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Old 11-18-2013, 09:21 PM   #1
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Electrical issues

For a while now I have been having a problem with my manifold air intake sensor.

I have replaced the sensor, traced the vacuum lines, and checked all the wires and everything is fine.

Finally I measured the voltage of the sensor and noticed that the resistance is way too high.

I believe the high resistance is throwing my check engine light on (Code 23). The Jeep runs great.

My question is how do I fix this?

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Old 11-18-2013, 09:45 PM   #2
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From your profile I get MPFI. How did you determine the resistance is too high???

Did you get the info from a manual or a resistance chart???

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Old 11-18-2013, 09:52 PM   #3
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Resistance Charts

Take a look and see if this helps. You may have to remove and cool in the fridge and then check as it warms up.
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Old 11-19-2013, 10:40 AM   #4
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Originally Posted by jokerchief462 View Post
Take a look and see if this helps. You may have to remove and cool in the fridge and then check as it warms up.
Looking at that chart I'm thinking the coolant temp sensor could throw the code 23 since it says coolant/manifold air temp, but I really don't know.

I don't have a volt meter, so I ended up taking it to a dealer (first time EVER I took a car in for someone else to find the problem). The mechanic told me the resistance is way too high, but didn't tell me what the volts were.

I guess I'll try to replace the coolant temp sensor (it has gone bad before).

Thanks for the help!
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Old 11-19-2013, 03:50 PM   #5
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I know it sounds frivelous, but pull off your battery cables and check under the connectors to be sure the lead is not coroded and split. Then clean the connections really good and reseat. Don't know if you've done it or not, and I'm not 100% sure how relevant it is.

But, the reason I say this is because of my experience with the 4.0's in the ZJ's. They are so picky about good battery connections they'll throw the same codes. The resistance may not be at the sensor, it may be loosing some connectivity at the battery. High resistance means low power throughput. Start by making 100% sure you have good battery cables and good connections at the battery and the back of the alternator.
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Old 11-20-2013, 11:15 AM   #6
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I know it sounds frivelous, but pull off your battery cables and check under the connectors to be sure the lead is not coroded and split. Then clean the connections really good and reseat. Don't know if you've done it or not, and I'm not 100% sure how relevant it is.

But, the reason I say this is because of my experience with the 4.0's in the ZJ's. They are so picky about good battery connections they'll throw the same codes. The resistance may not be at the sensor, it may be loosing some connectivity at the battery. High resistance means low power throughput. Start by making 100% sure you have good battery cables and good connections at the battery and the back of the alternator.
That is a good idea. I have the 2.5 and it is also really picky about the connectors. A while back it wouldn't start because they were a little loose, so i tightened them up like a quarter turn with a wrench and it started right up. I was surprised how picky those wires were!

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