C0374
DTC C0374
Circuit Description
The transfer case shift control module senses rear slip. After several attempts of applying torque to the front wheels, by activating the encoder motor, the transfer case still sees a difference in speed between the front propshaft speed sensor and rear propshaft speed sensor.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0374 General System Malfunction
Conditions for Running the DTC
^ The ignition is ON.
^ The system voltage is 9 - 18 volts.
Conditions for Setting the DTC
The transfer case shift control module is unable to correct sensed wheel slip for 10 consecutive seconds.
Action Taken When the DTC Sets
^ All shifts to AUTO 4WD Mode are disabled. If the current mode is AUTO 4WD, the system will not allow any further adaptive events, such as correcting slip.
^ The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.
Conditions for Clearing the DTC
^ A history DTC will clear after 100 consecutive ignition cycles without a fault present.
^ Use a scan tool in order to clear history and current DTC's.
Diagnostic Aids
If DTC's C0300 or C0305 have set, diagnose these DTC's first as they may cause DTC C0374 to set falsely. Refer to DTC C0300 or DTC C0305 . C0300 C0305
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the rear propshaft speed sensor and wiring are operating properly.
3. This step determines if the front propshaft speed sensor and wiring are operating properly.
4. This step determines if the motor control A or motor control B circuits are shorted to ground within the encoder motor.
5. This step tests the integrity of the motor windings.
6. This step tests the motor control A and motor control B circuits for an open, short to ground, or high resistance between the encoder motor and the transfer case shift control module.
7. This step determines whether the transfer case is mechanically functioning properly.
