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DTC P0325: Knock Sensor Circuit: Testing

  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed and equal to zero, go to next step. If GOOD TRIP counter is not displayed and equal to zero, go to step  8 .
  2. Turn ignition off. Disconnect knock sensor harness connector. Knock sensor is threaded into top cylinder block between cylinder heads. Removal of intake manifold may be necessary to access knock sensor. Measure voltage between ground and signal circuit (Black/Violet wire on 2.7L; Dark Blue/Light Green wire on 3.2L/3.5L) at knock sensor harness connector. If voltage is 2 volts or less, go to next step. If voltage is more than 2 volts, repair short to voltage in signal circuit.
  3. Turn ignition off. Disconnect PCM harness connectors. See Figure . Measure resistance between ground and signal circuit (Black/Violet wire on 2.7L; Dark Blue/Light Green wire on 3.2L/3.5L) at knock sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in signal circuit.
  4. On 2.7L models, measure resistance of signal circuit (Black/Violet wire) between knock sensor harness connector and terminal No. 25 at PCM C1 harness connector. On 3.2L/3.5L models, measure resistance of signal circuit (Dark Blue/Light Green wire) between knock sensor harness connector and terminal No. 24 at PCM C1 harness connector. On all models, refer to illustration. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in signal circuit.
  5. On 2.7L models, measure resistance between signal circuit (Black/Violet wire) and sensor ground circuit (Black/Light Blue wire) at knock sensor harness connector. On 3.2L/3.5L models, measure resistance between signal circuit (Dark Blue/Light Green wire) and sensor ground circuit (Black/Violet wire) at knock sensor harness connector. On all models, if resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short between signal circuit and sensor ground circuit.
  6. On 2.7L models, measure resistance of sensor ground circuit (Black/Light Blue wire) between knock sensor harness connector and terminal No. 43 at PCM C2 harness connector. On 3.2/3.5L models, measure resistance of sensor ground circuit (Black/Violet wire) between knock sensor harness connector and terminal No. 25 at PCM C1 harness connector. On all models, if resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in sensor ground circuit.
  7. Replace knock sensor. Turn ignition on. Using scan tool, clear DTC. Attempt to operate vehicle using information noted in freeze frame data. Using scan tool, read DTCs. If DTC P0325 is displayed, replace PCM. If DTC P0325 is not displayed, test is complete.
  8. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
    • With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
    • Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
    • Refer to any technical service bulletins that may apply.
    • Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
    • Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.

    If a problem is found, repair as necessary. If no problems are found, test is complete.

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