Nissan Pathfinder (2006 year). Instruction - part 149

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-51

2006 Pathfinder

*1: 1st trip DTC No. is the same as DTC No.
*2: This number is prescribed by SAE J2012.
*3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN.
*4: SRT code will not be set if the self-diagnostic result is NG.
*5: The troubleshooting for this DTC need CONSULT-II.
*6: When the fail-safe operations for both self-diagnoses occur at the same time, the MIL illuminates.
*7: When the ECM is in the mode of displaying SRT status, MIL may flash. For the details, refer to

EC-55, "How to Display SRT Status"

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
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

EC-60, "HOW

TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION"

For malfunctions in which 1st trip DTCs are displayed, refer to

EC-48, "EMISSION-RELATED DIAGNOSTIC

INFORMATION ITEMS"

. 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.

I/C SOLENOID FNCTN

P1754

1754

—

AT-147

FR/B SOLENOID/CIRC

P1757

1757

—

AT-149

FR/B SOLENOID/CIRC

P1759

1759

—

AT-151

D/C SOLENOID/CIRC

P1762

1762

—

AT-153

D/C SOLENOID FNCTN

P1764

1764

—

AT-155

HLR/C SOL/CIRC

P1767

1767

—

AT-157

HLR/C SOL FNCTN

P1769

1769

—

AT-159

LC/B SOLENOID/CIRC

P1772

1772

—

AT-161

LC/B SOLENOID FNCT

P1774

1774

—

AT-163

VIAS S/V CIRC

P1800

1800

—

EC-553

BRAKE SW/CIRCUIT

P1805

1805

—

EC-558

ETC MOT PWR

P2100

2100

—

EC-563

ETC FUNCTION/CIRC

P2101

2101

—

EC-569

ETC MOT PWR

P2103

2103

—

EC-563

ETC MOT

P2118

2118

—

EC-575

ETC ACTR

P2119

2119

—

EC-580

APP SEN 1/CIRC

P2122

2122

—

EC-582

APP SEN 1/CIRC

P2123

2123

—

EC-582

APP SEN 2/CIRC

P2127

2127

—

EC-588

APP SEN 2/CIRC

P2128

2128

—

EC-588

TP SENSOR

P2135

2135

—

EC-595

APP SENSOR

P2138

2138

—

EC-602

A/F SENSOR1 (B1)

P2A00

2A00

—

EC-609

A/F SENSOR1 (B2)

P2A03

2A03

—

EC-609

Items

(CONSULT-II screen terms)

DTC*

SRT code

Test value/

Test limit

(GST only)

Trip

MIL

Reference

page

CONSULT-II

GST*

ECM*

EC-52

ON BOARD DIAGNOSTIC (OBD) SYSTEM

2006 Pathfinder

1st trip DTC is specified in Service $07 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
vehicle 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 2, refer to

EC-82, "WORK FLOW"

. 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, P0850, P1148, 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, 0850, 1148, 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-116, "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-53

2006 Pathfinder

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

EC-60, "HOW TO ERASE EMIS-

SION-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 Instruction 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”.

*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-II.

Priority

Items

Freeze frame data

Misfire — DTC: P0300 - P0306
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175

Except the above items (Includes A/T related items)

1st trip freeze frame data

SRT item

(CONSULT-II indica-

tion)

Perfor-

mance Pri-

ority*1

Required self-diagnostic items to set the SRT to “CMPLT”

Corresponding DTC

No.

CATALYST

Three way catalyst function

P0420, P0430

EVAP SYSTEM

EVAP control system purge flow monitoring

P0441

EVAP control system

P0442

EVAP control system

P0456

HO2S

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

EC-54

ON BOARD DIAGNOSTIC (OBD) SYSTEM

2006 Pathfinder

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 showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT will
indicate “CMPLT”.

→

Case 1 above

When all SRT related self-diagnoses showed 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 showed NG results in 2 consecutive cycles, the SRT will also indi-
cate “CMPLT”.

→

Case 3 above

The table above shows that the minimum number of cycles for setting SRT as “INCMP” is one (1) for each
self-diagnosis (Case 1 & 2) or 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.

●

When, during SRT driving pattern, 1st trip DTC (NG) is detected prior to “CMPLT” of SRT, the self-diagno-
sis memory must be erased from 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

←

→

OFF

←

→

OFF

←

→

OFF

←

→

All OK

Case 1

P0400

OK (1)

— (1)

OK (2)

— (2)

P0402

OK (1)

— (1)

OK (2)

P1402

OK (1)

OK (2)

— (2)

SRT of EGR

“CMPLT”

Case 2

P0400

OK (1)

— (1)

P0402

— (0)

OK (1)

— (1)

P1402

OK (1)

OK (2)

— (2)

SRT of EGR

“INCMP”

“CMPLT”

NG exists

Case 3

P0400

—

P0402

—

P1402

—

(Consecutive

NG)

(1st trip)

DTC

1st trip DTC

—

1st trip DTC

DTC

(= MIL ON)

SRT of EGR

“INCMP”

“CMPLT”

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-55

2006 Pathfinder

How to Display SRT Status

WITH CONSULT-II

Selecting “SRT STATUS” in “DTC CONFIRMATION” mode with
CONSULT-II.
For items whose SRT codes are set, a “CMPLT” is displayed on the
CONSULT-II screen; for items whose SRT codes are not set,
“INCMP” is displayed.
A sample of CONSULT-II display for SRT code is shown at right.
“INCMP” means the self-diagnosis is incomplete and SRT is not set.
“CMPLT” means the self-diagnosis is complete and SRT is set.

NOTE:
Though displayed on the CONSULT-II screen, “HO2S HTR” is not
SRT item.

EC-52

EC-55

EC-56

PBIB2320E

SEF935Z

EC-56

ON BOARD DIAGNOSTIC (OBD) SYSTEM

2006 Pathfinder

WITH GST

Selecting Service $01 with GST (Generic Scan Tool)

NO TOOLS

A SRT code itself can no be displayed while only SRT status can be.

Turn ignition switch ON and wait 20 seconds.

SRT status is indicated as shown below.

●

When all SRT codes are set, MIL lights up continuously.

●

When any SRT codes are not set, MIL will flash 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-II

Perform corresponding DTC Confirmation Procedure one by one based on Performance Priority in the table
on

EC-53, "SRT Item"

WITHOUT CONSULT-II

The most efficient driving pattern in which SRT codes can be properly set is explained on the next page. The
driving pattern should be performed one or more times to set all SRT codes.

PBIB2317E

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-57

2006 Pathfinder

Driving Pattern

PBIB2906E

EC-58

ON BOARD DIAGNOSTIC (OBD) SYSTEM

2006 Pathfinder

●

The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driv-
ing habits, etc.
Zone A refers to the range where the time, required for the diagnosis under normal conditions*, is the
shortest.
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:

●

Sea level

●

Flat road

●

Ambient air temperature: 20 - 30

C (68 - 86

●

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)], diag-

nosis may also be performed.

Pattern 1:

●

The engine is started at the engine coolant temperature of

−

10 to 35

C (14 to 95

(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 con-
ducted. 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 (GST ONLY — NOT APPLICABLE TO CONSULT-II)

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 Test ID (TID) and Component ID (CID) and can be dis-
played on the GST screen.

PBIB2244E

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