C0376

DTC C0376

Test 1-8:

Circuit Description
The front and rear propshaft speed sensor is a Permanent Magnet (PM) generator. The PM generator produces a pulsing AC voltage. The AC voltage level and number of pulses increases as speed increases. The module converts the pulsating AC voltage to a propshaft RPM, which is used for calculations. The module looks at these inputs together when the vehicle is in 4H, 4L, and AUTO 4WD range only. The propshaft RPM can be displayed with a scan tool.

This DTC detects greater than 10 percent difference in the speed sensor inputs.

Conditions for Running the DTC
^ The ignition is ON.
^ System voltage is 9 - 16 volts.

Conditions for Setting the DTC
The transfer case shift control module detects continued readings of front and rear propshaft speed signal which do not match. The module is unable to determine propshaft speed.
The system logs the DTC if the front and rear propshaft inputs indicates a speed greater than 10 percent difference for 40 seconds, while all of the following are true:
^ The transmission is NOT in PAR-NEUTRAL.
^ The engine is running.
^ The front axle is engaged,
^ The front propshaft indicates speed less than 120 km/h (75 mph).
^ The front propshaft or rear propshaft speed exceeds 512 RPM.
^ Vehicle Speed On Class 2 Data bus exceeds 16 km/h (10 mph).

Action Taken When the DTC Sets
^ All shifts to AUTO 4WD mode is disabled. If the current mode is AUTO 4WD, the system will not allow any further adaptive events, correct wheel slip.
^ The SERVICE 4WD 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 does not exist.
^ A history DTC clears after 100 consecutive ignition cycles without a fault present.
^ History DTCs can be cleared using a scan tool.

Test Description
The numbers refer to the step numbers on the diagnostic table.
3. This step helps determine if the transfer case speed sensors are operating properly.
4. This step tests to see if the DTC will set.
5. This step inspects for mismatches and whether speed sensors are wired correctly.
6. This step inspects the transfer case for mechanical failures.