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DaksRight
Dodge Dakota
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6/02/2005
20:24:06

Subject: IAT schematics
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Any one happen to have them? I searched around and found nothing but links to dead speadtweak site



Because...
Dodge Dakota
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6/03/2005
01:04:56

RE: IAT schematics
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No schematic is necessary.

From the book:
"
DESCRIPTION
The 2–wire Intake Manifold Air Temperature (IAT) sensor is installed in the intake manifold with the sensor element extending into the air stream. The IAT sensor is a two-wire Negative Thermal Coefficient (NTC) sensor. Meaning, as intake manifold temperature increases, resistance (voltage) in the sensor decreases. As temperature decreases, resistance (voltage) in the sensor increases.

OPERATION
The IAT sensor provides an input voltage to the Powertrain Control Module (PCM) indicating the density of the air entering the intake manifold based upon intake manifold temperature. At key-on, a 5–volt power circuit is supplied to the sensor from the PCM. The sensor is grounded at the PCM through a low-noise, sensor-return circuit. The PCM uses this input to calculate the following:
Injector pulse-width.
Adjustment of spark timing (to help prevent spark knock with high intake manifold air-charge temperatures).
The resistance values of the IAT sensor is the same as for the Engine Coolant Temperature (ECT) sensor.
"

See. It don't get much simpler than that.



Rob C
Dodge Dakota
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6/03/2005
10:46:07

RE: IAT schematics
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I know it's simple to most of us but, I think he was looking for the schematics to the DITY IAT adjuster that we use to hear about.
I would think that a resourceful guy could meter the IAT sensor resistance when cold, then again when hot to determine the range of resistance, then buy a suitable rheostat to put inline with the IAT. That way you could adjust the resistance to the desired level to get the mixture and spark timing that worked best for you. You'd probably want a low resistance rheostat, maybe 0-1000 ohm max? Anyone know the resistance ranges for the IAT?



Mason
Dodge Dakota
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6/03/2005
18:02:32

RE: IAT schematics
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Add no more than a 10K resistor in series with IAT sensor.
-or-
If you want adjustable, add 10k potentiometer in series, connect to center terminal and one end terminal of the pot, and you can dial in the temp difference you want (0* to -10*).
10K makes the computer think the intake air is
10* cooler. More than that and you risk a Check Engine Light.




Mason
Dodge Dakota
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6/03/2005
18:09:56

RE: IAT schematics
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Boy, did I really screw up.
The resistor value should be in the range of 2.2K to 2.5k for a 10* change, NOT 10K.

Sorry. Got confused with another project.




Dewey
Dodge Dakota
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6/03/2005
19:20:10

RE: IAT schematics
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I need to know what cams are in my stock 4.7L does anyone know?



Duh
Dodge Dakota
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6/03/2005
22:27:30

RE: IAT schematics
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Drum roll please...Uh...stock cams!
How'd I do?



Duh
Dodge Dakota
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6/03/2005
22:38:58

RE: IAT schematics
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I need to know what year engine is in Deweys dakota so I can tell him which one of the three possible sets of cams he has does anybody know?





daksright
Dodge Dakota
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6/03/2005
23:03:58

RE: IAT schematics
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yeah def looking for the schematics, used to have it but comp crashed.

any one?



Wayne
Dodge Dakota
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6/15/2005
18:38:35

RE: IAT - rough idle
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After reading some info. from this very useful site, I have a question to ask about this IAT sensor, and the PCM module / reprogramming.

I have a 2000 Dakota 4.7 L V8, which until about 50,000 miles ran great. Since that time, up to the current 68,000 miles, I have noticed the engine idle getting rougher, and the motor wanting to start at a much higher idle when I first turn the key. It quickly comes down to a normal idle, but just roars to life when you turn the key.

The motor always had a "rough roar" to it when first starting out, especially on a cold morning, but would usually smooth out after a minute of idling down my block. Now it fells like this roughness never goes away, and the idle tends to jump around a little when stopped at a light, etc...I also really feel like it has lost some of the low end torque when starting out compared to what it used to feel like.

Apparently I did get the PCM software upgrade as there is a sticker under the hood stating "PCM reprogrammed", which has been there since I bought it new in the winter of 2000 / 01.

Could the PCM lose the updated program somehow and revert back to an earlier revision, stored in some non-volital memory?

I had two dealships review this issue. The first changed the spark plugs, and worked on the throttle body, with no improvements. The second, plugged it into the diagnostic computer and said nothing was wrong.

I ask about the IAT sensor, because as the weather has gotton hotter (near 90 degrees ambient) and it seemed to be running a little smoother. Today it is back in the low 70's and the rough idle is back.

Any thoughts? Suggestions?

Thanks! Wayne from Chicagoland



Don
Dodge Dakota
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6/19/2005
19:25:21

RE: IAT schematics
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according to my haynes repair manual at 32* you should have between 29,330-35,990 ohms,50* 17,990-21,810 ohms,68* 11,370-13,610 ohms,77* 9,120-10,880 ohms,86* 7,370-8,750 ohms,104* 4,900-5,750 ohms.These are some of the temps listed prob the most useful hope it helps.



Ray
Dodge Dakota
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1/19/2011
01:30:41

RE: 2000 Dakota 5.9 liter
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My wife took her Dakota quad cab 4x4 5.9 liter truck to the local shop due to the engine light coming on. Shop plugged it in to their computer and got a P0305 cylinder #5 misfire code.

The receipt read as follows

"Found stored codes P0305 cylinder #5 misfire. Inspect ignition system found coolant on spark plug. Cooling system over 1 gallon low when vehicle was seen. During pressure test of cooling system there was a loss of pressure over 15 minutes above 2 bar. Checked for hydrocarbons in cooling system. 78 grams in volume. When cranking engine resistance in lower engine. Engine damage internal recommend further diagnostic."

Do you all think this is a head gasket problem? We replaced the water pump and thermostat about three or four months ago and the motor was running hot when the pump went out.

Any help? I expect we will bring it to the Dodge dealership when we can afford the repair.



gasman
Dodge Dakota
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8/07/2011
18:01:08

RE: IAT schematics
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wire colors location of iat thank you



1969roadrunne
Dodge Dakota
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11/15/2013
17:45:50

RE: IAT schematics
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need a picture of wiring diagram of iat/maf sensor on my 2001 quad cab dakota p/u with 4.7L v-8. am going to install a maf g-force chip hoping to improve gas mileage/performance. Need to find the two wires needed to connect the g-force module.



daddio
Dodge Dakota
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11/15/2013
22:03:25

RE: IAT schematics
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The IAT and MAF are two totally different sensors.
I would not bother installing a "Chip" which is
probably nothing more than a resistor to change the
voltage that the PCM sees from the IAT. It will
most likely cost you mileage.

You're better off spending a little more and get a
programmer.



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