NVG 126-NP4 - Transfer Case

DTC C0300

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.



DTC Descriptor
DTC C0300
- Rear Speed Sensor Malfunction




Circuit/System Description

The rear propshaft speed sensor is a permanent magnet generator. The permanent magnet generator produces a pulsing AC voltage. The AC voltage level and number of pulses increase as speed increases. The module converts the pulsating AC voltage to a propshaft RPM which is used for calculations. The propshaft RPM can be displayed with a scan tool.


This DTC detects an open, short to ground, short to voltage, or faulty sensor.


Conditions for Running the DTC

* The ignition is ON.
* System voltage is 9-18 volts.
* Vehicle speed exceeds 16 km/h (10 mph).



Conditions for Setting the DTC

The system logs the DTC if the rear propshaft input indicates a speed of less than 16 RPM for 30 seconds while all of the following are true:

* The transmission is NOT in PARK/NEUTRAL.
* The engine is running.
* Vehicle Speed On Class 2 Data bus exceeds 16 km/h (10 mph).



Action Taken When the DTC Sets

* All shifts to AUTO, Adapt mode are disabled. If the current mode is AUTO, the system does not allow any further adaptive events, correct slip.
* The SERVICE AWD indicator remains illuminated for the remainder of the current ignition cycle.



Conditions for Clearing the DTC

* The transfer case shift control module clears the DTC if the condition for setting the DTC no longer exists.
* A history DTC clears after 100 consecutive ignition cycles without a fault present.
* History DTCs can be cleared using a scan tool.



Reference Information
Schematic Reference

Transfer Case Control Schematics (NVG 126-NP4 - Transfer Case)
Connector End View Reference

Component Connector End Views
Description and Operation

Transfer Case Description and Operation (NVG 126-NP4 - Transfer Case)
Electrical Information Reference

* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs

Scan Tool Reference

* Scan Tool Output Controls (Scan Tool Output Controls)
* Scan Tool Data List (Scan Tool Data List)
* Scan Tool Data Definitions (Scan Tool Data Definitions)



Circuit/System Verification

TBD


Circuit/System Testing

TBD


Component Testing

TBD


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Repair Verification

TBD