Code P0113 = Intake Air Temperature Circuit High Input - Jeep Commander Forums: Jeep Commander Forum
 
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post #1 of 9 (permalink) Old 09-29-2009, 04:42 PM Thread Starter
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Code P0113 = Intake Air Temperature Circuit High Input

I just did the 30,000 service on my 2006. I initially installed some Bosch Platinum 2's, but after reading more on this forum, I decided to switch back to the stock Champions. After getting everything re-installed, the CEL is on, and it's throwing a P0113 code. Did a search here and nothing coming up. Google search turned up "Intake Air Temperature Circuit High Input" for a Wrangler and a Cherokee. Anyone know if it's the same for the Commander? What does it mean? I'll add that I did start the engine one time with the Bosch's installed just to pull it forward in my garage a bit. The CEL was on at that time, and is still on with the Champion's reinstalled.

Thanks for the help guys.

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post #2 of 9 (permalink) Old 09-29-2009, 04:50 PM
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I would check to see that you did not disturb the wires going to the temp sensor in the intake tube. Even unplug the sensor and plug it back in. If that doesn't work then you could always try the old disconnect the battery trick. Just wondering....Why did you choose to go back to the Champions?

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post #3 of 9 (permalink) Old 09-29-2009, 05:31 PM
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Quote:
Originally Posted by adamag25 View Post
I would check to see that you did not disturb the wires going to the temp sensor in the intake tube. Even unplug the sensor and plug it back in. If that doesn't work then you could always try the old disconnect the battery trick. Just wondering....Why did you choose to go back to the Champions?
X2

Maybe you forgot to plug the wires back in or something little like that. I reinstalled the OEM Champions too. Was getting worse gas mileage with both the NGK's and the E3's.




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post #4 of 9 (permalink) Old 09-29-2009, 06:03 PM
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P0113 = Intake Air Temperature Circuit High Input

What does that mean?

The powertrain control module (PCM) monitors the temperature of the air entering the engine. The PCM supplies a 5 volt reference voltage to the Intake Air Temperature (IAT) sensor. The IAT is a thermistor that varies resistance based on temperature. As the temperature increases, resistance decreases. Low temperature results in a high signal voltage. When the PCM sees a signal voltage higher than 5 volts, it sets this P0113 check engine light code.


Potential Symptoms

There will likely be no symptoms other than illumination of the Malfunction Indicator Lamp (MIL - Check Engine Light / Service Engine Soon).


Causes

A code P0113 may mean that one or more of the following has happened:

•Internally failed IAT sensor
•Faulty connection at IAT sensor
•Open in IAT ground circuit or signal circuit
•Short to voltage in IAT signal circuit or reference circuit
•IAT harness and/or wiring routed too close to high-voltage wiring (e.g. alternator, spark plug cables, etc.)
•Faulty PCM (less likely but not impossible)

Possible Solutions

First, if you have access to a scan tool, is there an IAT reading? If the IAT reading is logical then the problem is likely intermittent. If the reading is less than -30 degrees, unplug the connector. Install a jumper wire between the harness connector signal and ground circuits. The IAT temperature reading on the scan tool should be maxed out at the high end. For example it should be 280 degrees Farenheit or higher. If it is, the wiring is okay, and it may have been the connection. If it isn't install the jumper wire between the IAT signal circuit and the chassis ground. If now the IAT reading on the scan tool is maxed out then check for an open in the IAT ground circuit. If you get no reading at all on the scan tool, it's likely that the sensor signal is open or the 5 volt reference is missing. Check using a DVOM (digital volt ohm meter) for a 5 volt reference. If it's there, then unplug the connector at the PCM and check for continuity on the IAT signal circuit between the PCM connector and the IAT connector.

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post #5 of 9 (permalink) Old 09-29-2009, 10:45 PM Thread Starter
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Thanks a bunch guys.

I went back to the Champions after reading post after post about people getting worse gas mileage, the engine output "feeling" less, etc. etc. A bunch of folks said that Mopar engines just plain run better on Champions. I figured for a fraction of the cost, I'd just keep it simple.

So I re-checked all the wires to the AIT system. Everything was good (I had disconnected the sensor on the flex hose between the filter and the intake box, but that was firmly back in place). I then disconnected the battery and held the key on Start for a couple minutes. No more CEL. Ran the onboard DTC check and no code exists now. I'm good to go.

Thanks for the help guys!

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Last edited by BrandoCommando; 09-29-2009 at 10:55 PM.
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post #6 of 9 (permalink) Old 09-30-2009, 06:54 AM
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Glad to hear you have gotten it worked out. I have noticed that for almost every task on the XK you should remove the - battery terminal to avoid getting a check engine light.

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Code P0113

I got the check engine light after a tune up.
Could not reset it via battery disconnect.
Ends up, I NEVER RECONNECTED THE SENSOR WIRE ON THE AIRBOX.
After reconnecting, and then disconnecting the battery and re connecting after 5 mins I was all good.

I felt like a dummy, but I gained a OBD Reader in the process of diagnosis.
My frustration is your gain. So if you moved the air box to do plugs etc, check to make sure you reconnected the wire

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Quote:
Originally Posted by WileyNJ View Post
I got the check engine light after a tune up.
Could not reset it via battery disconnect.
Ends up, I NEVER RECONNECTED THE SENSOR WIRE ON THE AIRBOX.
After reconnecting, and then disconnecting the battery and re connecting after 5 mins I was all good.

I felt like a dummy, but I gained a OBD Reader in the process of diagnosis.
My frustration is your gain. So if you moved the air box to do plugs etc, check to make sure you reconnected the wire
Just did the same thing, only this thread saved me!

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  Jeep Commander Forums: Jeep Commander Forum > Jeep Commander Discussion > Regular Service / Maintenance > Diagnostic Trouble Codes (DTC)

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