Circuit Description
The transfer case motor is a bi-directional, permanent magnet, DC motor. When energized, (through CKTs 1552, 1553 , and the ground CKT 2150, the module utilize for motor control), the motor, through a series of gears, rotates a shaft which moves the mode and range forks to shift the transfer case between 4H, Adapt, 2H, N, and 4L ranges.
This DTC detects a short to voltage on CKTs 1552 and 1553, or a shorted motor.
Conditions for Setting the DTC
| • | The system will test the motor circuits by reading the voltage on each circuit. |
| • | If the system detects a problem with the circuits, the DTC is logged. |
| • | The transfer case shift control module senses a high voltage on CKTs 1552 or 1553 when a low voltage is expected. |
Action Taken When the DTC Sets
| • | All shifting will be disabled. |
| • | The SERVICE indicator (AWD/4WD) lamp will be latched on for the remainder of the current ignition cycle. |
Conditions for Clearing the DTC
| • | The transfer case shift control module will clear the DTC if the condition for setting the DTC no longer exists. |
| • | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
| • | History DTCs can be cleared using a scan tool. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Transfer Case Diagnostic System Check performed? | -- | Go to Step 2 | |
Is the voltage reading greater than the specified value? | 0 V | Go to Step 3 | Go to Step 5 | |
3 |
Is the voltage reading greater than the specified value? | 0 V | Go to Step 4 | Go to Step 6 |
4 | Repair a short to voltage in CKT 1552. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 7 | -- |
5 | Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement . Is the repair complete? | -- | Go to Step 7 | -- |
6 | Repair a short to voltage in CKT 1553. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 7 | -- |
7 |
Are all the ATC components connected and properly mounted? | -- | Go to Step 8 | -- |
8 | Clear the all ATC DTCs. Are all the ATC DTCs cleared? | -- | -- |
