wiring NISSAN ALMERA 2001 Manual PDF

Diagnostic Procedure ..............................................487
Component Inspection .............................................490
EGR VOLUME CONTROL SYSTEM (WHERE
FITTED)........................................................................491
Description ...............................................................491
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................492
ECM Terminals and Reference Value .....................493
Wiring Diagram ........................................................494
Diagnostic Procedure ..............................................496
Component Inspection .............................................501
EVAP CANISTER PURGE VOLUME CONTROL
SOLENOID VALVE......................................................503
Description ...............................................................503
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................503
ECM Terminals and Reference Value .....................504
Wiring Diagram ........................................................505
Diagnostic Procedure ..............................................507
Component Inspection .............................................510
IDLE AIR CONTROL VALVE (IACV) - AUXILIARY
AIR CONTROL............................................................ 511
Description ............................................................... 511
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................512
ECM Terminals and Reference Value .....................512
Wiring Diagram ........................................................513
Diagnostic Procedure ..............................................515
Component Inspection .............................................519
CLOSED THROTTLE POSITION SWITCH
(WHERE FITTED)........................................................520
Component Description ...........................................520
ECM Terminals and Reference Value .....................520
Wiring Diagram ........................................................521
Diagnostic Procedure ..............................................522
Component Inspection .............................................525
INTAKE VALVE TIMING CONTROL SOLENOID
VALVE..........................................................................526
Component Description ...........................................526
Operation .................................................................526
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................526
ECM Terminals and Reference Value .....................526
Wiring Diagram ........................................................527
Diagnostic Procedure ..............................................529
Component Inspection .............................................531
A/T COMMUNICATION LINE......................................532
System Description ..................................................532
Wiring Diagram ........................................................533
Diagnostic Procedure ..............................................534
PARK/NEUTRAL POSITION (PNP) SWITCH............536
Component Description ...........................................536CONSULT-II Reference Value in Data Monitor
Mode ........................................................................536
ECM Terminals and Reference Value .....................536
Wiring Diagram ........................................................537
Diagnostic Procedure ..............................................538
INJECTOR...................................................................541
Component Description ...........................................541
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................541
ECM Terminals and Reference Value .....................541
Wiring Diagram ........................................................542
Diagnostic Procedure ..............................................544
Component Inspection .............................................546
IGNITION SIGNAL.......................................................547
Component Description ...........................................547
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................547
ECM Terminals and Reference Value .....................547
Wiring Diagram ........................................................548
Diagnostic Procedure ..............................................551
Component Inspection .............................................555
START SIGNAL...........................................................557
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................557
ECM Terminals and Reference Value .....................557
Wiring Diagram ........................................................558
Diagnostic Procedure ..............................................559
FUEL PUMP.................................................................561
System Description ..................................................561
Component Description ...........................................561
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................561
ECM Terminals and Reference Value .....................562
Wiring Diagram ........................................................563
Diagnostic Procedure ..............................................564
Component Inspection .............................................566
POWER STEERING OIL PRESSURE SWITCH.........567
Component Description ...........................................567
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................567
ECM Terminals and Reference Value .....................567
Wiring Diagram ........................................................568
Diagnostic Procedure ..............................................569
Component Inspection .............................................570
REFRIGERANT PRESSURE SENSOR......................572
Description ...............................................................572
ECM Terminals and Reference Value .....................572
Wiring Diagram ........................................................573
Diagnostic Procedure ..............................................575
ELECTRICAL LOAD SIGNAL.....................................578
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................578
CONTENTS(Cont'd)
EC-6

ECM Terminals and Reference Value .....................578
Wiring Diagram ........................................................579
Diagnostic Procedure - Load Signal - .....................583
Diagnostic Procedure - Heater Control Panel
(Fan Switch) - ..........................................................589
Component Inspection .............................................590
MI & DATA LINK CONNECTORS..............................591
Wiring Diagram ........................................................591
SERVICE DATA AND SPECIFICATIONS (SDS).......593
Fuel Pressure Regulator..........................................593
Idle Speed and Ignition Timing ................................593
Mass Air Flow Sensor..............................................593
Intake Air Temperature Sensor ................................593
Engine Coolant Temperature Sensor ......................593
Throttle Position Sensor ..........................................593
Heated Oxygen Sensor 1 Heater (Front) ................593
Heated Oxygen Sensor 2 Heater (Rear).................593
Fuel Tank Temperature Sensor (Where Fitted) .......594
EGR Volume Control Valve (Where Fitted) .............594
EGR Temperature Sensor (Where Fitted) ...............594
EVAP Canister Purge Volume Control Valve ..........594
IACV-AAC Valve ......................................................594
Injector .....................................................................594
Ignition Coil with Power Transistor ..........................594
Condenser ...............................................................594
Fuel Pump ...............................................................594
Crankshaft Position Sensor (POS) ..........................595
Camshaft Position Sensor (PHASE) .......................595
YD
TROUBLE DIAGNOSIS - INDEX................................596
Alphabetical & P No. Index for DTC .......................596
PRECAUTIONS...........................................................598
Supplemental Restraint System (SRS)²AIR
BAG²and²SEAT BELT PRE-TENSIONER²...........598
Engine Fuel & Emission Control System ................599
Precautions ..............................................................600
Wiring Diagrams and Trouble Diagnosis .................601
PREPARATION...........................................................602
Special Service Tools ..............................................602
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM.......................................................................603
Engine Control Component Parts Location .............603
Circuit Diagram ........................................................606
System Diagram ......................................................608
System Chart ...........................................................609
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION.............................................610
Fuel Injection Control System .................................610
Fuel Injection Timing Control System...................... 611
Air Conditioning Cut Control ....................................612Fuel Cut Control (at no load & high engine
speed) ......................................................................612
Crankcase Ventilation System .................................613
BASIC SERVICE PROCEDURE.................................614
Injection Tube and Injection Nozzle ........................614
Electronic Control Fuel Injection Pump ...................618
Fuel Filter .................................................................625
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION.............................................................627
DTC and MI Detection Logic ...................................627
Diagnostic Trouble Code (DTC) ..............................627
Malfunction Indicator (MI) ........................................628
CONSULT-II .............................................................632
TROUBLE DIAGNOSIS - INTRODUCTION................637
Introduction ..............................................................637
Work Flow ................................................................639
TROUBLE DIAGNOSIS - BASIC INSPECTION.........641
Basic Inspection.......................................................641
TROUBLE DIAGNOSIS - GENERAL
DESCRIPTION.............................................................646
Symptom Matrix Chart .............................................646
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................656
Major Sensor Reference Graph in Data Monitor
Mode ........................................................................658
ECM Terminals and Reference Value .....................659
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT.....................................................................665
Description ...............................................................665
Diagnostic Procedure ..............................................665
TROUBLE DIAGNOSIS FOR POWER SUPPLY........666
Main Power Supply and Ground Circuit ..................666
DTC P0100 MASS AIR FLOW SEN...........................673
Component Description ...........................................673
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................673
ECM Terminals and Reference Value .....................673
On Board Diagnosis Logic.......................................673
DTC Confirmation Procedure ..................................673
Wiring Diagram ........................................................675
Diagnostic Procedure ..............................................677
DTC P0115 COOLANT TEMP SEN............................680
Description ...............................................................680
On Board Diagnosis Logic.......................................680
DTC Confirmation Procedure ..................................680
Wiring Diagram ........................................................682
Diagnostic Procedure ..............................................683
DTC P0120 ACCEL POS SENSOR............................685
Description ...............................................................685
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................685
ECM Terminals and Reference Value .....................685
CONTENTS(Cont'd)
EC-7

On Board Diagnosis Logic.......................................686
DTC Confirmation Procedure ..................................686
Wiring Diagram ........................................................687
Diagnostic Procedure ..............................................688
DTC P0335 CRANK POS SEN (TDC)........................695
Description ...............................................................695
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................695
ECM Terminals and Reference Value .....................695
On Board Diagnosis Logic.......................................695
DTC Confirmation Procedure ..................................696
Wiring Diagram ........................................................697
Diagnostic Procedure ..............................................698
DTC P0500 VEHICLE SPEED SEN............................701
Description ...............................................................701
ECM Terminals and Reference Value .....................701
On Board Diagnosis Logic.......................................701
Overall Function Check ...........................................701
Wiring Diagram ........................................................703
Diagnostic Procedure ..............................................705
DTC P0571 BRAKE SW..............................................706
Description ...............................................................706
ECM Terminals and Reference Value .....................706
On Board Diagnosis Logic.......................................706
DTC Confirmation Procedure ..................................706
Wiring Diagram ........................................................708
Diagnostic Procedure ..............................................710
DTC P1107 ECM 10....................................................714
Description ...............................................................714
On Board Diagnosis Logic.......................................714
DTC Confirmation Procedure ..................................714
Diagnostic Procedure ..............................................715
DTC P1180 P9.FUEL TEMP SEN...............................716
Description ...............................................................716
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................716
ECM Terminals and Reference Value .....................717
On Board Diagnosis Logic.......................................717
DTC Confirmation Procedure ..................................717
Wiring Diagram ........................................................719
Diagnostic Procedure ..............................................721
DTC P1202 FUEL CUT SYSTEM2.............................723
Description ...............................................................723
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................723
ECM Terminals and Reference Value .....................724
On Board Diagnosis Logic.......................................724
DTC Confirmation Procedure ..................................724
Wiring Diagram ........................................................726
Diagnostic Procedure ..............................................728
DTC P1217 OVER HEAT............................................730
Description ...............................................................730CONSULT-II Reference Value in Data Monitor
Mode ........................................................................730
ECM Terminals and Reference Value .....................730
On Board Diagnosis Logic.......................................731
Overall Function Check ...........................................732
Wiring Diagram ........................................................733
Diagnostic Procedure ..............................................735
Main 12 Causes of Overheating..............................756
DTC P1241 P7.F/INJ TIMG FB...................................757
Description ...............................................................757
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................757
ECM Terminals and Reference Value .....................758
On Board Diagnosis Logic.......................................758
DTC Confirmation Procedure ..................................758
Wiring Diagram ........................................................760
Diagnostic Procedure ..............................................762
DTC P1251 P4.SPILL/V CIRC....................................764
Description ...............................................................764
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................764
ECM Terminals and Reference Value .....................765
On Board Diagnosis Logic.......................................765
DTC Confirmation Procedure ..................................765
Wiring Diagram ........................................................767
Diagnostic Procedure ..............................................769
DTC P1337 P2.DTC PULSE SIG................................771
Description ...............................................................771
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................771
ECM Terminals and Reference Value .....................772
On Board Diagnosis Logic.......................................772
DTC Confirmation Procedure ..................................772
Wiring Diagram ........................................................774
Diagnostic Procedure ..............................................776
DTC P1341 P1.CAM POS SEN..................................778
Description ...............................................................778
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................778
ECM Terminals and Reference Value .....................779
On Board Diagnosis Logic.......................................779
DTC Confirmation Procedure ..................................779
Wiring Diagram ........................................................781
Diagnostic Procedure ..............................................783
DTC P1600 P3.PUMP COMM LINE............................785
Description ...............................................................785
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................785
ECM Terminals and Reference Value .....................786
On Board Diagnosis Logic.......................................786
DTC Confirmation Procedure ..................................786
Wiring Diagram ........................................................788
CONTENTS(Cont'd)
EC-8

Diagnostic Procedure ..............................................790
DTC P1603 ECM 12, DTC P1607 ECM 2...................792
Description ...............................................................792
On Board Diagnosis Logic.......................................792
DTC Confirmation Procedure ..................................792
Diagnostic Procedure ..............................................793
DTC P1620 ECM RLY.................................................794
ECM Terminals and Reference Value .....................794
On Board Diagnosis Logic.......................................794
DTC Confirmation Procedure ..................................794
Wiring Diagram ........................................................795
Diagnostic Procedure ..............................................797
DTC P1621 ECM 15....................................................799
Description ...............................................................799
On Board Diagnosis Logic.......................................799
DTC Confirmation Procedure ..................................799
Diagnostic Procedure ..............................................800
DTC P1660 BATTERY VOLTAGE..............................801
On Board Diagnosis Logic.......................................801
DTC Confirmation Procedure ..................................801
Diagnostic Procedure ..............................................801
DTC P1690 P5.PUMP C/MODULE.............................803
Description ...............................................................803
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................803
ECM Terminals and Reference Value .....................804
On Board Diagnosis Logic.......................................804
DTC Confirmation Procedure ..................................804
Diagnostic Procedure ..............................................805
GLOW CONTROL SYSTEM.......................................806
Description ...............................................................806
ECM Terminals and Reference Value .....................807Wiring Diagram ........................................................808
Diagnostic Procedure ..............................................809
EGR VOLUME CONTROL SYSTEM..........................815
Description ...............................................................815
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................816
ECM Terminals and Reference Value .....................816
Wiring Diagram ........................................................817
Diagnostic Procedure ..............................................819
START SIGNAL...........................................................823
Wiring Diagram ........................................................823
Diagnostic Procedure ..............................................824
PARK/NEUTRAL POSITION (PNP) SWITCH
(WHERE FITTED)........................................................826
Description ...............................................................826
CONSULT-II Reference Value in Data Monitor
Mode ........................................................................826
ECM Terminals and Reference Value .....................826
Wiring Diagram ........................................................827
Diagnostic Procedure ..............................................828
AIR CONDITIONER CONTROL..................................830
Wiring Diagram ........................................................830
MI & DATA LINK CONNECTORS..............................831
Wiring Diagram ........................................................831
SERVICE DATA AND SPECIFICATIONS (SDS).......834
General Specifications .............................................834
Injection Nozzle .......................................................834
Engine Coolant Temperature Sensor ......................834
Crankshaft Position Sensor (TDC) ..........................834
Glow Plug ................................................................834
Accelerator Position Sensor ....................................834
EGR Volume Control Valve .....................................834
CONTENTS(Cont'd)
EC-9

Supplemental Restraint System (SRS) ªAIR
BAGº and ªSEAT BELT PRE-TENSIONERº
NJEC0002The Supplemental Restraint System such as ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº used along with
a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of
collision. The SRS system composition which is available to NISSAN MODEL N16 is as follows (The compo-
sition varies according to the destination and optional equipment.):
+For a frontal collision
The Supplemental Restraint System consists of driver air bag module (located in the center of the steer-
ing wheel), front passenger air bag module (located on the instrument panel on passenger side), front seat
belt pre-tensioners, a diagnoses sensor unit, warning lamp, wiring harness and spiral cable.
+For a side collision
The Supplemental Restraint System consists of front side air bag module (located in the outer side of front
seat), side air bag (satellite) sensor, diagnoses sensor unit (one of components of air bags for a frontal
collision), wiring harness, warning lamp (one of components of air bags for a frontal collision).
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 inflation, all maintenance should be per-
formed 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. SRS wiring harness can be identified by yellow harness connector.
Precautions for On Board Diagnostic (OBD)
System of Engine and A/T
NJEC0003The ECM has an on board diagnostic system. It will light up the malfunction indicator (MI) to warn the driver
of a malfunction causing emission deterioration.
CAUTION:
+Be sure to turn the ignition switch ªOFFº and disconnect the negative battery terminal before any
repair or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc.
will cause the MI to light up.
+Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MI to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
+Certain systems and components, especially those related to OBD, may use a new style slide-
locking type harness connector.
For description and how to disconnect, refer to EL section, ªDescriptionº, ªHARNESS CONNEC-
TORº.
+Be sure to route and secure the harnesses properly after work. The interference of the harness with
a bracket, etc. may cause the MI to light up due to the short circuit.
+Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MI to light up due to the malfunction of fuel injection system, etc.
+Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission Control Module) before returning the vehicle to the customer.
PRECAUTIONSQG
Supplemental Restraint System (SRS) ªAIR BAGº and ªSEAT BELT PRE-TENSIONERº
EC-16

SEF605X
+Do not operate fuel pump when there is no fuel in lines.
+Tighten fuel hose clamps to the specified torque.
SEF709Y
+Do not depress accelerator pedal when starting.
+Immediately after starting, do not rev up engine unneces-
sarily.
+Do not rev up engine just prior to shutdown.
SEF708Y
+When installing C.B. ham radio or a mobile phone, be sure
to observe the following as it may adversely affect elec-
tronic control systems depending on installation location.
1)Keep the antenna as far as possible from the electronic
control units.
2)Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Do not let them run parallel for a long distance.
3)Adjust the antenna and feeder line so that the standing-
wave ratio can be kept smaller.
4)Be sure to ground the radio to vehicle body.
Wiring Diagrams and Trouble DiagnosisNJEC0006When you read Wiring diagrams, refer to the following:
+GI-11, ªHOW TO READ WIRING DIAGRAMSº
+EL-10, ªPOWER SUPPLY ROUTINGº for power distribution
circuit
When you perform trouble diagnosis, refer to the following:
+GI-31, ªHOW TO FOLLOW TEST GROUP IN TROUBLE
DIAGNOSISº
+GI-21, ªHOW TO PERFORM EFFICIENT DIAGNOSIS FOR
AN ELECTRICAL INCIDENTº
PRECAUTIONSQG
Engine Fuel & Emission Control System (Cont'd)
EC-19

21 CHECK HEATED OXYGEN SENSOR 1 (FRONT) SIGNAL
With CONSULT-II
1. Stop engine.
2. Replace heated oxygen sensor 1 (front).
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. See ªHO2S1 MNTR (B1)º in ªDATA MONITORº mode.
6. Running engine at 2,000 rpm under no-load (engine is warmed up to normal operating temperature.), check that the
monitor fluctuates between ªLEANº and ªRICHº more than 5 times during 10 seconds.
1 time: RICH®LEAN®RICH
2 times: RICH®LEAN®RICH®LEAN®RICH
Without CONSULT-II
1. Stop engine.
2. Replace heated oxygen sensor 1 (front).
3. Start engine and warm it up to normal operating temperature.
4. Run engine at approx. 2,000 rpm for approx. 2 minutes under no-load.
5. Set voltmeter probe between ECM terminal 62 and ground.
6. Make sure that the voltage fluctuates between 0 to 0.3V and 0.6 to 1.0V more than 5 times during 10 seconds at 2,000
rpm.
1 time: 0 - 0.3V®0.6 - 1.0V®0 - 0.3V
2 times: 0 - 0.3V®0.6 - 1.0V®0 - 0.3V®0.6 - 1.0V®0 - 0.3V
OK or NG
OK©INSPECTION END
NG©GO TO 22.
22 DETECT MALFUNCTIONING PART
Check the following.
1. Check fuel pressure regulator. Refer to EC-41.
2. Check mass air flow sensor and its circuit. Refer to EC-187.
3. Check injector and its circuit. Refer to EC-541.
Clean or replace if necessary.
4. Check engine coolant temperature sensor and its circuit. Refer to EC-201.
5. Check ECM function by substituting another known-good ECM.
(ECM may be the cause of a problem, but this is rarely the case.)
©GO TO 3.
23 CHECK HEATED OXYGEN SENSOR 1 (FRONT) HARNESS
1. Turn off engine and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 (front) harness connector.
4. Check harness continuity between ECM terminal 62 and heated oxygen sensor 1 (front) harness connector terminal 1.
Refer to Wiring Diagram, EC-216.
Continuity should exist.
OK or NG
OK©GO TO 25.
NG©GO TO 24.
24 REPAIR OR REPLACE
Repair or replace harness between ECM and heated oxygen sensor 1 (front).
©GO TO 3.
BASIC SERVICE PROCEDUREQG
Inspection Procedure (Cont'd)
EC-53

MEF036D
SEF233G
SEF234G
IntroductionNJEC0036The engine has an ECM to control major systems such as fuel
control, ignition control, idle air control system, etc. The ECM
accepts input signals from sensors and instantly drives actuators.
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, fouled spark plugs, 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 find the cause of the problems. A road
test with CONSULT-II (or GST) or a circuit tester connected should
be performed. Follow the ªWork Flowº on EC-98.
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, espe-
cially intermittent ones. Find out what symptoms are present and
under what conditions they occur. A ªDiagnostic Worksheetº like the
example on next page should be used.
Start your diagnosis by looking for ªconventionalº problems first.
This will help troubleshoot driveability problems on an electronically
controlled engine vehicle.
SEF907L
DIAGNOSTIC WORKSHEETNJEC0036S01There are many operating conditions that lead to the malfunction
of engine components. A good grasp of such conditions can make
trouble-shooting faster and more accurate.
In general, each customer feels differently about a problem. It is
important to fully understand the symptoms or conditions for a
customer complaint.
Utilize a diagnostic worksheet like the one on the next page in order
to organize all the information for troubleshooting.
Some conditions may cause the malfunction indicator lamp to
come on steady or blink and DTC to be detected.
Example:
Vehicle ran out of fuel, which caused the engine to misfire.
TROUBLE DIAGNOSIS Ð INTRODUCTIONQG
EC-96

DESCRIPTION FOR WORK FLOWNJEC0563S01
STEP DESCRIPTION
STEP IGet detailed information about the conditions and the environment when the incident/symptom occurred using
the ªDIAGNOSTIC WORK SHEETº, EC-97.
STEP IIBefore confirming the concern, check and write down (print out using CONSULT-II or GST) the (1st trip) DTC
and the (1st trip) freeze frame data, then erase the DTC and the data. (Refer to EC-70, EC-73.) The (1st trip)
DTC and the (1st trip) freeze frame data can be used when duplicating the incident at STEP III & IV.
If the incident cannot be verified, perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-177.
Study the relationship between the cause, specified by (1st trip) DTC, and the symptom described by the cus-
tomer. (The ªSymptom Matrix Chartº will be useful. See EC-155.)
Also check related service bulletins for information.
STEP IIITry to confirm the symptom and under what conditions the incident occurs.
The ªDIAGNOSTIC WORK SHEETº and the freeze frame data are useful to verify the incident. Connect CON-
SULT-II to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results.
If the incident cannot be verified, perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-177.
If the malfunction code is detected, skip STEP IV and perform STEP V.
STEP IVTry to detect the (1st trip) DTC by driving in (or performing) the ªDTC Confirmation Procedureº. Check and read
the (1st trip) DTC and (1st trip) freeze frame data by using CONSULT-II or GST.
During the (1st trip) DTC verification, be sure to connect CONSULT-II to the vehicle in DATA MONITOR (AUTO
TRIG) mode and check real time diagnosis results.
If the incident cannot be verified, perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-177.
In case the ªDTC Confirmation Procedureº is not available, perform the ªOverall Function Checkº instead. The
(1st trip) DTC cannot be displayed by this check, however, this simplified ªcheckº is an effective alternative.
The ªNGº result of the ªOverall Function Checkº is the same as the (1st trip) 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 PXXXX.
If the normal code is indicated, proceed refer to ªBASIC INSPECTIONº, EC-100. If CONSULT-II is available, per-
form ªDATA MONITOR (SPEC)º mode with CONSULT-II and proceed to the ªTROUBLE DIAGNOSIS Ð SPECI-
FICATION VALUEº. (Refer to EC-173.) (If malfunction is detected, proceed to ªREPAIR/REPLACEº.) Then per-
form inspections according to the Symptom Matrix Chart. (Refer to EC-155.)
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) ªHarness Layoutsº.
Gently shake the related connectors, components or wiring harness with CONSULT-II set in ªDATA MONITOR
(AUTO TRIG)º mode.
Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CON-
SULT-II. Refer to EC-164.
The ªDiagnostic Procedureº 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
(ªHOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENTº, ªCircuit Inspectionº).
Repair or replace the malfunction parts.
If malfunctioning part cannot be detected, perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº,
EC-177.
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 ªDTC Confirmation Procedureº and confirm the normal code [DTC No. P0000] is detected. If the
incident is still detected in the final 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 fixed) (1st trip) DTC in
ECM and TCM (Transmission control module). (Refer to EC-70, EC-73.)
TROUBLE DIAGNOSIS Ð INTRODUCTIONQG
Work Flow (Cont'd)
EC-99

Basic Inspection/SedanNJEC1736Precaution:
Perform Basic Inspection without electrical or mechanical
loads applied;
+Headlamp switch is OFF,
On vehicle equipped with daytime light systems, set lighting
switch to the 1st position to light only small lamps.
+Air conditioner switch is OFF,
+Rear window defogger switch is OFF,
+Steering wheel is in the straight-ahead position, etc.
MODELS WITH THROTTLE POSITION SWITCHNJEC1736S01
1 INSPECTION START
1. Check service records for any recent repairs that may indicate a related problem, or a current need for scheduled
maintenance.
2. Open engine hood and check the following:
+Harness connectors for improper connections
+Vacuum hoses for splits, kinks and improper connections
+Wiring for improper connections, pinches and cuts
+Air cleaner clogging
+Hoses and ducts for leaks
SEF983U
©GO TO 2.
2 CHECK THROTTLE OPENER OPERATION-I
Confirm that there is a clearance between throttle drum and stopper.
SEF850Y
OK or NG
OK©GO TO 4.
NG©GO TO 3.
TROUBLE DIAGNOSIS Ð BASIC INSPECTIONQG
Basic Inspection/Sedan
EC-100