Important: Ensure that the scan tool you are using is functioning properly and has the latest software. Use of a malfunctioning scan tool or one that has old software can result in misdiagnosis and unnecessary parts replacement. The transfer case Scan Tool Data List contains all the automatic transfer case (ATC) related parameters that are available on the scan tool. The Scan Tool Data List is arranged in alphanumeric order.

Use the transfer case Scan Tool Data List only after the following is determined:

Scan tool values from a properly operating system may be used for comparison with the transfer case system you are diagnosing. The transfer case Scan Tool Data List represents values recorded under the following conditions:

Only the parameters listed below are referenced in this service manual for use in diagnosis. If all values are within the typical range described below, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems for further diagnosis.