The transfer case motor is a bi-directional, permanent magnet, D.C. motor. When energized, (through Motor Control A or Motor Control B, the ground is provided by the opposing motor control circuit and then grounded through the transfer case shift control module ground circuit), the motor, through a series of gears, rotates a shaft which moves the mode and range forks to shift the transfer case between 4H, 2H, N, and 4L ranges.
This DTC detects an open in the module ground circuit.
The system test the motor circuits:
• | All shifting will be disabled. |
• | The SERVICE 4WD indicator lamp will be commanded on for the remainder of the current ignition cycle. |
• | 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. |
The numbers below refer to the step numbers on the diagnostic table.
Listen for an audible motor noise when the transfer case encoder motor operates. Command both the ON and OFF states. Repeat the commands as necessary.
This step tests the motor ground circuit for an open.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: Transfer Case Control Schematics | |||
1 | Was the Transfer Case Diagnostic System Check performed? | Go to Step 2 | |
Does the transfer case encoder motor turn ON and OFF? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | |
Did you find and correct the condition? | Go to Step 5 | Go to Step 4 | |
4 | Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement . Did you complete the replacement? | Go to Step 5 | -- |
5 |
Does the DTC reset? | Go to Step 2 | System OK |