Testing the evap flow sensor (p1443 code)
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Old January 2nd, 2012, 12:47 AM   1 links from elsewhere to this Post. Click to view. #1
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Testing the evap flow sensor (p1443 code)


Hey guys, I pulled up some info when I was working on my car last week and I figured I'd share it with you. The code I had was P1443.

This is your EVAP flow sensor:


Here in the engine compartment, I circled it:

It is connected to the vacuum line from the back of the throttle body/plenum area to the sensor, then down to the charcoal canister.

Here are the pins on it, labeled A,B, and C:



Before you test the sensor, check for vacuum leaks in the system. Unplug the connector and pull the sensor out, then let it cool to room temp.
Pin A:Ground
Pin B: Power (reference voltage I think)
Pin C: Signal
Use a ohmmeter to measure the resistances between the following pins:

A to C: Should read more than 25.5 Ohms.

B to C: Should read between 25.65-28.35 Ohms.

A to B: Should read 130 Ohms or less.

If anyone finds something wrong in here just let me know and I'll fix it.
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Old August 31st, 2012, 05:38 PM   #2
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What were your results of the resistance tests? Was this the problem?
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Last edited by Rich2279; August 31st, 2012 at 11:19 PM.
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Old August 31st, 2012, 07:26 PM   #3
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Yea, I had same code. Replaced the sensor, still have the code...lol
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Old August 31st, 2012, 08:26 PM   #4
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"It is connected to the vacuum line from the back of the throttle body/plenum area to the sensor, then down to the charcoal canister."

From the evap. sensor, the line should go down to the evap. flow valve and then to the charcoal canister.


Just tested my evap sensor with an Ohm meter

Pin A to C= 39.1 ohms
Pin B to C= "open"
Pin A to B= "open"

I also ohm tested the evap. flow valve and got 62.9 Ohms
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Old August 31st, 2012, 10:56 PM   #5
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yeah my 96 has one of those,but my fox lake p-51 intake doesnt have a nipple for it so not real sure what im gonna do about it yet
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Old September 5th, 2012, 09:02 PM   #6
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Just tested my old evap sensor with an Ohm meter

Pin A to C= 39.1 ohms
Pin B to C= "open"
Pin A to B= "open"

I also ohm tested the evap. flow valve and got 62.9 Ohms

Update: Received my new evap sensor from RockAuto Auto Parts
Ohm tested and received the following readings:

Pin A to C= 39.1 ohms
Pin B to C= 94.7 ohms
Pin A to B= 133.3 ohms
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Old September 10th, 2012, 02:20 PM   #7
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Did that solve your CEL? The info I typed up I pulled off AllData, When I tested my old one I think I had B-C was open.
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Old September 10th, 2012, 08:18 PM   #8
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Originally Posted by Vect0rmask View Post
Did that solve your CEL? The info I typed up I pulled off AllData, When I tested my old one I think I had B-C was open.
I replaced the sensor and cleared the code. Just for a good measure, I replaced the vacuum lines going to and from the sensor as well as the line for the vent solenoid. So far the engine light has not come back on. I will post again if it does.
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