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2. Using a terminal test kit, connect the DMM between the VSS high signal and the VSS low signal circuits at the VSS connector. Raise and support the drive wheels. While rotating the If the AC voltage is not above 0.4 volts, replace the VSS. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Ensure that the VSS is 500 RPM or greater for 3 seconds and does not change more than Vehicle Speed Sensor Replacement Control Module References for ECM replacement, setup, and programming. SYMPTOMS - TRANSFER CASE Review the system operation in order to familiarize yourself with the system functions. Inspect the easily accessible or visible system components for obvious damage or conditions Inspect the automatic transfer case for the proper fluid level. Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Symptom List Refer to a symptom diagnostic procedure from the following list in order to diagnose the IMPORTANT: Perform the Diagnostic System Check - Vehicle before using the symptom tables, in order to verify the following conditions are There are no diagnostic trouble codes (DTCs) present. The control modules can communicate via the serial data
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Front Axle Will Not Engage Front Axle Will Not Disengage Transfer Case Shift Control Switch Inoperative Transfer Case Shift Control Switch Indicator Always On - Two or More Transfer Case Shift Control Switch Indicator Inoperative - One or More Service Indicator Always On Transfer Case High/Low Clutch Reset Transfer Case Popping Noise Transfer Case Whine or Rumble Noise Transfer Case Growl or Grinding Noise Transfer Case Clunk in 2HI Only Transfer Case Clunk in 4HI Transfer Case Clunk in 4LO Transfer Case Will Not Shift Transfer Case Jumps Out of Gear Transfer Case Leak Diagnosis FRONT AXLE WILL NOT ENGAGE Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. Circuit/System Description The front axle control circuit consists of an electric motor actuator which engages and disengages The front axle actuator consists of the following circuits: The front axle control circuit, which is also connected to the transfer case shift control
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
The front axle switch circuit, which is also connected to the transfer case shift control An ignition 3 voltage circuit A ground circuit When a shift to 4HI, or 4LO is requested, the transfer case shift control module engages the front Reference Information Schematic Reference Transfer Case Control Schematics Connector End View Reference Component Connector End Views Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Scan Tool Data List Scan Tool Data Definitions Circuit/System Testing 1. If this is occurring without DTC C0379 setting it is likely related to a mechanical issue. Refer to Four-Wheel Drive Does Not Engage . 2. If no mechanical issue is found replace the front axle actuator. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Control Module References for TCSCM replacement, setup, and programming Transfer Case High/Low Clutch Reset Four-Wheel Drive Does Not Engage Four-Wheel Drive Does Not Disengage Front Drive Axle Actuator Replacement FRONT AXLE WILL NOT DISENGAGE Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. Circuit/System Description The front axle control circuit consists of an electric motor actuator which engages and disengages The front axle actuator consists of the following circuits: The front axle control circuit, which is also connected to the transfer case shift control The front axle switch circuit, which is also connected to the transfer case shift control An ignition 3 voltage circuit A ground circuit When a shift to AUTO 4WD, 4HI, or 4LO is requested, the transfer case shift control module Reference Information Schematic Reference Transfer Case Control Schematics
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1625/1626-NQF - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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