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Home › Saab › 1996 › 9000 CS, Automatic › Repair and Diagnosis › External Pages › Different car › Section 15 (Engine Controls - System/Component Tests - 3.0L V6) › Ignition System › Timing Control Systems › Knock Sensor (KS)

Knock Sensor (KS)

WARNING: This page is about a different car, the 1995 Saab 9000. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect timing light. With engine running at a fast idle, tap cylinder head with a plastic mallet. If timing retards, knock sensor is okay. If timing does not retard, turn ignition switch off and go to next step.
  2. Locate knock sensor under intake manifold. Unplug connectors from sensor and ignition ECM. Inspect wiring between knock sensor and ECM connector. See the WIRING DIAGRAMS - 3.0L V6 article. If open or short circuit is located, repair as necessary. Reconnect knock sensor and ECM, and retest system. If wiring is good, go to next step.
  3. Temporarily replace knock sensor with known good unit. Repeat step 1). If timing still does not retard, reinstall original sensor and replace ECM.
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