Infiniti FX35, FX50 (S51). Manual - part 832

P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE

EC-869

< DTC/CIRCUIT DIAGNOSIS >

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Is the inspection result normal?

YES

>> GO TO 17.

NO

>> Repair or replace malfunctioning part.

17.

ERASE THE 1ST TRIP DTC

Some tests may cause a 1st trip DTC to be set.
Erase the 1st trip DTC from the ECM memory after performing the tests. Refer to 

EC-705, "Diagnosis Descrip-

tion"

.

>> GO TO 18.

18.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

EC-870

< DTC/CIRCUIT DIAGNOSIS >

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P0327, P0328, P0332, P0333 KS

P0327, P0328, P0332, P0333 KS

Description

INFOID:0000000005237347

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.

DTC Logic

INFOID:0000000005237348

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
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

>> Go to 

EC-870, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237349

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-39, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK KNOCK SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Disconnect knock sensor harness connector and ECM harness connector.

2.

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

DTC No.

Trouble diagnosis name

DTC detected condition

Possible cause

P0327

Knock sensor (bank 1) circuit 
low input

An excessively low voltage from the sensor 
is sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Knock sensor

P0328

Knock sensor (bank 1) circuit 
high input

An excessively high voltage from the sensor 
is sent to ECM.

P0332

Knock sensor (bank 2) circuit 
low input

An excessively low voltage from the sensor 
is sent to ECM.

P0333

Knock sensor (bank 2) circuit 
high input

An excessively high voltage from the sensor 
is sent to ECM.

P0327, P0328, P0332, P0333 KS

EC-871

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3.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F49, F211
• Harness for open or short between knock sensor and ECM

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

4.

CHECK KNOCK SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

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

2.

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

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F49, F211
• Harness for open or short between ECM and knock sensor

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

6.

CHECK KNOCK SENSOR

Refer to 

EC-871, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace malfunctioning knock sensor.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005237350

1.

CHECK KNOCK SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect knock sensor harness connector.

3.

Check resistance between knock sensor terminals as per the following.
NOTE:

DTC

Knock sensor

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0327, P0328

1

F212

2

F110

35

Existed

P0332, P0333

2

F213

2

DTC

Knock sensor

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0327, P0328

1

F212

1

F110

40

Existed

P0332, P0333

2

F213

1

44

EC-872

< DTC/CIRCUIT DIAGNOSIS >

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P0327, P0328, P0332, P0333 KS

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

Ω

.

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.

Terminals

Resistance

1 and 2

Approx. 532 - 588 k

Ω

 [at 20

°

C (68

°

F)]