Transfer Case Control Module Scan Tool Information

Scan Tool Data Parameters

Parameter	Expected Value	Expected Value	Description
Operating Conditions: Ignition ON, engine OFF, Park or Neutral, and transfer case in 2WD, unless otherwise noted.
2WD High Range Indicator Command	ON or OFF	ON	This parameter displays ON when the transfer case control module commands the 2WD High indicator light ON.
2WD High Range Indicator Control Circuit High Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 2WD High range indicator control circuit. The 2WD High range indicator control circuit is made up of the indicator dimming control circuit and the 2WD High indicator control circuit. A short to battery on the 2WD High indicator control circuit will cause this parameter to display Malfunction.
2WD High Range Indicator Control Circuit Low Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 2WD High range indicator control circuit. The 2WD High range indicator control circuit is made up of the indicator dimming control circuit and the 2WD High indicator control circuit. A short to ground on the 2WD High indicator control circuit will cause this parameter to display Malfunction.
2WD High Range Indicator Control Circuit Open Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 2WD High range indicator control circuit. The 2WD High range indicator control circuit is made up of the indicator dimming control circuit and the 2WD High indicator control circuit. An open on the 2WD High indicator control circuit will cause this parameter to display Malfunction.
4WD Automatic Range Indicator Command	ON or OFF	OFF	This parameter displays ON when the transfer case control module commands the Auto 4WD indicator ON.
4WD Automatic Range Indicator Control Circuit High Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 4WD automatic range indicator control circuit. The 4WD automatic range indicator control circuit is made up of the indicator dimming control circuit and the AWD indicator control circuit. A short to battery on the AWD indicator control circuit will cause this parameter to display Malfunction.
4WD Automatic Range Indicator Control Circuit Low Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 4WD automatic range indicator control circuit. The 4WD automatic range indicator control circuit is made up of the indicator dimming control circuit and the AWD indicator control circuit. A short to ground on the AWD indicator control circuit will cause this parameter to display Malfunction.
4WD Automatic Range Indicator Control Circuit Open Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 4WD automatic range indicator control circuit. The 4WD automatic range indicator control circuit is made up of the indicator dimming control circuit and the AWD indicator control circuit. An open on the AWD indicator control circuit will cause this parameter to display Malfunction.
4WD High Range Indicator Command	ON or OFF	OFF	This parameter displays ON when the transfer case control module commands the 4WD High indicator light ON.
4WD High Range Indicator Control Circuit High Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 4WD High range indicator control circuit. The 4WD High range indicator control circuit is made up of the indicator dimming control circuit and the 4WD High indicator control circuit. A short to battery on the 4WD High indicator control circuit will cause this parameter to display Malfunction.
4WD High Range Indicator Control Circuit Low Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 4WD High range indicator control circuit. The 4WD High range indicator control circuit is made up of the indicator dimming control circuit and the 4WD High indicator control circuit. A short to ground on the 4WD High indicator control circuit will cause this parameter to display Malfunction.
4WD High Range Indicator Control Circuit Open Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 4WD High range indicator control circuit. The 4WD High range indicator control circuit is made up of the indicator dimming control circuit and the 4WD High indicator control circuit. An open on the 4WD High indicator control circuit will cause this parameter to display Malfunction.
4WD Low Range Indicator Command	ON or OFF	OFF	This parameter displays ON when the transfer case control module commands the 4WD Low indicator light ON.
4WD Low Range Indicator Control Circuit High Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 4WD Low range indicator control circuit. The 4WD Low range indicator control circuit is made up of the indicator dimming control circuit and the 4WD Low indicator control circuit. A short to battery on the 4WD Low indicator control circuit will cause this parameter to display Malfunction.
4WD Low Range Indicator Control Circuit Low Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 4WD Low range indicator control circuit. The 4WD Low range indicator control circuit is made up of the indicator dimming control circuit and the 4WD Low indicator control circuit. A short to ground on the 4WD Low indicator control circuit will cause this parameter to display Malfunction.
4WD Low Range Indicator Control Circuit Open Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the 4WD Low range indicator control circuit. The 4WD low range indicator control circuit is made up of the indicator dimming control circuit and the 4WD Low indicator control circuit. An open on the 4WD Low indicator control circuit will cause this parameter to display Malfunction.
Brake Pedal Position Sensor Signal	Active/Released	Released	The scan tool displays Inactive or Active depending on the state of the brake pedal.
Calculated Transfer Case Clutch Temperature	°C/°F	Varies	This parameter displays the estimated clutch temperature.
Control Module Voltage	0.0 to 25.5 V	Battery Voltage	This parameter displays the voltage measured by the transfer case control module at the battery positive voltage circuit.
Current Transmission Gear	Park, Reverse, Neutral, 1, 2, 3, 4, 5, and 6	Park or Neutral	This parameter displays the current estimated gear the transmission is in. The scan tool displays Park, Reverse, and Neutral when ignition ON and engine OFF. The scan tool displays Park, Reverse, Neutral, 1, 2, 3, 4, 5, and 6 when engine ON.
Display Dimming	0 to 100%	Varies	This parameter displays the interior dimming display level being supplied by the body control module to the transfer case shift control switch.
Engine Run Time	hh:mm:ss	Varies	This parameter displays the time since Engine Start.
Engine Speed	RPM	Varies	This parameter displays engine RPM.
Front Axle Engagement Actuator Command	Engaged or Disengaged	Disengaged	This parameter displays either Engaged or Disengaged. Engaged when the body control module is commanding Auto 4WD, 4WD, or 4WD Low ranges, and Disengaged when the body control module is commanding Neutral, or 2WD ranges.
Front Axle Engagement Actuator Control Circuit High Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the front axle engagement actuator control circuit. A short to battery on the front axle engagement actuator control circuit will cause this parameter to display Malfunction.
Front Axle Engagement Actuator Control Circuit Low Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the front axle engagement actuator control circuit. A short to ground on the front axle engagement actuator control circuit will cause this parameter to display Malfunction.
Front Axle Engagement Actuator Control Circuit Open Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the front axle engagement actuator control circuit. An open/high resistance condition on the front axle engagement actuator control circuit will cause this parameter to display Malfunction.
Front Axle Feedback Switch	Engaged or Disengaged	Disengaged	This parameter displays the actual status of the front axle. The parameter will display Engaged when the system is in Auto 4WD, 4WD, or 4WD Low modes, and Disengaged when the system is in Neutral, or 2WD High or Neutral mode.
Ignition 1 Signal	ON or OFF	ON	This parameter displays the status of the run/crank ignition 1 voltage circuit to the transfer case control module.
Ignition Accessory Signal	ON or OFF	ON	This parameter displays the status of the ignition accessory signal circuit to the transfer case control module.
Left Front Wheel Speed Sensor	Varies	0 km/h (0 MPH)	The scan tool displays km/h (MPH) depending on the current speed of the left front wheel speed sensor.
Left Rear Wheel Speed Sensor	Varies	0 km/h (0 MPH)	The scan tool displays km/h (MPH) depending on the current speed of the left rear wheel speed sensor.
Non-Driven Wheel Speed	Varies	km/h/MPH	This parameter displays the non-drive wheel speed in kilometers or miles per hour.
Power Mode	OFF, Accessory, Run or Crank Request	Run	This parameter displays the status of the ignition switch.
Range Actuator Command	-100 to +100%	0%	This parameter displays the pulse width modulated voltage signal being supplied by the transfer case control module to the transfer case encoder motor on circuit A or circuit B. The scan tool displays negative values when turning counter-clockwise or positive values when turning clockwise. This parameter will display 0% after a range shift.
Range Actuator Control Circuit High Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the range actuator control circuit. The range actuator control circuit is made up of the range actuator control circuit A and the range actuator control circuit B. A short to battery on the range actuator control circuit A or the range actuator control circuit B will cause this parameter to display Malfunction.
Range Actuator Control Circuit Low Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the range actuator control circuit. The range actuator control circuit is made up of the range actuator control circuit A and the range actuator control circuit B. A short to ground on the range actuator control circuit A or the range actuator control circuit B will cause this parameter to display Malfunction.
Range Actuator Control Circuit Open Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the range actuator control circuit. The range actuator control circuit is made up of the range actuator control circuit A and the range actuator control circuit B. An open on the range actuator control circuit A or the range actuator control circuit B will cause this parameter to display Malfunction.
Range Actuator Control Circuit Shorted Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the range actuator control circuit. The range actuator control circuit is made up of the range actuator control circuit A and the range actuator control circuit B. A short to ground, short to battery or short together on the range actuator control circuit A and/or the range actuator control circuit B will cause this parameter to display Malfunction.
Range Actuator Current	-15.0 to +36.0 A	0.0 A	This parameter displays the current drawn by the range actuator from the transfer case control module on either the range actuator control circuit A or the range actuator control circuit B. Typical values display 0.0 to 12.0 A. This parameter will display 0.0 A after shifting ranges.
Range Actuator Direction	Invalid, Stationary, Clockwise or Counter-clockwise	Stationary	This parameter displays what direction the transfer case range actuator is actually turning.
Range Actuator Direction Command	Invalid, Stationary, Clockwise or Counter-clockwise	Stationary	This parameter displays what direction the transfer case control module is commanding the range actuator to turn. This parameter will display Stationary after a range change.
Range Actuator Learn Status	Not Learned, Passed, Failed, Aborted, or In Progress	Passed	This parameter displays the status of the last range actuator learn attempt.
Range Actuator Lock Command	Disengaged or Engaged	Disengaged	This parameter displays the commanded status of the range actuator lock. The lock will be engaged in Auto 4WD, 4WD High, or 4WD Low, and Disengaged in 2WD High and Neutral.
Range Actuator Lock Control Circuit High Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the range actuator lock control circuit. The range actuator lock control circuit is made up of the battery positive voltage circuit and the transfer case lock solenoid control circuit. A short to battery on the transfer case lock solenoid control circuit will cause this parameter to display Malfunction.
Range Actuator Lock Control Circuit Low Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the range actuator lock control circuit. The range actuator lock control circuit is made up of the battery positive voltage circuit and the transfer case lock solenoid control circuit. A short to ground on the transfer case lock solenoid control circuit will cause this parameter to display Malfunction.
Range Actuator Lock Control Circuit Open Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the range actuator lock control circuit. The range actuator lock control circuit is made up of the battery positive voltage circuit and the transfer case lock solenoid control circuit. An open on the transfer case lock solenoid control circuit will cause this parameter to display Malfunction.
Range Actuator Position	2WD, 4WD High - 2WD 4WD High/Locked, 4WD High - Neutral, Neutral, Neutral - 4WD Low, or 4WD Low	2WD	This parameter displays the actual position of the transfer case according to the range actuator position sensor.
Range Actuator Position Sensor	- 150 to 210°	35°	This parameter displays the position of the range actuator position sensor in degrees. Typical scan tool displays: 2WD High = 20 - 50° 4WD Auto = 30 - 210° 4WD High = 110 - 210° 4WD Low = -150 to - 55° Neutral = -10 to +10°
Range Actuator Position Sensor	0.35 - 4.6 V	Varies	This parameter displays the voltage being returned from the range actuator position sensor. The range actuator position sensor is also known as the incremental position sensor.
Range Actuator Position Sensor Direction Signal	Volts	Varies	Range Actuator Direction Signal A/D - 8 Volt Reference
Range Actuator Position Sensor Low Reference Command	ON or OFF	OFF	This parameter displays the commanded status of the range actuator position sensor low reference circuit.
Range Actuator Position Sensor Supply Voltage Command	ON or OFF	OFF	This parameter displays the commanded status of the range actuator position sensor supply voltage circuit.
Requested Transfer Case Clutch Torque	Y	Varies	This parameter displays the commanded torque to be held by the transfer case clutch.
Right Front Wheel Speed Sensor	Varies	0 km/h (0 MPH)	The scan tool displays km/h (MPH) depending on the current speed of the right front wheel speed sensor.
Right Rear Front Wheel Speed Sensor	Varies	0 km/h (0 MPH)	The scan tool displays km/h (MPH) depending on the current speed of the right rear wheel speed sensor.
Sensor Reference Voltage 1	4.8 - 5.2 V	5.0 V	This parameter displays the voltage being supplied by the transfer case control module to the transfer case range position switch.
Sensor Reference Voltage 2	7.75 - 8.25 V	8.0 V	This parameter displays the voltage being supplied by the transfer case control module to the range actuator position sensor. The range actuator position sensor is also known as the incremental position sensor.
Sensor Reference Voltage 3	4.8 - 5.2 V	5.0 V	This parameter displays the voltage being supplied by the transfer case control module to the transfer case range selector switch.
Service 4WD Indicator Command	ON or OFF	OFF	This parameter displays ON anytime a DTC sets.
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 control module. The scan tool displays an alphanumeric value.
Steering Wheel Angle	Steering wheel in straight position	-5 to +5°	The scan tool displays °. This is the current position of the steering angle sensor.
	Steering wheel turned left until stop	450 - 550°
	Steering wheel turned right until stop	-550 to -450°
Transfer Case Clutch Torque	Y	0.0	This parameter displays the estimated torque being held by the transfer case clutch.
Transfer Case Commanded Position	2WD, 4WD High/Locked, 4WD Low, Neutral or None	2WD	This parameter displays the current range commanded by the driver.
Transfer Case Neutral Range Indicator Command	ON or OFF	OFF	This parameter displays ON when the transfer case control module commands the Neutral indicator light ON.
Transfer Case Neutral Range Indicator Control Circuit High Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the transfer case neutral range indicator control circuit. The transfer case neutral range indicator control circuit is made up of the indicator dimming control circuit and the neutral indicator control circuit. A short to battery on the neutral indicator control circuit will cause this parameter to display Malfunction.
Transfer Case Neutral Range Indicator Control Circuit Low Voltage Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the transfer case neutral range indicator control circuit. The transfer case neutral range indicator control circuit is made up of the indicator dimming control circuit and the neutral indicator control circuit. A short to ground on the neutral indicator control circuit will cause this parameter to display Malfunction.
Transfer Case Neutral Range Indicator Control Circuit Open Test Status	Not Run, OK or Malfunction	OK	This parameter monitors the status of the transfer case neutral range indicator control circuit. The transfer case neutral range indicator control circuit is made up of the indicator dimming control circuit and the neutral indicator control circuit. An open on the neutral indicator control circuit will cause this parameter to display Malfunction.
Transfer Case Output Shafts Slip Speed	0 - 8, 192 RPM	Varies	This parameter displays the difference between the rotational speeds of the transfer case front and rear output shafts.
Transfer Case Range	Invalid, Neutral, 2WD, 4WD/AWD Automatic, 4WD High/Locked, 4WD Low, 4WD Unlocked	2WD	This parameter displays the current mode the transfer case is in, as indicated by the transfer case range position switch.
Transfer Case Range Position Sensor	°	35°	This parameter displays the position of the rotational position sensor in degrees.
Transfer Case Range Position Sensor	190 - 210 Hz	199 Hz	This parameter displays the frequency of the current being supplied to the range position sensor.
Transfer Case Range Position Sensor	0 - 100%	24% (±5%)	This parameter displays the position of the range position sensor in percent. Typical scan tool values: 2WD = 24% 4WD High = 5% 4WD Low = 95% Neutral = 5%
Transfer Case Range Selection Switch	0.0 - 5.0 V	2.0 V (±0.2 V)	This parameter displays the voltage being returned from the transfer case range selection switch. Typical scan tool displays: 2WD = 2.0 V 4WD High/Locked = 3.0 V 4WD Low = 1.5 V Neutral = 2.5 V
Transfer Case Range Selection Switch State	2WD, 4WD High/Locked, 4WD Low, Neutral or None	2WD	This parameter displays the current range commanded by the transfer case range selection switch. This parameter displays the transfer case shift control switch mode currently selected by the driver.
Transmission Fluid Temperature	°C (°F)	Varies	This parameter displays the transmission fluid temperature in degrees Celsius or Fahrenheit.
Transmission Gear	Park, Reverse, Neutral, 1, 2, 3, 4, 5, and 6	Park or Neutral	This parameter displays the current commanded gear the transmission is in. The scan tool displays Park, Reverse and Neutral when ignition ON and engine OFF. The scan tool displays Park, Reverse, Neutral, 1, 2, 3, 4, 5, and 6 when engine ON.
Transmission OSS	RPM	Varies	This parameter displays transmission output shaft speed in revolutions per minute.
Variation Allowed Between Transfer Case Range Position Sensor and Range Actuator Position Sensor	°	Varies	This parameter displays the allowed variation between transfer case range position sensor and the range actuator position sensor.
Variation Between Transfer Case Range Position Sensor and Range Actuator Position Sensor	°	Varies	This parameter displays the actual variation between transfer case range position sensor and the range actuator position sensor.
Vehicle Speed	0 - 327 km/h (0 - 204 MPH)	Varies	This parameter displays vehicle speed in kilometers or miles per hour.
Vehicle Stability Control Request	%	Varies	Vehicle stability enhancement system coupling request value
Vehicle Identification Number	-	Varies	A unique 17 character vehicle identifier

Scan Tool Output Controls

Output Control	Description
NOTE: 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 Range Indicator	This function allows the technician to command the 2WD High range indicator, within the transfer case control switch, ON or OFF.
4WD Automatic Range Indicator	This function allows the technician to command the 4WD Auto range indicator light, within the transfer case control switch, ON or OFF.
4WD High Range Indicator	This function allows the technician to command the 4WD High range indicator, within the transfer case control switch, ON or OFF.
4WD Low Range Indicator	This function allows the technician to command the 4WD Low range indicator, within the transfer case control switch, ON or OFF.
Front Axle Engagement Actuator	NOTE: Transmission must be in transmission Neutral for this output control to operate. This function allows the technician to command the front axle to engage or disengage.
Range Actuator (if equipped)	This function is intended to activate the range actuator control circuits. The range actuator control circuits can be commanded OFF or ON, in either the clockwise or counter-clockwise direction, to ensure all portions of the control module driver are operational. This device control can be operated with the actuator connected to verify actuator operation, or disconnected for circuit testing. The activation of this control must ensure the range actuator lock is activated as well to ensure actuator movement when the range actuator is plugged in. If the device control is activated with the range actuator plugged in, the range actuator shall return to the nearest legal range position after return to normal control.
Range Actuator Lock	NOTE: You may need to perform an ignition OFF in order to recover. This function allows the technician to command the range actuator lock to engage or disengage.
Range Actuator Learn	NOTE: This does not work in 2WD High. This function allows the technician to command the transfer case control module to relearn the clutch status after the range actuator, control module, or transfer case has been replaced.
Transfer Case Clutch Engagement	This function is used to override the clutch capacity command of the all wheel drive clutch output.
Transfer Case Range	This device control is used to override the transfer case range position.
Transfer Case Neutral Range Indicator	This function allows the technician to command the transfer case neutral range indicator, within the transfer case control switch, ON or OFF.