Trouble CodeFault LocationProbable Cause
P0325 Knock sensor (KS) 1 , bank 1 -circuit breakdown Wiring, poor connection, KS

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What Does code P0325 Mean?

The punch sensor (KS) is mounted in the engine and also is supplied to recognize spark knock. When there is spark knock or pinging, the sensor produces a voltage signal that is sent to PCM. The PCM will then retard ignition time to defend the engine.

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Inside, the punch sensor is a piezoelectric crystal. This crystal is used come produce AC voltage under vibration. The knock sensor is a type of transducer, i m sorry is a device that converts alters in physics quantity into an electric signal. In various other words, a punch sensor walk not obtain a referral voltage native the PCM – it creates its own.

There are two simple types of knock sensors: the layout used in larger vehicles and also the resonant design used in contemporary vehicles.


Cross ar of a usual knock sensor


P0325 stands for knock sensor circuit malfunction. This way the PCM has actually detected a trouble with the punch sensor or that is circuit. Some vehicles may be equipped through two hit sensors. Password P0325 comes to the sensor on bank 1 (the next of the engine whereby the #1 cylinder is located).

What are the common causes of code P0325 ?

To amount things up, the common reasons for code P0325 room as follows:

Failed punch sensorFault in the punch sensor circuitFailed PCM

What room the symptom of code P0325 ?

You may notification a absence of power, suspicion and/or pinging. In some cases, however, one illuminated inspect engine light will certainly be the only symptom.

How execute you troubleshoot code P0325 ?

The adhering to steps will aid you troubleshoot a P0325 code:

Perform a intuitive inspection of the sensor and also connection.

Many difficulties can conveniently be discovered in the harness and connectors. So, begin your diagnosis by visually inspecting the sensor and also its connection.

Perform a basic test the the hit sensor

Note that this test will certainly only work-related on old layout knock sensors. Attach a timing irradiate to the vehicle and also start the engine. Enable the engine to warm up and aim the time light toward the time marks top top the harmonic balancer. Find the hit sensor and also tap on one engine ar near the sensor (do not straight strike the sensor). If the sensor is working correctly, you have to see the timing begin to retard. If not, you have actually a trouble with the sensor or that circuit. Hint: this test can additionally be performed by monitoring the ignition timing on a scan tool, instead of using a time light.

Test the sensor output

If your automobile fails the straightforward test listed above, the time to recognize what component of the sensor circuit is come blame. To test an old-style knock sensor, connect a digital multimeter set to AC voltage in between the knock sensor output signal wire and also a good ground. Then as soon as again, madness on one engine location near the sensor. You have to see an AC voltage analysis on her digital multimeter. If not, the sensor is bad and also should be replaced.


An old-style hit sensor



Testing one old-style hit sensor


To check a auto with a resonant layout sensor, you’ll affix your digital multimeter the same means as you would for a Weidman style sensor. But, rather of tapping on the engine block, you’ll start by removed the fuel pump relay to prevent the engine native starting. Crank the engine, placed the vehicle in gear and also keep her foot on the brake. Accelerate a little; as the auto is starved for fuel that will start to ping and also you have to see one AC voltage output. If not, the punch sensor is bad and also should be replaced.

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A resonant layout knock sensor


Check the circuit

If the punch sensor checks out OK, but you still have P0325 code illuminated, you’ll require to check the sensor circuit. Using a digital multimeter set to the ohms, affix one side of the meter to the harness side of the knock sensor connector and the other to the hit sensor input pen on the PCM. This tests for continuity in between the sensor and also PCM. If her meter reads OL, over there is an open somewhere in the circuit that have to be repaired. If not, the PCM is most likely the problem and should be replaced.


Typical old-style hit sensor circuit


While old-style punch sensors ground with the sensor itself, resonant format sensors generally have a separate ground circuit. In this case, you’ll want to use a digital multimeter come ensure over there is a an excellent ground before condemning the PCM. Begin by consulting the wiring diagram for your automobile from all DATA DIY to determine which pin on the connector is power and which is ground. Next, affix the red multimeter bring about the battery positive terminal and the black cause ground. You have to see a analysis of around 12 volts describe a good ground. If not, you’ll should consult the ground side of the wiring diagram to uncover where the circuit error lies.