Diagnostic Aids

PCM has the ability to diagnose opens and shorts on knock sensor circuit. Scan tester will display if one or both sensors are open, or if both are grounded. Also, ensure knock sensor module is properly installed.

Fig 1: Code 43 Schematic (5.7L) Knock Sensor Circuit (Dual Sensors)

Fig 2: Code 43 Diagnostic Flow Chart (5.7L) Knock Sensor Circuit (Dual Sensors)