2001 NISSAN PICK-UP Repair Manual

SEF139P
Generic Scan Tool (GST)=NEEC0035DESCRIPTIONNEEC0035S01Generic Scan Tool (OBDII scan tool) complying with ISO 15031-4
has 8 different functions explained on the next page.
ISO9141 is used as the protocol.
The name ªGSTº or ªGeneric Scan Toolº is used in this service
manual.
SEC305D
GST INSPECTION PROCEDURENEEC0035S021. Turn ignition switch OFF.
2. Connect ªGSTº to data link connector for GST which is located
under LH dash panel near the fuse box cover.
SEF398S
3. Turn ignition switch ON.
4. Enter the program according to instruction on the screen or in
the operation manual.
(*: Regarding GST screens in this section, sample screens are
shown.)
SEF416S
5. Perform each diagnostic mode according to each service pro-
cedure.
For further information, see the GST Operation Manual of the
tool maker.
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Generic Scan Tool (GST)
EC-3080

FUNCTIONNEEC0035S03
Diagnostic test mode Function
MODE 1 READINESS TESTSThis mode gains access to current emission-related data values, including analog
inputs and outputs, digital inputs and outputs, and system status information.
MODE 2 (FREEZE DATA)This mode gains access to emission-related data value which were stored by ECM
during the freeze frame. [For details, refer to ªFreeze Frame Dataº (EC-3073).]
MODE 3 DTCsThis mode gains access to emission-related power train trouble codes which were
stored by ECM.
MODE 4 CLEAR DIAG INFOThis mode can clear all emission-related diagnostic information. This includes:
+Clear number of diagnostic trouble codes (MODE 1)
+Clear diagnostic trouble codes (MODE 3)
+Clear trouble code for freeze frame data (MODE 1)
+Clear freeze frame data (MODE 2)
+Reset status of system monitoring test (MODE 1)
+Clear on board monitoring test results (MODE 6 and 7)
MODE 6 (ON BOARD TESTS)This mode accesses the results of on board diagnostic monitoring tests of specific
components/systems that are not continuously monitored.
MODE 7 (ON BOARD TESTS)This mode enables the off board test drive to obtain test results for emission-related
powertrain components/systems that are continuously monitored during normal driv-
ing conditions.
MODE 8 Ð Ð
MODE 9 (CALIBRATION ID)This mode is to enable the off-board to request vehicle specific information such as
Vehicle Identification Number (VIN) and Calibration ID.
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Generic Scan Tool (GST)
EC-3081

MEF036D
IntroductionNEEC0036
SEF233G
SEF234G
The 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-3084.
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.
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DIAGNOSTIC WORKSHEETNEEC0036S01There 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. Examples:
+Vehicle ran out of fuel, which caused the engine to misfire.
+Fuel filler cap was left off or incorrectly screwed on, allowing
fuel to evaporate into the atmosphere.
TROUBLE DIAGNOSIS Ð
INTRODUCTION
KA24DE (EURO OBD)
Introduction
EC-3082

Worksheet SampleNEEC0036S0101
LEC031A
TROUBLE DIAGNOSIS Ð
INTRODUCTION
KA24DE (EURO OBD)
Introduction
EC-3083

Work FlowNEEC0037
SEF510ZD
*1: EC-3101
*2: If time data of ªSELF-DIAG
RESULTSº is other than ª0º or ª1tº
refer to ªTROUBLE DIAGNOSIS
FOR INTERMITTENTº, EC-3123.
*3: If the incident cannot be
duplicated, refer to ªTROUBLEDIAGNOSIS FOR INTERMIT-
TENT INCIDENTº, EC-3123.
*4: If the on board diagnostic system
cannot be performed, check main
power supply and ground circuit.
Refer to ªTROUBLE DIAGNOSIS
FOR POWER SUPPLYº, EC-3124.*5: If the malfunctioning part cannot
be found, refer to ªTROUBLE
DIAGNOSIS FOR INTERMIT-
TENT INCIDENTº, EC-3123.
*6: EC-3056
*7: EC-3119
TROUBLE DIAGNOSIS Ð
INTRODUCTION
KA24DE (EURO OBD)
Work Flow
EC-3084

DESCRIPTION FOR WORK FLOWNEEC0037S01
STEP DESCRIPTION
STEP IGet detailed information about the conditions and the environment when the incident/symptom occurred using the
ªDIAGNOSTIC WORK SHEETº, EC-3083.
STEP IIBefore confirming the concern, check and write down (print out using CONSULT-II or Generic Scan Tool) the (1st
trip) Diagnostic Trouble Code (DTC) and the (1st trip) freeze frame data, then erase the code and the data. (Refer
to EC-3060.) The (1st trip) DTC and the (1st trip) freeze frame data can be used when duplicating the incident at
STEP III & IV.
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-3102.)
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, perform²Incident Simulation Tests², refer to GI section.
If the malfunction code is detected, skip STEP IV and perform STEP V.
STEP IVTry to detect the (1st trip) Diagnostic Trouble Code by driving in (or performing) the ªDIAGNOSTIC TROUBLE
CODE CONFIRMATION PROCEDUREº. Check and read the (1st trip) DTC and (1st trip) freeze frame data by
using CONSULT-II or Generic Scan Tool.
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 ªIncident Simulation Testsº, refer to GI section.
In case the ªDIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDUREº is not available, perform the
ªOVERALL FUNCTION CHECKº instead. The (1st trip) DTC cannot be displayed by this check, however, this sim-
plified 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 to the BASIC INSPECTION. (Refer to EC-3086.) If CONSULT-II is
available, perform ªDATA MONITOR (SPEC)º mode with CONSULT-II and proceed to the ªTROUBLE DIAGNOSIS
Ð SPECIFICATION VALUEº, EC-3119. (If malfunction is detected, proceed to ªREPAIR/REPLACEº.) Then perform
inspections according to the Symptom Matrix Chart. (Refer to EC-3102.)
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-3110.
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
ªHOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENTº, ªCircuit Inspectionº, GI section.
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 ªDIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDUREº and confirm the normal code [Diag-
nostic trouble code No. P0000 or 0505] 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. (Refer to EC-3060.)
TROUBLE DIAGNOSIS Ð
INTRODUCTION
KA24DE (EURO OBD)
Work Flow
EC-3085

Basic InspectionNEEC0038Precaution:
Perform Basic Inspection without electrical or mechanical
loads applied;
+Headlamp switch is OFF,
+Air conditioner switch is OFF,
+Rear window defogger switch is OFF,
+Steering wheel is in the straight-ahead position, etc.
1 INSPECTION START
1. Check service records for any recent repairs that may indicate a related problem, or the current need for scheduled
maintenance.
2. Open engine hood and check the following:
+Harness connectors for improper connections
+Vacuum hoses for splits, kinks, or improper connections
+Wiring for improper connections, pinches, or cuts
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With CONSULT-II©GO TO 2.
With GST©GO TO 4.
No tools©GO TO 5.
2 CONNECT CONSULT-II TO THE VEHICLE
Connect ªCONSULT-IIº to the data link connector and select ªENGINEº from the menu. Refer to EC-3070.
SEC305D
©GO TO 3.
TROUBLE DIAGNOSIS Ð BASIC
INSPECTION
KA24DE (EURO OBD)
Basic Inspection
EC-3086

3 CHECK FI CAM FUNCTION
With CONSULT-II
1. Adjust accelerator wire. Refer to ªAdjust Accelerator Wireº, FE section.
2. Warm up engine to 75ÉC (167ÉF).
3. Stop engine and wait at least 5 seconds, then turn ignition switch ON.
4. Select ªCOOLAN TEMP/Sº in ªDATA MONITORº mode with CONSULT-II.
5. When the engine coolant temp is 75 to 85ÉC (167 to 185ÉF), confirm the clearance is less than 0.05 mm (0.0020 in),
between stopper and throttle drum as shown in the figure.
AEC871A
OK or NG
OK©GO TO 6.
NG©1. Replace throttle body assembly. Refer to ªOUTER COMPONENT PARTSº, EM sec-
tion.
2. GO TO 6.
4 CHECK FI CAM FUNCTION
With GST
1. Adjust accelerator wire. Refer to ªAdjust Accelerator Wireº, FE section.
2. Warm up engine to 75ÉC (167ÉF).
3. Stop engine and wait at least 10 seconds, then turn ignition switch ON.
4. Select ªMODE 1º with GST.
5. When the engine coolant temp is 75 to 85ÉC (167 to 185ÉF), confirm the clearance is less than 0.05 mm (0.0020 in),
between stopper and throttle drum as shown in the figure.
AEC871A
OK or NG
OK (With CONSULT-II)©GO TO 6.
OK (Without CONSULT-
II)©GO TO 14.
NG©1. Replace throttle body assembly. Refer to ªOUTER COMPONENT PARTSº, EM sec-
tion.
2. With CONSULT-II: GO TO 6.
Without CONSULT-II: GO TO 14.
TROUBLE DIAGNOSIS Ð BASIC
INSPECTION
KA24DE (EURO OBD)
Basic Inspection
EC-3087