P0113 - Intake Air Temperature Circuit High Input
Actually, the sensor is the last thing to suspect for this fault code. There is only one component in it, that's a temperature-dependent resistor, (thermistor), and failure is extremely rare. As you can see by this code description, fault codes never say to replace parts or that they're bad. They only indicate the circuit that needs further diagnosis or the unacceptable operating condition. For this circuit you're most likely to find a stretched terminal in a connector, a corroded connector pin, or a break in one of the wires. Anything that creates an "open circuit", meaning it has a break in it, will result in the computer seeing 5.0 volts on the signal wire, and that's what sets that code. In a properly-working circuit, the voltage will always stay between 0.5 and 4.5 volts.
If you have a scanner to view live data, it will show 5.0 volts for this sensor, but the next step requires an inexpensive digital voltmeter. It's important to understand that voltage readings in this circuit are only valid when the sensor is not disconnected, so you have to back-probe the terminals through the rubber seals where the wires go in. Measure the voltages on both sensor wires and list them here. Normally you will find 0.2 volts on the ground wire and typically between 1.0 and 4.0 volts on the signal wire. Knowing what you have on each wire will tell us where to go next.
Nov 29, 2014 at 6:54 PM
