Symptom Chart - Four-Wheel Drive Systems
Diagnostics in this service information assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
In most circumstances, the PCM sets DTCs to help guide with diagnostics. Refer to the DTC Chart before using the symptom chart below. The Symptom column lists the vehicle condition. The Possible Sources column lists a detailed vehicle condition. The Action column lists the action to be performed to determine the cause of the condition. Each action lists the components that can cause the system and the individual components in that system. The components are listed in order of disassembly. Use the list of components and the required action to focus on disassembly inspections for the root cause of the concern.
| Condition | Possible Sources | Actions |
|---|---|---|
| Unable to duplicate customer concern; no DTC present | The concern description is inaccurate | CARRY OUT the AWD System Functional Test. GO to Pinpoint Test A |
| Vehicle has no or inadequate torque at rear wheels | Fuse Wiring, terminals or connectors Active Torque Coupling (ATC) solenoid Active Torque Coupling (ATC) Clutch AWD Relay Module PCM |
GO to Pinpoint Test C |
| Wheels/tires | Check wheels and tires for damage. REFER to: Wheels and Tires . | |
| Rear axle | Check rear axle for damage. REFER to: Rear Drive Axle and Differential . | |
| PTU mechanical failure | Check PTU for damage. REFER to: TRANSFER CASE - 2.0L EcoBoost (184kW/250PS) - MI4. REFER to: TRANSFER CASE - 2.7L EcoBoost (238kW/324PS). REFER to: TRANSFER CASE - 3.5L Duratec (212kW/278PS). | |
| Vehicle binds in a turn or resists turning/pulsates or shudders in a straight line | Wheels/tires | Check wheels and tires for damage. REFER to: Wheels and Tires . |
| Wiring, terminals or connectors | GO to Pinpoint Test E | |
| Driveshaft | Check driveshaft for damage. REFER to: Driveshaft . | |
| Wiring, terminals or connectors Active Torque Coupling (ATC) solenoid Active Torque Coupling (ATC) Clutch AWD Relay Module |
GO to Pinpoint Test E | |
| PTU mechanical failure | Check PTU for damage. REFER to: TRANSFER CASE - 2.0L EcoBoost (184kW/250PS) - MI4. REFER to: TRANSFER CASE - 2.7L EcoBoost (238kW/324PS). REFER to: TRANSFER CASE - 3.5L Duratec (212kW/278PS). | |
| Driveshaft | Check driveshaft for damage. REFER to: Suspension System . | |
| Wheel bearings | Check wheel bearings for damage. REFER to: Suspension System . | |
| ABS | CHECK the ABS. REFER to: Anti-Lock Brake System (ABS) and Stability Control . | |
| - | Halfshafts | Check the halfshafts for damage. REFER to: Rear Drive Halfshafts . |
| Tire/axle out of acceptable range | Wheels/tires ABS |
GO to Pinpoint Test B |