Nissan Sentra Service Manual: P0327, P0328 KS

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P0327, P0328 KS

DTC Logic

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detecting condition	Possible cause
P0327	KNOCK SEN/CIRC-B1 (Knock sensor 1 circuit low bank 1)	An excessively low voltage from the knock sensor is sent to ECM.	Harness or connectors (Knock sensor circuit is open or shorted.) Knock sensor
P0328	KNOCK SEN/CIRC-B1 (Knock sensor 1 circuit high bank 1)	An excessively high voltage from the knock sensor is sent to ECM.

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE

Start engine and run it for at least 5 seconds at idle speed.
Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-275, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK KNOCK SENSOR GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect knock sensor harness connector.
Disconnect ECM harness connector.
Check the continuity between knock sensor harness connector and ECM harness connector.

Also check harness for short to power.

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace error-detected parts.

2.CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT

Check the continuity between knock sensor harness connector and ECM harness connector.

Also check harness for short to ground and to power.

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

3.CHECK KNOCK SENSOR

Check knock sensor. Refer to EC-276, "Component Inspection (KS)".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace knock sensor. Refer to EM-94, "Exploded View".

Component Inspection (KS)

1.CHECK KNOCK SENSOR

Turn ignition switch OFF.
Disconnect knock sensor harness connector.
Check resistance between knock sensor terminals as per the following.

NOTE:

It is necessary to use an ohmmeter which can measure more than 10 MΩ.

CAUTION:

CAUTION:

Do not use any knock sensors that have been dropped or physically damaged. Use only new ones.

Is the inspection result normal? YES >> INSPECTION END

NO >> Replace knock sensor. Refer to EM-94, "Exploded View".

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