Knock Sensor (KS) System Without KS Controller (C-5)
WARNING: This page is about a different car, the 1994 Cadillac Eldorado. 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 ECM will set a related diagnostic trouble code. A false detonation signal will not cause ECM 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-ECM 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 .