Question about 1997 Subaru Legacy

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Code p1143 I need to know what that code means

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Found the answer at:
http://www.ultimatesubaru.org/forum/showthread.php?t=98709


Pressure Sensor Circuit Low Input

Posted on Oct 29, 2012

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What does the code p1143


Hello there!

P1143 Pressure Sensor Circuit Low Input Possible Causes

* Pressure sensor vacuum line damaged, loose or disconnected * Pressure sensor signal circuit is open or shorted to ground * Pressure sensor reference (5v) circuit is open or shorted to ground * Pressure sensor has failed

Tests/Procedures:

Check for a 5 volt reference on the reference wire Check the voltage on the signal signal wire. 4.0-4.2V KOEO (key on engine off), 2.0-2.3V with manifold vacuum applied. And be sure it has a good ground key on engine off and running.

Source: Subaru master mechanic (Brian)

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We are assumin gthat you are talking about DTC P1443 - Evaporative Emission Control System - Vacuum System - Purge Control Solenoid or Purge Control Valve fault.

Best guess without pinpoint testing would be the purge flow sensor. This is the most common failure for this code but can be caused by anything that would limit flow across the sensor when flow is commanded by the PCM restricted cannister,stuck or plugged cannister vent solenoid,etc....

On the base model it is located in the purge line between the carbon cannister and the purge solenoid. See pic below for base model diagram(click HERE for zoom)...


10_12_2011_1_33_42_pm.gif


Click HERE for zoom...

10_12_2011_1_34_31_pm.gif

If yopu need additional details, just Contact Us Here.

Hope thie helps.

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