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Old 07-08-2006, 08:27 PM   #1
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sensors in engine bay

someone once told me that there are sensors in the engone bay of my 2003 tj does this mean thatt even if there is no water inmy intake that it can still stall out

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Old 07-08-2006, 08:51 PM   #2
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Your engine bay has lots of control sensors.

for your 2003 they are:
Throttle Position Sensor
Manifold Absolute Pressure sensor
Intake Air Temperature Sensor
Two upstream O2 sensors
Coolant Temperature Sensor
Crank Position Sensor
Cam Position Sensor (driver for your coil on rail ignition)
Oil Pressure Sensor
Battery Temperature Sensor
On CA emissions models you have the Lead Detection Pump as well, which acts as a sensor to test the evap system for leaks.

and I'm probably forgetting a few (that's JUST localized to your engine bay - your Jeep actually has quiet a few more)

These sensors COULD potentially cause your engine to stall if they're faulty - though usually they just make your engine run too rich, too lean, or just plain crappy. However failures of the Cam and Crank sensors would cause a total loss of engine control.

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Old 07-08-2006, 11:04 PM   #3
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but im talking about if i go trough a puddle would water cause any of them to make my car stall like could any of them sence water even if water doesnt enter the intake
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Old 07-09-2006, 12:15 AM   #4
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There's no water sensors to protect your engine - so no; Most of the sensors are also on weatherpack connectors which are more or less water proof, and because of their low voltage, moisture doesn't affect them THAT much. What will stall or screw with your car in a water crossing is if you get water on ignition components - but with a coil on rail ignition like what you have on your year Jeep it's far less sensitive compared to the standard distributor ignition.
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Old 07-09-2006, 11:59 AM   #5
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alrighht thanmks alot for the info
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Old 08-20-2007, 06:54 PM   #6
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Im getting code 12 and 23 poping up on the check engine light.

Code 12- Direct battery input due to PCM was disconnected within the last 50 key-on-cycles

Code 23- Intake air tempature sensor input is above or below acceptible voltage.

I dont exactly know what its saying. So is it the battery thats causeing this or just the IAT sensor that needs to be replaced? I honestly have no clue where to start to fix this issue and any help or ideas of whats causing this would be awesome. Thanks.

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