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.
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HOMESERVICE MANUALSLINCOLN2008NAVIGATOR RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 1 (FOUR WHEEL DRIVE (4WD) SYSTEMS)
2008 Lincoln Navigator RWD
Section 1 (Four Wheel Drive (4WD) Systems)
2008 Lincoln Navigator RWDSECTION Section 1 (Four Wheel Drive (4WD) Systems)
WARNING: This page is about a different variant/trim than selected.
- Description And Operation
- Diagnostic Tests
- Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand
- Notes
- Principles of Operation
- Inspection and Verification
- 4X4 Control Module DTC Chart
- Symptom Chart - Four-Wheel Drive (4WD)
- Symptom Chart - NVH
- Pinpoint Tests
- Pinpoint Test A: DTC B1555
- Pinpoint Test B: DTC B1317/B1318
- Pinpoint Test C: The Front Axle Does Not Engage/Disengage Correctly
- Pinpoint Test D: The Vehicle Does Not Shift Between 4X4 AUTO and 4X4 Modes Correctly
- Pinpoint Test E: Four-Wheel Drive (4WD) Does Not Engage at Speed Correctly
- Pinpoint Test F: Four-Wheel Drive (4WD) System Jumps Out of Gear
- Pinpoint Test G: Straight-line Driveline Wind-up
- Pinpoint Test H: The Front Axle Makes Noise in 2H Mode Only and Generally Under Heavy Throttle
- Pinpoint Test I: The Vehicle Has No Torque or Inadequate Torque at Rear Wheels in 4X4 AUTO Mode
- Pinpoint Test J: The Four-Wheel Drive (4WD) Indicators Do Not Operate Correctly/Do Not Operate
- Pinpoint Test K: The Vehicle Binds in Turns/Resists Turning/Pulsates/Shudders in a Straight Line
- Four Wheel Drive (4WD) Systems - 2-Speed Torque-On-Demand
- Notes
- Principles of Operation
- Inspection and Verification
- 4X4 Control Module DTC Chart
- Symptom Chart - Four-Wheel Drive (4WD)
- Symptom Chart - NVH
- Pinpoint Tests
- Pinpoint Test L: DTC B1555
- Pinpoint Test M: DTC B1317/B1318
- Pinpoint Test N: The Front Axle Does Not Engage/Disengage Correctly
- Pinpoint Test O: The Vehicle Does Not Shift Between 4A (4X4 AUTO) and 4H (4X4) Modes Correctly
- Pinpoint Test P: The Vehicle Does Not Shift Between 4H (4X4) and 4L (4X4 LOW) Modes Correctly
- Pinpoint Test Q: 4WD Does Not Engage at Speed Correctly
- Pinpoint Test R: The Four Wheel Drive (4WD) System Jumps Out of Gear
- Pinpoint Test S: Straight-line Driveline Wind-up
- Pinpoint Test T: The Front Axle Makes Noise in 2H Mode Only and Generally Under Heavy Throttle
- Pinpoint Test U: Four-Wheel Drive (4WD) System Functional Test
- Pinpoint Test V: The 4X4 Mode Indicators Do Not Operate Correctly/Do Not Operate
- Pinpoint Test W: Vehicle Binds in a Turn/Resists Turning/Pulsates in a Straight-line in 4WD Mode
- Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand
- Removal And Installation
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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.