Infiniti Q45 (FY33). Manual - part 128

SEF553T

I

Method B (Using check connector)

Check the idle speed using check connector as shown in the fig-
ure. (Check connector is located in the harness protector).

SEF295T

IGNITION TIMING

Any of the following two methods may be used.

I

Method A

1.

Attach timing light to loop wire as shown.

2.

Check ignition timing.

SEF296T

I

Method B

1.

Remove intake air duct.

2.

Remove No. 1 ignition coil.

SEF297T

3.

Connect No. 1 ignition coil and No. 1 spark plug with suitable
high-tension wire as shown, and attach timing light clamp to
this wire.

4.

Install air duct.

5.

Check ignition timing.

SEF011V

GI

MA

EM

LC

FE

AT

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

BASIC SERVICE PROCEDURE

Direct Ignition System — How to Check Idle
Speed and Ignition Timing (Cont’d)

EC-41

Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment

PREPARATION

I

Make sure that the following parts are in
good order.

(1)

Battery

(2)

Ignition system

(3)

Engine oil and coolant levels

(4)

Fuses

(5)

ECM harness connector

(6)

Vacuum hoses

(7)

Air intake system
(Oil filler cap, oil level gauge, etc.)

(8)

Fuel pressure

(9)

Engine compression

(10) EGR valve operation
(11) Throttle valve
(12) EVAP system

I

On air conditioner equipped models, checks
should be carried out while the air condi-
tioner is “OFF”.

I

When checking idle speed, ignition timing
and mixture ratio of A/T models, shift lever to
“N” position.

I

When measuring “CO” percentage, insert
probe more than 40 cm (15.7 in) into tail pipe.

I

Turn off headlamps, heater blower, rear win-
dow defogger.

I

Keep front wheels pointed straight ahead.

I

Make the check after the cooling fan has
stopped.

Overall inspection sequence

INSPECTION START

Perform diagnostic test mode II (Self-diagnostic results).

OK

E

NG

Repair or replace.

H

Check & adjust ignition timing.

OK

G

NG

Check & adjust idle
speed.

H

OK

F

Check function of heated
oxygen sensors 1 (front).

OK

E

NG

Check harnesses of
heated oxygen sensors 1
(front).

NG

E

OK

Check CO%.

OK

H

E

NG

Check emission control
parts and repair or
replace if necessary.

F

Repair or replace har-
ness(es).

I

Replace heated oxygen
sensor 1 (front).

I

Check function of
heated oxygen sensor
1 (front).

E

NG

INSPECTION END

F

OK

BASIC SERVICE PROCEDURE

H

H

H

H

H

EC-42

SEF246F

SEF247F

SEF217U

SEF248F

SEF212U

START

Visually check the following:

I

Air cleaner clogging

I

Hoses and ducts for leaks

I

EGR valve operation

I

Electrical connectors

I

Gasket

I

Throttle position

Start engine and warm it up until engine coolant temperature
indicator points to the middle of gauge and ensure that engine
speed is below 1,000 rpm.

Open engine hood and run engine at about 2,000 rpm for
about 2 minutes under no-load.

Perform diagnostic test mode II (Self-diagnostic results).

OK

NG

Repair or replace components as necessary.

H

Does engine run smoothly?

OK

NG

F

Clean injectors.

Race engine two or three times under no-load, then run
engine at idle speed.

F

q

B

1. Turn off engine and disconnect

throttle position sensor harness con-
nector.

2. Start engine.

Check ignition timing with a timing light.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

15°±2° BTDC (in “N” position)

OK

NG

Adjust ignition timing by turning camshaft
position sensor after loosening securing bolts
which secures camshaft position sensor.

q

A

Connect throttle position sensor harness
connector.

E

q

B

GI

MA

EM

LC

FE

AT

PD

FA

RA

BR

ST

RS

BT

HA

EL

IDX

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment (Cont’d)

H

H

H

H

H

H

H

H

H

H

H

H

H

EC-43

SEF043T

SEF392X

SEF212U

SEF115T

SEF247F

q

A

Connect throttle position sensor harness connector.

Check target idle speed.

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Read idle speed in “DATA MONITOR” mode with CONSULT-II

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- OR ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Check idle speed.

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

650±50 rpm (in “N” position)

OK

NG

Disconnect throttle position sensor harness connector.

Adjust base idle speed by turning idle speed adjusting screw.

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

600±25 rpm (in “N” position)

1) Connect throttle position sensor harness connector.
2) Erase diagnostic trouble code, EC-67.

Run engine at about 2,000 rpm for
about 2 minutes under no-load.

F

q

H

q

B

q

D

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio
Adjustment (Cont’d)

H

H

H

H

H

H

H

H

EC-44