Here's what the code likely means and how to troubleshoot it:
* Low Voltage: The most common cause is a faulty IAT sensor itself. It might be failing to produce a proper voltage signal.
* Open or Short Circuit: There could be a break in the wiring (open circuit) leading to the sensor, or a short to ground or power. This often happens due to damaged wiring, corrosion in connectors, or a rodent chewing on the wires.
* Faulty Connector: The connector itself might be corroded or loose, preventing a good electrical connection.
* Rarely: A faulty PCM (though less likely than sensor or wiring problems).
Troubleshooting Steps:
1. Locate the IAT Sensor: Find the IAT sensor on your 1998 Ford Contour. It's usually located in the intake air tube, often close to the air filter housing. Consult a repair manual or online resources specific to your vehicle's year and engine for the precise location.
2. Visual Inspection: Carefully inspect the sensor's connector for corrosion, loose connections, or any signs of damage. Clean the connector with electrical contact cleaner if needed.
3. Check the Wiring: Visually inspect the wiring harness leading to the IAT sensor for any signs of damage, fraying, or breaks. Pay attention to where the wiring might rub against other parts of the engine.
4. Check Sensor Resistance (If you have a multimeter): Disconnect the IAT sensor and use a multimeter to check its resistance. Your repair manual should specify the correct resistance range for your sensor at room temperature. A value significantly outside this range indicates a faulty sensor.
5. Check Sensor Voltage (If you have a multimeter): With the sensor connected, check the voltage signal it's sending to the PCM. Again, your repair manual will provide the specifications for this.
6. Replace the IAT Sensor: If the sensor, wiring, or connector is found to be faulty, replace the sensor. It's a relatively inexpensive and easy part to replace.
7. Clear the Code: After making any repairs, use an OBD-II scanner to clear the trouble code from the PCM's memory. Then, drive the car for a while to see if the code returns.
Important Notes:
* Repair Manual: A repair manual specific to your 1998 Ford Contour will be incredibly helpful in this process. It will provide detailed diagrams, specifications, and procedures.
* Safety: Always disconnect the negative battery terminal before working on any electrical components.
* Professional Help: If you're not comfortable working on your car's electrical system, it's best to take it to a qualified mechanic.
By systematically checking these items, you should be able to pinpoint the cause of the P0117 code and get your Ford Contour running smoothly again. Remember to always consult your vehicle's repair manual for specific information and procedures.
