Nissan Pathfinder (2009 year). Manual — part 306
EC-462
< ECU DIAGNOSIS >
[VQ40DE]
ECM
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.
• 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.
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
ECM
EC-463
< ECU DIAGNOSIS >
[VQ40DE]
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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.
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.
*1
"How to Read DTC and 1st Trip DTC" *2
"How to Display SRT Status"
*3
"How to Set SRT Code"
PBIB2320E
2009 Pathfinder
EC-464
< ECU DIAGNOSIS >
[VQ40DE]
ECM
• 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.
PBIB2317E
2009 Pathfinder
ECM
EC-465
< ECU DIAGNOSIS >
[VQ40DE]
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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
EC-466
< ECU DIAGNOSIS >
[VQ40DE]
ECM
• 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
ECM
EC-467
< ECU DIAGNOSIS >
[VQ40DE]
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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
EC-468
< ECU DIAGNOSIS >
[VQ40DE]
ECM
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
ECM
EC-469
< ECU DIAGNOSIS >
[VQ40DE]
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EGR
SYSTEM
31H
EGR function
P0400
80H
96H
Low Flow Faults: EGR temp
change rate (short term)
P0400
81H
96H
Low Flow Faults: EGR temp
change rate (long term)
P0400
82H
96H
Low Flow Faults: Difference be-
tween max EGR temp and EGR
temp under idling condition
P0400
83H
96H
Low Flow Faults: Max EGR temp
P1402
84H
96H
High Flow Faults: EGR temp in-
crease rate
EVAP
SYSTEM
39H
EVAP control system leak
(Cap Off)
P0455
80H
0CH
Difference in pressure sensor out-
put voltage before and after pull
down
3BH
EVAP control system leak
(Small leak)
P0442
80H
05H
Leak area index (for more than
0.04inch)
3CH
EVAP control system leak
(Very small leak)
P0456
80H
05H
Leak area index (for more than
0.02inch)
P0456
81H
FDH
Maximum internal pressure of
EVAP system during monitoring
3DH
Purge flow system
P0441
83H
0CH
Difference in pressure sensor out-
put voltage before and after vent
control valve close
O2 SEN-
SOR
HEATER
41H
A/F sensor 1 heater
(Bank 1)
Low Input:P0031
High Input:P0032
81H
0BH
Converted value of Heater electric
current to voltage
42H
Heated oxygen sensor 2 heat-
er (Bank 1)
Low Input:P0037
High Input:P0038
80H
0CH
Converted value of Heater electric
current to voltage
43H
Heated oxygen sensor 3 heat-
er (Bank 1)
P0043
80H
0CH
Converted value of Heater electric
current to voltage
45H
A/F sensor 1 heater
(Bank 2)
Low Input:P0051
High Input:P0052
81H
0BH
Converted value of Heater electric
current to voltage
46H
Heated oxygen sensor 2 heat-
er (Bank 2)
Low Input:P0057
High Input:P0058
80H
0CH
Converted value of Heater electric
current to voltage
47H
Heated oxygen sensor 3 heat-
er (Bank 2)
P0063
80H
0CH
Converted value of Heater electric
current to voltage
SEC-
OND-
ARY AIR
71H
Secondary Air system
P0411
80H
01H
Secondary Air Injection System
Incorrect Flow Detected
Bank1: P0491
Bank2: P0492
81H
01H
Secondary Air Injection System
Insufficient Flow
P2445
82H
01H
Secondary Air Injection System
Pump Stuck Off
P2448
83H
01H
Secondary Air Injection System
High Airflow
Bank1: P2440
Bank2: P2442
84H
01H
Secondary Air Injection System
Switching Valve Stuck Open
P2440
85H
01H
Secondary Air Injection System
Switching Valve Stuck Open
P2444
86H
01H
Secondary Air Injection System
Pump Stuck On
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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