Nissan Pathfinder (2008 year). Manual — part 243
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-61
< FUNCTION 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
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EC-62
< FUNCTION DIAGNOSIS >
[VQ40DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
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
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-63
< FUNCTION 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
(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 value 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
(Bank 1)
Low Input:P0037
High Input:P0038
80H
0CH
Converted value of Heater electric
current to voltage
43H
Heated oxygen sensor 3
(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
(Bank 2)
Low Input:P0057
High Input:P0058
80H
0CH
Converted value of Heater electric
current to voltage
47H
Heated oxygen sensor 3
(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
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EC-64
< FUNCTION DIAGNOSIS >
[VQ40DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
FUEL
SYSTEM
81H
Fuel injection system function
(Bank 1)
P0171 or P0172
80H
2FH
Long term fuel trim
P0171 or P0172
81H
24H
The number of lambda control
clamped
82H
Fuel injection system function
(Bank 2)
P0174 or P0175
80H
2FH
Long term fuel trim
P0174 or P0175
81H
24H
The number of lambda control
clamped
MISFIRE
A1H
Multiple Cylinder Misfire
P0301
80H
24H
Misfiring counter at 1000rev of the
first cylinder
P0302
81H
24H
Misfiring counter at 1000rev of the
second cylinder
P0303
82H
24H
Misfiring counter at 1000rev of the
third cylinder
P0304
83H
24H
Misfiring counter at 1000rev of the
fourth cylinder
P0305
84H
24H
Misfiring counter at 1000rev of the
fifth cylinder
P0306
85H
24H
Misfiring counter at 1000rev of the
sixth cylinder
P0307
86H
24H
Misfiring counter at 1000rev of the
seventh cylinder
P0308
87H
24H
Misfiring counter at 1000rev of the
eighth cylinder
P0300
88H
24H
Misfiring counter at 1000rev of the
multiple cylinders
P0301
89H
24H
Misfiring counter at 200rev of the
first cylinder
P0302
8AH
24H
Misfiring counter at 200rev of the
second cylinder
P0303
8BH
24H
Misfiring counter at 200rev of the
third cylinder
P0304
8CH
24H
Misfiring counter at 200rev of the
fourth cylinder
P0305
8DH
24H
Misfiring counter at 200rev of the
fifth cylinder
P0306
8EH
24H
Misfiring counter at 200rev of the
fifth cylinder
P0307
8FH
24H
Misfiring counter at 200rev of the
fifth cylinder
P0308
90H
24H
Misfiring counter at 200rev of the
fifth cylinder
P0300
91H
24H
Misfiring counter at 1000rev of the
single cylinder
P0300
92H
24H
Misfiring counter at 200rev of the
single cylinder
P0300
93H
24H
Misfiring counter at 200rev of the
multiple cylinders
Item
OBD-
MID
Self-diagnostic test item
DTC
Test value and Test
limit
(GST display)
Description
TID
Unit and
Scaling
ID
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-65
< FUNCTION DIAGNOSIS >
[VQ40DE]
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HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION
How to Erase DTC
With CONSULT-III
The emission related diagnostic information in the ECM can be erased by selecting “ALL Erase” in the
“Description” of “FINAL CHECK” mode with CONSULT-III.
With GST
The emission related diagnostic information in the ECM can be erased by selecting Service $04 with GST.
NOTE:
If the DTC is not for A/T related items (see
), skip step 2.
MISFIRE
A2H
No.1 Cylinder Misfire
P0301
0BH
24H
EWMA (Exponential Weighted
Moving Average) misfire counts
for last 10 driving cycles
P0301
0CH
24H
Misfire counts for last/current driv-
ing cycles
A3H
No.2 Cylinder Misfire
P0302
0BH
24H
EWMA (Exponential Weighted
Moving Average) misfire counts
for last 10 driving cycles
P0302
0CH
24H
Misfire counts for last/current driv-
ing cycles
A4H
No.3 Cylinder Misfire
P0303
0BH
24H
EWMA (Exponential Weighted
Moving Average) misfire counts
for last 10 driving cycles
P0303
0CH
24H
Misfire counts for last/current driv-
ing cycles
A5H
No.4 Cylinder Misfire
P0304
0BH
24H
EWMA (Exponential Weighted
Moving Average) misfire counts
for last 10 driving cycles
P0304
0CH
24H
Misfire counts for last/current driv-
ing cycles
A6H
No.5 Cylinder Misfire
P0305
0BH
24H
EWMA (Exponential Weighted
Moving Average) misfire counts
for last 10 driving cycles
P0305
0CH
24H
Misfire counts for last/current driv-
ing cycles
A7H
No.6 Cylinder Misfire
P0306
0BH
24H
EWMA (Exponential Weighted
Moving Average) misfire counts
for last 10 driving cycles
P0306
0CH
24H
Misfire counts for last/current driv-
ing cycles
A8H
No.7 Cylinder Misfire
P0307
0BH
24H
EWMA (Exponential Weighted
Moving Average) misfire counts
for last 10 driving cycles
P0307
0CH
24H
Misfire counts for last/current driv-
ing cycles
A9H
No.8 Cylinder Misfire
P0308
0BH
24H
EWMA (Exponential Weighted
Moving Average) misfire counts
for last 10 driving cycles
P0308
0CH
24H
Misfire counts for last/current driv-
ing cycles
Item
OBD-
MID
Self-diagnostic test item
DTC
Test value and Test
limit
(GST display)
Description
TID
Unit and
Scaling
ID
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EC-66
< FUNCTION DIAGNOSIS >
[VQ40DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
1.
If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10
seconds and then turn it ON (engine stopped) again.
2.
. (The DTC in TCM will be erased.)
3.
Select Service $04 with GST (Generic Scan Tool).
No Tools
NOTE:
If the DTC is not for A/T related items (see
), skip step 2.
1.
If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once.
Wait at least 10 seconds and then turn it ON (engine stopped) again.
2.
. (The DTC in TCM will be erased.)
3.
Change the diagnostic test mode from Mode II to Mode I by depressing the accelerator pedal. Refer to
EC-66, "Malfunction Indicator Lamp (MIL)"
• If the battery is disconnected, the emission-related diagnostic information will be lost within 24
hours.
• The following data are cleared when the ECM memory is erased.
- Diagnostic trouble codes
- 1st trip diagnostic trouble codes
- Freeze frame data
- 1st trip freeze frame data
- System readiness test (SRT) codes
- Test values
Actual work procedures are explained using a DTC as an example. Be careful so that not only the DTC, but all
of the data listed above, are cleared from the ECM memory during work procedures.
Malfunction Indicator Lamp (MIL)
INFOID:0000000001366432
DESCRIPTION
The MIL is located on the instrument panel.
1.
The MIL will light up when the ignition switch is turned ON with-
out the engine running. This is a bulb check.
If the MIL does not light up, refer to
2.
When the engine is started, the MIL should go off.
If the MIL remains on, the on board diagnostic system has
detected an engine system malfunction.
ON BOARD DIAGNOSTIC SYSTEM FUNCTION
The on board diagnostic system has the following three functions.
SEF217U
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ON BOARD DIAGNOSTIC (OBD) SYSTEM
EC-67
< FUNCTION DIAGNOSIS >
[VQ40DE]
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When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there is
malfunction on engine control system.
Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected as
NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by means
of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the
driver to repair the malfunction.
MIL Flashing Without DTC
When any SRT codes are not set, MIL may flash without DTC. For the details, refer to
.
HOW TO SWITCH DIAGNOSTIC TEST MODE
NOTE:
• It is better to count the time accurately with a clock.
• It is impossible to switch the diagnostic mode when an accelerator pedal position sensor circuit has
a malfunction.
• Always ECM returns to Diagnostic Test Mode I after ignition switch is turned OFF.
How to Set Diagnostic Test Mode II (Self-diagnostic Results)
1.
Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
2.
Repeat the following procedure quickly five times within 5 seconds.
a.
Fully depress the accelerator pedal.
b.
Fully release the accelerator pedal.
3.
Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the MIL starts
blinking.
NOTE:
Do not release the accelerator pedal for 10 seconds if MIL may start blinking on the halfway of this
10 seconds. This blinking is displaying SRT status and is continued for another 10 seconds. For
the details, refer to
Diagnostic Test
Mode
KEY and ENG.
Status
Function
Explanation of Function
Mode I
Ignition switch in
ON position
Engine stopped
BULB CHECK
This function checks the MIL bulb for damage (blown, open
circuit, etc.).
If the MIL does not come on, check MIL circuit.
Engine running
MALFUNCTION
WARNING
This is a usual driving condition. When a malfunction is de-
tected twice in two consecutive driving cycles (two trip de-
tection logic), the MIL will light up to inform the driver that a
malfunction has been detected.
The following malfunctions will light up or blink the MIL in
the 1st trip.
• Misfire (Possible three way catalyst damage)
• One trip detection diagnoses
Mode II
Ignition switch in
ON position
Engine stopped
SELF-DIAGNOSTIC
RESULTS
This function allows DTCs and 1st trip DTCs to be read.
Engine operating condition in fail-safe mode
Engine speed will not rise more than 2,500 rpm due to the fuel cut
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EC-68
< FUNCTION DIAGNOSIS >
[VQ40DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
4.
Fully release the accelerator pedal.
ECM has entered to Diagnostic Test Mode II (Self-diagnostic results).
NOTE:
Wait until the same DTC (or 1st trip DTC) appears to confirm all DTCs certainly.
How to Erase Diagnostic Test Mode II (Self-diagnostic Results)
1.
Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to "How to Set Diagnostic Test Mode II
(Self-diagnostic Results)".
2.
Fully depress the accelerator pedal and keep it for more than 10 seconds.
The emission-related diagnostic information has been erased from the backup memory in the ECM.
3.
Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.
DIAGNOSTIC TEST MODE I — BULB CHECK
In this mode, the MIL on the instrument panel should stay ON. If it remains OFF, check the bulb. Refer to
DIAGNOSTIC TEST MODE I — MALFUNCTION WARNING
This DTC number is clarified in Diagnostic Test Mode II (SELF-DIAGNOSTIC RESULTS)
DIAGNOSTIC TEST MODE II — SELF-DIAGNOSTIC RESULTS
In this mode, the DTC and 1st trip DTC are indicated by the number of blinks of the MIL as shown below.
The DTC and 1st trip DTC are displayed at the same time. If the MIL does not illuminate in diagnostic test
mode I (Malfunction warning), all displayed items are 1st trip DTCs. If only one code is displayed when the MIL
illuminates in diagnostic test mode II (SELF-DIAGNOSTIC RESULTS), it is a DTC; if two or more codes are
displayed, they may be either DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These uniden-
PBIB0092E
MIL
Condition
ON
When the malfunction is detected.
OFF
No malfunction.
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