U | Network Code — Problem is climate control system, lighting, airbags, etc. |
0 | SAE — Generic |
4 | Fuel And Air Metering (Injector Circuit Malfunctions Only) |
0 | Air Conditioning (A/C) Clutch Feedback Circuit High Voltage |
1 | PCM Stack Overrun |
The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. U0401 Ford Ranger code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.
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