Infiniti FX35, FX50 (S51). Manual — part 832
P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE
EC-869
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
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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
.
>> GO TO 18.
18.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
>> INSPECTION END
EC-870
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
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
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
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
< DTC/CIRCUIT DIAGNOSIS >
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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
EC-871, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace malfunctioning knock sensor.
7.
CHECK INTERMITTENT INCIDENT
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 >
[VK50VE]
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)]
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