Symptom Chart: Four-Wheel Drive Systems - 1 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 .
| Symptom | Possible Sources | Action |
|---|---|---|
| Unable to duplicate customer concern. All other 4WD system concerns not listed below. | 4WD system and/or related components | PERFORM the Four-Wheel Drive (4WD) System Functional Test. GO to Pinpoint Test A |
| No communication with the TCCM | 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 . |
| No communication with the ATCM | Scan tool BJB fuse Power supply circuit BJB fuse Ground circuit HS-CAN DLC ATCM Wiring, terminals or connectors Charging system |
PERFORM Pinpoint Test for No ATCM communication. REFER to: Communications Network . |
| The front axle does not engage/disengage correctly | IWE IWE solenoid Vacuum leaks |
GO to Pinpoint Test E |
| Unable to achieve flat tow (neutral tow) mode | Wiring, terminals or connectors HS-CAN IPC TCCM Ignition switch and/or circuitry Door ajar switch |
REFER to: Neutral Flat Tow Activation and Deactivation . |