Nissan Qashqai (2007-2010). Manual — part 208

PRECAUTIONS

EC-351

< PRECAUTION >

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

CAUTION:

• Be sure to 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 MI to light up.

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

cause the MI to light up 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

PG-105, "Description"

.

• Be sure to route and secure the harnesses properly after work. The interference of the harness with

a bracket, etc. may cause the MI to light up due to the short circuit.

• Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube

may cause the MI to light up due to the malfunction of the EVAP system or fuel injection system, etc.

• Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM before

returning the vehicle to the customer.

General Precautions

INFOID:0000000001056542

• 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 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.

• 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 (1), fasten (B) it

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

SEF289H

2.

ECM

A.

Loosen

PBIA9222J

PBIB2947E

EC-352

< PRECAUTION >

[HR16DE (WITH EURO-OBD)]

PRECAUTIONS

• 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) 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 make sure ECM functions properly.
Refer to

EC-318, "Reference Value"

.

• Handle mass air flow sensor carefully to avoid damage.
• Do not clean mass air flow sensor with any type of detergent.
• Do not disassemble electric throttle control actuator.
• Even a slight leak in the air intake system can cause serious

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

PBIB0090E

MEF040D

SAT652J

PRECAUTIONS

EC-353

< PRECAUTION >

[HR16DE (WITH EURO-OBD)]

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• 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/out-

put voltage. Doing so may result in damage to the ECM’s tran-
sistor. Use a ground other than ECM terminals, such as the
ground.

• Do not operate fuel pump when there is no fuel in lines.
• Tighten fuel hose clamps to the specified torque.

• Do not depress accelerator pedal when starting.
• Immediately after starting, do not rev up engine unnecessar-

ily.

• 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 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.
Do not 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.

SEF348N

SEF709Y

SEF708Y

EC-354

< PREPARATION >

[HR16DE (WITH EURO-OBD)]

PREPARATION

PREPARATION

PREPARATION

Special Service Tools

INFOID:0000000001056543

Commercial Service Tools

INFOID:0000000001056544

Tool number
Tool name

Description

KV10117100
Heated oxygen sensor
wrench

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

KV10114400
Heated oxygen sensor
wrench

Loosening or tightening heated oxygen sensor 2
a: 22 mm (0.87 in)

EG17550000
Break-out box

Measuring ECM signals with a circuit tester

EG17680000
Y-cable adapter

Measuring ECM signals with a circuit tester

KV10118400
Fuel tube adapter

Measuring fuel pressure

S-NT379

S-NT636

ZZA1194D

PBIA9379J

PBIB3043E