Code 43 ESC failure
#1
10-22-2009, 04:08 PM
Join Date: Jun 2006
Location: Rochester Hills Michigan
Posts: 162
Code 43 ESC failure
just got my 94 lt1 running aagain. But every now and then i get a code 43 pop up. and after driving around for a few mins the ses light will turn off. any ideas??? bad o2?
#2
10-22-2009, 04:59 PM
DTC 43 has nothing to do with the O2. It is due to a bad knock sensor circuit. Could be the KS itself is bad, the KS loose or not gronded properly to the block (Do not use any tape on threads), wire from KS to PCM open or shorted to ground, bad KS module in PCM.
With key ON and wire disconnected from KS you shold see 5 Volt to ground and end of wire. From sensor to ground (wire disconnected) you shold measure 3300 to 4500 OHM.
With key ON and wire disconnected from KS you shold see 5 Volt to ground and end of wire. From sensor to ground (wire disconnected) you shold measure 3300 to 4500 OHM.
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