| Table 1: | Scan Tool Data Parameters |
| Table 2: | Scan Tool Output Controls |
Parameter | Expected Value | Description |
|---|---|---|
Operating Conditions: Engine is at idle, upper radiator hose is hot, closed throttle, gear is in PARK or NEUTRAL and accessories are OFF. | ||
2WD High Indicator Light | Off | This parameter displays On when the transfer case shift control module commands the 2WD high indicator light On. The scan tool displays On or Off. |
4WD High Indicator Light | Off | This parameter displays On when the transfer case shift control module commands the 4WD high indicator light On. The scan tool displays On or Off. |
4WD Low Active | No | This parameter displays Yes when the transfer case is currently in the 4WD low lock mode. The scan tool displays Yes or No. |
4WD Low Indicator Light | Off | This parameter displays On when the transfer case shift control module commands the 4WD low indicator light On. The scan tool displays On or Off. |
ATC Application | Varies | This parameter displays the model number assigned to the transfer case. The scan tool displays a numeric value. |
ATC Slip Speed | 0 | This parameter displays the RPM difference between the front and rear propshafts. The scan tool displays a range of 0-8,192 RPM. |
Auto 4WD Indicator Light | On | This parameter displays On when the transfer case shift control module commands the auto 4WD indicator light On. The scan tool displays On or Off. |
Battery Voltage | Battery Voltage | This parameter displays the voltage measured by the transfer case shift control module at the transfer case shift control module battery feed. The scan tool displays a range of 0-25.5 volts. |
Current Slip Adapts | Varies | This parameter displays corrective adjustments made by the transfer case shift control module for wheel slip events. The scan tool displays a numeric value. |
Encoder Gear Position | Varies | This parameter displays the mode the transfer case is currently in. |
Encoder Return Voltage | 0-5 V | This parameter displays the voltage measured by the transfer case shift control module at the encoder signal return. The scan tool displays a range of 0-7.5 volts. |
Encoder Supply Voltage | 0-5 V | This parameter displays the voltage measured by the transfer case shift control module at the 5V reference circuit. The scan tool displays a range of 0-7.5 volts. |
Front Axle Requested | Yes | This parameter displays Yes if the transfer case shift control module requests the front axle switch On. The scan tool displays Yes or No. |
Front Axle Switch | Locked | This parameter displays the feedback states of the front propshaft. The scan tool displays Locked or Unlocked. |
Front Propshaft Speed | 0 | This parameter displays the rotational speed of the front propshaft. The scan tool displays a range of 0-8,192 RPM. |
Ign. Cycles Since Last Current DTC | Varies | This parameter displays how many ignition cycles have occurred since last current DTC was set. The scan tool displays a numeric value. |
Mode Switch Return Voltage | 0-5 V | This parameter displays the return voltage from the transfer case shift control switch. The scan tool displays a range of 0-5 volts. |
Mode Switch Selected | Varies | This parameter displays the transfer case shift control switch button currently depressed by the driver. |
Neutral Indicator Light | Off | This parameter displays On when the transfer case shift control module commands the neutral indicator light On. The scan tool displays On or Off. |
Rear Propshaft Speed | 0 | This parameter displays the rotational speed of the rear propshaft. The scan tool displays a range of 0-8,192 RPM. |
Service 4WD Lamp | Off | This parameter displays On if the transfer case shift control module commands the Service 4WD lamp, or message, On. The scan tool displays On or Off. |
Slip Adapt PWM | 0 | This parameter displays the duty cycle applied to the transfer case encoder motor. The scan tool displays a range of 0-100 percent. |
Total Slippage | 0 | This parameter displays the total slippage of both the front and rear propshafts. The scan tool displays a range of 0-8,192 RPM. |
Transfer Case Lock | Disabled | This parameter displays Enabled if the transfer case shift control module commands the transfer case motor brake On. The scan tool displays Enabled or Disabled. |
Output Control | Description |
|---|---|
Refer to the scan tool manual for complete scan tool operating instructions. | |
2WD High Indicator Light | This function allows the technician to command the 2WD high indicator light, within the transfer case shift control switch, on or off. |
4WD High Indicator Light | This function allows the technician to command the 4WD high indicator light, within the transfer case shift control switch, on or off. |
4WD Low Indicator Light | This function allows the technician to command the 4WD low indicator light, within the transfer case shift control switch, on or off. |
ATC Motor A Control | This function allows the technician to energize the motor, causing it to shift the transfer case through all five modes. Motor control A moves in the opposite direction as motor control B. |
ATC Motor B Control | This function allows the technician to energize the motor, causing it to shift the transfer case through all five modes. Motor control B moves in the opposite direction as motor control A. |
Auto 4WD Indicator Light | This function allows the technician to command the auto 4WD indicator light, within the transfer case shift control switch, on or off. |
Engage Front Axle | This function allows the technician to engage and disengage the front axle actuator. When the front axle actuator is engaged, the front axle becomes a live axle, causing the front propshaft to turn. |
Neutral Indicator Light | This function allows the technician to command the neutral indicator light, within the transfer case shift control switch, on or off. |
Transfer Case Lock | This function allows the technician to turn the transfer case lock on and off. With the transfer case lock on, the transfer case cannot be shifted. |
