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  • P0733 Gear Ratio Error In 3rd

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    P0733 GEAR RATIO ERROR IN 3RD

    When Monitored and Set Condition:

    When Monitored: The transmission gear ratio is monitored continuously while the transmission is in gear.
    Set Condition: If the ratio of the Input RPM to the Output RPM does not match the current gear ratio. This DTC can take up to five minutes of problem identification before illuminating the MIL.

    POSSIBLE CAUSES

    • RELATED DTC'S PRESENT
    • RELATED PRESSURE SWITCH DTC'S PRESENT
    • INTERNAL TRANSMISSION
    • TRANSMISSION SOLENOID/TRS ASSEMBLY
    • INTERMITTENT GEAR RATIO ERRORS

    DIAGNOSTIC PROCEDURE

    NOTE: Low fluid level can be the cause of many transmission problems. If the fluid level is low locate and repair the leak then check and adjust the fluid level. Refer to appropriate AUTOMATIC TRANSMISSION article.

    NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms.

    NOTE: Diagnose 1 Trip Failures as a fully matured DTC.

    NOTE: Verify flash level of Powertrain Controller. Some problems are corrected by software upgrades to the Transmission and Engine Systems.

    NOTE: Due to the integration of the Powertrain and Transmission control modules - if a controller flash is performed it is necessary to perform STANDARD PROCEDURE - TCM QUICK LEARN and the STANDARD PROCEDURE - DRIVE LEARN . Failure to do so may result in shift quality complaints.

    NOTE: Check for applicable TSB's that may apply.

    1. With the DRBIII(R), read the engine DTC's. Check and repair all Engine DTC's prior to performing Transmission symptom diagnostics. With the DRBIII(R), read Transmission DTC's. Record all DTC's and 1 Trip Failures. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Repair as necessary. Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test for SYMPTOM: P0706-CHECK SHIFTER SIGNAL . For Gear Ratio DTC's, check and record all CVI's. Most DTC's set on start up but some must be set by driving the vehicle to ensure that all diagnostic monitors have run. Perform this procedure prior to Symptom diagnosis. Continue Go To 2
    2. With the DRBIII(R), check for other transmission DTCs If any of these DTCs are present, perform their respective tests first. Are the DTCs P0944, P0715, P0720, P1794, P0867, P0932, P0868, or P0869 present also?
      Yes --> Refer to the Transmission Category and perform the appropriate symptom. If any of these DTCs are present, they will cause a Speed Ratio Error. Perform the test for P0944 first if it is present. Perform (NGC) 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
      No --> Go To 3
    3. With the DRBIII(R), check for other transmission DTCs Are the DTCs P0870 OD Hydraulic Pressure Switch and/or P0871 OD Pressure Switch present also?
      Yes --> Replace the Transmission Solenoid/TRS Assembly. Refer to appropriate AUTOMATIC TRANSMISSION article. Perform (NGC) 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
      No --> Go To 4
    4. With the DRBIII(R), perform the 3rd Gear Clutch Test. Follow the instructions on the DRBIII(R). Increase the throttle angle, 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 5
      No --> Go To 6
    5. The conditions to set this DTC are not currently present. Check the gearshift linkage adjustment. Intermittent gear ratio DTCs can be set by problems in the Input and Output Speed Sensor circuits and/or Speed Sensor Ground circuit. Remove the Starter Relay.
      NOTE: Failure to remove the Starter Relay can cause a Transmission - No Response condition. Install Transmission Simulator, Miller tool #8333.
      Wiggle wiring and connectors while checking for intermittent operation with the Transmission Simulator. Gear ratio DTCs can also be set under extreme temperature conditions, this is usually caused by an internal problem. Verify if the problem is only experienced under extreme hot or cold conditions. With the DRBIII(R), check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Were there any problems found.
      Yes --> Repair as necessary. Perform (NGC) 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
      No --> Test Complete.
    6. Repair the transmission as necessary. If there were any line pressure DTC's also present, make sure to inspect the Transmission Oil Pump and Pressure Control Solenoid. Refer to appropriate AUTOMATIC TRANSMISSION article.
      NOTE: If DTC's P0871 and/or P0870 are also present, replace the Transmission Solenoid/TRS Assembly in addition to necessary internal repairs.
      If there are no possible causes remaining, view repair.

    Repair

    Repair internal transmission. Refer to appropriate AUTOMATIC TRANSMISSION article. Perform (NGC) 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 :


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