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Diagnostic System Check - Transfer Case: Notes

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These diagnostic procedures help you find and repair automatic transfer case (ATC) system malfunctions. This service category also contains information for repairing ATC system malfunctions. For best results, use the diagnostic tables and follow the sequence listed below:

  1. Perform the Transfer Case Diagnostic System Check. All ATC diagnostics must begin with the Transfer Case Diagnostic System Check.

    The Transfer Case Diagnostic System Check determines the following:

    • Proper SERVICE 4WD indicator operation.
    • Ability of the transfer case shift control module to communicate through the Data Link Connector (DLC)
    • Existence of ATC DTCs

  2. Refer to the diagnostic table as directed by the Transfer Case Diagnostic System Check. The diagnostic tables help enable you to diagnose any ATC system malfunction. Bypassing these procedures may result in the following:
    • Extended diagnostic time
    • Incorrect diagnosis
    • Incorrect parts replacement
  3. Repeat the Transfer Case Diagnostic System Check after you perform any repair or diagnostic procedure. This verifies that you correctly performed the repair. This also ensures that other malfunctions do not exist.
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