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.
Pinpoint Test J : Electronic Shift-On-The-Fly (ESOF) System Functional Test: Notes
Normal Operation
When operating in 4H or 4L mode, the transfer case and both continuous vacuum hub (CVH)s are locked. When in 4L mode, the transfer case low range gear set provides an additional 2.64:1 gear reduction. When operating in 2H (4X2) mode, the transfer case and both CVHs are unlocked.
Possible Sources
- 4WD system and/or related components
- No communication with the IPC
- Transfer case and related components
- Wheel/tire assemblies
NO RELATED
Use the Manual With the Right Hardware
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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.