Scan Tool Data List

The scan tool used provides the following capabilities:
^ Read the data list.
^ Read current and history trouble codes.
^ Clear the diagnostic trouble codes after a repair is completed.

Make sure the scan tool contains the latest diagnostic information before attempting to communicate with the transfer case shift control module. To use the scan tool, connect it to the Data Link Connector (DLC) and turn the ignition switch to the RUN position. The scan tool reads the Class II serial data sent from the transfer case shift control module connector C1 terminal E9 to the DLC terminal 2.
The Transfer Case Scan Tool Data List contains all restraint related parameters that are available on the scan tool. The list is arranged in the order as they appear on the scan tool.
Use the Transfer Case Scan Tool Data List only after the following is determined:
^ Diagnostic System Check is completed.
^ No Diagnostic Trouble Codes (DTCs) are set.
^ Transfer Case Diagnostics indicates the system is functioning properly.

Scan tool values from a properly operating system may be used for comparison with the automatic transfer case system you are diagnosing. The Transfer Case Scan Tool Data List represents values recorded under the following conditions:
^ Engine is at idle
^ Upper radiator hose is hot
^ Closed throttle
^ Gear is in PARK or NEUTRAL
^ Closed Loop
^ Accessories are OFF

IMPORTANT: Make sure the scan tool that you are using is functioning properly. Use of a malfunctioning scan tool can result in misdiagnosis and unnecessary parts replacement. Only the parameters listed in "Scan Tool Data Definitions" are referenced in this section for use in diagnosis. If all values are within the typical range described, refer to Intermittents and Poor Connections (Transfer Case-NV 136 (Automatic), for diagnosis. Testing and Inspection