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Knock Sensor Malfunction

DTC DETECTION CONDITION POSSIBLE COUSES CHART

DTC P0325 KNOCK SENSOR MALFUNCTION
DETECTION CONDITION
  • P0325 indicates a knock sensor circuit malfunction.
POSSIBLE CAUSES
  • Knock sensor circuit short to GND
  • Knock sensor circuit short to PWR
  • Open knock sensor circuit
  • Damaged knock sensor
  • Damaged PCM
HINT Knock Sensor Description 
  • A tuned accelerometer on the engine that converts engine vibration to an electrical signal.
  • The PCM uses this signal to determine the presence of engine knock and retard spark timing if necessary.
G06157101Courtesy of MAZDA MOTORS CORP.
G06157102Courtesy of MAZDA MOTORS CORP.
DTC DETECTION CONDITION POSSIBLE COUSES CHART

STEP INSPECTION ACTION
1 VERIFY TROUBLESHOOTING OF DTCs COMPLETED
  • Is DTC P0325 present? 
 Yes GO to the next step.
No See DTC INDEX - PCM  .
2 KOER AND CONTINUOUS MEMORY DTC P0325: CHECK THE INTERNAL RESISTANCE OF THE KNOCK SENSOR
  • KS connector disconnected.
  • Measure the resistance between (+) KS connector KS+, component side and (-) KS connector KS-, component side.
  • Is the resistance between 4.39M - 5.35M ohms? 
 Yes GO to the next step.
No INSTALL a new KS. See KNOCK SENSOR (KS) REMOVAL/INSTALLATION - 2.5L . CLEAR the DTCs. REPEAT the self-test.
3 CHECK THE KS+ CIRCUIT FOR AN OPEN IN THE HARNESS
  • Key OFF.
  • PCM connector disconnected.
  • Measure the resistance between (+) KS connector KS+, harness side and (-) PCM connector KS+, harness side.
  • Is the resistance less than 5 ohms? 
 Yes GO to the next step.
No REPAIR the open circuit. CLEAR the DTCs.
REPEAT the self-test.
4 CHECK THE KS-CIRCUIT FOR AN OPEN IN THE HARNESS
  • Measure the resistance between (+) KS connector KS-, harness side and (-) PCM connector KS-, harness side.
  • Is the resistance less than 5 ohms? 
 Yes GO to the next step.
No REPAIR the open circuit. CLEAR the DTCs.
REPEAT the self-test.
5 CHECK THE KS+ CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS
  • Measure the resistance between (+) KS connector KS+, harness side and (-) vehicle battery negative terminal.
  • Is the resistance greater than 10K ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs.
REPEAT the self-test.
6 CHECK THE KS-CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS
  • Measure the resistance between (+) KS connector KS-, harness side and (-) vehicle battery negative terminal.
  • Is the resistance greater than 10K ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs.
REPEAT the self-test.
7 CHECK THE KS+ CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS
  • Measure the resistance between (+) KS connector KS+, harness side and (-) PCM connector VPWR, harness side.
  • Measure the resistance between (+) KS connector KS+, harness side and (-) PCM connector VREF, harness side.
  • Are the resistances greater than 10K ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs.
REPEAT the self-test.
8 CHECK THE KS-CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS
  • Measure the resistance between (+) KS connector KS-, harness side and (-) PCM connector VREF, harness side.
  • Measure the resistance between (+) KS connector KS-, harness side and (-) PCM connector VPWR, harness side.
  • Are the resistances greater than 10K ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs.
REPEAT the self-test.
9 CHECK THE KS+ CIRCUIT FOR INTERMITTENT CONCERNS
NOTE:
  • Carefully wiggle all accessible wiring and connectors associated with the KS circuit.
  • Measure the resistance between (+) KS connector KS+, harness side and (-) PCM connector KS+, harness side.
  • Is the resistance less than 5 ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs.
REPEAT the self-test.
10 CHECK THE KS-CIRCUIT FOR INTERMITTENT CONCERNS
NOTE:
  • Carefully wiggle all accessible wiring and connectors associated with the KS circuit.
  • Measure the resistance between (+) KS connector KS-, harness side and (-) PCM connector KS-, harness side.
  • Is the resistance less than 5 ohms? 
 Yes GO to the next step.
No REPAIR the short circuit. CLEAR the DTCs.
REPEAT the self-test.
11 VERIFY TROUBLESHOOTING OF DTCs COMPLETED
  • Disconnect all the PCM connectors.
  • Check for:
    • corrosion
    • damaged pins
    • pushed-out pins
  • Connect all connectors and make sure they seat correctly.
  • Clear DTCs from PCM memory using IDS or equivalent generic OBD II tester.
  • Carry out the PCM Quick Test. See PCM QUICK TEST  .
  • Is the same DTC present? 
 Yes INSTALL a new PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL/INSTALLATION - 2.5L or POWERTRAIN CONTROL MODULE (PCM) REMOVAL/INSTALLATION - 3.0L . REPEAT the PCM Quick Test. See PCM QUICK TEST  .
No If any other DTC is present, go to applicable DTC inspection.
If no DTC is present, troubleshooting complete.
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