2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 937

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 937

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

Repair/Overhaul/MP 3023/3024-NQH - Transfer Case/Drive Chain, Drive Sprocket, and Driven Sprocket Cleaning and Inspection )

* High/Low Planetary Carrier Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP

3023/3024-NQH - Transfer Case/High/Low Planetary Carrier Cleaning and Inspection)

* High/Low Shift Components Cleaning and Inspection (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP

3023/3024-NQH - Transfer Case/High/Low Shift Components Cleaning and Inspection)

* Front Drive Axle Clutch Fork Inspection (See: Transmission and Drivetrain/Differential Assembly/Differential Lock/Service and

Repair/Front Drive Axle Clutch Fork Inspection)

* Transfer Case Disassemble (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3023/3024-NQH - Transfer

Case/Transfer Case Disassemble)

* Transfer Case Assemble (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Overhaul/MP 3023/3024-NQH - Transfer

Case/Transfer Case Assemble)

* Transfer Case Assembly Replacement (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Removal and Replacement/MP

3023/3024-NQH - Transfer Case/Transfer Case Assembly Replacement)

MP 3010-NP0 - Transfer Case

DTC C0398

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 C0398 5A

- Incremental Sensor - Rotational Position Sensor Correlation Plausibility Failure

Typical Scan Tool Data

Circuit/System Description

The transfer case incremental position sensor (IPS) and the transfer case two/four wheel drive actuator position sensor, also known as the rotational

position sensor (RPS), both send transfer case mode/range position information to the transfer case shift control module (TCCM). Both sensors

send this information as voltage signals which are converted to degrees by the TCCM software. If the two sensors disagree by greater than a

predetermined amount the DTC will set.

The IPS is more sensitive than the RPS, but needs to reference the RPS value at key-up and mode changes. The IPS is an integral part of the

transfer case actuator and cannot be replaced independently.

The RPS is an absolute sensor and is an independently replaceable part. The TCCM syncs the IPS with the RPS at key-up and mode changes.

Conditions for Running the DTC

* Ignition ON.

* System voltage 10.5-18 V.

Conditions for Setting the DTC

The incremental sensor and the rotational position sensor are both showing valid positions, but differ by greater than a predetermined amount when

NO mode change is in progress.

Action Taken When the DTC Sets

* Shifting disabled.

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