Infiniti M35/M45 Y50. Manual - part 388

 

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Infiniti M35/M45 Y50. Manual - part 388

 

 

PRECAUTIONS

EC-25

[VQ35DE]

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Precaution

NBS004RZ

●

Always use a 12 volt battery as power source.

●

Do not attempt to disconnect battery cables while engine is
running.

●

Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect negative
battery cable. Failure to do so may damage the ECM
because battery voltage is applied to ECM even if ignition
switch is turned OFF.

●

Before removing parts, turn ignition switch OFF and then
disconnect negative battery cable.

●

Do not disassemble ECM.

●

If a battery cable is disconnected, the memory will return to
the ECM value.
The ECM will now start to self-control at its initial value.
Engine operation can vary slightly when the terminal is dis-
connected. However, this is not an indication of a malfunc-
tion. Do not replace parts because of a slight variation.

●

If the battery is disconnected, the following emission-
related diagnostic information will be lost within 24 hours.

–

Diagnostic trouble codes

–

1st trip diagnostic trouble codes

–

Freeze frame data

–

1st trip freeze frame data

–

System readiness test (SRT) codes

–

Test values

●

When connecting ECM harness connector, fasten (B) it
securely with a lever (2) as far as it will go as shown in the
figure.

–

ECM (1)

–

Loosen (A)

●

When connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM
pin terminal, when connecting pin connectors.

●

Securely connect ECM harness connectors.
A poor connection can cause an extremely high (surge)
voltage to develop in coil and condenser, thus resulting in
damage to ICs.

●

Keep engine control system harness at least 10 cm (4 in)
away from adjacent harness, to prevent engine control sys-
tem malfunctions due to receiving external noise, degraded
operation of ICs, etc.

●

Keep engine control system parts and harness dry.

SEF289H

PBIB1164E

PBIB2714E

PBIB0090E

EC-26

[VQ35DE]

PRECAUTIONS

●

Before replacing ECM, perform ECM Terminals and Refer-
ence Value inspection and make sure ECM functions prop-
erly. Refer to 

EC-114, "ECM Terminals and Reference Value"

.

●

Handle mass air flow sensor carefully to avoid damage.

●

Do not clean mass air flow sensor with any type of deter-
gent.

●

Do not disassemble electric throttle control actuator.

●

Even a slight leak in the air intake system can cause seri-
ous incidents.

●

Do not shock or jar the camshaft position sensor (PHASE),
crankshaft position sensor (POS).

●

After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check.
The DTC should not be displayed in the DTC Confirmation
Procedure if the repair is completed. The Overall Function
Check should be a good result if the repair is completed.

●

When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.

●

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

MEF040D

SEF217U

SEF348N

PRECAUTIONS

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B1 indicates the bank 1, B2 indicates the bank 2 as shown
in the figure.

●

Do not operate fuel pump when there is no fuel in lines.

–

Fuel level sensor unit and fuel pump (1)

–

Fuel pressure regulator (2)

–

Fuel tank temperature sensor (3)

●

Tighten fuel hose clamps to the specified torque.

●

Do not depress accelerator pedal when starting.

●

Immediately after starting, do not rev up engine unneces-
sarily.

●

Do not rev up engine just prior to shutdown.

●

When installing C.B. ham radio or a mobile phone, be sure
to observe the following as it may adversely affect elec-
tronic control systems depending on installation location.

–

Keep the antenna as far as possible from the electronic
control units.

–

Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Do not let them run parallel for a long distance.

–

Adjust the antenna and feeder line so that the standing-
wave radio can be kept smaller.

–

Be sure to ground the radio to vehicle body.

SEC893C

PBIB2707E

SEF709Y

SEF708Y

EC-28

[VQ35DE]

PREPARATION

PREPARATION

PFP:00002

Special Service Tools

NBS004S0

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number
(Kent-Moore No.)
Tool name

Description

EG17650301
(J-33984-A)
Radiator cap tester 
adapter

Adapting radiator cap tester to radiator cap and 
radiator filler neck
a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in)

KV10117100
(J-36471-A)
Heated oxygen 
sensor wrench

Loosening or tightening heated oxygen sensor 2 
with 22 mm (0.87 in) hexagon nut

(J-44626)
Air fuel ratio (A/F)
sensor wrench

Loosening tightening air fuel ratio (A/F) sensor 1

KV10114400
(J-38365)
Heated oxygen 
sensor wrench

Loosening or tightening air fuel ratio (A/F) sensor 
1
a: 22 mm (0.87 in)

(J-44321)
Fuel pressure gauge 
kit

Checking fuel pressure

KV109E0010
(J-46209)
Break-out box

Measuring the ECM signals with a circuit tester

KV109E0080
(J-45819)
Y-cable adapter

Measuring the ECM signals with a circuit tester

S-NT564

S-NT379

LEM054

S-NT636

LEC642

S-NT825

S-NT826

 

 

 

 

 

 

 

Content   ..  386  387  388  389   ..