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Nissan Pathfinder (2010 year). Manual - part 245

EC-52

< FUNCTION DIAGNOSIS >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Introduction

INFOID:0000000005257047

The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-

tors. The ECM also records various emission-related diagnostic information including:

*: Service $0A is not applied for regions where it is not mandated.

The above information can be checked using procedures listed in the table below.

: Applicable —: Not applicable

*: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.

The malfunction indicator lamp (MIL) on the instrument panel illuminates when the same malfunction is

detected in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to

EC-458

Two Trip Detection Logic

INFOID:0000000005257048

When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are saved in the

ECM memory. The MIL will not illuminate at this stage. <1st trip>

If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are saved in

the ECM memory, and the MIL illuminates. The MIL illuminates at the same time the DTC is saved. <2nd trip>

The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed during

vehicle operation. Specific on board diagnostic items will cause the ECM to illuminate or blink the MIL, and

save DTC and Freeze Frame data, even in the 1st trip, as shown below.

: Applicable —: Not applicable

Emission-related diagnostic information

SAE Mode

Diagnostic Trouble Code (DTC)

Service $03 of SAE J1979/ISO 15031-5

Freeze Frame data

Service $02 of SAE J1979/ISO 15031-5

System Readiness Test (SRT) code

Service $01 of SAE J1979/ISO 15031-5

1st Trip Diagnostic Trouble Code (1st Trip DTC)

Service $07 of SAE J1979/ISO 15031-5

1st Trip Freeze Frame data

—

Test values and Test limits

Service $06 of SAE J1979/ISO 15031-5

Calibration ID

Service $09 of SAE J1979/ISO 15031-5

Permanent Diagnostic Trouble Code (Permanent DTC)

Service $0A* of SAE J1979/ISO 15031-5

DTC

1st trip DTC

Freeze

Frame

data

1st trip Freeze

Frame data

SRT code

SRT status

Test value

Permanent

DTC status

CONSULT-III

—

GST

—

ECM

—

Items

MIL

DTC

1st trip DTC

1st trip

2nd trip

1st trip

displaying

2nd trip

displaying

1st trip

displaying

2nd trip

display-

ing

Blinking

Illuminat-

Blinking

Illuminat-

Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0306 is
being detected

—

Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0306 is
being detected

—

One trip detection diagnoses (Re-
fer to

EC-461

—

Except above

—

2010 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-53

< FUNCTION DIAGNOSIS >

[VQ40DE]

When there is an open circuit on MIL circuit, the ECM cannot warn the driver by illuminating 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.

Emission-related Diagnostic Information

INFOID:0000000005257049

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 saved in the ECM memory. The MIL will not

illuminate (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 saved in the ECM memory and the MIL illuminates. In other words,

the DTC is saved in the ECM memory and the MIL illuminates when the same malfunction occurs in two con-

secutive trips. If a 1st trip DTC is saved and a non-diagnostic operation is performed between the 1st and 2nd

trips, only the 1st trip DTC will continue to be saved. For malfunctions that blink or illuminate the MIL during

the 1st trip, the DTC and 1st trip DTC are saved in the ECM memory.

Procedures for clearing the DTC and the 1st trip DTC from the ECM memory are described in "HOW TO

ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION".

For malfunctions in which 1st trip DTCs are displayed, refer to "EMISSION-RELATED DIAGNOSTIC INFOR-

MATION ITEMS". These items are required by legal regulations to continuously monitor the system/compo-

nent. In addition, the items monitored non-continuously are also displayed on CONSULT-III.

1st trip DTC is specified in Service $07 of SAE J1979/ISO 15031-5. 1st trip DTC detection occurs without illu-

minating 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-14, "Trouble Diagnosis Introduction"

. Then per-

form DTC Confirmation Procedure or Overall Function Check to try to duplicate the malfunction. If the mal-

function is duplicated, 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-III

With GST

CONSULT-III or GST (Generic Scan Tool) Examples: P0340, P0850, P1148, etc.

These DTCs are prescribed by SAE J2012/ISO 15031-6.

(CONSULT-III 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 and 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-III can identify malfunction status as shown below. Therefore, using CONSULT-III (if

available) is recommended.

DTC or 1st trip DTC of a malfunction is displayed in SELF-DIAGNOSTIC RESULTS mode of CONSULT-III.

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 saved in the ECM, the time data will be [1t].

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA

Engine operating condition in fail-safe mode

Engine speed will not rise more than 2,500 rpm due to the fuel cut

2010 Pathfinder

EC-54

< FUNCTION DIAGNOSIS >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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, absolute throttle position, base

fuel schedule and intake air temperature at the moment a malfunction is detected.

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-79, "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/ISO 15031-5.

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 permanent DTC is stored or MIL illuminates 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”), DTC (No DTCs) and permanent DTC (No permanent DTCs) before the

inspection.

SRT Item

The table below shows required self-diagnostic items to set the SRT to “CMPLT”.

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

2010 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-55

< FUNCTION DIAGNOSIS >

[VQ40DE]

*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:

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

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

EGR/VVT SYSTEM

Intake value timing control function

P0011, P0021

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”

2010 Pathfinder

EC-56

< FUNCTION DIAGNOSIS >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

• 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.

How to Display SRT Status

WITH CONSULT-III

Selecting “SRT STATUS” in “DTC 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.

JSBIA0065GB

2010 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-57

< FUNCTION DIAGNOSIS >

[VQ40DE]

• “SRT STATUS” provides the presence or absence of permanent DTCs stored in ECM memory.

WITH GST

Selecting Service $01 with GST (Generic Scan Tool)

NO TOOLS

A SRT code itself cannot be displayed, however 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

2010 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:

JSBIA0162GB

2010 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-59

< FUNCTION DIAGNOSIS >

[VQ40DE]

• 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)], 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

(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

(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:

• Operate vehicle, following the driving pattern shown in the figure.

- Drive the vehicle in a proper gear at 60 km/h (38 MPH) and main-

tain the speed.

- Release the accelerator pedal fully at least 5 seconds.

- Repeat the above two steps at least 5 times.

Pattern 5:

• 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.

PERMANENT DIAGNOSTIC TROUBLE CODE (PERMANENT DTC)

Permanent DTC is defined in SAE J1979/ISO 15031-5 Service $0A.

ECM stores a DTC issuing a command of turning on MIL as a permanent DTC and keeps storing the DTC as

a permanent DTC until ECM judges that there is no presence of malfunction.

PBIB2244E

JSBIA0160GB

2010 Pathfinder

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