Quote:
Originally Posted by gbmidyear66
I'm confused... I had understood (incorrectly?) that the LT5 does a self test of the knock sensor / circuitry at start up. If the seonsor is inoperative - presumably it will indicate a DTC?
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This is almost true but not quite. Yes the ECM will do a test of the ESC module once after start but these two conditions must also be present:
1. Eng temp above 194deg F.
2. at or near WOT (high load)
So, based on this circuit description it is entirely possible to not get a code 43 when the sensor is unplugged.