Nissan Frontier D22. Instruction — part 237
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-51
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
EGRC-BPT VALVE
P0402
X
X
X*4
EGR TEMP SEN/CIRC
P0405
—
—
X
EGR TEMP SEN/CIRC
P0406
—
—
X
TW CATALYST SYS-B1
P0420
X
X
X*4
EVAP PURG FLOW/MON
P0441
X
X
X*4
EVAP SMALL LEAK
P0442
X
X
X*4
PURG VOLUME CONT/V
P0444
—
—
X
PURG VOLUME CONT/V
P0445
—
—
X
VENT CONTROL VALVE
P0447
—
—
X
EVAP SYS PRES SEN
P0452
—
—
X
EVAP SYS PRES SEN
P0453
—
—
X
EVAP GROSS LEAK
P0455
—
—
X
EVAP VERY SML LEAK
P0456
X*3
X
X*4
FUEL LEV SEN SLOSH
P0460
—
—
X
FUEL LEVEL SENSOR
P0461
—
—
X
FUEL LEVL SEN/CIRC
P0462
—
—
X
FUEL LEVL SEN/CIRC
P0463
—
—
X
VEH SPEED SEN/CIRC
P0500
—
—
X
ISC SYSTEM/CIRC
P0505
—
—
X
ISC SYSTEM
P0506
—
—
X
ISC SYSTEM
P0507
—
—
X
CLOSED TP SW/CIRC
P0510
—
—
X
ECM
P0605
—
—
X
HO2S1 (B1)
P1143
X
X
X*4
HO2S1 (B1)
P1144
X
X
X*4
HO2S2 (B1)
P1146
X
X
X*4
HO2S2 (B1)
P1147
X
X
X*4
CLOSED LOOP-B1
P1148
—
—
—
ENG OVER TEMP
P1217
—
—
—
CKP SENSOR (COG)
P1336
—
—
X
EGRC SOLENOID/V
P1400
—
—
X
EGR SYSTEM
P1402
X
X
X*4
EVAP SMALL LEAK
P1442
X
X
X*4
PURG VOLUME CONT/V
P1444
—
—
X
VENT CONTROL VALVE
P1446
—
—
X
VENT CONTROL VALVE
P1448
—
—
X
EVAP VERY SML LEAK
P1456
X*3
X
X*4
FUEL LEVEL SEN/CIRC
P1464
—
—
X
VC/V BYPASS/V
P1490
—
—
X
VC CUT/V BYPASS/V
P1491
—
—
X
P-N POS SW/CIRCUIT
P1706
—
—
X
Items
(CONSULT-II screen terms)
DTC*1*2
SRT code
Test value/
Test limit
(GST only)
1st trip DTC
Reference page
CONSULT-II
GST
EC-52
[KA24DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
*1: 1st trip DTC No. is the same as DTC No.
*2: These numbers are prescribed by SAE J2012.
*3: SRT code will not be set if the self-diagnostic results is NG.
*4: This is not displayed with GST.
*5: For the A/T models.
DTC AND 1ST TRIP DTC
The 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 MIL will not light up (two trip detection logic). If the same malfunction is not detected in the 2nd
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 MIL
lights up. In other words, the DTC is stored in the ECM memory and the MIL 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 MIL 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
ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION"
For malfunctions in which 1st trip DTCs are displayed, refer to
EC-50, "EMISSION-RELATED DIAGNOSTIC
. 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 SAE J1979. 1st trip DTC detection occurs without lighting up the MIL 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 “Work Flow” procedure Step II, refer to
firmation Procedure” or “Overall Function Check” to try to duplicate the problem. If the malfunction is dupli-
cated, the item requires repair.
How to read DTC and 1st Trip DTC
DTC 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, P1148, P1706, etc.
These DTCs are prescribed by SAE J2012.
(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 “0”.
If a 1st trip DTC is stored in the ECM, the time data will be “[1t]”.
TOR CONV CLTCH S/V
P1775*
5
—
—
X
TOR CONV CLTCH S/V
P1776*
5
—
—
X
Items
(CONSULT-II screen terms)
DTC*1*2
SRT code
Test value/
Test limit
(GST only)
1st trip DTC
Reference page
CONSULT-II
GST
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-53
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA
The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant tem-
perature, 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-103, "Freeze Frame Data and 1st Trip Freeze Frame Data"
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority
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/MIL 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.
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 mem-
ory is erased. Procedures for clearing the ECM memory are described in
SION-RELATED DIAGNOSTIC INFORMATION"
SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Mode 1 of SAE J1979.
As part of enhanced emissions test for Inspection and Maintenance (I/M), certain states require that the status
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 “INCMP”, use
the information in this service instruction to set the SRT to “CMPLT”.
In most cases, the ECM will automatically complete its self-diagnosis cycle during normal usage and the SRT
status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains
“CMPLT” 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 “INCMP” for these items.
NOTE:
The SRT will also indicate “INCMP” if the self-diagnosis memory is erased for any reason or if the ECM mem-
ory power supply is interrupted for several hours.
PBIB0911E
Priority
Items
1
Freeze frame data
Misfire — DTC: P0300 - P0304
Fuel Injection System Function — DTC: P0171, P0172
2
Except the above items
3
1st trip freeze frame data
EC-54
[KA24DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
If, during the state emissions inspection, the SRT indicates “CMPLT” for all test items, the inspector will con-
tinue with the emissions test. However, if the SRT indicates “CMPLT” for one or more of the SRT items, the
vehicle is returned to the customer untested.
NOTE:
If MIL is ON during the state emissions inspection, the vehicle is also returned to the customer untested even
though the SRT indicates “CMPLT” for all test items. Therefore, it is important to check SRT (“CMPLT”) and
DTC (No DTCs) before the inspection.
This service instruction contains the service procedure and support information to perform a comprehensive road
test that enables the ECM to complete the SRT.
SRT Item
The following table shows required self-diagnostic items to set the SRT to “CMPLT”.
*: 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 item
(CONSULT-II indica-
tion)
Perfor-
mance
Priority *
Required self-diagnostic items to set the SRT to “CMPLT”
Corresponding DTC
No.
CATALYST
2
Three way catalyst function
P0420
EVAPORATIVE SYS-
TEM
1
EVAP control system
P0442,P1442
2
EVAP control system
P0456, P1456
2
EVAP control system purge flow monitoring
P0441
HO2S
2
Heated oxygen sensor 1
P0133
Heated oxygen sensor 1
P1143
Heated oxygen sensor 1
P1144
Heated oxygen sensor 2
P0139
Heated oxygen sensor 2
P1147
Heated oxygen sensor 2
P1146
HO2S HTR
2
Heated oxygen sensor 1 heater
P0031, P0032
Heated oxygen sensor 2 heater
P0037, P0038
EGR SYSTEM
3
EGR function
P0400
EGRC-BPT valve function
P0402
1
EGR function
P1402
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