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Knock Sensor Malfunction

DTC P0325, P0326, P0327, P0328, P0329 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0325, P0326, P0327, P0328, P0329 KNOCK SENSOR MALFUNCTION
DETECTION CONDITION
  • P0325 indicates a knock sensor circuit malfunction.
  • P0326 - P0329 indicate a knock sensor has detected vibrations (voltage generated based on this vibration) upon an increase and decrease in engine rpm that is outside a calibrated level.
POSSIBLE CAUSE
  • 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.
G04318980Courtesy of MAZDA MOTORS CORP.
DTC P0325, P0326, P0327, P0328, P0329 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1
  • Was PCM Quick Test performed? 
 Yes Go to next step.
No Perform PCM Quick Test. See PCM QUICK TEST .
2 CHECK VOLTAGE BETWEEN SENSOR AND SIG RTN
  • Verify KS sensor is installed properly and connector is connected.
  • Complete the repair verification drive cycle. See DRIVE CYCLE .
  • Key ON, Engine OFF (KOEO).
  • Access KSI PID.
  • Is KSI PID less than 0.5 volts? 
 Yes Key OFF.
Go to next step.
No Go to step 6.
3 CHECK KS SENSOR RESISTANCE
  • Disconnect PCM.
  • Install Breakout Box, leave PCM disconnected.
  • Measure the resistance between PCM test pin E20 and PCM test pin E32.
  • Is the resistance between 4.39 and 5.35 mega ohms? 
 Yes Go to step 7.
No For resistances greater than 5.35 mega ohms, go to next step.
For resistances less than 4.39 mega ohms, go to step 5.
4 CHECK FOR OPEN OF KS+ CIRCUIT
  • Disconnect KS sensor.
  • Measure the resistance of KS+ circuit between PCM test pin E32 and the KS pin 2, circuit (Y/R).
  • Is the resistance less than 5.0 ohms? 
 Yes Replace KS sensor, See KNOCK SENSOR (KS) - 2.3L .
Go to step 8.
No Repair open circuit.
Go to step 8.
5 CHECK KS+ CIRCUIT FOR SHORT TO GROUND IN HARNESS
  • Measure the resistance of KS+ circuit between PCM test pin E32 and chassis ground.
  • Measure the resistance of KS-circuit between PCM test pin E20 and chassis ground.
  • Is the resistance greater than 10K ohms? 
 Yes Go to next step.
No Repair short circuit.
Go to step 8.
6 CHECK KS CIRCUITS FOR SHORT TO POWER IN HARNESS
  • Connect PCM to Breakout Box.
  • Key ON, Engine OFF (KOEO).
  • Measure the voltage of KS+ circuit between PCM test pin E32 and battery negative post.
  • Measure the voltage of KS-circuit between PCM test pin E20 and battery negative post.
  • Was bias voltage reading less than 1.0 V? 
 Yes Replace PCM, See POWERTRAIN CONTROL MODULE (PCM) .
Go to step 8.
No Repair short circuit.
Go to step 8.
7 CHECK PCM FOR SHORT TO GROUND
  • Measure the resistance between KS+ and KS-circuits at the KS harness connector.
  • Is the resistance greater than 10K ohms? 
 Yes Replace KS sensor, See KNOCK SENSOR (KS) - 2.3L .
Go to next step.
No Replace PCM, See POWERTRAIN CONTROL MODULE (PCM) .
Go to next step.
8 VERIFY TROUBLESHOOTING OF DTCs COMPLETED
  • Make sure to reconnect all disconnected connectors.
  • Clear DTCs from PCM memory using WDS or equivalent tester generic OBD II function.
  • Perform PCM Quick Test. See PCM QUICK TEST .
  • Is any DTC present? 
 Yes Replace PCM, See POWERTRAIN CONTROL MODULE (PCM) . Repeat 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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