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Home >> Mazda >> 2002 >> Protege5 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0325: Knock Sensor Circuit Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  7.
  2. Disconnect PCM 104-pin harness connector. Check for damaged or corroded connector terminals. Repair as necessary, and go to step  7. If connector terminals are okay, go to next step.
  3. Disconnect KS harness connector. Check for continuity of Yellow/Blue wire between KS harness connector terminal "A" and PCM 104-pin harness connector terminal No. 57. See Figure. Also check for continuity of Red wire between KS harness connector terminal "B" and PCM 104-pin harness connector terminal No. 59. See Figure. If continuity is present in both wires, go to next step. If continuity is not present in either wire, repair open in suspect wire. See WIRING DIAGRAMS article. Go to step  7.
  4. Check for continuity between ground and KS harness connector terminals. If continuity is not present at both terminals, go to next step. If continuity is present at either terminal, repair short to ground in suspect wire. See WIRING DIAGRAMS article. Go to step  7.
  5. Check for continuity between KS harness connector terminals. If continuity is not present, go to next step. If continuity is present, repair short between KS circuits. See WIRING DIAGRAMS article. Go to step  7.
  6. Measure resistance between KS terminals. If resistance is about 560,000 ohms, go to next step. If resistance is not about 560,000 ohms, replace KS and go to next step.
  7. Reconnect all connections. Turn ignition switch on. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Operate vehicle under following conditions; engine coolant temperature more than 140°F (60°C), engine load more than 50 percent, and engine RPM 1500-5000. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0325 is present, replace PCM and go to next step. See REMOVAL, OVERHAUL & INSTALLATION article. If DTC P0325 is not present, go to next step.
  8. Cycle ignition switch from off to on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If no other DTCs are present, testing is complete. If any other DTC is present, go to applicable test and repair.
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