2000 Mazda MPV DXFACTORY OEM SERVICE PROCEDURE

DTC P0325: Knock Sensor Circuit Problem: Testing

NOTE: Ensure freeze frame data has been recorded. Check for service bulletins and on-line information.
  1. Turn ignition off. Disconnect PCM connector. PCM is mounted to passenger floor, behind glove box. Check all terminals. If no problems are present, go to next step. If any terminals are faulty, repair as necessary. After repair, go to step  6 .
  2. Disconnect knock sensor. Check continuity of circuits between sensor and PCM. See KNOCK SENSOR CIRCUIT IDENTIFICATION  table. If continuity is present, go to next step. If continuity is not present, repair as necessary. After repair, go to step  6 .
  3. Check for continuity between sensor circuits and ground. See KNOCK SENSOR CIRCUIT IDENTIFICATION  table. If continuity is not present, go to next step. If continuity is present, repair short to ground. After repair, go to step  6 .
  4. Check for continuity between sensor harness connector terminals "A" and "B". If continuity is not present, go to next step. If continuity is present, repair short between circuits. After repair, go to step  6 .
  5. Check resistance between sensor terminals "A" (Red wire) and "B" (Black wire). If resistance is about 560 ohms, go to next step. If resistance is not about 560 ohms, replace knock sensor and go to next step.
  6. Reconnect all components. Turn ignition on. Using scan tool, clear DTC. Start engine. Using scan tool, select ECT, RPM and LOAD PIDS. Operate vehicle under monitored conditions for more than 5 seconds. Recheck DTCs. If DTC P0325 is present, replace PCM and go to next step. If DTC P0325 is not present, go to next step.
  7. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If no DTC is present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
    KNOCK SENSOR CIRCUIT IDENTIFICATION

    Sensor Terminal Wire Color PCM Terminal No.
    "A" Blue/White 57
    "B" Red/White 66
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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