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Knock Sensor (KS) System Without KS Module

WARNING: This page is about a different car, the 1997 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. An open or short circuit on KS wire to PCM will set a related diagnostic trouble code. A false detonation signal will not cause PCM to set a code.
  2. If a scan tool is available, connect it to the DLC. Tap on engine next to knock sensor and note KNOCK parameter. Knock should be indicated on scan tool.
  3. If a scan tool is not available, connect tachometer to engine. Start engine and hold RPM above idle. Using a metal object, tap on engine close to knock sensor. A noticeable decrease in engine RPM should occur. If no NOTICEABLE RPM decrease occurred, check knock sensor-to-PCM circuit.
  4. On vehicles with automatic transmission, it may be necessary to place transmission in Drive for timing change to occur. Also, see KNOCK SENSOR (KS) under ENGINE SENSORS & SWITCHES .
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