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Home >> Fiat >> 2020 >> 124 Spider Classica, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 ((Aw6R31 Automatic Transmission Control Module (TCM) - Electrical Diagnostics)) >> Diagnosis And Testing >> U0140-00 Lost Communication With Body Control Module >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR THE PRESENCE OF ERRORS 
    1. Go to Key-OFF condition, then ON (engine off or on).
    2. Connect the diagnosis equipment and check for related errors.

      Are there any other errors?

      Yes 

      • Proceed as indicated by the diagnosis equipment to resolve other errors.
      • Go to Step. Refer to  2.

      No 

      • Go to Step. Refer to  2.
  2. CHECK TRANSMISSION CONTROL MODULE WIRING 
    1. Go to Key-OFF status.
    2. Disconnect the Transmission Control Module and Body Module connectors.
    3. Check whether the terminals of the Transmission Control Module and Body Module are disconnected, damaged or corroded.

      Are terminals disconnected, damaged or corroded?

      Yes 

      • Repair or replace the connector or the terminals.
      • Go to Step. Refer to  7.

      No 

      • Go to Step. Refer to  3.
  3. CHECK POWER SUPPLY OF BODY CONTROL MODULE 
    1. Check correct power supply of Body Module

      Is the power supply correct?

      Yes 

      • Go to Step. Refer to  4.

      No 

      • Restore correct power supply.
      • Go to Step. Refer to  7.
  4. CHECK POWER SUPPLY OF TRANSMISSION CONTROL MODULE 
    1. Check correct power supply of Transmission Control Module.

      Is the power supply correct?

      Yes 

      • Go to Step. Refer to  5.

      No 

      • Restore correct power supply.
      • Go to Step. Refer to  7.
  5. CHECK WIRING OF CAN NETWORK BETWEEN BODY CONTROL MODULE AND TRANSMISSION CONTROL MODULE 
    1. Check for the presence of an open circuit on the wiring on CAN network between Body Module and Transmission Control Module.

      Is there an open circuit on the CAN network?

      Yes 

      • Remove the open circuit.
      • Go to Step. Refer to  7.

      No 

      • Go to Step. Refer to  6.
  6. CHECK CORRECT OPERATION OF THE BODY CONTROL MODULE 
    1. Check correct operation of Body Module.

      Is the Body Module working correctly?

      Yes 

      • Go to Step. Refer to  7.

      No 

  7. CHECK CORRECT OPERATION OF TRANSMISSION CONTROL MODULE 
    1. Perform the Transmission Control Module error deletion procedure.
    2. Start the engine.
    3. Heat engine and gearbox.
    4. Drive the vehicle with automatic transmission selector in D position and ensure that the gear is shifted from the first to the sixth.
    5. Check whether there is a fault.

      Is the error still present?

      Yes 

      No 

      • End of diagnosis.