2001 NISSAN PICK-UP Repair Manual

15 CHECK HEATED OXYGEN SENSOR 1 SIGNAL
With CONSULT-II
1. Replace heated oxygen sensor 1.
2. See ªHO2S1 MNTR (B1)º in ªDATA MONITORº mode.
3. Maintain 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 five times during 10 seconds.
1 cycle: RICH®LEAN®RICH
2 cycles: RICH®LEAN®RICH®LEAN®RICH
Without CONSULT-II
1. Stop engine.
2. Replace heated oxygen sensor 1.
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 50 and ground.
6. Make sure that voltage fluctuates between 0 - 0.3V and 0.6 - 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©GO TO 12.
NG©GO TO 16.
16 DETECT MALFUNCTIONING PART
1. Connect heated oxygen sensor 1 harness connector to heated oxygen sensor 1.
2. Check fuel pressure regulator. Refer to EC-3034.
3. Check mass air flow sensor and its circuit.
Refer to EC-3143, EC-3151.
4. Check injector and its circuit.
Refer to EC-3369.
Clean or replace if necessary.
5. Check engine coolant temperature sensor and its circuit. Refer to EC-3165.
6. 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 12.
+If a vehicle contains a part which is operating outside of design specifications with no MI
illumination, the part shall not be replaced prior to emission testing unless it is determined that
the part has been tampered with or abused in such a way that the diagnostic system cannot rea-
sonably be expected to detect the resulting malfunction.
BASIC SERVICE PROCEDUREKA24DE (EURO OBD)
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment
EC-3048

IntroductionNEEC0029The ECM has an on board diagnostic system which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:
Diagnostic Trouble Code (DTC) Mode 3 of ISO 15031-5
Freeze Frame data Mode 2 of ISO 15031-5
System Readiness Test (SRT) code Mode 1 of ISO 15031-5
1st Trip Diagnostic Trouble Code (1st Trip DTC) Mode 7 of ISO 15031-5
1st Trip Freeze Frame data
Test values and Test limits Mode 6 of ISO 15031-5
Calibration ID Mode 9 of ISO 15031-6
The above information can be checked using procedures listed in the table below.
X: Applicable Ð: Not applicable
DTC 1st trip DTCFreeze Frame
data1st trip Freeze
Frame dataSRT code Test value
CONSULT-IIXXXXXÐ
GST X X*1 X Ð X X
*1: 1st trip DTCs for self-diagnoses concerning SRT items cannot be shown on the GST display.
The malfunction indicator (MI) on the instrument panel lights up when the same malfunction is detected in two
consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-3101.)
Two Trip Detection LogicNEEC0030When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in
the ECM memory. The MI will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored
in the ECM memory, and the MI lights up. The MI lights up at the same time when the DTC is stored. <2nd
trip> The ªtripº in the ªTwo Trip Detection Logicº means a driving mode in which self-diagnosis is performed
during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MI,
and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
X: Applicable Ð: Not applicable
ItemsMI DTC 1st trip DTC
1st trip 2nd trip
1st trip
displaying2nd trip
displaying1st trip
displaying2nd trip
displaying
Blinking Lighting up Blinking Lighting up
Misfire (Possible three way cata-
lyst damage) Ð DTC: P0300 -
P0304 is being detectedX ÐÐÐÐÐXÐ
Misfire (Possible three way cata-
lyst damage) Ð DTC: P0300 -
P0304 is being detectedÐÐ X ÐÐXÐÐ
Fail-safe items (Refer to
EC-3101.)Ð X Ð Ð X*1 Ð X*1 Ð
Except above Ð Ð Ð X Ð X X Ð
*1: Except ªECMº
Emission-related Diagnostic InformationNEEC0031DTC AND 1ST TRIP DTCNEEC0031S01The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not reoccur, the 1st trip
DTC will not be displayed. If a malfunction is detected during the 1st trip, the 1st trip DTC is stored in the ECM
memory. The MI will not light up (two trip detection logic). If the same malfunction is not detected in the 2nd
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Introduction
EC-3049

trip (meeting the required driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same mal-
function is detected in the 2nd trip, both the 1st trip DTC and DTC are stored in the ECM memory and the MI
lights up. In other words, the DTC is stored in the ECM memory and the MI lights up when the same malfunc-
tion occurs in two consecutive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed
between the 1st and 2nd trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or
light up the MI during the 1st trip, the DTC and 1st trip DTC are stored in the ECM memory.
Procedures for clearing the DTC and the 1st trip DTC from the ECM memory are described in ªHOW TO
ERASE EMISSION-RELATED DIAGNOSTIC INFORMATIONº. Refer to EC-3060.
For malfunctions in which 1st trip DTCs are displayed, refer to EC-3058. These items are required by legal
regulations to continuously monitor the system/component. In addition, the items monitored non-continuously
are also displayed on CONSULT-II.
1st trip DTC is specified in Mode 7 of ISO 15031-5. 1st trip DTC detection occurs without lighting up the MI
and therefore does not warn the driver of a problem. However, 1st trip DTC detection will not prevent the
vehicle from being tested, for example during Inspection/Maintenance (I/M) tests.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame
data as specified in ªWork Flowº procedure Step II, refer to page EC-3084. Then perform ªDTC Confirmation
Procedureº or ªOverall Function Checkº to try to duplicate the problem. If the malfunction is duplicated, the
item requires repair.
How to read DTC and 1st Trip DTCNEEC0031S0101DTC and 1st trip DTC can be read by the following methods.
With CONSULT-II
With GST
CONSULT-II or GST (Generic Scan Tool) Examples: P0340 etc.
These DTCs are prescribed by ISO 15031-5.
(CONSULT-II also displays the malfunctioning component or system.)
+1st trip DTC No. is the same as DTC No.
+Output of a DTC indicates a malfunction. However, GST does not indicate whether the malfunction
is still occurring or has occurred in the past and has returned to normal.
CONSULT-II can identify malfunction status as shown below. Therefore, using CONSULT-II (if avail-
able) is recommended.
A sample of CONSULT-II display for DTC is shown below. DTC or 1st trip DTC of a malfunction is displayed
in SELF-DIAGNOSTIC RESULTS mode of CONSULT-II. Time data indicates how many times the vehicle was
driven after the last detection of a DTC.
If the DTC is being detected currently, the time data will be ª0º.
If a 1st trip DTC is stored in the ECM, the time data will be ª[1t]º.
LEC028A
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATANEEC0031S02The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant
temperature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, throttle valve opening, base
fuel schedule and intake air temperature at the moment a malfunction is detected.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-II or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For
details, see EC-3073.
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Emission-related Diagnostic Information
EC-3050

ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no prior-
ity for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MI on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-
lowing priorities to update the data.
Priority Items
1Freeze frame data Misfire Ð DTC: P0300 - P0304
Fuel Injection System Function Ð DTC: P0171, P0172
2 Except the above items
3 1st trip freeze frame data
For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was stored in the 2nd
trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated
from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-
function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is
stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or
1st trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and
freeze frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged
in the ECM memory.
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM
memory is erased. Procedures for clearing the ECM memory are described in ªHOW TO ERASE EMISSION-
RELATED DIAGNOSTIC INFORMATIONº. Refer to EC-3060.
SYSTEM READINESS TEST (SRT) CODENEEC0031S03System Readiness Test (SRT) code is specified in Mode 1 of ISO 15051-5.
As part of enhanced emissions test for Inspection and Maintenance (I/M), certain states require that the sta-
tus of srt be used to indicate whether the ECM has completed self-diagnosis of major emission systems and
components. Completion must be verified in order for the emissions inspection to proceed.
If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating ªincompleteº,
use the information in this service manual to set the SRT to ªcompleteº.
In most cases, the ECM will automatically complete its self-diagnosis cycle during normal usage and the SRT
status will indicate ªcompleteº for each application system. Once set as ªcompleteº, the SRT status remains
ªcompleteº until the self-diagnosis memory is erased.
Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's
normal driving pattern and the SRT will indicate ªincompleteº for these items.
NOTE:
The SRT will also indicate ªincompleteº if the self-diagnosis memory is erased for any reason or if the ECM
memory power supply is interrupted for several hours.
If, during the state emissions inspection, the SRT indicates ªcompleteº for all test items, the inspector will con-
tinue with the emissions test. However, if the SRT indicates ªincompleteº for one or more of the SRT items,
the vehicle is returned to the customer untested.
NOTE:
If MI is ªONº during the state emissions inspection, the vehicle is also returned to the customer untested even
though the SRT indicates ªcompleteº for all test items. Therefore, it is important to check SRT (ªcompleteº)
and DTC (No DTCs) before the inspection.
This service manual contains the service procedure and support information to perform a comprehensive road
test that enables the ECM to complete the SRT.
SRT ItemNEEC0031S0308The following table shows required self-diagnostic items to set the SRT to ªCMPLTº.
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Emission-related Diagnostic Information
EC-3051

SRT item
(CONSULT-II indica-
tion)Perfor-
mance Pri-
ority *Required self-diagnostic items to set the SRT to²CMPLT²Corresponding DTC
No.
CATALYST 3 Three way catalyst function P0420
HO2S 2 Heated oxygen sensor 1 P0132
Heated oxygen sensor 1 P0133
Heated oxygen sensor 1 P0134
Heated oxygen sensor 1 P1143
Heated oxygen sensor 1 P1144
Heated oxygen sensor 2 P0138
Heated oxygen sensor 2 P0139
Heated oxygen sensor 2 P1146
Heated oxygen sensor 2 P1147
HO2S HTR 1 Heated oxygen sensor 1 heater P0031, P0032
Heated oxygen sensor 2 heater P0037, P0038
*: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure) one by one based on the priority for
models with CONSULT-II.
SRT Set TimingNEEC0031S0310SRT is set as ªcompleteº after self-diagnosis has been performed one or more times. Completion of SRT will
occur if the result is OK or NG. The set timing is different between them and is shown in the following table.
Self-diagnosis result Example
DiagnosisIgnition
OFF±ON±
OFFIgnition
OFF±ON±
OFFIgnition
OFF±ON±
OFFIgnition
OFF±ON±OFF
All OK
Case 1P0400 OK (1) ± (1) OK (2) ± (2)
P0402 OK (1) ± (1) ± (1) OK (2)
P1402 OK (1) OK (2) ± (2) ± (2)
SRT of EGR ªcompleteº ªcompleteº ªcompleteº ªcompleteº
Case 2P0400 OK (1) ± (1) ± (1) ± (1)
P0402 ± (0) ± (0) OK (1) ± (1)
P1402 OK (1) OK (2) ± (2) ± (2)
SRT of EGR ªincompleteº ªincompleteº ªcompleteº ªcompleteº
NG exists
Case 3P0400 OK OK ± ±
P0402±±±±
P1402NG ± NG NG (Consecutive
NG)
(1st trip) DTC 1st trip DTC ± 1st trip DTC DTC (=MI ªONº)
SRT of EGR ªincompleteº ªincompleteº ªincompleteº ªcompleteº
OK: Self-diagnosis is carried out and the result is OK.
NG: Self-diagnosis is carried out and the result is OK.
± : Self-diagnosis is not carried out.
When all SRT related self-diagnoses showed OK results in a same cycle (Ignition OFF ± ON ± OFF), the SRT
will indicate ªcompleteº.
®Case 1 above
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Emission-related Diagnostic Information
EC-3052

When all SRT related self-diagnoses show OK results through several different cycles, the SRT will indicate
ªcompleteº at the time the respective self-diagnoses have at least one OK result.
®Case 2 above
If one or more SRT related self-diagnoses showed NG results in 2 consecutive cycles, the SRT will also indi-
cate ªcompleteº.
®Case 3 above
The previous table shows that the minimum number of cycles for setting SRT as ªincompleteº is one (1) for
each self-diagnosis (Case 1 and 2) or two (2) for one self-diagnosis (Case 3). However, in preparation for the
State emissions inspection, it is unnecessary of each self-diagnosis to be executed twice (Case 3) because
of the following reasons;
+The SRT will indicate ªcompleteº at the time the respective self-diagnoses have one (1) OK result.
+The emissions inspection requires ªcompleteº of the SRT only with OK self-diagnosis result.
+When, during SRT driving pattern, 1st trip DTC (NG) is detected prior to ªcompleteº of SRT, the self-diag-
nosis memory must be erased from ECM after repair.
+If the 1st trip DTC is erased, all the SRT will indicate ªincompleteº.
NOTE:
SRT can be set as ªcompleteº together with the DTC(s). Therefore, DTC check must always be carried out
prior to the State emission inspection even though the SRT indicates ªcompleteº.
How to Display SRT CodeNEEC0031S03011.With CONSULT-II
Selecting ªSRT STATUSº in ªDTC CONFIRMATIONº mode with CONSULT-II.
For items whose SRT codes are set, a ªCMPLTº is displayed on the CONSULT-II screen; for items whose
SRT codes are not set, ªINCMPº is displayed.
2.
With GST
Selecting Mode 1 with GST (Generic Scan Tool)
A sample of CONSULT-II display for SRT code is shown below.
ªINCMPº means the self-diagnosis is incomplete and SRT is not set. ªCMPLTº means the self-diagnosis is
complete and SRT is set.
SEC183C
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Emission-related Diagnostic Information
EC-3053

SRT Service Procedure=NEEC0031S0311If a vehicle has been rejected for the State emissions inspection due to one or more SRT items indicating
ªincompleteº, review the following flowchart diagnostic sequence.
SEF573XB
*1 EC-3050 *2 EC-3053 *3 EC-3055
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Emission-related Diagnostic Information
EC-3054

How to Set SRT Code=NEEC0031S0302To set all SRT codes, self-diagnosis for the items indicated above must be performed one or more times. Each
diagnosis may require a long period of actual driving under various conditions.
With CONSULT-II
Perform corresponding DTC confirmation procedure one by one based on ªPerformance Priorityº in the table
on EC-3051.
Without CONSULT-II
The most efficient driving pattern in which SRT codes can be properly set is explained on EC-3056. The driv-
ing pattern should be performed one or more times to set all SRT codes.
ON BOARD DIAGNOSTIC SYSTEM
DESCRIPTION
KA24DE (EURO OBD)
Emission-related Diagnostic Information
EC-3055