The scan tool provides the following capabilities:
| • | Displays the data list. |
| • | Displays current and history diagnostic trouble codes (DTC). |
| • | Clear the DTC 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:
| • | The Diagnostic System Check - Vehicle in Vehicle DTC Information has been completed. |
| • | There are no diagnostic trouble codes (DTCs) set. |
| • | Transfer case diagnostic tables indicate 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:
| • | Engine is at idle |
| • | Closed throttle |
| • | Gear is in Park or Neutral |
| • | 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, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems for further diagnosis.
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. | |||
2WD High Indicator Light | Data Display | On/Off | Off |
4WD High Indicator Light | Data Display | On/Off | Off |
4WD Low Indicator Light | Data Display | On/Off | Off |
ATC Slip Speed | Data Display | RPM | 0 |
Auto 4WD Indicator Light | Data Display | On/Off | On |
Commanded Mode Indicator | Data Display | 2WD/4WD High/4WD Low/Auto 4WD | Varies |
Encoder Circuit A | Data Display | On/Off | Off |
Encoder Circuit B | Data Display | On/Off | On |
Encoder Circuit C | Data Display | On/Off | Off |
Encoder Circuit P | Data Display | On/Off | On |
Encoder Gear Position | Data Display | 2WD/4WD High/4WD Low/Auto 4WD | Varies |
Front Axle Requested | Data Display | Yes/No | Yes |
Front Axle Switch | Data Display | Locked/Unlocked | Locked |
Front Propshaft Speed | Data Display | RPM | 0 |
Ignition 3 | Data Display | Volts | Battery Voltage |
Last Adapt Highest PWM | Data Display | % DC | 0 |
Mode Switch Selected | Data Display | On/Off | Off |
Neutral Indicator Light | Data Display | On/Off | Off |
Park Switch | Data Display | Closed/Open | Closed |
Rear Propshaft Speed | Data Display | RPM | 0 |
Rear Slippage | Data Display | RPM | 0 |
Service 4WD Lamp | Data Display | On/Off | Off |
Service 4WD Lamp Open | Data Display | Yes/No | No |
Service 4WD Lamp Shorted | Data Display | Yes/No | No |
Slip Adapt Mode | Data Display | Enabled/Disabled | Disabled |
Slip Adapt PWM | Data Display | % DC | 0 |
Throttle Anticipation Mode | Data Display | Enabled/Disabled | Disabled |
Total Slippage | Data Display | RPM | 0 |
TP Angle | Data Display | % | 0 |
Transfer Case Lock | Data Display | Enabled/Disabled | Enabled |
