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Home >> Nissan-Datsun >> 2001 >> Sentra SE, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.0L >> Diagnostic Tests >> DTC P0325: Knock Sensor >> Diagnostic Procedure

Diagnostic Procedure

  1. Turn ignition off. Loosen and retighten engine ground bolts. See Figure. Disconnect knock sensor and ECM harness connectors. See Figure and Fig 1 . Check continuity of White wire between knock sensor harness connector terminal No. 1 and ECM harness connector terminal No. 81. See Figure. Continuity should exist. Also, check circuit for short to ground and short to voltage. See WIRING DIAGRAMS article. Repair circuit as necessary and retest system. If circuit is okay, go to next step.
  2. Measure resistance between ground and terminal No. 1 at knock sensor (component side). See Fig 2. Resistance should be 500-620 k/ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace knock sensor and retest system.
  3. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
Fig 1: Locating Knock Sensor
G00015024Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Testing Knock Sensor
G00014353Courtesy of NISSAN MOTOR CO., U.S.A.
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