Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Theory Of Operation
Two Speed Transfer Case - Range Position Sensor
The Transfer Case Range Position Sensor is a serviceable component located on the right side of the Transfer Case. There are three circuits between the sensor and the (DTCM) Drivetrain Control Module:
- 5-Volt Supply
- Sensor Ground
- Signal
The Range Position Sensor transmits a PWM signal at 500hz to the DTCM on the Signal circuit. The PWM signal is relative to the position of the sensor plunger that contacts a Sense Plate that is attached to the Dual Drive Gear.
| Range Position | Minimum Duty Cycle (%) | Nominal Duty Cycle (%) | Maximum Duty Cycle (%) |
|---|---|---|---|
| HI Range (2WD, 4WD HI, 4WD Auto) |
6%* | 12.50% | 21% |
| Neutral | 40% | 50.0% | 58.0% |
| 4WD Lo | 77% | 87.50% | 96% |
*If RPS is reporting 4% or 5%, perform RPS re-seating procedure, sensor is OK.
The PWM signal can be converted to an average voltage that can be measured with a (DMM) Digital Multimeter.
| Range Position | Minimum Average Voltage | Nominal Average Voltage | Maximum Average Voltage |
|---|---|---|---|
| HI Range (2WD, 4WD HI, 4WD Auto) |
0.30v | 0.625v | 1.05v |
| Neutral | 2.00v | 2.50v | 2.90v |
| 4WD Lo | 3.85v | 4.375v | 4.8v |
2WD, 4WD HI, and 4WD Auto mode positions are determined by two hall effect sensors inside the Shift Motor.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.