October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Diagnostic Aids

Code 43 can be caused by a faulty knock sensor connection at ESC module or ECM. Also, check controller-to-ECM signal line for an open or short to ground.

Fig 1: Code 43 Schematic ("C" & "K" Series) Knock Sensor W/ Spark Control Module

Fig 2: Code 43 Schematic ("P" Series) Knock Sensor W/ Spark Control Module

Fig 3: Code 43 Flow Chart (7.4L) Knock Sensor W/ Spark Control Module