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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P0328: Knock Sensor Circuit - High Input >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Inspect Knock Sensor Connector Terminal For Poor Connection -  Turn ignition off. Disconnect KS harness connector. Check for poor connection (such as damaged, pulled-out pins, corrosion) at KS harness connector terminal "A" (Yellow wire) and terminal "B" (Brown wire). See Figure. If malfunction is not present, go to next step. If there is any malfunction present, repair or replace terminal. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  7.
  4. Inspect Knock Sensor -  Perform KS inspection. Refer to KNOCK SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If KS is okay, go to next step. If KS is faulty, replace KS. After repair, go to step  7.
  5. Inspect Knock Sensor Signal Circuit For Short To Power -  Turn ignition on, engine off. Measure voltage between following:
    • KS harness connector terminal "A" (Yellow wire) and body GND
    • KS harness connector terminal "B" (Brown wire) and body GND
    If voltage reading is not present, go to next step. If any voltage reading is present, repair short circuit to power or replace suspected wire harness. After repair, go to step  7.
  6. Inspect PCM Connector Terminal For Poor Connection -  Turn ignition off. Disconnect PCM harness connectors. Inspect for poor connection (such as damaged, pulled-out pins, corrosion) at PCM 30-pin harness connector terminal "2P" (Brown wire) and "2S" (Yellow wire). See Figure. If malfunction is not present, go to next step. If any malfunction is present, repair or replace terminal. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step.
  7. Verify Trouble Shooting Of DTC P0328 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and warm it up completely. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  8. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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