Nissan Pathfinder (2009 year). Manual — part 255
EC-54
< FUNCTION DIAGNOSIS >
[VQ40DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Data which are saved in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, saved together with the DTC data, are called freeze frame data and displayed on CONSULT-III or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT-III screen, not on the GST. For
details, see
EC-73, "CONSULT-III Function (ENGINE)"
.
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be saved in the
ECM. 1st trip freeze frame data is saved 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 saved in the ECM memory, 1st trip freeze frame data is no
longer saved. Remember, only one set of freeze frame data can be saved 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 saved 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
saved in the ECM memory, 1st trip freeze data is no longer saved (because only one freeze frame data or 1st
trip freeze frame data can be saved in the ECM). If freeze frame data is saved 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 "HOW TO ERASE EMISSION-
RELATED DIAGNOSTIC INFORMATION".
SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Service $01 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 - 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
SRT item
(CONSULT-III indica-
tion)
Perfor-
mance Pri-
ority*1
Required self-diagnostic items to set the SRT to “CMPLT”
Corresponding DTC No.
CATALYST
2
Three way catalyst function
P0420, P0430
2009 Pathfinder
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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*1: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by one based on the priority for
models with CONSULT-III.
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 NG.
—: Self-diagnosis is not carried out.
When all SRT related self-diagnoses show OK results in a single 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
If one or more SRT related self-diagnoses show NG results in 2 consecutive cycles, the SRT will also indicate
“CMPLT”.
→
Case 3 above
The table above shows that the minimum number of cycles for setting SRT as “INCMP” is one the number (1)
for each self-diagnosis (Case 1 & 2) or the number two (2) for one of self-diagnoses (Case 3). However, in
preparation for the state emissions inspection, it is unnecessary for each self-diagnosis to be executed twice
(Case 3) for the following reasons:
• The SRT will indicate “CMPLT” at the time the respective self-diagnoses have one (1) OK result.
• The emissions inspection requires “CMPLT” of the SRT only with OK self-diagnosis results.
EVAP SYSTEM
2
EVAP control system purge flow monitoring
P0441
1
EVAP control system
P0442
2
EVAP control system
P0456
HO2S
1
Air fuel ratio (A/F) sensor 1
P0133, P0153
Heated oxygen sensor 2
P0137, P0157
Heated oxygen sensor 2
P0138, P0158
Heated oxygen sensor 2
P0139, P0159
SRT item
(CONSULT-III indica-
tion)
Perfor-
mance Pri-
ority*1
Required self-diagnostic items to set the SRT to “CMPLT”
Corresponding DTC No.
Self-diagnosis result
Example
Diagnosis
Ignition cycle
←
ON
→
OFF
←
ON
→
OFF
←
ON
→
OFF
←
ON
→
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
(Consecutive
NG)
(1st trip)
DTC
1st trip DTC
—
1st trip DTC
DTC
(= MIL ON)
SRT of EGR
“INCMP”
“INCMP”
“INCMP”
“CMPLT”
2009 Pathfinder
EC-56
< FUNCTION DIAGNOSIS >
[VQ40DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
• During SRT driving pattern, the 1st trip DTC (NG) is detected prior to “CMPLT” of SRT and the self-diagnosis
memory must be erased from the ECM after repair.
• If the 1st trip DTC is erased, all the SRT will indicate “INCMP”.
NOTE:
SRT can be set as “CMPLT” together with the DTC(s). Therefore, DTC check must always be carried out
prior to the state emission inspection even though the SRT indicates “CMPLT”.
SRT Service Procedure
If a vehicle has failed the state emissions inspection due to one or more SRT items indicating “INCMP”, review
the flowchart diagnostic sequence on the next page.
How to Display SRT Status
WITH CONSULT-III
Selecting “SRT STATUS” in “DTC & SRT CONFIRMATION” mode with CONSULT-III.
For items whose SRT codes are set, “CMPLT” is displayed on the CONSULT-III screen; for items whose SRT
codes are not set, “INCMP” is displayed.
NOTE:
Though displayed on the CONSULT-III screen, “HO2S HTR” is not SRT item.
*1
"How to Read DTC and 1st Trip DTC" *2
"How to Display SRT Status"
*3
"How to Set SRT Code"
PBIB2320E
2009 Pathfinder
ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-57
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WITH GST
Selecting Service $01 with GST (Generic Scan Tool)
NO TOOLS
A SRT code itself cannot be displayed however only SRT status can.
1.
Turn ignition switch ON and wait 20 seconds.
2.
SRT status is indicated as shown below.
• When all SRT codes are set, MIL illuminates continuously.
• When any SRT codes are not set, MIL will blink periodically for 10 seconds.
How to Set SRT Code
To 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-III
Perform corresponding DTC Confirmation Procedure one by one based on Performance Priority in the table
on "SRT Item".
WITHOUT CONSULT-III
The most efficient driving pattern in which SRT codes can be properly set is explained below. The driving pat-
tern should be performed one or more times to set all SRT codes.
JMBIA1515GB
2009 Pathfinder
EC-58
< FUNCTION DIAGNOSIS >
[VQ40DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Driving Pattern
• The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driving
habits, etc.
Zone A refers to the range where the time, required for the diagnosis under normal conditions*, is the short-
est.
Zone B refers to the range where the diagnosis can still be performed if the diagnosis is not completed within
zone A.
*: Normal conditions refer to the following:
PBIB3622E
2009 Pathfinder
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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• Sea level
• Flat road
• Ambient air temperature: 20 - 30
°
C (68 - 86
°
F)
• Diagnosis is performed as quickly as possible under normal conditions.
Under different conditions [For example: ambient air temperature other than 20 - 30
°
C (68 - 86
°
F)], diagno-
sis may also be performed.
Pattern 1:
• The engine is started at the engine coolant temperature of
−
10 to 35
°
C (14 to 95
°
F)
(where the voltage between the ECM terminal 73 and ground is 3.0 - 4.3V).
• The engine must be operated at idle speed until the engine coolant temperature is greater than 70
°
C
(158
°
F) (where the voltage between the ECM terminal 73 and ground is lower than 1.4V).
• The engine is started at the fuel tank temperature of warmer than 0
°
C (32
°
F) (where the voltage
between the ECM terminal 107 and ground is less than 4.1V).
Pattern 2:
• When steady-state driving is performed again even after it is interrupted, each diagnosis can be conducted.
In this case, the time required for diagnosis may be extended.
Pattern 3:
• Operate vehicle following the driving pattern shown in the figure.
• Replace the accelerator pedal during decelerating vehicle speed
from 90km/h (56MPH) to 0km/h (0MPH).
Pattern 4:
• The accelerator pedal must be held very steady during steady-
state driving.
• If the accelerator pedal is moved, the test must be conducted all
over again.
*1: Depress the accelerator pedal until vehicle speed is 90 km/h (56
MPH), then release the accelerator pedal and keep it released for
more than 10 seconds. Depress the accelerator pedal until vehicle
speed is 90 km/h (56 MPH) again.
*2: Checking the vehicle speed with GST is advised.
Suggested Transmission Gear Position
Set the selector lever in the D position with the overdrive switch turned ON.
TEST VALUE AND TEST LIMIT
The following is the information specified in Service $06 of SAE J1979.
The test value is a parameter used to determine whether a system/circuit diagnostic test is OK or NG while
being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the
maximum or minimum value and is compared with the test value being monitored.
These data (test value and test limit) are specified by On Board Monitor ID(OBDMID), Test ID (TID), Unit and
Scaling ID and can be displayed on the GST screen.
The items of the test value and test limit will be displayed with GST screen which items are provided by the
ECM. (e.g., if bank 2 is not applied on this vehicle, only the items of bank 1 are displayed)
PBIB2244E
2009 Pathfinder
EC-60
< FUNCTION DIAGNOSIS >
[VQ40DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Item
OBD-
MID
Self-diagnostic test item
DTC
Test value and Test
limit
(GST display)
Description
TID
Unit and
Scaling
ID
HO2S
01H
Air fuel ratio (A/F) sensor 1
(Bank 1)
P0131
83H
0BH
Minimum sensor output voltage
for test cycle
P0131
84H
0BH
Maximum sensor output voltage
for test cycle
P0130
85H
0BH
Minimum sensor output voltage
for test cycle
P0130
86H
0BH
Maximum sensor output voltage
for test cycle
P0133
87H
04H
Response rate: Response ratio
(Lean to Rich)
P0133
88H
04H
Response rate: Response ratio
(Rich to Lean)
P2A00
89H
84H
The amount of shift in air fuel ratio
P2A00
8AH
84H
The amount of shift in air fuel ratio
P0130
8BH
0BH
Difference in sensor output volt-
age
P0133
8CH
83H
Response gain at the limited fre-
quency
02H
Heated oxygen sensor 2
(Bank 1)
P0138
07H
0CH
Minimum sensor output voltage
for test cycle
P0137
08H
0CH
Maximum sensor output voltage
for test cycle
P0138
80H
0CH
Sensor output voltage
P0139
81H
0CH
Difference in sensor output volt-
age
03H
Heated oxygen sensor 3
(Bank 1)
P0143
07H
0CH
Minimum sensor output voltage
for test cycle
P0144
08H
0CH
Maximum sensor output voltage
for test cycle
P0146
80H
0CH
Sensor output voltage
P0145
81H
0CH
Difference in sensor output volt-
age
2009 Pathfinder
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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< FUNCTION DIAGNOSIS >
[VQ40DE]
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HO2S
05H
Air fuel ratio (A/F) sensor 1
(Bank 2)
P0151
83H
0BH
Minimum sensor output voltage
for test cycle
P0151
84H
0BH
Maximum sensor output voltage
for test cycle
P0150
85H
0BH
Minimum sensor output voltage
for test cycle
P0150
86H
0BH
Maximum sensor output voltage
for test cycle
P0153
87H
04H
Response rate: Response ratio
(Lean to Rich)
P0153
88H
04H
Response rate: Response ratio
(Rich to Lean)
P2A03
89H
84H
The amount of shift in air fuel ratio
P2A03
8AH
84H
The amount of shift in air fuel ratio
P0150
8BH
0BH
Difference in sensor output volt-
age
P0153
8CH
83H
Response gain at the limited fre-
quency
06H
Heated oxygen sensor 2
(Bank 2)
P0158
07H
0CH
Minimum sensor output voltage
for test cycle
P0157
08H
0CH
Maximum sensor output voltage
for test cycle
P0158
80H
0CH
Sensor output voltage
P0159
81H
0CH
Difference in sensor output volt-
age
07H
Heated oxygen sensor 3
(Bank2)
P0163
07H
0CH
Minimum sensor output voltage
for test cycle
P0164
08H
0CH
Maximum sensor output voltage
for test cycle
P0166
80H
0CH
Sensor output voltage
P0165
81H
0CH
Difference in sensor output volt-
age
CATA-
LYST
21H
Three way catalyst function
(Bank1)
P0420
80H
01H
O2 storage index
P0420
82H
01H
Switching time lag engine exhaust
index value
P2423
83H
0CH
Difference in 3rd O2 sensor out-
put voltage
P2423
84H
84H
O2 storage index in HC trap cata-
lyst
22H
Three way catalyst function
(Bank2)
P0430
80H
01H
O2 storage index
P0430
82H
01H
Switching time lag engine exhaust
index value
P2424
83H
0CH
Difference in 3rd O2 sensor out-
put voltage
P2424
84H
84H
O2 storage index in HC trap cata-
lyst
Item
OBD-
MID
Self-diagnostic test item
DTC
Test value and Test
limit
(GST display)
Description
TID
Unit and
Scaling
ID
2009 Pathfinder
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