Infiniti QX56 (Z62). Manual - part 508

 

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Infiniti QX56 (Z62). Manual - part 508

 

 

EC-10

< PRECAUTION >

[VK56VD]

PRECAUTIONS

CAUTION:

Comply with the following cautions to prevent any error and malfunction.
• Install the xenon bulb securely. (Insufficient bulb socket installation may melt the bulb, the connec-

tor, the housing, etc. by high-voltage leakage or corona discharge.)

• Never perform HID circuit inspection with a tester.
• Never touch the xenon bulb glass with hands. Never put oil and grease on it.
• Dispose of the used xenon bulb after packing it in thick vinyl without breaking it. 
• Never wipe out dirt and contamination with organic solvent (thinner, gasoline, etc.).

On Board Diagnostic (OBD) System of Engine and A/T

INFOID:0000000006217652

The ECM has an on board diagnostic system. It will illuminate the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.

CAUTION:

• Always turn the ignition switch OFF and disconnect the negative battery cable before any repair or

inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will cause
the MIL to illuminate.

• Always connect and lock the connectors securely after work. A loose (unlocked) connector will

cause the MIL to illuminate due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)

• Certain systems and components, especially those related to OBD, may use a new style slide-lock-

ing type harness connector. For description and how to disconnect, refer to 

EC-51, "Diagnosis

Description"

.

• Always route and secure the harnesses properly after work. The interference of the harness with a

bracket, etc. may cause the MIL to illuminate due to the short circuit.

• Always connect rubber tubes properly after work. A misconnected or disconnected rubber tube may

cause the MIL to illuminate due to the malfunction of the EVAP system or fuel injection system, etc.

• Always erase the unnecessary malfunction information (repairs completed) from the ECM and TCM

(Transmission control module) before returning the vehicle to the customer.

General Precautions

INFOID:0000000006217653

• Always use a 12 volt battery as power source.
• Never 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 bat-
tery 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 dis-

connect battery ground cable.

• Never 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. Thus,
engine operation can vary slightly in this case. However, this
is not an indication of a malfunction. Never 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

SEF289H

JMBIA0057ZZ

PRECAUTIONS

EC-11

< PRECAUTION >

[VK56VD]

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• When connecting ECM harness connector (A), fasten (B) it

securely with a lever as far as it will go as shown in the figure.

- ECM  (1)
- Loosen (C)

• When connecting or disconnecting pin connectors into or

from ECM, never damage pin terminals (bends or break).
Check that there are not any bends or breaks on ECM pin ter-
minal, when connecting pin connectors.

• Securely connect ECM harness connectors.

A poor connection can cause an extremely high (surge) volt-
age to develop in coil and condenser, thus resulting in dam-
age to ICs.

• Keep engine control system harness at least 10 cm (4 in) away

from adjacent harness, to prevent engine control system mal-
functions due to receiving external noise, degraded operation
of ICs, etc.

• Keep engine control system parts and harness dry.
• Before replacing ECM, perform ECM Terminals and Reference

Value inspection and check that ECM functions properly.
Refer to 

EC-72, "Reference Value"

.

• Handle mass air flow sensor carefully to avoid damage.
• Never clean mass air flow sensor with any type of detergent.
• Never disassemble electric throttle control actuator.
• Even a slight leakage in the air intake system can cause seri-

ous incidents.

• Never shock or jar the camshaft position sensor, crankshaft

position sensor.

• After performing each TROUBLE DIAGNOSIS, perform DTC

Confirmation Procedure or Component Function Check.
The DTC should not be displayed in the DTC Confirmation
Procedure if the repair is completed. The Component Func-
tion Check should be a good result if the repair is completed.

JMBIA0029ZZ

PBIB0090E

MEF040D

SEF217U

EC-12

< PRECAUTION >

[VK56VD]

PRECAUTIONS

• 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.

• B1 indicates bank 1, B2 indicates bank 2 as shown in the fig-

ure.

• Never operate fuel pump when there is no fuel in lines.
• Tighten fuel hose clamps to the specified torque.

• Never depress accelerator pedal when starting.
• Immediately after starting, never rev up engine unnecessarily.
• Never rev up engine just prior to shutdown.

SEF348N

PBIB1144E

SEF709Y

PRECAUTIONS

EC-13

< PRECAUTION >

[VK56VD]

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• When installing C.B. ham radio or a mobile phone, be sure to

observe the following as it may adversely affect electronic
control systems depending on installation location.

Keep the antenna as far as possible from the electronic con-

trol units.

Keep the antenna feeder line more than 20 cm (8 in) away

from the harness of electronic controls.
Never let them run parallel for a long distance.

Adjust the antenna and feeder line so that the standing-wave

ratio can be kept smaller.

Be sure to ground the radio to vehicle body.

SEF708Y

 

 

 

 

 

 

 

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