OBDII code 0452

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  #1  
Old 01-19-05, 11:58 AM
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OBDII code 0452

1998 GMC sierra 4.3 vortec 267000mi.
for the last three weeks trouble code 0452 has been popping out.
I was told to replace the gas cap and see if that solved the problem.
I relaced it and it didn`t do any good. Does anyone no what couses this
code and how to fix it.
 
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  #2  
Old 01-19-05, 12:30 PM
Master101
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OBD II trouble code P0452

Evaporative Emission Control System Pressure Sensor Low Input
 
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Old 01-19-05, 12:43 PM
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OBDII code 0452

what is it thats cousing code. what should I look foror what shoud i check.
thank you for your quick response.
 
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Old 01-19-05, 02:05 PM
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Check the wires between the pcm and the fuel tank pressure sensor.At the sensor with it disconnected (key on) you should have ground on the black wire and 5 volts on the gray wire.Do you have access to a scan tool?
 
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Old 01-19-05, 02:16 PM
Master101
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P0452 could also mean

Fuel Tank Pressure Sensor Circuit Low Input

depending on the car

Long shot guess fuel pump.
 
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Old 01-19-05, 02:43 PM
Master101
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Another long shot guess fuel pump relay.

Hope this helps!

http://groups.google.ca/groups?hl=en...com%26rnum%3D1
 
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Old 01-19-05, 02:48 PM
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OBDII code 0452

Thanx Master101
I will replace the relay and I`ll get back to you with the results
 
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Old 01-19-05, 02:58 PM
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OBDII code 0452

Thank you for your reply Davo
I will do the diagnostic you sujested and see what I come up with, and yes
I have an actron OBD diag- tool and a craftsman multimeter
 
  #9  
Old 01-20-05, 03:43 PM
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Don't replace the relay or the pump it will not help a thing.Check the gray wire for 5 volts (key on) to a known good ground.Then let us know what you find.
 
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Old 01-20-05, 04:07 PM
Master101
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Tell us some symptoms

Do you hear the fuel pump working (buzzing sound) when turn on the key.

Do you get fuel near the hood. (smell)

Do spark plug test to see if it's working.
 
  #11  
Old 01-20-05, 04:21 PM
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The only symptom of a P0452 is the SERVICE ENGINE SOON light being on.It is a code for an electrical circuit malfunction in the EVAP diagnostic system.The truck will run fine forever with that code.
 
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Old 01-20-05, 04:33 PM
Master101
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Best idea is to get certified mechanic to look at it before GMC break down.

Let us know what the solution was to low input.
 
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Old 01-20-05, 04:47 PM
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some folks don't get it

You have a pm master101 I suggest you read it soon.
 
  #14  
Old 01-23-05, 07:57 AM
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Thumbs up OBDII code 0452

Thank you for your help guys, Davo was right.
I traced the wire and found that in passed somebody had probed 5 wires
of the wire harness near the fuel filter and didn`t seal it back up. Being in Michigan, guess the salt worked its way in and corroded trhe wires.I cut the wires to where they were clean and added a new one. That solved my problem. Thanks again Davo.
 
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