Diagnostic Aids

The PCM has the ability to diagnose opens and shorts on the knock sensor circuit. The 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

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