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Home >> Jeep >> 2007 >> Compass Limited, AWD, Automatic CVT >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> (Continuously Variable Transmission (CVT) - Electrical Diagnostics) >> CVT - Electrical Diagnostics >> DTC Troubleshooting >> P1729-Transmission Ratio Control Circuit >> Diagnostic Test

Diagnostic Test

  1. 1) CHECK TO SEE IF THE DTC IS ACTIVE 

    With the scan tool, read Transmission DTCs.

    Is the status Active for this DTC or is the STARTS SINCE SET counter 2 or less? 

    Yes 

    1. Go To  2).

    No 

    1. Go To  6).
  2. 2) CHECK THE (T314) A, (T315) B, (T316) C, AND (T317) D STEP MOTOR CONTROL CIRCUIT(S) FOR A SHORT TO VOLTAGE 
    Fig 1: Checking Step Motor Control Circuit(s) For Short To Voltage
    GC0056488Courtesy of CHRYSLER LLC

    Turn the ignition off to the lock position.

    Disconnect the TCM C1 and C2 harness connectors.

    Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.

    Ignition on, engine not running.

    Measure separately the voltage of the (T314) A, (T315) B, (T316) C, and (T317) D Step Motor Control circuits.

    Is the voltage above .05 volts for any of the Step Motor Control circuits? 

    Yes 

    1. Repair the (T314) A, (T315) B, (T316) C, and/or (T317) D Step Motor Control circuit(s) for a short to voltage.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  3).
  3. 3) CHECK THE (T314) A, (T315) B, (T316) C, AND (T317) D STEP MOTOR CONTROL CIRCUIT(S) FOR AN OPEN 
    Fig 2: Checking Step Motor Control Circuit(s) For Open
    GC0056489Courtesy of CHRYSLER LLC

    Turn the ignition off to the lock position.

    Measure separately the resistance of the (T314) A, (T315) B, (T316) C, and (T317) D Step Motor Control circuits between the TCM C1 harness connector and the Transmission Solenoid/Pressure Switch harness connector.

    Is the resistance above 5.0 ohms for any of the Step Motor Control circuits? 

    Yes 

    1. Repair the (T314) A, (T315) B, (T316) C, and/or (T317) D Step Motor Control circuit(s) for an open.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  4).
  4. 4) CHECK THE (T314) A, (T315) B, (T316) C, AND (T317) D STEP MOTOR CONTROL CIRCUIT(S) FOR A SHORT TO GROUND 
    Fig 3: Checking Step Motor Control Circuit(s) For Short To Ground
    GC0056490Courtesy of CHRYSLER LLC

    Measure separately the resistance between ground and the (T314) A, (T315) B, (T316) C, and (T317) D Step Motor Control circuits.

    Is the resistance below 5.0 ohms for any of the Step Motor Control circuits? 

    Yes 

    1. Repair the (T314) A, (T315) B, (T316) C, and/or (T317) D Step Motor Control circuit(s) for a short to ground.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  5).
  5. 5) TRANSMISSION CONTROL MODULE 

    Replace the Transmission Control Module per the Service Information. Perform CVT VERIFICATION TEST .

    During the verification test did the DTC reset? 

    Yes 

    1. Replace or repair the CV Transmission (Step Motor) per the Service Information.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Test Complete.
  6. 6) INTERMITTENT WIRING AND CONNECTORS 

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

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

    Wiggle the wires while checking for shorted and open circuits.

    Were there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Test Complete.
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