4-2 shift? 

    Yes 

    1. Go to  11).

    No 

    1. Go to  14).
  9. 9) UD CLUTCH HYDRAULIC CIRCUIT 

    Remove Transmission Oil Pan and check for excessive debris.

    Remove the Valve Body and air check the UD clutch hydraulic circuit (in the case) per the Service Information.

    NOTE: The UD clutch passage contains a small bleed orifice, a small amount of air leakage is normal.

    Were there any problems found, excessive debris and/or excessive air leakage in the UD clutch hydraulic circuit? 

    Yes 

    1. Repair as necessary. Check the UD clutch piston seals and the dribbler assembly, reaction shaft support seal rings, and the flatness of the pump valve body and pump housing faces. Check main regulator valve for sticking in the bore.
      NOTE: If the UD 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.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .

    No 

    1. Go to  10).
  10. 10) UD ACCUMULATOR PISTON 

    Check the UD bleed orifice, accumulator piston, and accumulator piston seal in the main valve body.

    Were there any problems found? 

    Yes 

    1. Repair as necessary. Refer to the Service Information for proper repair procedures.

    No 

    1. Replace the Transmission Solenoid/TRS Assembly per the Service Information.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .
  11. 11) EXCESSIVE DEBRIS 

    Remove the Transmission Oil Pan and check for excessive debris.

    Remove the valve body and air check the 4C clutch hydraulic circuit per the Service Information.

    NOTE: The 4C clutch passage contains a small bleed orifice, a small amount of air leakage is normal.

    Were there any problems found, excessive debris, improperly assembled 4C clutch and/or excessive air leakage in the 4C clutch hydraulic circuit? 

    Yes 

    1. Repair as necessary. Refer to the Service Information for proper repair procedures.
      NOTE: Check the 4C piston seals and bleed orifice.
      NOTE: If the 4C 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.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .

    No 

    1. Go to  12).
  12. 12) 4C ACCUMULATOR 

    Check the 4C Accumulator piston for cracks or a cut seal.

    Check for a cut or missing No. 5 check ball.

    Check the Solenoid Switch Valve and its plugs for sticking in its bore or excessive wear.

    Were there any problems found? 

    Yes 

    1. Repair as necessary. Refer to the Service Information for proper repair procedures.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .

    No 

    1. Go to  13).
  13. 13) CHECK FOR BROKEN REVERSE SUN GEAR WELD 

    Working through the windows in the bottom of the case, check for a broken Reverse Sun gear weld to the reaction carrier as follows:

    (1) Hold the Transmission Output Shaft by holding the Transmission Manual Lever in the park position.

    (2) Rotate the Input Annulus gear and drive shell, (the drum that encloses the two rearmost carriers).

    (3) Check to see if the reaction carrier (the front most carrier, whose outer shell is splined to the 4C clutch) is rotating faster than the drive shell is being turned.

    Is the reaction carrier turning faster than the drive shell? 

    Yes 

    1. Replace the Transmission Solenoid/TRS Assembly per the Service Information.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .

    No 

    1. Replace the reaction carrier per the Service Information.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .
  14. 14) CHECK IF THE DTC RESET 

    Did the DTC P1736 reset during the road test? 

    Yes 

    1. Go to  15).

    No 

    1. Go to  16).
  15. 15) LIST OF POSSIBLE CAUSES 

    If any other DTCs set during the road test, refer to the DIAGNOSTIC CODE INDEX  table and perform the appropriate symptom.

    If no other DTCs set during the road test, below is a list of possible causes, but not strictly limited to those:

    Check for excessive debris in the Transmission Oil pan, plugged, cracked, or split Primary Transmission Oil Filter and/or seal.

    Check for cuts or missing No. 5 check ball in the main valve body.

    Check the 4C and UD accumulator pistons and seals, UD bleed orifice, and the Solenoid Switch Valve and Plugs in the main valve body.

    Check the UD clutch piston seals, reaction shaft support seal rings, and the flatness of the pump valve body and pump housing faces.

    Check the 4C clutch piston seals, and bleed orifice.

    Check the UD clutch piston seals, reaction shaft support seal rings, and dribbler assemblies, and the flatness of the pump valve body and pump housing faces.

    View repair 

    Repair 

    1. Repair as necessary. Refer to the Service Information for proper repair procedures.
      NOTE: If the UD or 4C 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.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .
  16. 16) INTERMITTENT DTC 

    The conditions necessary to set this DTC are not present at this time.

    Use the Event Data to help identify the conditions and/or possible causes that may have caused the DTC to set.

    Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.

    Where there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .

    No 

    1. Test Complete.
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