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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 >> U1146-Lost Communication With External Memory >> Diagnostic Test

Diagnostic Test

  1. 1) CHECK IF THE DTC IS ACTIVE 

    With the scan tool, read Transmission DTCs.

    Is the status Active for this DTC? 

    Yes 

    1. Go To  2).

    No 

    1. Go To  12).
  2. 2) CHECK THE (T327) DATA IN/OUT SELECT CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 1: Measuring Voltage Of (T327) Data In/Out Select Circuit
    GC0056454Courtesy of CHRYSLER LLC

    Turn the ignition off to the lock position.

    Disconnect the TCM C1 harness connector.

    Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.

    Ignition on, engine not running.

    Measure the voltage of the (T327) Data IN/OUT Select circuit.

    Is the voltage above .02 volts? 

    Yes 

    1. Repair the (T327) Data IN/OUT Select circuit for a short to voltage.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  3).
  3. 3) CHECK THE (T313) CHIP SELECT CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 2: Measuring Voltage Of (T313) Chip Select Circuit
    GC0056455Courtesy of CHRYSLER LLC

    Measure the voltage of the (T313) Chip Select circuit.

    Is the voltage above 0.1 volts? 

    Yes 

    1. Repair the (T313) Chip Select circuit for a short to voltage.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  4).
  4. 4) CHECK THE (T302) CLOCK SELECT CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 3: Measuring Voltage Of (T302) Clock Select Circuit
    GC0056456Courtesy of CHRYSLER LLC

    Measure the voltage of the (T302) Clock Select circuit.

    Is the voltage above 0.2 volts? 

    Yes 

    1. Repair the (T302) Clock Select circuit for a short to voltage.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  5).
  5. 5) CHECK THE (T327) DATA IN/OUT SELECT CIRCUIT FOR AN OPEN 
    Fig 4: Checking Data In/Out Select Circuit For Open
    GC0056457Courtesy of CHRYSLER LLC

    Turn the ignition off to the lock position.

    Measure the resistance of the (T327) Data In/Out Select circuit between the TCM C1 harness connector and the Transmission Solenoid/Pressure Switch Assembly harness connector.

    Is the resistance above 5.0 ohms? 

    Yes 

    1. Repair the (T327) Data IN/OUT Select circuit for an open.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  6).
  6. 6) CHECK THE (T313) CHIP SELECT CIRCUIT FOR AN OPEN 
    Fig 5: Checking Chip Select Circuit For Open
    GC0056458Courtesy of CHRYSLER LLC

    Measure the resistance of the (T313) Chip Select circuit between the TCM C1 harness connector and the Transmission Solenoid/Pressure Switch Assembly harness connector.

    Is the resistance above 5.0 ohms? 

    Yes 

    1. Repair the (T313) Chip Select circuit for an open.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  7).
  7. 7) CHECK THE (T302) CLOCK SELECT CIRCUIT FOR AN OPEN 
    Fig 6: Checking Clock Select Circuit For Open
    GC0056459Courtesy of CHRYSLER LLC

    Measure the resistance of the (T302) Clock Select circuit between the TCM C1 harness connector and the Transmission Solenoid/Pressure Switch Assembly harness connector.

    Is the resistance above 5.0 ohms? 

    Yes 

    1. Repair the (T302) Clock Select circuit for an open.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  8).
  8. 8) CHECK THE (T327) DATA IN/OUT SELECT CIRCUIT FOR A SHORT TO GROUND 
    Fig 7: Measuring Resistance Between Ground And (T327) Data In/Out Select Circuit
    GC0056460Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (T327) Data IN/OUT Select circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the (T327) Data IN/OUT Select circuit for a short to ground.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  9).
  9. 9) CHECK THE (T313) CHIP SELECT CIRCUIT FOR A SHORT TO GROUND 
    Fig 8: Measuring Resistance Between Ground And (T313) Chip Select Circuit
    GC0056461Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (T313) Chip Select circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the (T313) Chip Select circuit for a short to ground.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  10).
  10. 10) CHECK THE (T302) CLOCK SELECT CIRCUIT FOR A SHORT TO GROUND 
    Fig 9: Measuring Resistance Between Ground And (T302) Clock Select Circuit
    GC0056462Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (T302) Clock Select circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the (T302) Clock Select circuit for a short to ground.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Go To  11).
  11. 11) CHECK THE TCM 

    Replace or repair the CV Transmission (valve body) per the Service Information. Perform CVT VERIFICATION TEST .

    Did the DTC reset during the verification test? 

    Yes 

    1. Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.
    2. Perform CVT VERIFICATION TEST .

    No 

    1. Test Complete.
  12. 12) 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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