P0328 - KNOCK SENSOR CIRCUIT HIGH INPUT

The Knock Sensor (KS) is used to detect the knocking of the motor. In general, this sensor has two wires, one that gives a 5 volt reference to the sensor and the other wire is a return signal that comes from the Knock Sensor (KS) to the Powertrain Control Module (PCM).

The signal cable gives information to the Power Train Control Module (PCM) when a blow occurs, in addition to indicating the seriousness of said blow. Typically, the PCM can learn the spark shock tendencies of the engine when it functions normally.

When the P0328 DTC code is established, OBD2 indicates that the voltage has exceeded 4.5 volts, but it must be taken into account that this value depends on the make and model of the vehicle.

• The Check Engine light is on.
• You could hear a blow coming from the engine compartment.
• loss of power.
• Instability in the RPM.

The factors that can lead to the establishment of the P0328 OBDII fault code can be:

• The Knock Sensor (KS) connector may be defective.
• The Knock Sensor (KS) circuit may be shorted to voltage.
• The KS sensor circuit can be shorted to ground.
• Maybe the KS sensor is defective or loose.
• A bad electrical connection in the circuit.
• The fuel rate may not be correct.

Before a diagnostic code P0328 you can do the following:

• If you hear a blow to the engine like a detonation, you can verify the cause of the mechanical problem.
• Check that the fuel with which you supplied is correct.
• Measure the resistance between the two terminals of the Knock Sensor (KS) cable to the Powertrain Control Module (PCM). Also check the voltage of both terminals. You can compare the result of these measurements with the factory specifications.
• You can also verify that components such as cables and connectors that go from the Knock Sensor (KS) to the Power Train Control Module (PCM) are in good condition. Repair or replace if you find a problem in one of these.
• With a digital multimeter, check the resistance of the KS sensor and compare the result with the factory specifications. If you notice that the value of the sensor resistance is not within the range expected by the manufacturer, it replaces the KS sensor.