2005 NISSAN NAVARA Repair Workshop Manual

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NISSAN NAVARA 2005 Repair Workshop Manual SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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Cold or Hot Start Up
On some occasions an electrical incident may occur only when the car is started cold, or it may occur w

SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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Cold or Hot Start Up
On some occasions an electrical incident may occur only when the car is started cold, or it may occur when
the car is restarted hot shortly after being turned off. In these cases you may have to keep the car overnight to
make a proper diagnosis.
CIRCUIT INSPECTION
Introduction
In general, testing electrical circuits is an easy task if it is approached in a logical and organized method.
Before beginning it is important to have all available information on the system to be tested. Also, get a thor-
ough understanding of system operation. Then you will be able to use the appropriate equipment and follow
the correct test procedure.
You may have to simulate vehicle vibrations while testing electrical components. Gently shake the wiring har-
ness or electrical component to do this.
NOTE:
Refer to “How to Check Terminal” to probe or check terminal.
Testing for “Opens” in the Circuit
Before you begin to diagnose and test the system, you should rough sketch a schematic of the system. This
will help you to logically walk through the diagnosis process. Drawing the sketch will also reinforce your work-
ing knowledge of the system.
CONTINUITY CHECK METHOD
The continuity check is used to find an open in the circuit. The digital multimeter (DMM) set on the resistance
function will indicate an open circuit as over limit (no beep tone or no ohms symbol). Make sure to always start
with the DMM at the highest resistance level.
To help in understanding the diagnosis of open circuits, please refer to the previous schematic.
lDisconnect the battery negative cable.
lStart at one end of the circuit and work your way to the other end. (At the fuse block in this example)
lConnect one probe of the DMM to the fuse block terminal on the load side.
lConnect the other probe to the fuse block (power) side of SW1. Little or no resistance will indicate that
portion of the circuit has good continuity. If there were an open in the circuit, the DMM would indicate an
over limit or infinite resistance condition. (point A)
lConnect the probes between SW1 and the relay. Little or no resistance will indicate that portion of the cir-
cuit has good continuity. If there were an open in the circuit, the DMM would indicate an over limit or infi-
nite resistance condition. (point B)
lConnect the probes between the relay and the solenoid. Little or no resistance will indicate that portion of
the circuit has good continuity. If there were an open in the circuit, the DMM would indicate an over limit or
infinite resistance condition. (point C)
Any circuit can be diagnosed using the approach in the previous example.
OPEN A circuit is open when there is no continuity through a section of the circuit.
SHORTThere are two types of shorts.
lSHORT CIRCUITWhen a circuit contacts another circuit and causes the normal resistance to
change.
lSHORT TO GROUND When a circuit contacts a ground source and grounds the circuit.
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NISSAN NAVARA 2005 Repair Workshop Manual GI-28
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
VOLTAGE CHECK METHOD
To help in understanding the diagnosis of open circuits please refer to the previous schematic.
In any powered circuit, an open c

GI-28
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
VOLTAGE CHECK METHOD
To help in understanding the diagnosis of open circuits please refer to the previous schematic.
In any powered circuit, an open can be found by methodically checking the system for the presence of voltage.
This is done by switching the DMM to the voltage function.
lConnect one probe of the DMM to a known good ground.
lBegin probing at one end of the circuit and work your way to the other end.
lWith SW1 open, probe at SW1 to check for voltage.
voltage; open is further down the circuit than SW1.
no voltage; open is between fuse block and SW1 (point A).
lClose SW1 and probe at relay.
voltage; open is further down the circuit than the relay.
no voltage; open is between SW1 and relay (point B).
lClose the relay and probe at the solenoid.
voltage; open is further down the circuit than the solenoid.
no voltage; open is between relay and solenoid (point C).
Any powered circuit can be diagnosed using the approach in the previous example.
Testing for “Shorts” in the Circuit
To simplify the discussion of shorts in the system, please refer to the following schematic.
RESISTANCE CHECK METHOD
lDisconnect the battery negative cable and remove the blown fuse.
lDisconnect all loads (SW1 open, relay disconnected and solenoid disconnected) powered through the
fuse.
lConnect one probe of the DMM to the load side of the fuse terminal. Connect the other probe to a known
good ground.
lWith SW1 open, check for continuity.
continuity; short is between fuse terminal and SW1 (point A).
no continuity; short is further down the circuit than SW1.
lClose SW1 and disconnect the relay. Put probes at the load side of fuse terminal and a known good
ground. Then, check for continuity.
continuity; short is between SW1 and the relay (point B).
no continuity; short is further down the circuit than the relay.
lClose SW1 and jump the relay contacts with jumper wire. Put probes at the load side of fuse terminal and
a known good ground. Then, check for continuity.
continuity; short is between relay and solenoid (point C).
no continuity; check solenoid, retrace steps.
VOLTAGE CHECK METHOD
lRemove the blown fuse and disconnect all loads (i.e. SW1 open, relay disconnected and solenoid discon-
nected) powered through the fuse.
lTurn the ignition key to the ON or START position. Verify battery voltage at the battery + side of the fuse
terminal (one lead on the battery + terminal side of the fuse block and one lead on a known good ground).
lWith SW1 open and the DMM leads across both fuse terminals, check for voltage.
voltage; short is between fuse block and SW1 (point A).
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NISSAN NAVARA 2005 Repair Workshop Manual SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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no voltage; short is further down the circuit than SW1.
lWith SW1 closed, relay and solenoid disconnected and the DMM leads

SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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no voltage; short is further down the circuit than SW1.
lWith SW1 closed, relay and solenoid disconnected and the DMM leads across both fuse terminals, check
for voltage.
voltage; short is between SW1 and the relay (point B).
no voltage; short is further down the circuit than the relay.
lWith SW1 closed, relay contacts jumped with fused jumper wire check for voltage.
voltage; short is down the circuit of the relay or between the relay and the disconnected solenoid (point C).
no voltage; retrace steps and check power to fuse block.
Ground Inspection
Ground connections are very important to the proper operation of electrical and electronic circuits. Ground
connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can
become an unwanted resistance. This unwanted resistance can change the way a circuit works.
Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drasti-
cally affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even
when the ground connection looks clean, there can be a thin film of rust on the surface.
When inspecting a ground connection follow these rules:
lRemove the ground bolt or screw.
lInspect all mating surfaces for tarnish, dirt, rust, etc.
lClean as required to assure good contact.
lReinstall bolt or screw securely.
lInspect for “add-on” accessories which may be interfering with the ground circuit.
lIf several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the
wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one
eyelet make sure no ground wires have excess wire insulation.
For detailed ground distribution information, refer to “Ground Distribution” in PG section.
Voltage Drop Tests
Voltage drop tests are often used to find components or circuits which have excessive resistance. A voltage
drop in a circuit is caused by a resistance when the circuit is in operation.
Check the wire in the illustration. When measuring resistance with DMM, contact by a single strand of wire will
give reading of 0 ohms. This would indicate a good circuit. When the circuit operates, this single strand of wire
is not able to carry the current. The single strand will have a high resistance to the current. This will be picked
up as a slight voltage drop.
Unwanted resistance can be caused by many situations as follows:
lUndersized wiring (single strand example)
lCorrosion on switch contacts
lLoose wire connections or splices.
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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
If repairs are needed always use wire that is of the same or larger gauge.
MEASURING VOLTAGE DROP — ACCUMULATED METHOD
lConnect the DMM across the c

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NISSAN NAVARA 2005 Repair Workshop Manual SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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Control Unit Circuit Test
System Description:When the switch is ON, the control unit lights up the lamp.
INPUT-OUTPUT VOLTAG

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NISSAN NAVARA 2005 Repair Workshop Manual GI-32
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
Control Units and Electrical Parts
EAS001H1
PRECAUTIONS
lNever reverse polarity of battery terminals.
lInstall only parts specified for a vehicle.
lBe

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lDo not apply excessive shock to the control unit by dropping or
hitting it.
lBe careful to prevent condensation in the cont

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NISSAN NAVARA 2005 Repair Workshop Manual GI-34
CONTROL UNIT CONFIGURATION PROCEDURE
CONTROL UNIT CONFIGURATION PROCEDURE
PFP:00000
DescriptionEAS001HD
Perform configuration and other appurtenant work in accordance with the procedures in the

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