Content .. 254 255 256 257 ..

Nissan Pathfinder (2009 year). Manual - part 256

EC-62

< FUNCTION DIAGNOSIS >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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

2009 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-63

< FUNCTION DIAGNOSIS >

[VQ40DE]

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 1000 revolu-
tion of the first cylinder

P0302

81H

24H

Misfiring counter at 1000 revolu-
tion of the second cylinder

P0303

82H

24H

Misfiring counter at 1000 revolu-
tion of the third cylinder

P0304

83H

24H

Misfiring counter at 1000 revolu-
tion of the fourth cylinder

P0305

84H

24H

Misfiring counter at 1000 revolu-
tion of the fifth cylinder

P0306

85H

24H

Misfiring counter at 1000 revolu-
tion of the sixth cylinder

P0307

86H

24H

Misfiring counter at 1000 revolu-
tion of the seventh cylinder

P0308

87H

24H

Misfiring counter at 1000 revolu-
tion of the eighth cylinder

P0300

88H

24H

Misfiring counter at 1000 revolu-
tion of the multiple cylinders

P0301

89H

24H

Misfiring counter at 200 revolution
of the first cylinder

P0302

8AH

24H

Misfiring counter at 200 revolution
of the second cylinder

P0303

8BH

24H

Misfiring counter at 200 revolution
of the third cylinder

P0304

8CH

24H

Misfiring counter at 200 revolution
of the fourth cylinder

P0305

8DH

24H

Misfiring counter at 200 revolution
of the fifth cylinder

P0306

8EH

24H

Misfiring counter at 200 revolution
of the sixth cylinder

P0307

8FH

24H

Misfiring counter at 200 revolution
of the seventh cylinder

P0308

90H

24H

Misfiring counter at 200 revolution
of the eightth cylinder

P0300

91H

24H

Misfiring counter at 1000 revolu-
tion of the single cylinder

P0300

92H

24H

Misfiring counter at 200 revolution
of the single cylinder

P0300

93H

24H

Misfiring counter at 200 revolution
of the multiple cylinders

Item

OBD-

MID

Self-diagnostic test item

DTC

Test value and Test

limit

(GST display)

Description

TID

Unit and

Scaling

2009 Pathfinder

EC-64

< FUNCTION DIAGNOSIS >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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.
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.

Perform

TM-34, "OBD-II Diagnostic Trouble Code (DTC)"

. (The DTC in TCM will be erased.)

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

2009 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-65

< FUNCTION DIAGNOSIS >

[VQ40DE]

Select Service $04 with GST (Generic Scan Tool).

No Tools

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.

Perform

TM-34, "OBD-II Diagnostic Trouble Code (DTC)"

. (The DTC in TCM will be erased.)

Change the diagnostic test mode from Mode II to Mode I by depressing the accelerator pedal. Refer to

EC-65, "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:0000000004297259

DESCRIPTION

The MIL is located on the instrument panel.

The MIL will illuminate when the ignition switch is turned ON
without the engine running. This is a bulb check.
If the MIL does not illuminate, refer to

GI-45, "Work Flow"

When the engine is started, the MIL should turn 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

2009 Pathfinder

EC-66

< FUNCTION DIAGNOSIS >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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.

MIL blinking Without DTC

When any SRT codes are not set, MIL may blink without DTC. For the details, refer to

EC-456, "DTC Index"

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.

• ECM always returns to Diagnostic Test Mode I after the ignition switch is turned OFF.

How to Set Diagnostic Test Mode II (Self-diagnostic Results)

Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.

Repeat the following procedure quickly five times within 5 seconds.

Fully depress the accelerator pedal.

Fully release the accelerator pedal.

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. For the details, refer to

EC-456, "DTC Index"

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

When a malfunction is detected twice in two consecutive
driving cycles (two trip detection logic), the MIL will illumi-
nate to inform the driver that a malfunction has been detect-
ed.
The following malfunctions will illuminate 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

2009 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-67

< FUNCTION DIAGNOSIS >

[VQ40DE]

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 completely confirm all DTCs.

How to Erase Diagnostic Test Mode II (Self-diagnostic Results)

Set ECM in Diagnostic Test Mode II (Self-diagnostic results). Refer to "How to Set Diagnostic Test Mode II
(Self-diagnostic Results)".

Fully depress the accelerator pedal and keep it depressed for more than 10 seconds.
The emission-related diagnostic information has been erased from the backup memory in the ECM.

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

GI-

45, "Work Flow"

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

When the malfunction is detected.

OFF

No malfunction.

2009 Pathfinder

EC-68

< FUNCTION DIAGNOSIS >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

tified 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 blinks. The “zero” is indicated by
the number of ten blinks. The “A” is indicated by the number of eleven blink. The length of time the 1,000th-
digit numeral blinks on and off is 1.2 seconds consisting of an ON (0.6-seconds) - 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. (See

EC-456, "DTC Index"

)

How to Erase Diagnostic Test Mode II (Self-diagnostic Results)

The DTC can be erased from the back up memory in the ECM by depressing accelerator pedal. Refer to "How
to Set Diagnostic Test Mode II (Self-diagnostic Results)".
• If the battery is disconnected, the DTC will be lost from the backup memory within 24 hours.
• Be careful not to erase the saved memory before starting trouble diagnoses.

OBD System Operation Chart

INFOID:0000000004297260

RELATIONSHIP BETWEEN MIL, 1ST TRIP DTC, DTC, AND DETECTABLE ITEMS

• When a malfunction is detected for the first time, the 1st trip DTC and the 1st trip freeze frame data are

saved in the ECM memory.

• When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are

saved in the ECM memory, and the MIL will come on. For details, refer to

EC-52, "Two Trip Detection Logic"

• The MIL will turn off after the vehicle is driven 3 times with no malfunction. A drive is counted only when the

recorded driving pattern is met (as saved in the ECM). If another malfunction occurs while counting, the
counter will reset.

• The DTC and the freeze frame data will be saved until the vehicle is driven 40 times (driving pattern A) with-

out the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and Fuel Injec-
tion System, the DTC and freeze frame data will be saved until the vehicle is driven 80 times (driving pattern

PBIB3005E

2009 Pathfinder

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-69

< FUNCTION DIAGNOSIS >

[VQ40DE]

C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC RESULTS” mode of CON-
SULT-III will count the number of times the vehicle is driven.

• The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.

SUMMARY CHART

For details about patterns B and C under “Fuel Injection System” and “Misfire”, see "EXPLANATION FOR DRIVING PATTERNS FOR
“MISFIRE <EXHAUST QUALITY DETERIORATION>”, “FUEL INJECTION SYSTEM”".

For details about patterns A and B under Other, see "EXPLANATION FOR DRIVING PATTERNS FOR “MISFIRE <EXHAUST QUALITY
DETERIORATION>”, “FUEL INJECTION SYSTEM”".

*1: Clear timing is at the moment OK is detected.

*2: Clear timing is when the same malfunction is detected in the 2nd trip.

RELATIONSHIP BETWEEN MIL, DTC, 1ST TRIP DTC AND DRIVING PATTERNS FOR “MISFIRE ”
<EXHAUST QUALITY DETERIORATION>, “FUEL INJECTION SYSTEM”

Items

Fuel Injection System

Misfire

Other

MIL (turns off)

3 (pattern B)

DTC, Freeze Frame Data (no
display)

80 (pattern C)

40 (pattern A)

1st Trip DTC (clear)

1 (pattern C), *1

1 (pattern B)

1st Trip Freeze Frame Data
(clear)

*1, *2

1 (pattern B)

2009 Pathfinder

Content .. 254 255 256 257 ..