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Home >> Nissan-Datsun >> 1994 >> 300ZX Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Code (DTC) Tests >> DTC 34: Knock Sensor

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 harness connector and knock sensor sub-harness connector. See Figure and Fig 1 . Check continuity between wiring harness connector terminal "b" (White wire) and ECM terminal No. 23 (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 Ground Circuit

    Turn ignition off. Check continuity between knock sensor connector terminal "a" and engine ground. See Fig 3 . If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.

  3. Check Component

    Inspect knock sensor. See SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section. 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
G94J44544Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: DTC 34, Checking Input Signal Circuit
G93G80784Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: DTC 34, Checking Ground Circuit
G93H80785Courtesy of NISSAN MOTOR CO., U.S.A.
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