Infiniti M45 (Y34). Manual — part 341
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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*1: 1st trip DTC No. is the same as DTC No.
*2: These numbers are prescribed by SAE J2012.
*3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN.
*4: This is not displayed with GST.
*5: The trouble shooting for this DTC needs CONSULT-II.
*6: SRT code will not be set if the self-diagnostic results is NG.
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-
utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd
VENT CONTROL VALVE
P1448
1448
—
—
×
EVAP VERY SML LEAK
P1456
1456
×
*
6
×
×
*
4
FUEL LEVEL SEN/CIRC
P1464
1464
—
—
×
FAN CONT S/V CIRC
P1480
1480
—
—
—
VC/V BYPASS/V
P1490
1490
—
—
×
VC CUT/V BYPASS/V
P1491
1491
—
—
×
NATS MALFUNCTION
P1610 - P1615
1610 - 1615
—
—
×
P-N POS SW/CIRCUIT
P1706
1706
—
—
×
ATF TEMP SEN/CIRC
P1710
1710
—
—
×
TURBINE REV S/CIRC
P1716
1716
—
—
×
VSP SEN(A/T OUT)
P1720
1720
—
—
×
A/T INTERLOCK
P1730
1730
—
—
—
I/C SOLENOID/CIRC
P1752
1752
—
—
—
I/C SOLENOID FNCTN
P1754
1754
—
—
—
FR/B SOLENOID/CIRC
P1757
1757
—
—
—
FR/B SOLENOID/CIRC
P1759
1759
—
—
—
D/C SOLENOID/CIRC
P1762
1762
—
—
—
D/C SOLENOID FNCTN
P1764
1764
—
—
—
HLR/C SOL/CIRC
P1767
1767
—
—
—
HLR/C SOL FNCTN
P1769
1769
—
—
—
LC/B SOLENOID/CIRC
P1772
1772
—
—
—
LC/B SOLENOID FNCT
P1774
1774
—
—
—
SHIFT SIG FNCTN
P1780
1780
—
—
×
BRAKE SW/CIRCUIT
P1805
1805
—
—
×
APP SEN 1/CIRC
P2122
2122
—
—
—
APP SEN 1/CIRC
P2123
2123
—
—
—
APP SEN 2/CIRC
P2127
2127
—
—
—
APP SEN 2/CIRC
P2128
2128
—
—
—
TP SENSOR
P2135
2135
—
—
—
APP SENSOR
P2138
2138
—
—
—
Items
(CONSULT-II screen terms)
DTC*
1
SRT code
Test value/
Test limit
(GST only)
1st trip DTC
Reference
page
CONSULT-II
GST*
2
ECM*
3
EC-54
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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-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 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 Confir-
mation 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, P1148, P1706, etc.
These DTCs are prescribed by SAE J2012.
(CONSULT-II also displays the malfunctioning component or system.)
No Tools
The number of blinks of the MIL in the Diagnostic Test Mode II (Self-Diagnostic Results) indicates the DTC.
Example: 0340, 1148, 1706, etc.
These DTCs are controlled by NISSAN.
●
1st trip DTC No. is the same as DTC No.
●
Output of a DTC indicates a malfunction. However, GST or the Diagnostic Test Mode II do not indi-
cate whether the malfunction is still occurring or has occurred in the past and has returned to nor-
mal. 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, 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-54, "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
PBIB0911E
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-55
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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
.
SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Mode 1 of SAE J1979.
As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of
SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and com-
ponents. 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; 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.
SRT Item
The table below shows required self-diagnostic items to set the SRT to “CMPLT”.
Priority
Items
1
Freeze frame data
Misfire — DTC: P0300 - P0308
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
SRT item
(CONSULT-II indica-
tion)
Perfor-
mance Pri-
ority*
Required self-diagnostic items to set the SRT to “CMPLT”
Corresponding DTC
No.
CATALYST
2
Three way catalyst function
P0420, P0430
EVAP SYSTEM
1
EVAP control system
P0442, P1442
2
EVAP control system
P0456, P1456
2
EVAP control system purge flow monitoring
P0441
EC-56
ON BOARD DIAGNOSTIC (OBD) SYSTEM
*: 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.
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, P0159
Heated oxygen sensor 2
P1146, P1166
Heated oxygen sensor 2
P1147, P1167
HO2S HTR
2
Heated oxygen sensor 1 heater
P0031, P0032, P0051,
P0052
Heated oxygen sensor 2 heater
P0037, P0038, P0057,
P0058
SRT item
(CONSULT-II indica-
tion)
Perfor-
mance Pri-
ority*
Required self-diagnostic items to set the SRT to “CMPLT”
Corresponding DTC
No.
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