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Home >> Nissan-Datsun >> 1993 >> Sentra SE-R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.0L >> Diagnostic Trouble Code (DTC) Tests >> DTC 34: Knock Sensor
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DTC 34: Knock Sensor

NOTE: The knock sensor has a sub-harness assembly. This test is performed at the wiring harness-to-sub-harness connector.
  1. Check Input Signal Circuit  - Turn ignition off. Disconnect ECM. See Figure . Disconnect knock sensor. See Fig 1 . Check continuity between wiring harness connector terminal "b" (White wire) and ECM terminal No. 27 (White wire). See Figure and Fig 2 . If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
  2. Check Component  - Inspect knock sensor. See I - SYS/COMP TESTS article. Replace knock sensor if necessary and perform FINAL CHECK  in this article. If knock sensor is okay, repair ECM pin terminals and/or wiring harness connector.
Fig 1: Locating Knock Sensor Harness Connector
G93H80942Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: DTC 34, Checking Input Signal Circuit
G93I80943Courtesy of NISSAN MOTOR CO., U.S.A.
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