CODE P1143 & P0106 REPAIRS - 1999 Subaru Forester

Definition of Diagnostic Trouble Code P0106 Category: Powertrain Definition: Manifold Absolute Pressure/Barometric Pressure Circuit Range/PerformanceNote: This definition of P0106 is applied to all manufacturers
Definition of Diagnostic Trouble Code P0121 Category: Powertrain Definition: Throttle/Pedal Position Sensor/Switch "A" Circuit Range/PerformanceNote: This definition of P0121 is applied to all manufacturers

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)

The P1143 means Air Assist Control Valve Range/Performance.
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car keys replacement

The P0106 DTC trouble code refers to the Manifold Absolute Pressure sensor or "MAP sensor"

p0106 is a map sensor code and p0170 is a lean code i would look for a vacuum leak that would cause both codes

Code P0010 Intake camshaft position actuator solenoid control circuit ( CMP )

most common cause is a bad solenoid, but it could be many componets that could cause the code, if you want to try to repair it on your own the only thing you can do is replace the solenoid, all other componets require some speclized test equipment.

code P0106 manafold absolute pressure sensor ( MAP )

check for a good vacuum source to the MAP sensor if there is a good vaccum source then replace the sensor.

good luck

02 jetta map sensor code p0106 and faulty boost sensor code p0238

P1143 Air assist control valve range/performance

Could Be your mass air flow sensor. Start there.

Check connections etc at MAP sensor. If all good, replace it. Erase codes & retry. How's vehicle running, idling, any black smoke out tailpipe?

Cannovices,
You may want to take a look at these threads...

http://forums.nasioc.com/forums/showthread.php?t=907787&highlight=p1143+code

http://forums.nasioc.com/forums/showthread.php?t=89878&highlight=p1143+code

http://forums.nasioc.com/forums/showthread.php?t=90071&highlight=p1143+code