One part of the datastream that was removed to make room for the new info was the malfunction code readout, however the codes can still be read by using the "blinking SES" method. This is good, since we are less likely to miss a low O2 reading or a high knock retard reading in between updates. As such, the datastream can be modified with other information, as long as the scantool is able to interpret the new data.īob Bailey, the creator of the Scanmaster, has written new datastreams that are compatible with the Scanmaster that add some data (such as injector pulsewidth and spark timing), but more importantly, they increase the rate at which the O2 readings and knock retard are refreshed. The info in the ALDL datastream is dictated by the chip. It displays the information that the ECM transmits through the ALDL plug under the radio. The Scanmaster is a great scantool device made for our cars that helps anyone tune and troubleshoot their cars without requiring a laptop. I get quite a few questions on this, so a little info on what the "fast update" code patch is, for those that don't know.
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