P0327

P0327, P0328, P0332, P0333 KS

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
1.Turn ignition switch OFF and wait at least 10 seconds.
2.Turn ignition switch ON.
3.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

1.Start engine and run it for at least 5 seconds at idle speed.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK KNOCK SENSOR GROUND CIRCUIT

1.Disconnect knock sensor harness connector and ECM harness connector.
2.Check the continuity between knock sensor harness connector and ECM harness connector.





3.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

2. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT

1.Check the continuity between knock sensor harness connector and ECM harness connector.
Revision: March 20122013 Infiniti JX





2.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

3. CHECK KNOCK SENSOR

Check knock sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace malfunctioning knock sensor. Refer to "Disassembly and Assembly" Disassembly and Assembly.


Component Inspection


1. CHECK KNOCK SENSOR

1.Turn ignition switch OFF.
2.Disconnect knock sensor harness connector.
3.Check resistance between knock sensor terminal as per the following.
NOTE:
It is necessary to use an ohmmeter which can measure more than 10 MOhms.






CAUTION:
Never 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 malfunctioning knock sensor. Refer to "Disassembly and Assembly" Disassembly and Assembly.
Revision: March 20122013 Infiniti JX