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Home >> Mazda >> 2002 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0327: Knock Sensor Circuit Low Input >> Diagnostic Procedure

Diagnostic Procedure

  1. Turn ignition off. Connect New Generation Star (NGS) tester or equivalent to OBD-II Data Link Connector-2 (DLC-2). See Figure. Turn ignition on. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check for service bulletins and/or other line of repair information related to this DTC. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  5. If repair information is not available, go to next step.
  2. Turn ignition off. Disconnect KS 2-pin harness connector. See Fig 1. Turn ignition on. Measure voltage between ground and KS harness connector terminal "A" (White wire). Voltage should be approximately 5 volts. If voltage is as specified, go to step  4. If voltage is not as specified, repair open or short circuit (in White wire) between KS and PCM. For circuit identification, see MIATA in WIRING DIAGRAMS article. After repair, go to step  5.
  3. Turn ignition off. Leave KS harness connector disconnected and disconnect PCM 31-pin harness connector. See Fig 1. Check for poor connection at terminal due to damaged, pulled-out pins, corrosion, etc. If connector terminals are okay, go to next step. If connector terminals are found faulty, repair or replace as necessary and go to step  5.
  4. With KS harness connector disconnected, measure resistance between KS sensor body ground and KS connector terminal "A"(component side). Resistance should be approximately 560 k/ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace KS sensor. After repair, go to next step.
  5. Return vehicle to original condition. Let vehicle cool down for 6 hrs. Using NGS tester or equivalent, clear DTCs from PCM memory. Start engine and let it idle for 5 minutes.Monitor for pending DTCs. If same DTC P0327 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. If any other DTC is present, follow appropriate DTC diagnostic procedure.
Fig 1: Identifying Knock Sensor and Powertrain Control Module Connectors Terminals
G00140062Courtesy of MAZDA MOTORS CORP.
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