Content .. 250 251 252 253 ..

Nissan Pathfinder (2011 year). Manual - part 252

EC-70

< SYSTEM DESCRIPTION >

[VQ40DE]

DIAGNOSIS SYSTEM (ECM)

Driving Pattern C

Refer to

EC-71, "DIAGNOSIS DESCRIPTION : Driving Pattern"

Example:

If the stored freeze frame data is as per the following:

Engine speed: 850 rpm, Calculated load value: 30%, Engine coolant temperature: 80

C (176

To be satisfied with driving pattern C, the vehicle should run under the following conditions:

Engine speed: 475 – 1,225 rpm, Calculated load value: 27 – 33%, Engine coolant temperature: more than

C (158

Relationship Between MIL, DTC, 1st Trip DTC and Driving Patterns Except For “Misfire <Exhaust
Quality Deterioration>”, “Fuel Injection System”

JMBIA1418GB

2011 Pathfinder

DIAGNOSIS SYSTEM (ECM)

EC-71

< SYSTEM DESCRIPTION >

[VQ40DE]

Explanation for Driving Patterns Except for “Misfire <Exhaust Quality Deterioration>”, “Fuel Injection
System”

Driving Pattern A

Refer to

EC-71, "DIAGNOSIS DESCRIPTION : Driving Pattern"

Driving Pattern B

Refer to

EC-71, "DIAGNOSIS DESCRIPTION : Driving Pattern"

DIAGNOSIS DESCRIPTION : Driving Pattern

INFOID:0000000006709461

CAUTION:

Always drive at a safe speed.

DRIVING PATTERN A

Driving pattern A means a trip satisfying the following conditions.

• Engine speed reaches 400 rpm or more.

• Engine coolant temperature rises by 20

C (36

F) or more after starting the engine.

• Engine coolant temperature reaches 70

C (158

F) or more.

• The ignition switch is turned from ON to OFF.

NOTE:

• When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern

• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving

pattern A.

DRIVING PATTERN B

Driving pattern B means a trip satisfying the following conditions.

• Engine speed reaches 400 rpm or more.

• Engine coolant temperature reaches 70

C (158

F) or more.

• Vehicle speed of 70 – 120 km/h (44 – 75 MPH) is maintained for 60 seconds or more under the control of

closed loop.

• Vehicle speed of 30 – 60 km/h (19 – 37 MPH) is maintained for 10 seconds or more under the control of

closed loop.

• Under the closed loop control condition, the following state reaches 12 seconds or more in total: Vehicle

speed of 4 km/h (2 MPH) or less with idling condition.

• The state of driving at 10 km/h (7 MPH) or more reaches 10 minutes or more in total.

• A lapse of 22 minutes or more after engine start.

NOTE:

• Drive the vehicle at a constant velocity.

• When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern

• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving

pattern B.

DRIVING PATTERN C

Driving pattern C means operating vehicle as per the following:

The following conditions should be satisfied at the same time:

Engine speed: (Engine speed in the freeze frame data)

375 rpm

*1: When the same malfunction is de-

tected in two consecutive trips, MIL
will light up.

*2: MIL will turn OFF after vehicle is driv-

en 3 times (pattern B) without any
malfunctions.

*3: When the same malfunction is de-

tected in two consecutive trips, the
DTC and the freeze frame data will be
stored in ECM.

*4: The DTC and the freeze frame data

will not be displayed any longer after
vehicle is driven 40 times (pattern A)
without the same malfunction.
(The DTC and the freeze frame data
still remain in ECM.)

*5: When a malfunction is detected for

the first time, the 1st trip DTC and the
1st trip freeze frame data will be
stored in ECM.

*6: 1st trip DTC will be cleared after vehi-

cle is driven once (pattern B) without
the same malfunction.

*7: When the same malfunction is de-

tected in the 2nd trip, the 1st trip
freeze frame data will be cleared.

2011 Pathfinder

EC-72

< SYSTEM DESCRIPTION >

[VQ40DE]

DIAGNOSIS SYSTEM (ECM)

Calculated load value: (Calculated load value in the freeze frame data) x (1

0.1) [%]

Engine coolant temperature condition:

• When the freeze frame data shows lower than 70

C (158

F), engine coolant temperature should be lower

than 70

C (158

F).

• When the freeze frame data shows higher than or equal to 70

C (158

F), engine coolant temperature should

be higher than or equal to 70

C (158

F).

NOTE:

• When the same malfunction is detected regardless of the above vehicle conditions, reset the counter of driv-

ing pattern C.

• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving

pattern C.

• The 1st trip DTC will be cleared when C counter is counted once without the same malfunction after DTC is

stored in ECM.

DRIVING PATTERN D

Driving pattern D means a trip satisfying the following conditions.

• The state of driving at 40 km/h (25 MPH) reaches 300 seconds or more in total.

• Idle speed lasts 30 seconds or more.

• A lapse of 600 seconds or more after engine start.

NOTE:

• When the same malfunction is detected regardless of driving conditions, reset the counter of driving pattern

• When the above conditions are satisfied without detecting the same malfunction, reset the counter of driving

pattern D.

DIAGNOSIS DESCRIPTION : System Readiness Test (SRT) Code

INFOID:0000000006709462

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 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 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.

2011 Pathfinder

DIAGNOSIS SYSTEM (ECM)

EC-73

< SYSTEM DESCRIPTION >

[VQ40DE]

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 the number one (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”.

DIAGNOSIS DESCRIPTION : Malfunction Indicator Lamp (MIL)

INFOID:0000000006709463

When emission-related ECU detects a malfunction in the emission

control systems components and/or the powertrain control compo-

nents (which affect vehicle emissions), it turns on/blinks MIL to

inform the driver that a malfunction has been detected.

1. The MIL illuminates when ignition switch is turned ON (engine is

not running).

NOTE:

Check the MIL circuit if MIL does not illuminate. Refer to

GI-33,

"Work Flow"

2. When the engine is started, the MIL should go off.

NOTE:

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”

SEF217U

2011 Pathfinder

EC-74

< SYSTEM DESCRIPTION >

[VQ40DE]

DIAGNOSIS SYSTEM (ECM)

If MIL continues to illuminate/blink, perform self-diagnoses and inspect/repair accordingly because an

emission-related ECU has detected a malfunction in the emission control systems components and/or the

powertrain control components (which affect vehicle emissions).

On Board Diagnosis Function

INFOID:0000000006709464

ON BOARD DIAGNOSIS ITEM

The on board diagnostic system has the following functions.

BULB CHECK MODE

Description

This function allows damage inspection in the MIL bulb (blown, open circuit, etc.).

Operation Procedure

1. Turn ignition switch ON.
2. The MIL on the instrument panel should stay ON.

If it remains OFF, check MIL circuit. Refer to

GI-33, "Work Flow"

SRT STATUS MODE

Description

This function allows to read if ECM has completed the self-diagnoses of major emission control systems and

components. For SRT, refer to

EC-72, "DIAGNOSIS DESCRIPTION : System Readiness Test (SRT) Code"

Operation Procedure

1. Turn ignition switch ON and wait 20 seconds.
2. SRT status is indicated as shown blow.

• ECM continues to illuminate MIL if all SRT codes are set.

• ECM blinks MIL for about 10 seconds if all SRT codes are not set.

Diagnostic test mode

Function

Bulb check

MIL can be checked.

SRT status

ECM can read if SRT codes are set.

Malfunction warning

If ECM detects a malfunction, it illuminates or blinks MIL to inform the driver that a malfunction has
been detected.

Self-diagnostic results

DTCs or 1st trip DTCs stored in ECM can be read.

Accelerator pedal released po-
sition learning

ECM can learn the accelerator pedal released position. Refer to

EC-25, "Accelerator Pedal Released

Position Learning"

Throttle valve closed position
learning

ECM can learn the throttle valve closed position. Refer to

EC-25, "Throttle Valve Closed Position

Learning"

Idle air volume learning

ECM can learn the idle air volume. Refer to

EC-25, "Idle Air Volume Learning"

JMBIA1515GB

2011 Pathfinder

DIAGNOSIS SYSTEM (ECM)

EC-75

< SYSTEM DESCRIPTION >

[VQ40DE]

MALFUNCTION WARNING MODE

Description

In this function ECM turns on or blinks MIL when it detects a malfunction in the emission control system com-

ponents and/or the powertrain control components (which affect vehicle emissions) to inform the driver that a

malfunction has been detected.

Operation Procedure

1. Turn ignition switch ON.
2. Check that MIL illuminates.

If it remains OFF, check MIL circuit. Refer to

GI-33, "Work Flow"

3. Start engine and let it idle.

• For two trip detection logic diagnoses, ECM turns on MIL when it detects the same malfunction twice in

the two consecutive driving cycles.

• For 1st trip detection logic diagnoses, ECM turns on MIL when it detects a malfunction in one driving

cycle.

• ECM blinks MIL when it detects a malfunction that may damage the three way catalyst (misfire).

SELF-DIAGNOSTIC RESULTS MODE

Description

This function allows to indicate DTCs or 1st trip DTCs stored in ECM according to the number of times MIL is

blinking.

How to Set Self-diagnostic Results 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 mal-

function.

• After ignition switch is turned off, ECM is always released from the “self-diagnostic results” mode.
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.

• Fully depress the accelerator pedal.

• Fully release the accelerator pedal.

3. Wait 7 seconds, fully depress the accelerator pedal and keep it depressed for approx. 10 seconds until the

MIL starts blinking.

NOTE:

Do not release the accelerator pedal for 10 seconds if MIL starts blinking during this period. This blinking

is displaying SRT status and is continued for another 10 seconds.

4. Fully release the accelerator pedal.

ECM has entered to “Self-diagnostic results” mode.

NOTE:

Wait until the same DTC (or 1st trip DTC) appears to completely confirm all DTCs.

How to Read Self-diagnostic Results

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 “malfunction warning” mode, it is a DTC; if two or more codes are displayed, they may be either

PBIB0092E

2011 Pathfinder

EC-76

< SYSTEM DESCRIPTION >

[VQ40DE]

DIAGNOSIS SYSTEM (ECM)

DTCs or 1st trip DTCs. DTC No. is same as that of 1st trip DTC. These unidentified codes can be identified by

using the CONSULT-III or GST. A DTC will be used as an example for how to read a code.

A particular trouble code can be identified by the number of four-digit numeral flashes per the following.

The length of time the 1,000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-sec-

onds) - OFF (0.6-seconds) cycle.

The 100th-digit numeral and lower digit numerals consist of a 0.3-seconds ON and 0.3-seconds OFF cycle.

A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later

numeral appears on the display 1.3 seconds after the former numeral has disappeared.

A change from one trouble code to another occurs at an interval of 1.8-seconds OFF.

In this way, all the detected malfunctions are classified by their DTC numbers. The DTC 0000 refers to no mal-

function. Refer to

EC-441, "DTC Index"

How to Erase Self-diagnostic Results

By performing this procedure, ECM memory is erased and the following diagnostic information is erased as

well.

• Diagnostic trouble codes

• 1st trip diagnostic trouble codes

• Freeze frame data

• 1st trip freeze frame data

• System readiness test (SRT) codes

• Test values

NOTE:

Also, if a battery terminal is disconnected, ECM memory is erased and the diagnostic information as listed

above is erased. (The amount of time required for erasing may vary from a few seconds to several hours.)
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

PBIB3005E

Number

Flashes

2011 Pathfinder

DIAGNOSIS SYSTEM (ECM)

EC-77

< SYSTEM DESCRIPTION >

[VQ40DE]

4. Turn ignition switch ON.
5. Set ECM in “self-diagnostic results” mode.
6. The diagnostic information has been erased from the backup memory in the ECM.

Fully depress the accelerator pedal and keep it depressed for more than 10 seconds.

7. Fully release the accelerator pedal, and confirm the DTC 0000 is displayed.

CONSULT-III Function

INFOID:0000000006709465

FUNCTION

*: The following emission-related diagnostic information is 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

WORK SUPPORT MODE

Work Item

Diagnostic test mode

Function

Work support

This mode enables a technician to adjust some devices faster and more accurately by following the in-
dications on the CONSULT-III unit.

Self-diagnostic results

Self-diagnostic results such as 1st trip DTC, DTCs and 1st trip freeze frame data or freeze frame data
can be read and erased quickly.*

Data monitor

Input/Output data in the ECM can be read.

Active test

Diagnostic Test Mode in which CONSULT-III drives some actuators apart from the ECMs and also shifts
some parameters in a specified range.

Function test

This mode is used to inform customers when the vehicle requires periodic maintenance.

DTC & SRT confirmation

The status of system monitoring tests and the self-diagnosis status/results can be confirmed.

ECU identification

ECM part number can be read.

WORK ITEM

CONDITION

USAGE

FUEL PRESSURE RELEASE

• Fuel pump will stop by touching “START” during idling.

Crank a few times after engine stalls.

When releasing fuel pressure from
fuel line

IDLE AIR VOL LEARN

• The idle air volume that keeps the engine within the spec-

ified range is memorized In ECM.

When learning the idle air volume

SELF-LEARNING CONT

• The coefficient of self-learning control mixture ratio returns

to the original coefficient.

When clearing the coefficient of
self-learning control value

EVAP SYSTEM CLOSE

Close the EVAP canister vent control valve in order to make
EVAP system close under the following conditions.
• IGN SW ON
• Engine not running
• Ambient temperature is above 0

C (32

F).

• No vacuum and no high pressure in EVAP system
• Fuel tank temp is more than 0

C (32

F).

• Within 10 minutes after starting “EVAP SYSTEM CLOSE”
• When trying to execute “EVAP SYSTEM CLOSE” under

the condition except above, CONSULT-III will discontinue
it and display appropriate instruction.

NOTE:
When starting engine, CONSULT-III may display “BAT-
TERY VOLTAGE IS LOW. CHARGE BATTERY”, even
when using a charged battery.

When detecting EVAP vapor leak
in the EVAP system

VIN REGISTRATION

• In the mode, VIN is registered in ECM.

When registering VIN in ECM

2011 Pathfinder

Content .. 250 251 252 253 ..