Symptom Chart - Four-Wheel Drive (4WD) System
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
FOUR-WHEEL DRIVE (4WD) SYSTEM SYMPTOM CHART
| 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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- CARRY OUT the All-Wheel Drive (AWD) System Functional Test. GO to PINPOINT TEST A .
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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 11 (10A)
- SJB
fuse 34 (5A)
- 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
- 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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