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Knock Sensor Circuit (Models Using External Spark Controller Module)

  1. An open or short circuit on IC module control wire to PCM will cause a loss of 12-volt IC module signal. This will cause PCM to fully retard ignition timing.
  2. Install scan tool. Using a metal object, 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, backprobe PCM knock sensor signal terminal with a DVOM. With engine idling, 8-12 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 then return to original voltage when knock signal ceases.
  4. If voltage signal does not respond as described, check knock sensor-to-module signal. On vehicles equipped with automatic transmission, it may be necessary to place transmission in Drive for timing change to occur.
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