P0328

P0327, P0328, P0332, P0333 KS

Component Description

The knock sensor is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a voltage signal and sent to the ECM.





On Board Diagnosis Logic

The MIL will not illuminate for these diagnoses.






DTC Confirmation Procedure

NOTE:

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

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.
4) Start engine and run it for at least 5 seconds at idle speed.
5) Check 1st trip DTC.
6) If 1st trip DTC is detected, go to "Diagnosis Procedure".

Diagnosis Procedure

1. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I

1 Turn ignition switch OFF.
2 Disconnect ECM harness connector.
3 Check resistance between ECM terminals 15, 36 and ground. Refer to Wiring Diagram.

NOTE:
It is necessary to use an ohmmeter which can measure more than 10 Mohms.






4 Also check harness for short to ground and short to power.

OK or NG
OK
GO TO 5.
NG
GO TO 2.

2. CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II

1 Disconnect knock sensor harness connector.





2 Check harness continuity between ECM terminal 15 and knock sensor (bank1) terminal 1, ECM terminal 36 and knock sensor (bank 2) terminal 1.
Refer to Wiring Diagram.






3 Also check harness for short to ground and short to power.

OK or NG
OK
GO TO 4.
NG
GO TO 3.

3. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors F67, F250
- Harness for open or short between ECM and knock sensor


Repair open circuit or short to ground or short to power in harness or connectors.

4. CHECK KNOCK SENSOR

Refer to "Component Inspection".

OK or NG
OK
GO TO 5.
NG
Replace malfunctioning knock sensor. Refer to [Engine Unit: Exploded View] Exploded View.

5. CHECK GROUND CONNECTIONS

1 Turn ignition switch OFF.
2 Loosen and retighten three ground screws on the body.
Refer to [Power Supply and Ground Circuit Check] Power Supply and Ground Circuit Check.






OK or NG
OK
GO TO 6.
NG
Repair or replace ground connections.

6. CHECK KNOCK SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT

1 Disconnect knock sensor harness connector.
2 Check harness continuity between knock sensor terminal 2 and ground. Refer to Wiring Diagram.






OK or NG
OK
GO TO 8.
NG
GO TO 7.

7. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors F67, F250
- Harness connectors F14, E5
- Harness for open or short between knock sensor and ground


Repair open circuit or short power in harness or connectors.

8. CHECK INTERMITTENT INCIDENT

Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.


INSPECTION END

Component Inspection

Knock Sensor

Check resistance between knock sensor terminal 1 and ground.





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.