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DIAGNOSTIC STARTING POINT - TRANSFER CASE Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic 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 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 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 - This function allows the technician to command the 4WD High - This function allows the technician to command the 4WD Low - This function allows the technician to command the
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 Auto 4WD - This function allows the technician to command the Neutral Indicator - This function allows the technician to command the Scan Tool Parameter Data List Units Displayed Typical Data Value Operating Conditions: Engine is at idle, upper radiator hose is hot, closed throttle, 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 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 Transfer Case Data Volts Varies Mode Switch Selected Transfer Case Data Auto 4WD/2 High/4High/4 Low/Neutral 2 High Mode Switch Supply 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 4WD High Indicator Light This parameter displays On when the transfer case shift control module commands the 4WD 4WD Low Indicator Light This parameter displays On when the transfer case shift control module commands the 4WD 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 Auto 4WD Indicator Light This parameter displays On when the transfer case shift control module commands the auto 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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