This could be caused by several things:
* Faulty IAT Sensor: The sensor itself might be malfunctioning and not providing the correct voltage signal. This is the most common cause.
* Wiring Issues: A break, short, or corrosion in the wiring between the sensor and the PCM can also cause a low voltage reading.
* Poor Connection: A loose or corroded connection at either the sensor or the PCM connector could disrupt the signal.
* PCM Problem (less likely): In rare cases, a problem within the PCM itself could cause this code.
What to do:
1. Check the IAT Sensor: Locate the IAT sensor (usually near the intake manifold). Visually inspect it for damage. You might need a repair manual to locate it exactly.
2. Check the Wiring: Inspect the wiring harness connected to the IAT sensor for any breaks, chafing, or corrosion. Check the connections at both the sensor and the PCM.
3. Test the Sensor (if possible): You can use a multimeter to test the resistance of the IAT sensor to see if it's within the manufacturer's specifications. This often requires looking up the specifications in a repair manual.
4. Clear the Code: After addressing any potential problems, clear the diagnostic trouble code (DTC) using a scan tool and see if the code returns.
If you're not comfortable doing this yourself, it's best to take your Windstar to a qualified mechanic for diagnosis and repair. Ignoring the problem could lead to poor engine performance, fuel economy issues, and even engine damage.
