2003 olds alero will not communicate with a scan tool

Question edited for clarity and typos.
Question moved to model category.

It is a known issue. Fuel pumps can work, but not provide enough pressure, so you need to test with a pressure gauge. There is also a Pressure Regulator. Have a read of this.

https://www.justanswer.com/oldsmobile/6cz1n-oldsmobile-alero-olds-alero-starts-dies.html

Lots more here

https://www.google.com/search?q=2003+Oldsmobile+Alero+starts+and+then+dies

You may need an auto electrician with a pro grade scan tool computer.

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The same thing happened to my 03 olds Alero, i pluged my scan tool in and found out that my fuel pump was bad, I changed the fuel pump, fuel filter, and also checked the fuel injectors and blew out the fuel lines, now it's running great.

The pump gets power from the pump relay, for 3-5 seconds during cranking, and then once the engine computer sees oil pressure or RPM. The engine computer grounds the relay.

fuel pump relay or fuse to the relay

check fuel pressure.sound like fuel pump not working.fuel pressure should be 41 - 47 psi. if not replace fuel filter, still too low pump faulty, if you not getting fuel pressure, pump still not working check fuel pump fuse and relay.code scan car first look for fault in pcm.it controls the fuel pump relay and fuel pump.

May want to check the fuel pump relay.

Try replacing the air filter.

find the buzzing noise...likely its the fuel pump relay.

Hi. here are a few steps that will help you troubleshoot this device.

Step1 Go to the back of your carand take off the fuel filler cap. Ask an assistant to turn the ignitionon but do not start the engine. Listen closely for a brief, vibratorysound coming from the tank. If you cannot hear the sound, go to thenext step. Step2Check the fuel pump circuit fuse. It should be in the fuse panel underthe dashboard or in the engine compartment Verify that it is in goodcondition and the contacts are free from corrosion. If necessary,replace it and test the pump again. Step3Inspect fuel lines, hoses and connectors. Make sure hoses are not torn,bent or obstructed. Verify there are no gas leaks. Step4Locate the fuel pump relay. You might find it in the enginecompartment, at the driver or passenger side and close to thewindshield or at the front of the engine as part of a cluster ofrelays. Another common place is under the dashboard. Step5Remove the fuel pump relay. Ask an assistant to turn the ignition onbut do not start the engine. Using a test light, check for incomingvoltage at the relay connector. If there is no voltage, check for anopen or short at the wire between the relay and the fuse panel. Step6Jump the relay connector to apply battery voltage to the fuel pump.After the jumper wire is connected, ask an assistant to turn on theignition while you listen for fuel pump operation as described in step1. If the fuel pump works now, replace the relay and test again.Another alternative is to test the fuel pump relay for properoperation. Step7Locate the fuel pump connector at the back of the car and check forincoming voltage with a test light. While you check for voltage, ask anassistant to turn on the ignition but do not start the engine. If thereis no voltage, check for an open or short at the wire between the relayand the fuel pump. Step8 Check the power and ground connections at the pump and make sure they are good and free of corrosion. Step9Test the fuel pump. Apply direct voltage to the fuel pump. If youcannot easily remove the fuel pump through the trunk of your vehicle,you might want to take a fully charge car battery to the back of thecar. Raise the vehicle and secure it firmly on jack stands. Unplug thefuel connector and use a couple of jumper wires to connect the batteryto the fuel pump. If the pump does not work, replace it.

Please rate and god bless:)

This is a bad PCM. Try to disconnect the security system first and if it still does not start then it is the PCM.