Symptom Chart: Four-Wheel Drive Systems - 2 Speed Torque on Demand
WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
Four-Wheel Drive Systems
| Symptom | Possible Sources | Action |
|---|---|---|
| Unable to duplicate customer concern. | 4WD system and/or related components | GO to Pinpoint Test A |
| No communication with the TCCM | Scan tool DLC TCCM Wiring, terminals or connectors |
REFER to: Communications Network - System Operation and Component Description
. Perform Pinpoint test for no TCCM communication. |
| No communication with the 4x4 Switch Module | Scan tool BJB fuse power supply circuit BJB fuse Ground circuit HS-CAN DLC TCCM Wiring, terminals or connectors Charging system |
Perform Pinpoint test for no TCCM communication. REFER to: Communications Network - System Operation and Component Description . |
| The front axle does not engage/disengage correctly | IWE IWE solenoid Vacuum leaks |
GO to Pinpoint Test E |
| The shift motor does not operate correctly | Wiring, terminals or connectors Transfer case TCCM Shift motor |
GO to Pinpoint Test G |
| Unable to achieve flat tow (neutral tow) mode | Wiring, terminals or connectors HS-CAN IPC TCCM Door ajar switch Ignition switch |
REFER to: Neutral Flat Tow Activation and Deactivation . |