Infiniti Q45. Manual - part 430

 

  Index      Infiniti     Infiniti Q45 - service repair manual 2006 year

 

Search            copyright infringement  

 

 

 

 

 

 

 



 

 

Content   ..  428  429  430  431   ..

 

 

Infiniti Q45. Manual - part 430

 

 

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

FIRE

EC-359

C

D

E

F

G

H

I

J

K

L

M

A

EC

5. 

CHECK FUNCTION OF FUEL INJECTOR-II

Provide battery voltage between the following terminals, and then
interrupt it. Listen to each fuel injector operating sound.

OK or NG

OK

>> GO TO 6.

NG

>> Perform trouble diagnosis for 

EC-706, "FUEL INJECTOR"

 .

Cylinder

Harness connector

terminal

(+)

(–)

1

F201

5

3

3

2

5

1

7

6

2

F221

5

3

4

2

6

1

8

6

Operating sound should exist.

PBIB2449E

EC-360

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

FIRE

6. 

CHECK FUNCTION OF IGNITION COIL-I

CAUTION:

Do the following procedure in the place where ventilation is good without the combustible.

1.

Turn ignition switch OFF.

2.

Remove fuel pump fuse in fuse block No. 1 to release fuel pres-
sure.

NOTE:
Do not use CONSULT-II to release fuel pressure, or fuel pres-
sure applies again during the following procedure.

3.

Start engine.

4.

After engine stalls, crank it two or three times to release all fuel
pressure.

5.

Turn ignition switch OFF.

6.

Remove all ignition coil harness connectors to avoid the electri-
cal discharge from the ignition coils.

7.

Remove ignition coil and spark plug of the cylinder to be checked.

8.

Crank engine for 5 seconds or more to remove combustion gas in the cylinder.

9.

Connect spark plug and harness connector to ignition coil.

10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm

between the edge of the spark plug and grounded metal portion
as shown in the figure.

11. Crank engine for about three seconds, and check whether spark

is generated between the spark plug and the grounded metal
portion.

CAUTION:

Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock
while checking, because the electrical discharge voltage
becomes 20kV or more.

It might cause to damage the ignition coil if the gap of more than 17 mm is taken.

NOTE:
When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.

OK or NG

OK

>> GO TO 10.

NG

>> GO TO 7.

7. 

CHECK FUNCTION OF IGNITION COIL-II

1.

Turn ignition switch OFF.

2.

Disconnect spark plug and connect a known-good spark plug.

3.

Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded metal portion.

OK or NG

OK

>> GO TO 8.

NG

>> Check ignition coil, power transistor and their circuits. Refer to 

EC-731

 .

Spark should be generated.

PBIB0041E

PBIB2325E

Spark should be generated.

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

FIRE

EC-361

C

D

E

F

G

H

I

J

K

L

M

A

EC

8. 

CHECK SPARK PLUG

Check the initial spark plug for fouling, etc.

OK or NG

OK

>> Replace spark plug(s) with standard type one(s). For

spark plug type, refer to 

EM-30

 .

NG

>> 1. Repair or clean spark plug.

2. GO TO 9.

9. 

CHECK FUNCTION OF IGNITION COIL-III

1.

Reconnect the initial spark plugs.

2.

Crank engine for about three seconds, and recheck whether spark is generated between the spark plug
and the grounded portion.

OK or NG

OK

>> INSPECTION END

NG

>> Replace spark plug(s) with standard type one(s). For spark plug type, refer to 

EM-30

 .

10. 

CHECK COMPRESSION PRESSURE

Check compression pressure. Refer to 

EM-67, "CHECKING COMPRESSION PRESSURE"

 ,.

OK or NG

OK

>> GO TO 11.

NG

>> Check pistons, piston rings, valves, valve seats and cylinder head gaskets.

11. 

CHECK FUEL PRESSURE

1.

Install all removed parts.

2.

Release fuel pressure to zero. Refer to 

EC-80, "FUEL PRESSURE RELEASE"

 .

3.

Install fuel pressure gauge and check fuel pressure. Refer to 

EC-80, "FUEL PRESSURE CHECK"

 .

OK or NG

OK

>> GO TO 13.

NG

>> GO TO 12.

12. 

DETECT MALFUNCTIONING PART

Check the following.

Fuel pump and circuit (Refer to 

EC-534, "DTC P1220 FUEL PUMP CONTROL MODULE (FPCM)"

 , 

EC-

715, "FUEL PUMP"

 .)

Fuel pressure regulator (Refer to 

EC-80

 .)

Fuel lines (Refer to 

MA-15, "Checking Fuel Lines"

 .)

Fuel filter for clogging

>> Repair or replace.

SEF156I

Spark should be generated.

At idle:

Approx. 350 kPa (3.57 kg/cm

2

 , 51 psi)

EC-362

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

FIRE

13. 

CHECK IGNITION TIMING

Check the following items. Refer to 

EC-71, "Basic Inspection"

 .

OK or NG

OK

>> GO TO 14.

NG

>> Follow the Basic Inspection.

Items

Specifications

Target idle speed

650 

±

 50 rpm (in P or N position)

Ignition timing

12 

±

 5

°

 BTDC (in P or N position)

 

 

 

 

 

 

 

Content   ..  428  429  430  431   ..