LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saturn >> 1997 >> SC1 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Ignition System >> Timing Control Systems >> Knock Sensor (KS) System With KS Module
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Knock Sensor (KS) System With KS Module

  1. An open or short circuit on KS wire to PCM will cause a loss of 12-volt KS module signal. This will cause PCM to fully retard ignition timing.
  2. If 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 scan tool is not available, connect a DVOM to PCM KS signal terminal. With engine idling, 12 volts should be present at this terminal. Using a metal object, tap on engine close to knock sensor. Voltage signal at PCM terminal should drop to zero volts, and return when knock signal ceases.
  4. If signal does not respond as described, check knock sensor signal to KS module. 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 .
scientia non olet · About LEMON Manuals