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Unread 08-09-2011, 10:01 PM   #1
zte87
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map sensor

So I have a code 14 map sensor voltage to high or to low! along with the engine light I have a really low idol when when first started and it seems to be better when I disconnect the map sensor vacuum line from the throttle body! one more thing once it is warmed up it runs alot better but still has the engine light! any ideas guys?

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Unread 08-10-2011, 12:37 AM   #2
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no body has any ideas?
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Unread 08-11-2011, 08:48 PM   #3
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if know one here knows where or who should I ask?
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Unread 08-11-2011, 08:52 PM   #4
nathanninja
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I have that light too, and I didn't know it had anything to do with the voltage, my Haynes manual just said "MAP Sensor". I figured out why mine is on though, I'm missing a vacuum line from the manifold to the sensor. I also have a bit of a rough idle, nothing too bad though. I'd check that line and then go from there. Maybe replace the sensor, I priced it I think it was under $50. Here's where the MAP sensor is, and the line goes from it to the manifold.

Tiny picture that I found online, its the rusty triangular thing with the green plug in the middle of your firewall at the top, right under the hood.
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Unread 08-11-2011, 11:02 PM   #5
zte87
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yeah I have replaced it twice now and still the light remains even after restarting the ecm!
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Unread 08-12-2011, 09:07 AM   #6
oldtime_ironman
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It says the voltage is too high or low, so I would start looking at the wiring to and from the MAP, since you already replaced it. Could be as simple as a bum connector.
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Unread 08-12-2011, 09:10 AM   #7
Berniebikes
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check both the vacum line connection and the wiring connections to find your fault.
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Unread 08-12-2011, 09:20 AM   #8
zte87
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My vacuum lines seem to be ok what goes bad in the connector?
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Unread 08-12-2011, 09:31 AM   #9
oldtime_ironman
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Quote:
Originally Posted by zte87 View Post
My vacuum lines seem to be ok what goes bad in the connector?
Could be corroded or loose. Could be any of the usual electrical probs. I do know that its supposed to get 5 volts on one wire, but not sure about the others... one of them is probably a ground. I gotta go look it up. Haynes manual FTW. But at any rate I'd start checking your wiring to and from the sensor and just look for anything obvious.
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Unread 08-13-2011, 11:29 PM   #10
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Yeah I am going to try and trace the wire all the way back goths ECM! Do only does it run ruff but it is running really rich! Some times when I go to give it gas it bogs down and back fires threw the intake a little does this make sence?
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Unread 08-14-2011, 10:08 AM   #11
MDonovan8
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Tracing the wires is a good start, but what you will find is that the MAP it tied into other sensors. The TPS, IAC, MAP, MAT, O2 and Crank Position are all linked together by as black and light blue wire, running to the ECM into position 4. Go to this link http://www.jeep4x4center.com/knowledge-base/index.htm and use the online repair. There you will find a wiring diagram that is the best I have seen. If one of those sensors is off it could throw a code.
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Unread 08-22-2011, 09:08 AM   #12
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so I still have't found the problem! It seems to be running really rich and you get on the gas it bogs and and backfire threw the throttle body does this make any seance?
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Unread 08-22-2011, 10:29 AM   #13
Que89YJ
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Code 14 map is a strait voltage reading from the vacuum input on the motor. If the vacuum line is good from the engine and you've replaced the sensor then you have a vcuum leak. Get a can of carb cleaner and spray around the manifold. Also; the 5Vdc supply and the ground are common to several other sensors; if they aren't throwing codes then both are likely good. That means if it's a wiring issue it would only be an issue with the map input to the ecu which is pin 1. You can check the voltages using this post:
http://www.jeepforum.com/forum/f12/h...ensor-1152970/
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Unread 08-23-2011, 12:42 AM   #14
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Quote:
Originally Posted by Que89YJ
Code 14 map is a strait voltage reading from the vacuum input on the motor. If the vacuum line is good from the engine and you've replaced the sensor then you have a vcuum leak. Get a can of carb cleaner and spray around the manifold. Also; the 5Vdc supply and the ground are common to several other sensors; if they aren't throwing codes then both are likely good. That means if it's a wiring issue it would only be an issue with the map input to the ecu which is pin 1. You can check the voltages using this post:
http://www.jeepforum.com/forum/f12/h...ensor-1152970/
What do u mean by vacuum input on the motor? I can't any vacuum leaks but when I pull a line loose it start idling better!
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Unread 08-23-2011, 07:39 AM   #15
Que89YJ
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I mean the vacuum from the engine. Disconnecting a sensor doesn't tell you anything. The response of the computer in effect will be a default calibration when it seeing a 0 input from a sensor. When you are disconnecting the map do you also disconnect the battery. Every time you disconnect any sensor it will log a fault code that is only cleared with a diagnostic tool or a battery reset. Did you try testing the resistance from the sensor to the ecu? Did the link on troubleshooting the sensor help? Did you use the carb cleaner to check for a vacuum leak?
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