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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 A permanent magnetic motor A worm gear controlled plunger A front axle switch An electronic control circuit The front axle actuator consists of the following circuits: An ignition 3 voltage circuit A ground circuit An axle actuator control circuit An axle switch signal circuit Whenever a shift to 4WD is selected, the transfer case switch engages the front axle by grounding Reference Information Schematic Reference Transfer Case Control Schematics Connector End View Reference Component Connector End Views Electrical Information Reference Circuit Testing Connector Repairs
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1222/1225/1226-NQG - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Testing for Intermittent Conditions and Poor Connections Wiring Repairs Circuit/System Verification 1. Place the vehicle in 4WD install a scan tool and using engine data 2 look at the display for 4WD signal. 2. Verify that the scan tool indicates that the vehicle is in 4WD. If the scan tool indicates that the vehicle is in 2WD go to circuit system testing. Circuit/System Testing 1. Check the axle switch signal circuit for an open or high resistance. If everything checks normal then go to the next step. 2. Check the front axle actuator control circuit for an open or high resistance with the front axle actuator disconnected and the mode selection switch disconnected. If everything checks normal reconnect the mode selection switch and retest. If the Front Axle Actuator and Axle Testing Remove the actuator and attempt shift from 2WD to 4WD, if the actuator moves check the front If the actuator does not function properly then replace the front axle actuator. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Front Drive Axle Actuator Replacement Transfer Case Gear Indicator Switch Replacement Front Drive Axle Clutch Fork Inspection FOUR-WHEEL DRIVE INDICATOR ALWAYS ON Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1222/1225/1226-NQG - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 4WD indicator lamp is located in the instrument cluster. Ignition 3 voltage is supplied to the 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 Circuit/System Verification 1. Place the vehicle in 2WD install a scan tool and using engine data 2 look at the display for 2WD signal. 2. Verify that the scan tool indicates that the vehicle is in 2WD. If the scan tool indicates that the vehicle is in 4WD go to circuit system testing. Circuit/System Testing 1. Check the axle switch signal circuit for a short to voltage. If everything checks normal then go to the next step.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1222/1225/1226-NQG - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2. Check the front axle actuator control circuit pin B at the front axle actuator connector or pin C at the transfer case shift control switch for a short to ground. If everything checks normal then short the axle actuator control circuit to ground this Instrument Panel Cluster (IPC) and Engine Control Module (ECM) Functionality If all circuits referenced above check good use the scan tool under engine data 2 to see if the scan If the scan tool indicates the vehicle is in 4WD then replace the engine control module, if Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Instrument Cluster Replacement (without RPO SLT) Engine Control Module Replacement for the 4.3L engine Engine Control Module Replacement for the 4.8L, 5.3L, 6.0L, and 6.2L engine Engine Control Module Replacement for the 6.6L engine Control Module References for ECM replacement, setup, and programming Four-Wheel Drive Does Not Disengage Four-Wheel Drive Does Not Engage FOUR-WHEEL DRIVE INDICATOR INOPERATIVE 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 4WD indicator lamp is located in the instrument cluster. Ignition 3 voltage is supplied to the
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Transfer Case - MP 1222/1225/1226-NQG - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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