1999 NISSAN PRIMERA Electronic Repair Manual

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Page 1817 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 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

Page 1818 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 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
cha

Page 1819 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Work Flow
STEP DESCRIPTION
STEP 1 Get detailed information about the conditions and the environment when the incident occurred.
The following are key pieces of information required to make a good anal

Page 1820 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Incident Simulation Tests
INTRODUCTION
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

Page 1821 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Tester probe
When probing a connector it is possible to enlarge the contact
spring opening. If this occurs it may create an intermittent signal
in the circuit. When probing a connector, use care not t

Page 1822 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Engine compartment
There are several reasons a vehicle or engine vibration could
cause an electrical complaint. Some of the things to check for
are:
lConnectors not fully seated.
lWiring harness not l

Page 1823 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual FREEZING
The customer may indicate the incident goes away after the car
warms up (winter time). The cause could be related to water
freezing somewhere in the wiring/electrical system.
There are two me

Page 1824 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual 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 in

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
thorough 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 shakethe wiring
harness or electrical component to do this.
OPEN A circuit is open when there is no continuity through a section of the circuit.
SHORT There are two types of shorts.
lSHORT CIRCUITWhen a circuit contacts another circuit and causes the
normal resistance to change.
lSHORT TO GROUNDWhen a circuit contacts a ground source and grounds the
circuit.
TESTING FOR ªOPENSº 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
working 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 resis-
tance function will indicate an open circuit as over limit (OL, 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 schematic above.
1. Disconnect the battery negative cable.
2. Start at one end of the circuit and work your way to the other end. (At the fuse block in this example)
3. Connect one probe of the DMM to the fuse block terminal on the load side.
4. Connect 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)
5. Connect the probes between SW1 and the relay. 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 B)
6. Connect 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 above example.
SGI846
Inspection for opens
FUSE BLOCK
B+ SIDEDMM(Voltage check)
SW1N.C. RELAY
SOLENOID
OPEN
AOPEN
BOPEN
C
DMMDMM
SW2
(Continuity check)
HOW TO PERFORM EFFICIENT DIAGNOSIS
FOR AN ELECTRICAL INCIDENT
GI-29

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