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DTC P0325: Knock Sensor Circuit

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: Monitored with ignition on and engine running. Set condition is when knock sensor circuit voltage falls to less than a minimum value at idle or deceleration. The minimum value is from a look-up table internal to PCM and is based on engine RPM. The DTC also sets if sensor output is more than 5 volts. Possible causes are: knock sensor signal circuit open, knock sensor signal circuit shorted to voltage, defective knock sensor, knock sensor ground circuit open or knock sensor signal circuit shorted to ground.
  1. Turn ignition off. Disconnect knock sensor 1-pin connector. Knock sensor is threaded into cylinder block. Turn ignition on with engine off. Using a DVOM, check voltage of knock sensor connector signal circuit (Dark Blue/Light Green wire). If voltage is 2 volts or less, go to next step. If voltage is more than 2 volts, repair signal circuit for a short to voltage. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  2. Turn ignition off. Using a DVOM, check resistance of signal circuit between knock sensor connector (Dark Blue/Light Green wire) and chassis ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair signal circuit open circuit. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  3. Disconnect Powertrain Control Module (PCM) connector C1 (located nearest to front of vehicle). PCM is located to left of Power Distribution Center (PDC) in engine compartment. Inspect electrical connector and clean/repair as necessary. Using a DVOM, check resistance between knock sensor connector (Dark Blue/Light Green wire) and PCM connector C1 terminal No. 25 (Dark Blue/Light Green wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open signal circuit. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  4. Using a DVOM, check resistance between knock sensor connector (Dark Blue/Light Green wire) and chassis ground. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair signal circuit short to ground. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  5. If no other potential causes are remaining, knock sensor is assumed to be defective. Replace knock sensor. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
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