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Re: pulled ecu codes, What does it all mean?
Posted by steve parsons (more from steve parsons) on Thu, 3 Oct 2002 22:50:53
In Reply to: pulled ecu codes, What does it all mean?, butch, Thu, 3 Oct 2002 19:21:44
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I believe the mass airflow sensor can certainly "just die", but there's a limp home mode in the computer that supposedly allows you to...limp home! The mass airflow sensor is a heated wire that's kept at a certain temp by electrical current. The computer reads the voltage it takes to maintain this temp as the air passes over the wire and this voltage is comverted to an airflow reading, which then is used to set the fuel flow. If the wire "burns out", the computer doesn't know what the airflow and fuel flow should be.
When you shut the engine off, a voltage is sent for a few seconds to the sensor that turns the wire red hot to burn off any contaminents. A check to see if the sensor is working is to look to see if it turns red hot after shuting the engine off. To do so, remove the inlet elbow going from the air cleaner to the mass airflow sensor. Run the engine at a high idle for a few seconds, drop it back to idle, shut engine off, then hurry out and look into the inlet of the airflow sensor. You should see it glowing red. It glows for a few seconds (3 or 4, I think). It's enough time for you to do it yourself, but having a helper helps. Rebuilt units are availiable for around $130-150 from some Saabnet advertisers.
posted by 64.12.96...
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