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Home >> Saturn >> 1997 >> SC2 Automatic, MP7 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Ignition System >> Timing Control Systems >> Knock Sensor (KS) System Without KS Module
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Knock Sensor (KS) System Without KS Module

  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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