Infiniti Q45. Manual - part 431

 

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Infiniti Q45. Manual - part 431

 

 

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

FIRE

EC-363

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EC

14. 

CHECK AIR FUEL RATIO (A/F) SENSOR 1 INPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect corresponding air fuel ratio (A/F) sensor 1 harness connector.

3.

Disconnect ECM harness connector.

4.

Check harness continuity between the following terminals.
Refer to Wiring Diagram.

5.

Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.

6.

Also check harness for short to power.

OK or NG

OK

>> GO TO 15.

NG

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

: Vehicle front

1.

A/F sensor 1 (bank 2) 
harness connector

2.

A/F sensor 1 (bank 1) 
harness connector

A/F sensor 1 terminal

ECM terminal

Bank 1

1

16

2

75

5

35

6

56

Bank 2

1

76

2

77

5

57

6

58

Continuity should exist.

Bank 1

Bank 2

A/F sensor 1 terminal

ECM terminal

A/F sensor 1 terminal

ECM terminal

1

16

1

76

2

75

2

77

5

35

5

57

6

56

6

58

Continuity should not exist.

PBIB3134E

EC-364

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

FIRE

15. 

CHECK A/F SENSOR 1 HEATER

Refer to 

EC-179, "Component Inspection"

 .

OK or NG

OK

>> GO TO 16.

NG

>> Replace malfunctioning A/F sensor 1.

16. 

CHECK MASS AIR FLOW SENSOR

 With CONSULT-II

Check mass air flow sensor signal in “DATA MONITOR” mode with CONSULT-II.

 With GST

Check mass air flow sensor signal in “Service $01” with GST.

OK or NG

OK

>> GO TO 17.

NG

>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or

grounds. Refer to 

EC-204, "DTC P0102, P0103 MAF SENSOR"

 .

17. 

CHECK SYMPTOM MATRIX CHART

Check items on the rough idle symptom in 

EC-91, "Symptom Matrix Chart"

 .

OK or NG

OK

>> GO TO 18.

NG

>> Repair or replace.

18. 

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-61, "HOW TO ERASE

EMISSION-RELATED DIAGNOSTIC INFORMATION"

 .

>> GO TO 19.

19. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

3.8 - 5.2 g·m/sec:

at idling

16.0 - 21.5 g·m/sec:

at 2,500 rpm

3.8 - 5.2 g·m/sec:

at idling

16.0 - 21.5 g·m/sec:

at 2,500 rpm

DTC P0327, P0328, P0332, P0333 KS

EC-365

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DTC P0327, P0328, P0332, P0333 KS

PFP:22060

Component Description

NBS001W3

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

NBS001W4

The MIL will not light up for these diagnoses.

DTC Confirmation Procedure

NBS001W5

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-367, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure WITH CONSULT-II above.

PBIB0021E

DTC No.

Trouble Diagnosis Name

DTC Detected 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

EC-366

DTC P0327, P0328, P0332, P0333 KS

Wiring Diagram

NBS001W6

TBWM0549E

 

 

 

 

 

 

 

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