DTC Advanced Diagnostics: P0327, P0328 (K20C1)

DTC Advanced Diagnostics: P0327, P0328

DTC P0327:Knock Sensor Circuit Low Voltage
DTC P0328:Knock Sensor Circuit High Voltage

General Description

A piezo sensitive knock sensor is mounted on cylinder block. The powertrain control module (PCM) monitors the knock sensor for electrical malfunctions. The knock sensor transforms the structure borne vibrations into electrical signals which can be evaluated by the PCM. The knock sensor signal is evaluated according to intensity and spectral information of knocking and non-knocking combustions. The output voltage of the knock sensor is continuously monitored against minimum and maximum thresholds. If the knock sensor output voltage is a specified value for a specified time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	–
DTC Type	Two drive cycles, MIL on

Enable Conditions

Condition	Minimum	Maximum
Engine speed [Engine Speed]	1,000 rpm	–
Other	Condition in steady engine load and engine speed

[ ]: HDS Parameter

Malfunction Threshold

DTC: P0327

The knock sensor output voltage is less than -0.7 V at least 3 events.

DTC: P0328

The knock sensor output voltage is greater than 1 V at least 3 events.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

DTC: P0327

	Knock sensor KS POS line short to ground
	Knock sensor KS NEG line short to ground

DTC: P0328

	Knock sensor KS POS line short to power
	Knock sensor KS NEG line short to power

Common

	Knock sensor failure
	PCM internal circuit failure

Confirmation Procedure

Operating Condition

Start the engine, hold the engine speed [Engine Speed] over 1,000 rpm.

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.