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Home >> Toyota >> 2000 >> MR2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0325: Knock Sensor Circuit >> Diagnosis & Repair
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Diagnosis & Repair

  1. Access ECM on driver's side of firewall behind driver's seat, luggage compartment lids and partition board. See Figure. Disconnect ECM harness connector E5. See Figure. Use DVOM, backprobe ECM harness connector and measure resistance between ground and terminal No. 27 (Black wire) at ECM harness connector E5. Resistance should be one megohm or more. If resistance is not as specified, go to next step. If resistance is as specified, go to step  3.
  2. Disconnect knock sensor harness connector. Knock sensor is located on side of engine block, just below the intake manifold. Check continuity between knock sensor terminal and knock sensor housing. If continuity does not exist, go to next step. If continuity exists, replace knock sensor.
    3. NOTE: Circuit between knock sensor and ECM changes color. Circuit is a White wire at knock sensor and a Black wire at ECM.
  3. Check for open or short in wiring between knock sensor and ECM. See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, substitute knock sensor with known-good knock sensor. Clear and then retrieve DTCs. If DTC P0325 is still displayed, replace ECM. If DTC P0325 is no longer displayed, original knock sensor is defective.
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