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

Knock Sensor (KS) Circuit

  1. Knock sensor is mounted in engine block near cylinders. KS produces an AC output voltage which increases with severity of knock. KS sends a signal voltage to PCM. PCM will retard EST based on signal from KS to PCM. An open or short circuit on ESC wire to PCM will cause a loss of 12-volt ESC controller signal. This will cause PCM to fully retard ignition timing.
  2. Disconnect connector at KS. Connect DVOM to ground, measure resistance at KS. Resistance should be 90,000-110,000 ohms. If resistance is not within specifications, If repair was not needed, replace KS. If resistance is within specifications, check KS circuit. See appropriate KNOCK SENSOR CIRCUIT DTC under SELF-DIAGNOSTICS.
scientia non olet · About LEMON Manuals