Symptom Chart - Four-Wheel Drive (4WD) System
WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
Symptom Chart - Four-Wheel Drive (4WD) System
| Condition |
Possible Sources |
Action |
- Unable to duplicate customer concern; no DTCs present
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- The concern description is inaccurate
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- Battery voltage is high/low (4X4 control module)
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- Concern with voltage regulator or generator
- Smart Junction Box (SJB) fuse 20 (7.5A)
- SJB fuse 28 (10A)
- Intermittent open power circuit
- 4X4 control module internal relay failure
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- 4X4 control module received no/invalid data from PCM
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- Invalid data received from PCM
- Data out of range
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- 4X4 control module received no/invalid data from ABS module
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- Invalid data received from the ABS module
- Data out of range
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- High Speed Controller Area Network (HS-CAN) communications bus fault
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- HS-CAN bus fault
- PCM fault
- ABS fault
- Instrument Cluster (IC) fault
- Transmission Control Module (TCM) fault
- 4X4 control module
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- Vehicle has no or inadequate torque at rear wheels
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- Power Transfer Unit (PTU) mechanical failure
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- Wheels/tires
- Active Torque Coupling (ATC) solenoid (part of rear axle)
- SJB fuse(s):
- 4X4 control module
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- Vehicle binds in a turn or resists turning/pulsates or shudders in a straight line
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- 4X4 control module
- ATC solenoid (part of rear axle)
- Circuitry
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- Tire/axle out of acceptable range
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- Wheels/tires
- Wheel speed sensors
- ABS module
- 4X4 control module
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