LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 1991 >> Legend Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Code 53: Right Knock Sensor
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code 53: Right Knock Sensor

NOTE: For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. For vacuum diagrams, see VACUUM DIAGRAMS article in the ENGINE PERFORMANCE Section.
NOTE: Repair any engine knocking sounds before performing this test.
  1. Turn ignition off. Remove ACG fuse in underdash fuse box for 10 seconds to reset ECU. Warm engine until cooling fan comes on. With transmission in Neutral, hold engine speed 3000-4000 RPM for 10 seconds.
  2. Check if CHECK ENGINE light flashes Code 53. If light does not flash Code 53, problem is intermittent. Check for poor connections and loose wires at knock sensor connector, ECU and terminals in connector C353 at right shock tower.
  3. If CHECK ENGINE light flashes Code 53, turn ignition off. Connect ECU test harness to harness connector only (not ECU). See Figure . Disconnect knock sensor connector.
  4. Check for continuity between D3 and ground. If no continuity exists, go to next step. If continuity is present, repair short in White wire between D3 terminal at ECU and knock sensor.
  5. Check for continuity between ECU terminal D3 and White wire at knock sensor connector. If continuity is present, go to next step. If no continuity exists, repair open in White wire between D3 terminal at ECU and knock sensor.
  6. If continuity is present, replace knock sensor with a known good one. Retest vehicle for code. If condition goes away, replace knock sensor. If condition is still present, replace ECU.
scientia non olet · About LEMON Manuals