The scan tool used provides the following capabilities:
| • | Displays the data list. |
| • | Displays current and history trouble codes. |
| • | Clear the diagnostic trouble codes after a repair is completed. |
Important: Make sure the scan tool that 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.
To use the scan tool, connect it to the data link connector (DLC) and turn the ignition switch to the RUN position.
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:
| • | A Diagnostic System Check has been 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 transfer case system you are diagnosing. The Transfer Case Scan Tool Data List represents values recorded under the following conditions:
| • | The engine is at idle. |
| • | Closed throttle |
| • | The gear is in PARK or NEUTRAL. |
| • | The accessories are OFF. |
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, diagnose the problem using Intermittents and Poor Connections.
Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
Engine is at Idle, Upper Radiator Hose Hot, Closed Throttle, Gear is in Park or Neutral, and Accessories are OFF. | |||
ATC Slip Speed | ATC Data Display | RPM | 0 |
AWD Enabled | ATC Data Display | Yes/No | No |
Front Propshaft Signal Fault | ATC Data Display | Yes/No | No |
Front Propshaft Speed | ATC Data Display | RPM | 0 |
GM Part Number | ATC Data Display | Part Number | Part Number |
Ignition 3 | ATC Data Display | Volts | Battery Voltage |
Last Adapt Highest PWM | ATC Data Display | %DC | Varies |
Motor Ground Circuit Open | ATC Data Display | Yes/No | No |
Motor A or B Circuit Fault | ATC Data Display | Yes/No | No |
Motor A or B Circuit Open | ATC Data Display | Yes/No | No |
Motor A or B Short to Gnd. | ATC Data Display | Yes/No | No |
Motor A or B Short to Volts | ATC Data Display | Yes/No | No |
Rear Propshaft Signal Fault | ATC Data Display | Yes/No | No |
Rear Propshaft Speed | ATC Data Display | RPM | 0 |
Slip Adapt PWM | ATC Data Display | %DC | 0 |
Software ID | ATC Data Display | Number | Varies |
Total Slippage | ATC Data Display | RPM | 0 |
TP Angle | ATC Data Display | % | 0 |
