Transfer Case Shift Control Module Scan Tool Information. Chevrolet Tahoe

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2008 🢒 Tahoe - 4WD 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 Transfer Case Shift Control Module Scan Tool Information

Transfer Case Shift Control Module Scan Tool Information MP 3023/3024-NQH

Table 1:	Scan Tool Data Parameters
Table 2:	Scan Tool Output Controls

Scan Tool Data Parameters

Parameter	Expected Value	Description
Operating Conditions: Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories OFF, unless otherwise noted.
2WD High Indicator Light	On	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 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.
Accessory Status	Active	This parameter displays Not Active, and Active.
ATC Motor Init. Test	Passed	This parameter displays Not Initialized, Passed, Failed, or in Progress when the key off initialization sequence has occurred.
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.
Clutch Calibration Status	Normal Learn	This parameter displays not learned, initial learn, and normal learn.
Clutch Coupling	Varies	This parameter displays the amount of clutch activation shown in percentage.
Front Axle Actuator	Battery Voltage	This parameter displays the voltage input to the front axle actuator from 0-25 volts.
Front Axle Actuator Status	Disengaged	This parameter displays either disengaged or engaged, engaged when the system is in Auto 4WD, 4WD, or 4WD Low modes, and disengaged when the mode is in neutral, or 2WD mode.
Front Axle Switch	Unlocked	This parameter displays either locked or unlocked depending on the feedback from the front axle actuator switch, which will be battery voltage when the vehicle is in a 4WD or Auto 4WD mode.
Incremental Impulse Sensor	Varies	This parameter displays the direction the incremental sensor is moving as clockwise or counter clockwise.
Incremental Position Sensor Direction	Varies	This parameter displays the pulse width modulated voltage signal being supplied to the incremental sensor via the transfer case control module.
Incremental Position Sensor	Varies	This parameter displays the position of the incremental sensor in degrees.
Incremental Position Sensor	Varies	This parameter displays the position of the incremental sensor in incremental sensor return voltage.
Mode Switch Return Voltage	Varies	This parameter displays the transfer case shift control switch return voltage from 0-7.5 volts.
Mode Switch Selected	2 High	This parameter displays the transfer case shift control switch mode currently selected by the driver.
Mode Switch Supply Voltage	5 Volts	This parameter displays the voltage being supplied to the transfer case shift control switch by the transfer case control module from 0-7.5 volts.
Motor Brake	Battery Voltage	This parameter displays the voltage being supplied to the transfer case motor brake via the transfer case control module from 0 to battery voltage.
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.
Rotational Position Sensor	Varies	This parameter displays the position of the rotational position sensor in degrees.
Rotational Position Sensor	Varies	This parameter displays the position of the rotational position sensor by displaying the rotational position sensor return voltage as read by the transfer case control module.
Run/Crank	Active	This parameter displays the status of the run/crank signal to the transfer case control module as active or inactive.
Software Part Number	Current Software Release	This parameter displays the numbers or characters assigned to the current version of software used in the transfer case shift control module. The scan tool displays an alphanumeric value.
Total Slippage	Varies	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	Disengaged	This parameter displays the status of the transfer case lock as engaged or disengaged, the lock will be engaged in auto 4WD, 4WD, or 4WD low and disengaged in 2WD and neutral.
Transfer Case Motor	0 Amps	This parameter displays the current draw in amperage that the motor is currently drawing from the transfer case control module.
Transfer Case Position	2 High	This parameter displays the current mode the transfer case is in as indicated by the transfer case control module.
Trans. Fluid Temp	Varies	This parameter displays the transmission fluid temperature in degrees Celsius.
TR Switch Status	Park	This parameter displays the current gear the transmission is in.
Vehicle Speed	Varies	This parameter displays vehicle speed in kilometers per hour.

Scan Tool Output Controls

Output Control	Description
Important: Transmission must be in transmission neutral for any of these output controls to operate. 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 Learn	This function allows the technician to command the transfer case shift control module to relearn the clutch status after the encoder motor, module, or transfer case is replaced.
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.
Neutral Indicator Light	This function allows the technician to command the neutral indicator light, within the transfer case shift control switch, on or off.