Trouble CodeFault LocationProbable Cause
P0328 Knock sensor (KS) 1, bank 1 -high input Wiring short to positive, KS incorrectly tightened, KS, ECM

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What Does code P0328 Mean?

The hit sensor (KS) is placed in the engine and also is offered to finding spark knock. As soon as there is spark hit or pinging, the sensor produce a voltage signal the is sent out to PCM. The PCM will certainly then retard ignition timing to defend the engine.

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Inside, the knock sensor is a piezoelectric crystal. This decision is used to produce AC voltage under vibration. The hit sensor is a type of transducer, i beg your pardon is a an equipment that converts transforms in physics quantity into an electric signal. In other words, a hit sensor go not obtain a reference voltage from the PCM – it create its own.

There room two simple types of knock sensors: the style used in enlarge vehicles and also the resonant design used in contemporary vehicles.


Cross section of a typical knock sensor


P0328 represents knock sensor high input. This way the PCM has actually detected a problem with the knock sensor or that is circuit. Some vehicles might be equipped through two punch sensors. Password P0328 pertains to the sensor on financial institution 1 (the next of the engine where the #1 cylinder is located).

What room the common causes of password P0328 ?

To sum things up, the common reasons for password P0328 space as follows:

Failed punch sensorFault in the punch sensor circuitFailed PCM

What space the symptom of code P0328 ?

You may an alert a absence of power, uncertainty and/or pinging. In part cases, however, one illuminated examine engine light will be the only symptom.

How execute you troubleshoot password P0328 ?

The following steps will aid you troubleshoot a P0328 code:

Perform a intuitive inspection that the sensor and also connection.

Many problems can quickly be uncovered in the harness and connectors. So, begin your diagnosis through visually inspecting the sensor and its connection.

Perform a an easy test of the knock sensor

Note that this test will only work on old format knock sensors. Attach a timing light to the vehicle and start the engine. Permit the engine to warm up and also aim the time light toward the timing marks on the harmonic balancer. Situate the knock sensor and tap on one engine ar near the sensor (do not directly strike the sensor). If the sensor is working correctly, you must see the timing begin to retard. If not, you have actually a trouble with the sensor or its circuit. Hint: this check can also be carry out by security the ignition time on a scan tool, rather of using a timing light.

Test the sensor output

If your auto fails the simple test listed above, that time to determine what component of the sensor circuit is to blame. To check an old-style hit sensor, attach a digital multimeter collection to AC voltage in between the punch sensor output signal wire and also a good ground. Then when again, insanity on one engine place near the sensor. You have to see an AC voltage analysis on her digital multimeter. If not, the sensor is bad and should it is in replaced.


An old-style punch sensor



Testing an old-style punch sensor


To check a car with a resonant style sensor, you’ll attach your digital multimeter the same method as you would certainly for a Weidman style sensor. But, instead of tapping top top the engine block, you’ll start by removed the fuel pump relay to prevent the engine from starting. Crank the engine, put the vehicle in gear and also keep her foot top top the brake. Advice a little; as the auto is starved because that fuel it will begin to ping and you should see one AC voltage output. If not, the knock sensor is bad and should be replaced.


A resonant layout knock sensor


Check the circuit

If the punch sensor checks out OK, however you still have P0328 password illuminated, you’ll require to check the sensor circuit. Making use of a digital multimeter collection to the ohms, connect one side of the meter to the harness side of the punch sensor connector and also the other to the knock sensor input pin on the PCM. This tests because that continuity in between the sensor and PCM. If her meter reads OL, there is an open somewhere in the circuit that need to be repaired. If not, the PCM is likely the problem and should it is in replaced.

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Typical old-style punch sensor circuit


While old-style hit sensors ground with the sensor itself, resonant layout sensors typically have a separate ground circuit. In this case, you’ll desire to usage a digital multimeter to ensure there is a an excellent ground prior to condemning the PCM. Start by consulting the wiring diagram for your auto to determine which pin on the connector is power and which is ground. Next, connect the red multimeter bring about the battery optimistic terminal and the black lead to ground. You have to see a analysis of around 12 volts describe a an excellent ground. If not, you’ll have to consult the ground next of the wiring diagram to find where the circuit fault lies.