Nissan Frontier D40. Manual - part 705

 

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Nissan Frontier D40. Manual - part 705

 

 

GI-44

< BASIC INSPECTION >

SERVICE INFORMATION FOR ELECTRICAL INCIDENT

HOW TO PROBE CONNECTORS

• Connector damage and an intermittent connection can result from improperly probing of the connector dur-

ing circuit checks.

• The probe of a digital multimeter (DMM) may not correctly fit the connector cavity. To correctly probe the

connector, follow the procedures below using a “T” pin. For the best contact grasp the “T” pin using an alliga-
tor clip.

Probing from Harness Side 

Standard type (not waterproof type) connector should be probed
from harness side with “T” pin.
• If the connector has a rear cover such as a ECM connector,

remove the rear cover before probing the terminal.

• Do not probe waterproof connector from harness side. Damage to

the seal between wire and connector may result.

Probing from Terminal Side 

FEMALE TERMINAL

• There is a small notch above each female terminal. Probe each

terminal with the “T” pin through the notch.
Do not insert any object other than the same type male terminal
into female terminal.

Tool number

(Kent-Moore No.)

Tool name

Description

-
(J38751-95NI)
Connector and terminal 
pin kit (NISSAN)
-
(J38751-95INF)
Connector and terminal 
pin kit (INFINITI) 
-
(J42992-98KIT)
OBD and terminal repair 
kit
-
(J42992-2000UPD)
OBD-II Connector Kit Up-
date

WAIA0004E

WAIA0005E

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SERVICE INFORMATION FOR ELECTRICAL INCIDENT

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• Some connectors do not have a notch above each terminal. To

probe each terminal, remove the connector retainer to make con-
tact space for probing.

MALE TERMINAL

• Carefully probe the contact surface of each terminal using a “T”

pin.

CAUTION:

Dot not bend terminal.

How to Check Enlarged Contact Spring of Terminal

• An enlarged contact spring of a terminal may create intermittent signals in the circuit.
• If the intermittent open circuit occurs, follow the procedure below to inspect for open wires and enlarged con-

tact spring of female terminal.

1.

Assemble a male terminal and approx. 10 cm (3.9 in) of wire.
NOTE:
Use a male terminal which matches the female terminal.

2.

Disconnect the suspected faulty connector and hold it terminal
side up.

3.

While holding the wire of the male terminal, try to insert the male
terminal into the female terminal.

CAUTION:

Do not force the male terminal into the female terminal with
your hands.

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GI-46

< BASIC INSPECTION >

SERVICE INFORMATION FOR ELECTRICAL INCIDENT

4.

While moving the connector, check whether the male terminal
can be easily inserted or not.

• If the male terminal can be easily inserted into the female ter-

minal, replace the female terminal.

Waterproof Connector Inspection 

If water enters the connector, it can short interior circuits. This may lead to intermittent problems.
Check the following items to maintain the original waterproof characteristics.

RUBBER SEAL INSPECTION

• Most waterproof connectors are provided with a rubber seal

between the male and female connectors. If the seal is missing,
the waterproof performance may not meet specifications.

• The rubber seal may come off when connectors are disconnected.

Whenever connectors are reconnected, make sure the rubber seal
is properly installed on either side of male or female connector.

WIRE SEAL INSPECTION

• The wire seal must be installed on the wire insertion area of a

waterproof connector. Be sure that the seal is installed properly.

Terminal Lock Inspection 

Check for unlocked terminals by pulling wire at the end of connector.
An unlocked terminal may create intermittent signals in the circuit.

Intermittent Incident

INFOID:0000000005273008

DESCRIPTION

Sometimes the symptom is not present when the vehicle is brought in for service. If possible, re-create the
conditions present at the time of the incident. Doing so may help avoid a No Trouble Found Diagnosis. The fol-

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SERVICE INFORMATION FOR ELECTRICAL INCIDENT

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lowing section illustrates ways to simulate the conditions/environment under which the owner experiences an
electrical incident.

The section is broken into the six following topics:

• Vehicle vibration
• Heat sensitive
• Freezing
• Water intrusion
• Electrical load
• Cold or hot start up
Get a thorough description of the incident from the customer. It is important for simulating the conditions of the
problem.

VEHICLE VIBRATION

The problem may occur or become worse while driving on a rough road or when engine is vibrating (idle with
A/C on). In such a case, you will want to check for a vibration related condition. Refer to the following illustra-
tion.

Connector & Harness

Determine which connectors and wiring harness would affect the electrical system you are inspecting. Gently
shake each connector and harness while monitoring the system for the incident you are trying to duplicate.
This test may indicate a loose or poor electrical connection.

Hint

Connectors can be exposed to moisture. It is possible to get a thin film of corrosion on the connector termi-
nals. A visual inspection may not reveal this without disconnecting the connector. If the problem occurs inter-
mittently, perhaps the problem is caused by corrosion. It is a good idea to disconnect, inspect and clean the
terminals on related connectors in the system.

Sensor & Relay

Gently apply a slight vibration to sensors and relays in the system you are inspecting.
This test may indicate a loose or poorly mounted sensor or relay.

Engine Compartment

There are several reasons a vehicle or engine vibration could cause an electrical complaint. Some of the
things to check for are:
• Connectors not fully seated.
• Wiring harness not long enough and is being stressed due to engine vibrations or rocking.
• Wires laying across brackets or moving components.
• Loose, dirty or corroded ground wires.
• Wires routed too close to hot components.
To inspect components under the hood, start by verifying the integrity of ground connections. (Refer to Ground
Inspection described later.) First check that the system is properly grounded. Then check for loose connection
by gently shaking the wiring or components as previously explained. Using the wiring diagrams inspect the
wiring for continuity.

Behind the Instrument Panel

An improperly routed or improperly clamped harness can become pinched during accessory installation. Vehi-
cle vibration can aggravate a harness which is routed along a bracket or near a screw.

Under Seating Areas

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