2002 olds alero obd codes

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2002 olds alero obd codes

Unread post by momofkmal » Sun Apr 16, 2017 1:34 pm

obd scan shows codes p0113,p0443 and p0449. where is the iat fuse for a 2002 olds alero located so can check to see if its blown ?


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Re: 2002 olds alero obd codes

Unread post by carriedi » Mon Apr 17, 2017 10:49 am

P0113 is for the manifold air temperature sensor, check to see that someone hasn't left it unplugged after taking the intake tube off.

p0443 is for Evap emission system purge valve/solenoid. The purge valve is a pulse modulated valve controlled by the computer. It turns on and off allowing vacuum to suck in air or gas vapors from the charcoal canister up into the intake. With the correct scan tool you can command the valve to turn on and off (modulate) and see if it is clicking on and off. you could hook up a vacuum pump and gauge to see it the valve is opening and closing. Something to check for when you disconnect the line from the charcoal canister is if there is any grit in the line. If there is the charcoal canister may be bad abd bits of charcoal are coming up the line and holding the valve open.

P0449 is for the evap vent solenoid. This solenoid is similar to the purge solenoid in that it is controlled by the computer and clicks open and close to allow air/fuel vapor to flow. It is just at the other end of the system.

You should look at your fuel tank pressure sensor (FTP). See if the fuel tank pressure sensor is working correctly.

there is no separate fuse for the Intake air temp. it is a two wire sensor and both wires go to the computer

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