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DTC P0325: Knock Sensor Circuit Malfunction

  1. Perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine and run at 3000 RPM, with no load (in park or neutral) until radiator fan comes on. Allow engine to idle. Hold engine speed at 3000-4000 RPM for at least 60 seconds. If DTC P0325 resets, go to next step. If DTC P0325 does not reset, problem is intermittent. System is okay at this time. Check for poor connection(s) or loose wire(s) between PCM 31-pin harness connector, C103 (C161 on MDX) harness connector and Knock Sensor (KS) harness connector. See WIRING DIAGRAMS article. Repair as necessary.
  2. Turn ignition switch off. Disconnect KS sub-harness connector C103 (C161 on MDX). Check for continuity between ground and PCM 31-pin harness connector terminal No. 22 (Red/Blue wire). See Figure . If continuity is not present, go to next step. If continuity is present, repair short in Red/Blue wire between PCM 31-pin harness connector terminal No. 22 and KS sub-harness connector C103 (C161 on MDX).
  3. Connect fused jumper wire between ground and KS sub-harness connector C103 (C161 on MDX). Check for continuity in Red/Blue wire between ground and PCM 31-pin harness connector terminal No. 22. If continuity is present, go to next step. If continuity is not present, repair open in Red/Blue wire between PCM 31-pin harness connector terminal No. 22 and KS sub-harness connector C103 (C161 on MDX).
  4. Check KS sub-harness between KS harness connector and KS sub-harness connector C103 (C161 on MDX) for open or short. If okay, substitute known-good KS and recheck. If DTC P0325 resets, substitute known-good PCM and recheck. If symptom or DTC goes away, replace original PCM. If DTC P0325 is not reset, replace original KS and/or KS sub-harness.
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