Wednesday, July 24, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 607


* 2WD HI



* AWD/4WD Auto



* 4WD HI



* 4WD LO



* Neutral



Conditions for Running the DTC



* Ignition ON.



* System voltage 10.5-18 V.



Conditions for Setting the DTC



* The system constantly monitors the voltage on switch signal circuit.



* If the system detects a voltage level under 0.38 volts or greater than 4.86 volts for 60 seconds, the DTC is logged.



Action Taken When the DTC Sets



* All shifting is disabled.



* The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.



Conditions for Clearing the DTC



* The TCCM clears the DTC once the condition for setting the DTC is no longer present.



* A history DTC clears after 40 consecutive warm up cycles without a fault present.



* History DTCs can be cleared using a scan tool.



Diagnostic Aids



EL-49742 - harness is a good source for B+ and ground.



Reference Information



Schematic Reference



Transfer Case Control Schematics (See: Transmission and Drivetrain/Transfer Case/Diagrams/Electrical Diagrams/MP 3023/3024-NQH - Transfer



Case)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information.



Special Tools



* EL-49742 - Battery Voltage B+ and Ground Source Harness



* J 35616 - GM-Approved Terminal Test Kit



Circuit/System Verification



1. Key ON, engine OFF.



2. Connect a scan tool.



3. Verify that all mode selections of the transfer case shift control switch (TCSCS) match the following parameters in the Data Display feature of



the scan tool:



* Mode Switch Selected



* Transfer Case Position



* The corresponding Mode Indicator Light

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