Symptom Chart - 4WD
WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
Symptom Chart - Four-Wheel Drive(4WD)
| Condition | Possible Sources | Action |
|---|---|---|
| No communication with the TCCM | Scan tool HS-CAN BJB fuse Power supply circuit BCM fuse Ground circuit TCCM Charging system |
REFER to Module Communications Network . |
| The 4WD indicators do not operate correctly/do not operate | IPC 4WD system fault HS-CAN TCCM Ignition switch and/or circuitry BCM fuse Circuitry |
GO to Pinpoint Test J . |
| 4WD does not engage at speed correctly | Transfer case clutch coil TCCM IWE |
GO to Pinpoint Test E . |
| The front axle does not engage/disengage correctly | MSS IWE IWE solenoid Transfer case Vacuum leaks TCCM Circuitry |
GO to Pinpoint Test C . |
| 4WD system jumps out of gear | Transfer case IWE vent MSS |
GO to Pinpoint Test F . |
| The vehicle has no torque or inadequate torque at front wheels in 4X4 AUTO mode | Transfer case Circuitry TCCM |
GO to Pinpoint Test I . |
| Unable to duplicate customer concern | 4WD indicator TCCM Transfer case and related components Wheel/tire assemblies |
CARRY OUT the 4WD System Functional Test. GO to Pinpoint Test I . |