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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 >> P0124-TPS/Apps Intermittent >> Diagnostic Test

Diagnostic Test

  1. 1) DETERMINING IF RELATED ENGINE TPS DTCS ARE PRESENT 

    With the scan tool, read Engine DTCs.

    Are there any Engine TPS/APPS DTCs present? 

    Yes 

    1. Refer to the appropriate Engine ELECTRICAL DIAGNOSTICS article and perform the appropriate Symptom.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .

    No 

    1. Go to  2).
  2. 2) CHECK IF THE DTC IS CURRENT 

    With the scan tool, record the Event Data to help identify the conditions in which the DTC was set.

    With the scan tool, erase PCM DTCs and the Event Data.

    NOTE: Clearing DTCs does NOT erase the Event Data. To erase the Event Data you must either perform a Quick Learn procedure or battery disconnect (if available) with the scan tool, or manually disconnect the battery. Whatever method used might reset certain learned transmission values to controller defaults and may cause poor shift quality until those values are relearned.

    Using the Event Data recorded earlier, test drive the vehicle while trying to duplicate the operating conditions in which the DTC originally set.

    With the scan tool, read DTCs.

    Did this DTC reset during the road test? 

    Yes 

    1. Go to  3).

    No 

    1. Go to  4).
  3. 3) CHECK THROTTLE POSITION SENSOR OPERATION 

    Ignition On, Engine Not Running.

    With the scan tool, under Transmission Sensors, monitor the TPS voltage in the following step.

    Slowly open and close the throttle while checking for erratic voltage changes.

    If equipped with ETC, use the ETC Throttle Follower test in the scan tool to check for erratic voltage changes.

    Was the TPS voltage change smooth and consistent? 

    Yes 

    1. Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform Quick Learn.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .

    No 

    1. Replace the Throttle Position Sensor per the Service Information.
    2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST .
  4. 4) CHECK THE WIRING AND CONNECTORS 

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

    Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.

    Wiggle the wiring and connectors while checking for shorted and open circuits.

    With the scan tool, check the Event Data to help identify the conditions in which the DTC was set.

    Were there any problems found? 

    Yes 

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

    No 

    1. Test Complete.
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