wiring NISSAN PATROL 1998 Y61 / 5.G Engine Control Workshop Manual

TROUBLEDIAGNOSISFOR``F/INJTIMGF/B''
(DTC21).......................................................................101
InjectionTimingControlValve.................................101
TROUBLEDIAGNOSISFOR``ACCELPOSSW
(F/C)''(DTC23) ...........................................................106
AcceleratorSwitch(F/C)..........................................106
TROUBLEDIAGNOSISFOR``ECM1''(DTC27),
``ECM2''(DTC31) .......................................................111
EngineControlModule(ECM)-ECCS-DControl
Module.....................................................................111
TROUBLEDIAGNOSISFOR``OVERHEAT''
(DTC28) .......................................................................113
CoolingFan(Overheat)...........................................113
TROUBLEDIAGNOSISFOR``I/CINT/ATEMP
SEN''(DTC33) ............................................................122
ChargeAirTemperatureSensor..............................122
TROUBLEDIAGNOSISFOR``NEEDLELIFT
SEN''(DTC34) ............................................................126
NeedleLiftSensor(NLS)........................................126
TROUBLE DIAGNOSIS FOR ``FUEL CUT S/V 1''
(DTC 36), ``FCV SHORT'' (DTC 37), ``FUEL CUT
S/V2''(DTC38) ...........................................................130
FuelCutSolenoidValve..........................................130
TROUBLE DIAGNOSIS FOR ``FUEL TEMP
SENSOR''(DTC42) ....................................................135
FuelTemperatureSensor(FTS)..............................135 TROUBLE DIAGNOSIS FOR ``ACCEL POS
SENSOR''(DTC43)
....................................................139
AcceleratorPositionSensor....................................139
TROUBLE DIAGNOSIS FOR ``CRANK POS SEN
(TDC)''(DTC47) ..........................................................144
CrankshaftPositionSensor(TDC)..........................144
TROUBLEDIAGNOSISFOR``GOVCUT
CIRCUIT''(DTC48) .....................................................149
GovernorCutCircuit................................................149
TROUBLEDIAGNOSESFORNON-DETECTABLE
ITEMS ........................................................................\
...151
GlowControlSystem...............................................151
EGRC-SolenoidValveA,BandThrottleControl
SolenoidValve.........................................................156
StartSignal..............................................................163
AcceleratorPositionSwitch.....................................165
Park/NeutralPositionSwitch...................................170
A/TControl...............................................................175
ChargeAirCoolerFanControl................................178
HeatUpSwitch........................................................183
AirConditionerControl............................................187
MIL&DataLinkConnectors...................................188
SERVICEDATAANDSPECIFICATIONS(SDS) ........189
GeneralSpeci®cations.............................................189
InjectionNozzle.......................................................189
InspectionandAdjustment......................................189
When you read wiring diagrams:
+ Read GI section, ``HOW TO READ WIRING DIAGRAMS''.
+ See EL section, ``POWER SUPPLY ROUTING'' for power distribution circuit.
When you perform trouble diagnoses, read GI section, ``HOW TO FOLLOW FLOW CHART IN
TROUBLE DIAGNOSES'' and ``HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL
INCIDENT''.

Supplemental Restraint System (SRS) ``AIR
BAG'' and ``SEAT BELT PRE-TENSIONER''
The Supplemental Restraint System such as ``AIR BAG'' and ``SEAT BELT PRE-TENSIONER'' used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger in a frontal collision.
The SRS system composition which is available to NISSAN MODEL Y61 is as follows (The composition var-
ies according to the destination.):
Driver air bag module (located in the center of the steering wheel), front passenger air bag module (located
on the instrument panel on passenger side), seat belt pre-tensioner, a diagnosis sensor unit, warning lamp,
wiring harness and spiral cable.
Information necessary to service the system safely is included in theRS sectionof this Service Manual.
WARNING:
+To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag in¯ation, all maintenance must be performed
by an authorized NISSAN dealer.
+Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the RS section.
+Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. Spiral cable and wiring harnesses covered with yellow insulation either just before
the harness connectors or for the complete harness are related to the SRS.
PRECAUTIONS AND PREPARATION
EC-4

Introduction
The engine has an ECM to control major systems such as fuel
injection control, fuel injection timing control, glow control system,
etc. The ECM accepts input signals from sensors and instantly
drives electronic fuel injection pump. It is essential that both input
and output signals are proper and stable. At the same time, it is
important that there are no problems such as vacuum leaks, or
other problems with the engine.
It is much more difficult to diagnose a problem that occurs intermit-
tently rather than continuously. Most intermittent problems are
caused by poor electric connections or improper wiring. In this
case, careful checking of suspected circuits may help prevent the
replacement of good parts.
A visual check only may not ®nd the cause of the problems. A road
test with CONSULT or a circuit tester connected should be per-
formed. Follow the ``Work Flow'', EC-44.
Before undertaking actual checks, take a few minutes to talk with
a customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such problems, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A ``Diagnostic Worksheet'' like the
example on next page should be used.
Start your diagnosis by looking for ``conventional'' problems ®rst.
This will help troubleshoot driveability problems on an electronically
controlled engine vehicle.
SEF858S
SEF233G
SEF234G
TROUBLE DIAGNOSIS Ð Introduction
EC-42

Description for Work Flow
STEP DESCRIPTION
STEP IGet detailed information about the conditions and the environment when the incident/symptom occurred using the
``DIAGNOSTIC WORKSHEET'' as shown on EC-43.
STEP IIBefore con®rming the concern, check and write down (print out using CONSULT) the Diagnostic Trouble Code
(DTC), then erase the code. Refer to EC-30.
Study the relationship between the cause, speci®ed by DTC, and the symptom described by the customer. (The
``Symptom Matrix Chart'' will be useful. Refer to EC-48.)
STEP IIITry to con®rm the symptom and under what conditions the incident occurs.
The ``DIAGNOSTIC WORK SHEET'' is useful to verify the incident. Connect CONSULT to the vehicle in DATA
MONITOR (AUTO TRIG) mode and check real time diagnosis results.
If the incident cannot be veri®ed, perform INCIDENT SIMULATION TESTS. Refer to GI section.
If the malfunction code is detected, skip STEP IV and perform STEP V.
STEP IVTry to detect the Diagnostic Trouble Code (DTC) by driving in (or performing) the ``DTC CONFIRMATION PROCE-
DURE''. Check and read the DTC by using CONSULT.
During the DTC veri®cation, be sure to connect CONSULT to the vehicle in DATA MONITOR (AUTO TRIG) mode
and check real time diagnosis results.
If the incident cannot be veri®ed, perform INCIDENT SIMULATION TESTS. Refer to GI section.
In case the ``DTC CONFIRMATION PROCEDURE'' is not available, perform the ``OVERALL FUNCTION CHECK''
instead. The DTC cannot be displayed by this check, however, this simpli®ed ``check'' is an effective alternative.
The ``NG'' result of the ``OVERALL FUNCTION CHECK'' is the same as the DTC detection.
STEP VTake the appropriate action based on the results of STEP I through IV.
If the malfunction code is indicated, proceed to TROUBLE DIAGNOSIS FOR DTC XX.
If the normal code is indicated, proceed to the BASIC INSPECTION. Refer to EC-46. Then perform inspections
according to the Symptom Matrix Chart. Refer to EC-48.
STEP VIIdentify where to begin diagnosis based on the relationship study between symptom and possible causes. Inspect
the system for mechanical binding, loose connectors or wiring damage using (tracing) ``Harness Layouts''.
Gently shake the related connectors, components or wiring harness with CONSULT set in ``DATA MONITOR
(AUTO TRIG)'' mode.
Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CON-
SULT. Refer to EC-54.
The ``DIAGNOSTIC PROCEDURE'' in EC section contains a description based on open circuit inspection. A short
circuit inspection is also required for the circuit check in the DIAGNOSTIC PROCEDURE. For details, refer to GI
section (``Circuit Inspection'', ``HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT'').
Repair or replace the malfunction parts.
STEP VIIOnce you have repaired the circuit or replaced a component, you need to run the engine in the same conditions
and circumstances which resulted in the customer's initial complaint.
Perform the ``DTC CONFIRMATION PROCEDURE'' and con®rm the normal code (Diagnostic trouble code No. 55)
is detected. If the incident is still detected in the ®nal check, perform STEP VI by using a different method from the
previous one.
Before returning the vehicle to the customer, be sure to erase the unnecessary (already ®xed) DTC in ECM. (Refer
to EC-30.)
TROUBLE DIAGNOSIS Ð Work Flow
EC-45

Basic Inspection
Precaution:
Perform Basic Inspection without electrical or mechanical
loads applied;
+Headlamp switch is OFF,
+Air conditioner switch is OFF,
+Rear defogger switch is OFF,
+Steering wheel is in the straight-ahead position, etc.
BEFORE STARTING
1. Check service records for any recent
repairs that may indicate a related
problem, or the current need for sched-
uled maintenance.
2. Open engine hood and check the fol-
lowing:
+Harness connectors for improper con-
nections
+Vacuum hoses for splits, kinks, or
improper connections
+Wiring for improper connections,
pinches, or cuts
3. Using priming pump, bleed air from fuel
system. Refer to ``DRAINING WATER'',
``Checking and Replacing Fuel Filter
and Draining Water'' of ``ENGINE
MAINTENANCE'' in MA section.
CONNECT CONSULT TO THE VEHICLE.
Connect ``CONSULT'' to the data link con-
nector for CONSULT and select
``ENGINE'' from the menu. Refer to
EC-36.
DOES ENGINE START?
Ye s
cNo
Turn ignition switch OFF,
wait 5 seconds and then
start engine. If engine fails
to start, check diagnostic
trouble code (DTC).
Run engine for 10 minutes.
CHECK IDLE SPEED.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Read engine idle speed in ``DATA
MONITOR'' mode with CONSULT.
--------------------------------------------------------------------------------------------------------------------------------------OR--------------------------------------------------------------------------------------------------------------------------------------
Check idle speed using tachom-
eter tester.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
775 25 rpm
(Go tojAon next page.)
SEF142I
SEF670V
SEF669V
SEF714V
SEF671V
.
.
.
.
.
TROUBLE DIAGNOSIS Ð Basic Inspection
EC-46