2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 914

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 914

Diagnostic Procedures/MP 3010-NP0/Transfer Case High/Low Clutch Reset)

* Transfer Case Two/Four Wheel Drive Actuator Replacement (See: Powertrain Management/Transmission Control Systems/Actuators and

Solenoids - Transmission and Drivetrain/Actuators and Solenoids - Transfer Case/Transfer Case Actuator/Service and Repair/MP 3010-NP0

- Transfer Case/Transfer Case Two/Four Wheel Drive Actuator Replacement)

* Transfer Case Disassemble (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3010-NP0 - Transfer

Case/Transfer Case Disassemble)

* Transfer Case Assemble (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3010-NP0 - Transfer

Case/Transfer Case Assemble)

* Oil Pump Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3010-NP0 - Transfer

Case/Oil Pump Cleaning and Inspection)

* Rear Output Shaft Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3010-NP0 -

Transfer Case/Rear Output Shaft Cleaning and Inspection)

* Front Output Shaft and Input Shaft Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and

Repair/Overhaul/MP 3010-NP0 - Transfer Case/Front Output Shaft and Input Shaft Cleaning and Inspection)

* Drive Chain, Drive Sprocket, and Driven Sprocket Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and

Repair/Overhaul/MP 3010-NP0 - Transfer Case/Drive Chain, Drive Sprocket, and Driven Sprocket Cleaning and Inspection)

* Two/Four Wheel Drive Shift Components Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and

Repair/Overhaul/MP 3010-NP0 - Transfer Case/Two/Four Wheel Drive Shift Components Cleaning and Inspection)

* Transfer Case Front Half Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP

3010-NP0 - Transfer Case/Transfer Case Front Half Cleaning and Inspection)

* Transfer Case Rear Half Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP

3010-NP0 - Transfer Case/Transfer Case Rear Half Cleaning and Inspection)

MP 3023/3024-NQH - Transfer Case

DTC C0387

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC C0387 59

- Unable to Complete Shift Circuit

Diagnostic Fault Information

Circuit/System Description

The transfer case encoder motor (TCEM) is a bi-directional, permanent magnet, DC motor. When energized, through motor control A or motor

control B, the ground is provided by the opposing motor control circuit and then grounded through the transfer case shift control module (TCCM)

ground circuit, the TCEM, through a series of gears, rotates the transfer case control actuator shaft which moves the transfer case two/four wheel

drive actuator cam and transfer case high/low shift fork to shift the transfer case between the following modes or ranges:

* 2WD HI

* 4WD Auto

* 4WD HI

* 4WD LO

* Neutral

If the shift lever detent shaft were to bind, or there was a mechanical failure, or motor A control and motor B control were shorted together the shift

would not be completed. This will cause the DTC to set in order to protect system components from damage.

Conditions for Running the DTC

* Ignition ON.

* System voltage 10.5-18 V.