Infiniti M35/M45 Y50. Manual — part 649

DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-

FIRE

EC-1069

[VK45DE]

C

D

E

F

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A

EC

19.

CHECK INTERMITTENT INCIDENT

Refer to

EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

.

>> INSPECTION END

EC-1070

[VK45DE]

DTC P0327, P0328, P0332, P0333 KS

DTC P0327, P0328, P0332, P0333 KS

PFP:22060

Component Description

NBS005G6

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

NBS005G7

The MIL will not light up for these diagnoses.

DTC Confirmation Procedure

NBS005G8

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

WITH CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.

2.

Start engine and run it for at least 5 seconds at idle speed.

3.

If 1st trip DTC is detected, go to

EC-1072, "Diagnostic Proce-

dure"

.

WITH GST

Follow the procedure “WITH CONSULT-II” above.

PBIB0021E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0327
0327
(bank 1)

Knock sensor 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

P0332
0332
(bank 2)

P0328
0328
(bank 1)

Knock sensor circuit high
input

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

P0333
0333
(bank 2)

SEF058Y

DTC P0327, P0328, P0332, P0333 KS

EC-1071

[VK45DE]

C

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A

EC

Wiring Diagram

NBS005G9

TBWT1026E

EC-1072

[VK45DE]

DTC P0327, P0328, P0332, P0333 KS

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

NBS005GA

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 M

Ω

.

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 the following;
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 F47, F241

●

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

EC-1074, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace knock sensor.

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

15
36

W
W

Knock sensor (bank 1)
Knock sensor (bank 2)

[Engine is running]

●

Idle speed

Approximately 2.5V

Resistance: Approximately 532 - 588 k

Ω

[at 20

°

C (68

°

F)]

Continuity should exist.

PBIB0021E