Nissan Frontier D22. Manual — part 530
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-1223
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
*1: 1st trip DTC No. is the same as DTC No.
*2: This number is prescribed by SAE J2012.
*3: SRT code will not be set if the self-diagnostic result is NG.
*4: This is not displayed with GST.
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 malfunction 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 malfunction occurs in two consec-
A/T 3RD GR FNCTN
P0733
—
—
×
A/T 4TH GR FNCTN
P0734
—
—
×
TCC SOLENOID/CIRC
P0740
—
—
×
A/T TCC S/V FNCTN
P0744
—
—
×
L/PRESS SOL/CIRC
P0745
—
—
×
SFT SOL A/CIRC
P0750
—
—
×
SFT SOL B/CIRC
P0755
—
—
×
HO2S1 (B1)
P1143
×
×
×*
4
HO2S1 (B1)
P1144
×
×
×*
4
HO2S2 (B1)
P1146
×
×
×*
4
HO2S2 (B1)
P1147
×
×
×*
4
CLOSED LOOP-B1
P1148
—
—
—
HO2S1 (B2)
P1163
×
×
×*
4
HO2S1 (B2)
P1164
×
×
×*
4
HO2S2 (B2)
P1166
×
×
×*
4
HO2S2 (B2)
P1167
×
×
×*
4
CLOSED LOOP-B2
P1168
—
—
×
ENG OVER TEMP
P1217
—
—
×
CKP SENSOR (COG)
P1336
—
—
×
EVAP SMALL LEAK
P1442
×
×
×*
4
PURG VOLUME CONT/V
P1444
—
—
×
VENT CONTROL VALVE
P1446
—
—
×
VENT CONTROL VALVE
P1448
—
—
×
EVAP VERY SML LEAK
P1456
×*
3
×
×*
4
FUEL LEVEL SEN/CIRC
P1464
—
—
×
VC/V BYPASS/V
P1490
—
—
×
VC CUT/V BYPASS/V
P1491
—
—
×
A/T DIAG COMM LINE
P1605
—
—
×
TP SEN/CIRC A/T
P1705
—
—
×
P-N POS SW/CIRCUIT
P1706
—
—
×
O/R CLTCH SOL/CIRC
P1760
—
—
×
Items
(CONSULT-II screen terms)
DTC*
1
*
2
SRT code
Test value/
Test limit
(GST only)
1st trip DTC*
1
Reference page
CONSULT-II
GST
EC-1224
[VG33ER]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
utive 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 in
TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION"
For malfunctions in which 1st trip DTCs are displayed, refer to
EC-1221, "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 malfunction. However, 1st trip DTC detection will not prevent the vehi-
cle 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
. Then perform DTC Con-
firmation Procedure or Overall Function Check to try to duplicate the malfunction. 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, P0705, P0750, 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 do 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 available) is recommended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown below. DTC or 1st trip DTC of a malfunc-
tion 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].
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 and absolute pressure 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-1279, "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.
PBIB0911E
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-1225
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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 manual 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.
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 “INCMP” 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.
Priority
Items
1
Freeze frame data
Misfire — DTC: P0300 - P0306
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175
2
Except the above items (Includes A/T related items)
3
1st trip freeze frame data
EC-1226
[VG33ER]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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 Set Timing
SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRT is
done regardless of whether the result is OK or NG. The set timing is different between OK and NG results and
is shown in the table below.
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 “CMPLT”.
→ Case 1 above
When all SRT related self-diagnoses show OK results through several different cycles, the SRT will indicate
“CMPLT” at the time the respective self-diagnoses have at least one OK result.
→ Case 2 above
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, P0430
EVAPRATIVE SYSTEM
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, P0153
Heated oxygen sensor 1
P1143, P1163
Heated oxygen sensor 1
P1144, P1164
Heated oxygen sensor 2
P0139, P0157
Heated oxygen sensor 2
P1146, P1166
Heated oxygen sensor 2
P1147, P1167
HO2S HEATER
2
Heated oxygen sensor 1 heater
P0031, P0032, P0051,
P0052
Heated oxygen sensor 2 heater
P0037, P0038, P0057,
P0058
Self-diagnosis result
Example
Diagnosis
Ignition
OFF – ON –
OFF
Ignition
OFF – ON –
OFF
Ignition
OFF – ON –
OFF
Ignition
OFF – ON – OFF
All OK
Case 1
P0400
OK (1)
– (1)
OK (2)
– (2)
P0402
OK (1)
– (1)
– (1)
OK (2)
P1402
OK (1)
OK (2)
– (2)
– (2)
SRT of EGR
“CMPLT”
“CMPLT”
“CMPLT”
“CMPLT”
Case 2
P0400
OK (1)
– (1)
– (1)
– (1)
P0402
– (0)
– (0)
OK (1)
– (1)
P1402
OK (1)
OK (2)
– (2)
– (2)
SRT of EGR
“INCMP”
“INCMP”
“CMPLT”
“CMPLT”
NG exists
Case 3
P0400
OK
OK
–
–
P0402
–
–
–
–
P1402
NG
–
NG
NG (Consecu-
tive NG)
(1st trip) DTC
1st trip DTC
–
1st trip DTC
DTC (=MIL “ON”)
SRT of EGR
“INCMP”
“INCMP”
“INCMP”
“CMPLT”
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