#4251, "RE: fooling the ecu to avoid CEL with MS" In response to In response to 4 Jun-12-08 02:48 AM by VelocitaPaola
Originally posted by ez Question for Paul - Are you suggesting keeping the ECU in open loop forever? Pursuing this route concerns me a little, because isn't this in itself grounds to flunk sm*g? (Or is the ECU not checked for being in closed loop during the diagnostic dyno run?)
No, it was purely hypothetical. I only mentioned open loop mode because the ECU supposedly disregards O2 sensor feedback at that point. Injector pulsewidths are solely determined from internal data and thus the ECU shouldn't have anything to which to compare injector efficacy (except for possibly reverse EMF from an inductive load which would be absent with a resistive load, though I somewhat doubt the ECU's capability of sensing this). I believe you're right in that the ECU must be in closed loop mode for any sort of diagnostics information to be obtained.
Originally posted by ez We should be specific in this thread about separating the OBD-1 ECU from all the other years that had OBD-2.
