High voltage circuit

P0108 - Manifold Absolute Pressure/Barometric Pressure Circuit High Input
P0113 - Intake Air Temperature Circuit High Input
P0340 - Camshaft Position Sensor Circuit Malfunction

You'll notice none of these fault codes say to replace parts or that one is bad. Fault codes only indicate the circuit or system that needs further diagnosis or the unacceptable operating condition. When a part is referenced in a fault code, as they are in these three, they are only the cause of those codes about half of the time. First we have to rule out wiring and connector terminal problems, and mechanical problems associated with those sensors.

In this case the clue is the first two sensors share a common ground wire, and the camshaft position sensor may share it too. Temperature sensors have an extremely low failure rate because there's just one part inside them. It is much more common to have a wiring problem with their circuits. The only way to set a "high input" fault code is to have a break in the ground circuit. That break can be in a wire, a splice, a connector terminal, or inside a sensor itself. A break inside a sensor is the least likely suspect, and when two or three sensor circuits set the same fault code, it is almost a certainty the cause is a wiring problem.

The intake air temperature sensor has very little effect on fuel metering calculations, but on Chrysler engines, the MAP sensor is the most important sensor for fuel. When a problem is detected with its readings, the Engine Computer will disregard them, and inject approximate values to run the engine on. You will have less-than-perfect performance, but the engine will run. When the problem is intermittent, the engine may run better when the problem goes away, but on some models the computer will stay in that back-up mode until you turn the ignition switch off, and restart the engine.

If the problem exists all the time, you can test the circuits yourself with a digital voltmeter. The intake air temperature sensor has a ground wire that will measure 0.2 volts, and a signal wire that should be between 0.5 and 4.5 volts. Typically you'll find around 2.5 to 2.8 volts. The exact value is not important, ... As long as it is not 0.0 or 5.0 volts. If you find 5.0 volts, there's a break in the ground wire. You can see the same thing by measuring the signal wire, then watching the voltage jump up to 5.0 volts when you unplug it. (For these readings to be accurate, the sensors always have to be plugged in. Back-probe the wires through the rubber seals in the back of the plugs to take the readings). The ground wire for both sensors is black / blue, (black with a blue stripe).

The MAP sensor uses three wires. That ground wire again has 0.2 volts, the feed wire will have 5.0 volts, and the signal wire will be around 4.2 to 4.4 volts with the ignition switch on and the engine not running. That voltage represents barometric pressure. With the engine running, the signal voltage will drop to around 1.2 to 1.5 volts. It's measuring intake manifold vacuum which is an indicator of engine load. If there's a break in the ground circuit, the signal voltage will jump close to 5.0 volts. Anything over 4.5 volts is what triggers the fault code P0108. Measure the voltage on the ground wire to see if you have the proper 0.2 volts, or something higher. If it's higher, the ground wire has to be inspected to find the break.

All of these fault codes can be set when the problem is intermittent. Even though the problem may go away temporarily, the fault codes stay in memory so they can be read. You need a scanner with record capabilities to catch the intermittent problem. When it occurs, you press the "record" button. That records about five seconds of sensor data that you can play back slowly, later, to see what happened. Because that data passes through the scanner's memory, the recording actually begins a couple of seconds before you pressed the "record" button.

You may see the signal voltages pop up to 5.0 volts during the momentary glitch, but that still doesn't tell you why. It does show you why those fault codes are being set. For your problem, you already have the fault codes to tell you what the scanner would tell you, and you have the symptoms to tell when the problem is occurring.