2003 NISSAN X-TRAIL Electronic Repair Manual

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Page 2281 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual GI-28
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
Any circuit can be diagnosed using the approach in the previous example.
VOLTAGE CHECK METHOD
To help in understanding the diagnosis of open circuits

GI-28
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
Any circuit can be diagnosed using the approach in the previous example.
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).
SGI847-A

Page 2282 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual SERVICE INFORMATION FOR ELECTRICAL INCIDENT
GI-29
lWith SW1 open and the DMM leads across both fuse terminals, check for voltage.
voltage; short is between fuse block and SW1 (point A).
no voltage; sh

SERVICE INFORMATION FOR ELECTRICAL INCIDENT
GI-29
lWith SW1 open and the DMM leads across both fuse terminals, check for voltage.
voltage; short is between fuse block and SW1 (point A).
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:
lRemovethegroundboltorscrew.
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)
SGI853

Page 2283 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual GI-30
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
lCorrosion on switch contacts
lLoose wire connections or splices.
If repairs are needed always use wire that is of the same or larger gauge.
MEASURING

Page 2284 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual SERVICE INFORMATION FOR ELECTRICAL INCIDENT
GI-31
The step by step voltage drop test can identify a component or wire with too much resistance.
Control Unit Circuit Test
System Description:When the sw

Page 2285 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual GI-32
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
INPUT-OUTPUT VOLTAGE CHART
The voltage value is based on the body ground.
*:If high resistance exists in the switch side circuit (caused by a single s

Page 2286 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual SERVICE INFORMATION FOR ELECTRICAL INCIDENT
GI-33
lFor removal of the lever type connector, pull the lever up to the
direction pointed to by the arrow A in the figure, and then
remove the connector.
l

Page 2287 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual GI-34
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
lWhen using a DMM, be careful not to let test probes get close to
each other to prevent the power transistor in the control unit
from damaging battery

Page 2288 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual CONSULT-II CHECKING SYSTEM
GI-35
CONSULT-II CHECKING SYSTEMPFP:00000
DescriptionEAS000G8
lCONSULT-II is a hand-held type tester. When it is connected with a diagnostic connector equipped on the
vehicl

CONSULT-II CHECKING SYSTEM
GI-35
CONSULT-II CHECKING SYSTEMPFP:00000
DescriptionEAS000G8
lCONSULT-II is a hand-held type tester. When it is connected with a diagnostic connector equipped on the
vehicle side, it will communicate with the control unit equipped in the vehicle and then enable various
kinds of diagnostic tests.
lRefer to “CONSULT-II Software Operation Manual” for more information.
Function and System ApplicationEAS000G9
x:Applicable
*1: Nissan Anti-Theft System
Nickel Metal Hydride Battery ReplacementEAS000GA
CONSULT-II contains a nickel metal hydride battery. When replacing the battery obey the following:
WA RN ING:
Replace the nickel metal hydride battery with Genuine CONSULT-II battery only. Use of another bat-
tery may present a risk of fire or explosion. The battery may present a fire or chemical burn hazard if
mistreated. Do not recharge, disassemble or dispose of in fire.
Keep the battery out of reach of children and discard used battery conforming to the local regulations.
Checking EquipmentEAS000GB
When ordering the following equipment, contact your NISSAN/INFINITI distributor.
Diagnostic test
modeFunction
ENGINE
A/T
AIR BAG
ESP (Including ABS)
ALL MODE 4WD
NATS*1
Work supportThis mode enables a technician to adjust some devices faster and more accu-
rately by following the indications on CONSULT-II.x- -x- -
Self-diagnostic
resultsSelf-diagnostic results can be read and erased quickly. x x x x x x
Trouble diagnos-
tic recordCurrent self-diagnostic results and all trouble diagnostic records previously stored
can be read.--x- - -
Data monitor Input/Output data in the ECM can be read. x x - x x -
Active testDiagnostic Test Mode in which CONSULT-II drives some actuators apart from the
ECMs and also shifts some parameters in a specified range.x- -x- -
DTC confirmationThe results of SRT (System Readiness Test) and the self-diagnosis status/result
can be confirmed.x- -- - -
DTC work sup-
portSelect the operating condition to confirm Diagnosis Trouble Codes. - x - - - -
ECM part number ECM part number can be read. x x - x x -
ECU discrimi-
nated No.Classification number of a replacement ECU can be read to prevent an incorrect
ECU from being installed.--x- - -
Function testConducted by CONSULT-II instead of a technician to determine whether each
system is “OK” or “NG”.xxxx - -
Control unit initial-
izationAll registered ignition key IDs in NATS components can be initialized and new IDs
can be registered.---- - x
Self-function
checkECM checks its own NATS communication interface. - - - - - x

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