Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Knock Sensor (KS) System Without KS Controller (C-5)
1992 Saturn SC StandardSECTION Knock Sensor (KS) System Without KS Controller (C-5)
WARNING: This page is about a different car, the 1995 Cadillac Seville and 1995 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
- An open or short circuit on the KS wire to the PCM will set a related diagnostic trouble code. A false detonation signal will not cause PCM to set a code.
- If a scan tester is available, connect it to the DLC. Tap on engine next to knock sensor and note "knock" parameter. Knock should be indicated on scan tester.
- If a scan tester 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 RPM decrease occurred, check knock sensor-to-PCM circuit.
- On vehicles equipped 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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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.