Transfer Case Control Module Scan Tool Information
The Transfer Case Shift Control Module Scan Tool Data List contains all transfer case related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists and in some cases may appear more than once or in more than one data list in order to group certain related parameters together.
The values below represent a typical display recorded from a properly functioning system.
NOTE:
Do not use a scan tool that displays faulty data. Report the condition to the scan tool manufacturer. The use of a faulty scan tool can result in misdiagnosis and the unnecessary replacement of parts.
Only the parameters listed below are used/referenced in this manual for diagnosis. If a scan tool displays other parameters, those values are not recommended by General Motors for use in diagnosis.
If all values are within the expected range described below, refer to Symptoms - Transfer Case for diagnosis.
The scan tool values from a properly functioning transfer case may be used for comparison with the transfer case you are diagnosing. The values below represent a typical display recorded from a properly functioning system.
Scan Tool Data Parameters
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| Operating Conditions:
Engine at idle, upper radiator hose hot, closed throttle, gear in Park or Neutral, accessories OFF. This is a comprehensive list. Not all parameters listed are available for all applications. |
|||
| Accelerator Pedal Position | 0-100% | 0% | This parameter displays percentage of pedal depression. |
| Average Speed | km/h | 0 km/h | This parameter displays the vehicle speed in km/h. |
| AWD Minispare Disable | Yes/No | No | This parameter displays On when a minispare is present. |
| Base Model Part Number | Part Number | GM Part Number | This parameter displays an 8 digit GM part number. |
| Battery Voltage | Volts | Battery Voltage | This parameter displays battery voltage. |
| Calibration part Number | Part Number | GM Part Number | This parameter displays an 8 digit GM part number. |
| Calculated Clutch Temperature | Degrees C | Same as oil temperature | This parameter displays clutch temperature in degrees Celsius. |
| Clutch Coupling | 0-100% | 0% | This parameter displays the amount of clutch activation shown in percentage. |
| Clutch Overtemp Counter | 0 | Counts | This parameter displays the amount of clutch overtemps that have occurred. |
| Clutch Resistor Value | Volts Resistor Dependent | Volts | This parameter displays the return voltage or the signal voltage that comes back from the instrument panel switch. |
| Clutch Resistor Supply | 5 volts | Volts | This parameter displays the 5 volt reference being fed to the IP switch. |
| Clutch Temp. Sensor | 3.5 volts | Volts | This parameter displays temperature in voltage. |
| Clutch Torque | Varies | Y | This parameter displays the amount of torque in Y. |
| End Model Part Number | Part Number | GM Part Number | This parameter displays an 8 digit GM part number. |
| Left Front Wheel Speed | 0 km/h | km/h | This parameter displays the wheel speed in km/h. |
| Left Rear Wheel Speed | 0 km/h | km/h | This parameter displays the wheel speed in km/h. |
| Ignition Accessory Signal | On | On/Off | This parameter displays On or Off. |
| Ignition Run/Crank | On | On/Off | This parameter displays if the run/crank voltage is seen at the module. |
| Odometer | km | km | This parameter displays the vehicle mileage in km. |
| Requested Clutch Torque | Varies | Y | This parameter displays the amount of clutch torque being requested based on engine torque and accelerator position as well as other inputs. |
| Right Front Wheel Speed | 0 km/h | km/h | This parameter displays the wheel speed in km/h. |
| Right Rear Wheel Speed | 0 km/h | km/h | This parameter displays the wheel speed in km/h. |
| Service AWD Indicator | No | Yes/No | This parameter displays On if the transfer case shift control module commands the Service AWD Indicator On. The scan tool displays On or Off. |
| Software Part Number | Part Number | GM Part Number | This parameter displays the 8 digit part number. |
| Steering Wheel Angle | Varies | Degrees | This parameter displays the current position of the steering wheel in degrees. |
| Trans. Fluid Temp | Varies | Degrees C | This parameter displays the transmission fluid temperature in degrees Celsius. |
| Transfer Case Position | Auto 4WD | Auto 4WD/2WD | This parameter displays the current mode of the transfer case AWD/2WD. |
| Transfer Case Oil Temp | Varies | Degrees C | This parameter displays the transfer case oil temperature in degrees Celsius. |
| Transfer Case Clutch Command | 0% | 0-100% | This parameter displays the amount in percentage of clutch activation being requested. |
| Transmission OSS | 0 km/h | km/h | This parameter displays vehicle speed. |
| TR Switch Status | Varies | 1st-6th gears | This parameter displays the current range the transmission is in. |
| Vehicle Speed | 0 km/h | km/h | This parameter displays vehicle speed in kilometers per hour. |
| Warm-Ups Since Last DTC | 0 Counts | Counts | This parameter displays the amount of warm up cycles since a current DTC was set. |
Scan Tool Output Controls
| Output Control | Description |
|---|---|
| Refer to the scan tool manual for complete scan tool operating instructions. | |
| Clutch Control | This function allows the technician to command the clutch coil high side driver on or off. |
| Clutch Coupling Request | This function allows the technician to command the clutch coil to be energized from 0-100 percent PWM. |
| Clutch Return | This function allows the technician to command the clutch coil low side driver on or off. |
| Transfer Case Clutch | This device control is intended for use on an all wheel drive system to activate the clutch control solenoid. Both the low side and high side of the clutch solenoid are controlled together. Commanding the clutch solenoid to "on" will modulate the high side driver to a calibratable "maximum" duty cycle. |
| Transfer Case Clutch Engagement | This device control is used to override the clutch capacity command of the all wheel drive clutch output. |
| Transfer Case Clutch Identifier | This function is used to select the value associated with the torque characteristics of the transfer case clutch. |
| Transfer Case Clutch Overtemperature Counter Reset | This device control is used to reset the transfer case clutch overtemperature event counter. |
| Reset Clutch Overtemp Counter | This function allows the technician to command the over temperature counter to be zeroed. |
| Vehicle Model | This function is used to select the model of vehicle the transfer case control module was installed in. There are calibrations differences between models and since the controller is not programmed in service, this DID allows the technician to select the appropriate calibration for the application. |