Infiniti M45 (Y34). Manual - part 404

DTC P0327, P0328, P0332, P0333 KS

EC-305

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Wiring Diagram

ABS002JC

TBWM0021E

EC-306

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

ABS002JD

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws. 
Refer to 

EC-141, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2. 

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

1.

Disconnect ECM harness connector.

2.

Check resistance between ECM terminals 125, 126 and ground. 
Refer to Wiring Diagram.

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

Ω

.

3.

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

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 3.

3. 

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 125 and knock sensor (bank 1) terminal 1, 
ECM terminal 126 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 7.

NG

>> GO TO 4.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

125
126

W
W

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

[Engine is running]

●

Idle speed

Approximately 2.5V

PBIB1118E

Resistance:

Approximately 530 - 590k

Ω

 [at 20

°

C (68

°

F)]

Continuity should exist.

PBIB0021E

DTC P0327, P0328, P0332, P0333 KS

EC-307

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4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connector F40, 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.

5. 

KNOCK SENSOR SHIELD CIRCUIT FOR OPEN AND SHORT

1.

Disconnect harness connectors F40, F241.

2.

Check harness continuity between the following;
harness connector F40 terminal 1 and ground
harness connector F40 terminal 3 and ground. 
Refer to wiring Diagram.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connector F40, F241

●

Harness for open or short between ECM and ground.

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

7. 

CHECK KNOCK SENSOR

Refer to 

EC-307, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace knock sensor.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS002JE

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 M

Ω

.

CAUTION:

Do not use any knock sensors that have been dropped or phys-
ically damaged. Use only new ones.

Continuity should exist.

Resistance:

Approximately 530 - 590k

Ω

 [at 20

°

C (68

°

F)]

SEF478Y

EC-308

DTC P0327, P0328, P0332, P0333 KS

Removal and Installation

ABS002JF

KNOCK SENSOR

Refer to 

EM-80, "CYLINDER BLOCK"

 .