Chevrolet Silverado / GMC Sierra. Manual — part 2909
DIAGNOSTIC STARTING POINT - TRANSFER CASE
Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic
System Check will provide the following information:
The identification of the control module or modules that command the system.
The ability of the control module or modules to communicate through the serial data circuit.
The identification of any stored diagnostic trouble codes (DTCs) and the status of the codes.
The use of the Diagnostic System Check - Vehicle will identify the correct procedure for
diagnosing the system and where the procedure is located.
SCAN TOOL OUTPUT CONTROLS
DTC C0550
C0550 37: Electronic Control Unit Malfunction
Watchdog/Safety Failure
C0550 39: Electronic Control Unit Malfunction Internal
Electronic Failure
DTC C0569
C0569 4B: System Configuration Error Calibration Data Not
Learned
DTC C0896
C0896 03: Device Voltage Range Voltage Below Threshold
C0896 07: Device Voltage Range Voltage Above Threshold
DTC P2160 or P2161
P2160: Vehicle Speed Sensor (VSS) 2 Circuit Low Voltage
P2161: Vehicle Speed Sensor (VSS) 2 Circuit Intermittent
Scan Tool
Output Control
Additional Menu
Selections
Description
Refer to the scan tool manual for complete scan tool operating instructions.
IMPORTANT:
Transmission must be in transmission neutral for any of these output controls to operate.
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
-
This function allows the technician to command the
4WD low indicator light, within the transfer case
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
SCAN TOOL DATA LIST
Indicator Light
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.
Scan Tool Parameter
Data List
Units Displayed
Typical Data
Value
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
Transfer Case
Data
On/Off
On
4WD High Indicator Light
Transfer Case
Data
On/Off
Off
4WD Low Indicator Light
Transfer Case
Data
On/Off
Off
Accessory Status
Transfer Case
Data
Not Active/Active
Active
ATC Motor Init. Test
Transfer Case
Data
Not
Initialized/Passed/Failed/In
Progress
Passed
Auto 4WD Indicator Light
Transfer Case
Data
On/Off
On
Battery Voltage
Transfer Case
Data
Volts
Battery Voltage
Clutch Calibration Status
Transfer Case
Data
Not Learned/Initial
Learn/Normal Learn
Normal Learn
Clutch Coupling
Transfer Case
Data
0-100%
Varies
Transfer Case
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Front Axle Actuator
Data
Volts
Battery Voltage
Front Axle Actuator Status
Transfer Case
Data
Engaged/Disengaged
Disengaged
Front Axle Switch
Transfer Case
Data
Locked/Unlocked
Unlocked
Incremental Impulse Sensor
Transfer Case
Data
PWM Voltage
Varies
Incremental Position Sensor
Direction
Transfer Case
Data
Clockwise/Counter
Clockwise
Varies
Incremental Position Sensor
Transfer Case
Data
Degrees
Varies
Incremental Position Sensor
Transfer Case
Data
Volts
Varies
Mode Switch Return
Voltage
Transfer Case
Data
Volts
Varies
Mode Switch Selected
Transfer Case
Data
Auto 4WD/2 High/4High/4
Low/Neutral
2 High
Mode Switch Supply
Voltage
Transfer Case
Data
Volts
5 Volts
Motor Brake
Transfer Case
Data
Volts
Battery Voltage
Neutral Indicator Light
Transfer Case
Data
On/Off
Off
Rotational Position Sensor
Transfer Case
Data
Degrees
Varies
Rotational Position Sensor
Transfer Case
Data
Volts
Varies
Run/Crank
Transfer Case
Data
Active/Inactive
Active
Software Part Number
Transfer Case
Data
GM Part Number
Current Software
Release
Transfer Case Lock
Transfer Case
Data
Engaged/Disengaged
Disengaged
Transfer Case Motor
Transfer Case
Data
Amperage
0 Amps
Transfer Case Position
Transfer Case
Data
Current Transfer Case
Mode or Range
2 High
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
SCAN TOOL DATA DEFINITIONS
2WD High Indicator Light
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
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
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
This parameter displays Not Active, and Active.
ATC Motor Init. Test
This parameter displays Not Initialized, Passed, Failed, or in Progress when the key off
initialization sequence has occurred.
Auto 4WD Indicator Light
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
This parameter displays the voltage measured by the transfer case shift control module at the
Trans. Fluid Temp
Transfer Case
Data
Degrees C
Varies
TR Switch Status
Transfer Case
Data
Current Transmission Gear
Park
Vehicle Speed
Transfer Case
Data
km/h
Varies
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - MP 3023/3024-NQH - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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