If The engine in your van is a 3.5L, the knock sensor is under the upper intake manifold. This has to be removed in order to access the sensor on top of the engine block. The job requires an upper intake gasket set and about 1.5 hours to do; if you are handy with tools. For those who aren't; better off leaving this one to the professionals.
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Error Code:P0325 Description:
Knock Sensor (KS) 1 Bank 1 - Circuit Malfunction Possible Cause:
Loss of power.
Poor connection, short to earth, short to positive, open circuit.
Knock sensor improperly torqued.
Engine control module (ECM).
Torque Knock Sensor 1 to specifications.
Check the resistance of the knock sensor (compare it to factory specs).
Check for broken/frayed wires leading to the sensor.
Replace the knock sensor.
Check Knock Sensor 1 and Knock Control.
This feature search for unusual (spontaneous) combustion. The sensor detects unusual vibrations and based on that it generates a voltage. Is this voltage outside a certain limit a DTC will be set.
P0325 NISSAN - Knock Sensor Circuit Malfunction Possible causes- Faulty knock sensor - Knock sensor circuit short to ground - Knock sensor circuit short to power - Knock sensor circuit open - Faulty Engine Control Module (ECM)
The tcs light will come on whenever the engine light is on, this is because the tcs cant operate correctly when engine is not running good so its shut down by the computer, the code if the only code means there a problem with the knock sensor, you will need to check the connection and make sure the wire is good and if it is then you will need to replace the knock sensor, heres a diagram to help you locate the knock sensor good luck, hope this helps,
po325 knock sensor 1 malfunction po340 camshaft position sensor malfunction po605 internal control modular (rom) read only memory error check the wiring to the computer for proper connection and damage the computer (pcm) may be damaged or its program erased this happens sometimes when the connector is unplugged and the battery is hooked up the other two can be related (pcm) failure or could be a wiring problem po325 check knock sensor wiring and sensor and same for po340 crank sensor wiring and sensor good luck