Question about 2003 Pontiac Grand Am
A drive cycle is basically the computers way off checking all of the systems to make sure that they are operating noramally, it checks to make sure under certian conditions that everything is reading and working the way it is supposed to.... for example as you are at a steady speed it makes sure that the oxygen ssensors are switching between rich and lean and not stuck to one value or the other. Also it checks to make sure that your emissons systems are purging and venting the fuel vapors like they are supposed to and not loising them to the atmosphere/ like the gas cap being left off...
These are the steps that would have to be followed to complete the drive cycle alot of times they need to be done more than once before they will all completely pass.
A complete driving cycle should perform diagnostics on all systems. A complete driving cycle can be done in under fifteen minutes.
To perform an OBDII Driving cycle do the following:
Posted on May 24, 2011
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Posted on Jan 02, 2017
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