1998 NISSAN PICK-UP Repair Manual

CONNECTOR SYMBOLS
Most of connector symbols in wiring diagrams are shown from
the terminal side.
lConnector symbols shown from the terminal side are
enclosed by a single line and followed by the direction mark
.
lConnector symbols shown from the harness side are
enclosed by a double line and followed by the direction mark
.
lMale and female terminals
Connector guides for male terminals are shown in black and
female terminals in white in wiring diagrams.
SGI364
SGI363
HOW TO READ WIRING DIAGRAMS
Description (Cont'd)
GI-13

Harness indication
lLetter designations next to test meter probe indicate harness
(connector) wire color.
lConnector numbers in a single circleM33indicate harness
connectors.
Component indication
lConnector numbers in a double circleF211indicate compo-
nent connectors.
SWITCH POSITIONS
Switches are shown in wiring diagrams as if the vehicle is in the
``normal'' condition.
A vehicle is in the ``normal'' condition when:
lignition switch is ``OFF'',
ldoors, hood and trunk lid/back door are closed,
lpedals are not depressed, and
lparking brake is released.
AGI070
SGI860
HOW TO READ WIRING DIAGRAMS
Description (Cont'd)
GI-14

DETECTABLE LINES AND NON-DETECTABLE LINES
In some wiring diagrams, two kinds of lines, representing wires,
with different weight are used.
lA line with regular weight (wider line) represents a ``detect-
able line for DTC (Diagnostic Trouble Code)''. A ``detectable
line for DTC'' is a circuit in which ECM (Engine Control Mod-
ule) can detect its malfunctions with the on board diagnostic
system.
lA line with less weight (thinner line) represents a ``non-de-
tectable line for DTC''. A ``non-detectable line for DTC'' is a
circuit in which ECM cannot detect its malfunctions with the
on-board diagnostic system.
SGI862-A
HOW TO READ WIRING DIAGRAMS
Description (Cont'd)
GI-15

MULTIPLE SWITCH
The continuity of multiple switch is described in two ways as
shown below.
lThe switch chart is used in schematic diagrams.
lThe switch diagram is used in wiring diagrams.
SGI875
HOW TO READ WIRING DIAGRAMS
Description (Cont'd)
GI-16

FOLDOUT PAGE
The foldout page should be opened when reading wiring diagram.
Super multiple junction (SMJ)
In wiring diagram, connectors consisting of terminals having terminal numbers with an alphabet (1B, 0D, etc.)
are SMJ connectors.
If connector numbers are shown in Reference Area, these connector symbols are not shown in Connector
Area. For terminal arrangement of these connectors, refer to the foldout page at the end of this manual.
Joint connector
Joint connector symbols are shown in Connector Area in the wiring diagram concerned. Foldout page also
carries inside wiring layout together with such joint connector symbols.
SGI943
HOW TO READ WIRING DIAGRAMS
Description (Cont'd)
GI-17

How to Probe Connectors
Connector damage and an intermittent connection can result
from improperly probing of the connector during 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 alligator clip.
PROBING FROM HARNESS SIDE
Standard type (not waterproof type) connector should be probed
from harness side with ``T'' pin.
lIf the connector has a rear cover such as a ECM
connector, remove the rear cover before probing the ter-
minal.
lDo not probe waterproof connector from harness side.
Damage to the seal between wire and connector may
result.
PROBING FROM TERMINAL SIDE
Female terminal
lThere 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 ter-
minal into female terminal.
lSome connectors do not have a notch above each terminal.
To probe each terminal, remove the connector retainer to
make contact space for probing.
Male terminal
Carefully probe the contact surface of each terminal using a ``T''
pin.
Do not bend terminal.
SGI841
SEL265V
SEL266V
SEL267V
HOW TO CHECK TERMINAL
GI-18

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 contact spring of female
terminal.
1. Assemble a male terminal and approx. 10 cm (3.9 in) of wire.
Use a male terminal which matches the female terminal.
2. Disconnect the suspected faulty connector and hold it termi-
nal side up.
3. While holding the wire of the male terminal, try to insert the
male terminal into the female terminal.
Do not force the male terminal into the female terminal with
your hands.
4. While moving the connector, check whether the male termi-
nal can be easily inserted or not.
lIf the male terminal can be easily inserted into the female
terminal, replace the female terminal.
SEL270V
SEL271V
SEL272V
SEL273V
HOW TO CHECK TERMINAL
GI-19

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
lMost 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 specifi-
cations.
lThe rubber seal may come off when connectors are discon-
nected. 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 con-
nector. An unlocked terminal may create intermittent signals in
the circuit.
SEL275V
SEL330V
HOW TO CHECK TERMINAL
GI-20