Diagnostic Aids (Knock Sensor Without Spark Module (Single Sensor))

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 1995 GMC Vandura Special, 1995 GMC Vandura, 1995 GMC Suburban, 1995 GMC Rally Camper Special, and 1995 GMC Rally. However, it is still accessible from the selected car via links, so may be relevant.

Control module applies and monitors a 5-volt DC signal to knock sensor. Internal knock sensor circuitry pulls this DC signal down to about 2.5 volts. When knock sensor detects detonation, it generates an AC signal which rides back on DC signal to control module. Knock signal intensity is dependent upon knock signal level.

Fig 1: Code 43 Schematic (All Models) Knock Sensor Without Spark Module (Single Sensor)

Fig 2: Code 43 Flow Chart (All Models) Knock Sensor Without Spark Module (Single Sensor)