• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Invalid |
---|---|---|---|---|
Incremental Position Sensor Circuit | DTC C0396 02 | DTC C0396 04 DTC C0396 05 | DTC C0396 01 DTC C0396 05 | -- |
The transfer case shift control module has an input from incremental sensor which shows the speed, transfer case range, and direction of the transfer case mode or range shifts. The incremental sensor is an integral part of the transfer case actuator and can not be replaced independently. The incremental sensor indicates important information about the speed and direction of the transfer case two/four wheel drive actuator position. This sensor receives an 8-volt reference signal from the transfer case control module and gets this data back via the transfer case incremental impulse signal, as well as the incremental direction signal in order to know the current location.
• | The ignition is ON. |
• | System voltage is 10.5-18 volts. |
• | The transfer case control module sees a incremental 8-volt reference signal that is not between 1.5-8.2 volts indicating a short to ground or open if low and a short to voltage if high. |
• | The module does not receive a incremental impulse signal voltage between 0.5-4.6 volts. |
• | The incremental low reference circuit has an open or high resistance. |
• | All shifting is disabled until the condition no longer exists. |
• | The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle. |
• | The transfer case shift control module clears the DTC if the condition for setting the DTC is not currently present. |
• | A history DTC clears after 40 consecutive warm up cycles without a fault present. |
• | History DTCs can be cleared using a scan tool. |
Transfer Case Control Schematics
Control Module References for scan tool information
An open, high resistance, or short to voltage on the incremental sensor direction signal circuit will cause this DTC to set. If the sensor is determined to be bad the entire transfer case actuator will have to be replaced as the incremental sensor is part of the actuator and can not be replaced independently.
The incremental sensor impulse signal circuit, incremental direction signal circuit, incremental sensor low reference circuit, and the 8-volt reference circuit will need to be check for a short to ground, open, high resistance, and a short to voltage using the following steps:
⇒ | If the voltage does not read within the specifications then check the 8-volt reference circuit for a short to voltage, open, high resistance, or short to ground. If the circuit checks good and the voltage is out of range replace the transfer case control module, program, and perform the motor learn procedure. If the circuit checks good continue to next step. |
⇒ | If the voltage does not read 7.8-8.2 volts check the incremental impulse signal circuit for and open, high resistance, short to ground, or short to voltage. If the circuit checks good then go to the next step. |
⇒ | If all circuit test good replace the transfer case actuator and perform the motor learn procedure. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for TCSCM replacement, setup, and programming |