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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 334 ((Powertrain Control Module (Pcm) - Electrical Diagnostics - 65RFE Automatic Transmission - 1500)) >> Diagnosis And Testing >> P0731-Gear Ratio Error In 1ST >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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 any Transmission solenoid, line pressure, speed sensor and/or loss of prime DTCs present?

      Yes 

      • Perform the appropriate diagnostic procedure. If any of these DTCs are present, they may cause a Gear Ratio Error. Perform the test for P0944 first if it is present.

      No 

      • Go To  2
  2. CHECK IF DTC P0731 IS CURRENT 
    1. With the scan tool, perform the 1st Gear Clutch Test. Follow the instructions on the scan tool.
    2. Increase the throttle angle or TPS Degree to 30° for no more than a few seconds.
      CAUTION:

      Do not overheat the transmission.

      Did the Clutch Test pass, Input Speed remain at zero?

      Yes 

      • Go To  3

      No 

      • Go To  4
  3. CHECK FOR INTERMITTENT OPERATION 
    1. The conditions to set this DTC are not currently present.
    2. With the scan tool, check the Event Data to help identify the conditions in which the DTC set.
      • If the Event Data shows DTC P0731 was set in Park, Reverse or Neutral, replace the Powertrain Control Module.
      • If the Event Data shows DTC P0731 set with input RPM = zero, check the input speed sensor and related wiring.
      • If the Event Data shows DTC P0731 set with line pressure significantly below desired line pressure, check for the cause of low line pressure (i.e. oil level, mis-installed or damaged primary filter or filter seal, sticking main regulator valve in pump, etc.).
      • If the Event Data shows DTC P0731 is set with the UD pressure switch open (but line pressure matches Desired Line Pressure), air check the UD hydraulic clutch circuit for leakage in accordance with the Service Information. If the UD hydraulic clutch circuit is OK, replace the solenoid/TRS assembly.
    3. Check the gearshift linkage adjustment.
    4. Intermittent Gear Ratio DTCs can set by problems in the Input and Output Speed Sensor circuits and/or Speed Sensor Ground circuit.
    5. Remove the Starter Relay from the PDC.
      CAUTION:

      Removal of the Starter Relay will prevent the vehicle from being started in gear.

      WARNING:

      The Starter Relay must be removed. Failure to do so can result in possible serious or fatal injury.

    6. Install the Transmission Simulator (special tool #8333B, Simulator, Transmission).
    7. Wiggle wiring and connectors while checking for intermittent operation with the Transmission Simulator.
    8. Gear ratio DTCs can also be set under extreme temperature conditions.
    9. Verify if the problem is only experienced under extreme hot or cold conditions.

      Were any problems found.

      Yes 

      • Repair as necessary.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

      No 

      • Test Complete.
  4. CHECK INTERNAL TRANSMISSION 
    1. Repair internal transmission as necessary. Refer to the Service Information.
    2. If there were any line pressure DTCs present along with this DTC, make sure to inspect the: Primary oil filter and seal, Transmission Oil Pump and the Main regulator valve in accordance with the Service Information.
    3. If DTCs P0876 and/or P0875 were present in addition to DTC P0731, replace the Transmission Solenoid/TRS Assembly in addition to necessary internal repairs.
    4. Pay particular attention to the following list of possible causes when repairing the transmission:
      • Cut UD piston seal
      • Failed overrunning clutch
      • Cut UD accumulator seal ring
      • Burned UD clutch
      • Broken UD accumulator piston
      • Low line pressure
      • Broken/missing main valve body bleed orifice
      • Broken/missing dribbler orifice assembly in reaction shaft support
      • Poor machining on pump valve body face
      • Transmission Solenoid/TRS Assembly

      Repair 

      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, low line pressure in Event Data, etc.) replace the Transmission Solenoid/TRS Assembly in addition to any necessary internal repairs.

      • Repair internal transmission in accordance with the Service Information.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .
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