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Nissan Pathfinder (2008 year). Manual - part 243

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-61

< FUNCTION DIAGNOSIS >

[VQ40DE]

Item

OBD-

MID

Self-diagnostic test item

DTC

Test value and Test

limit

(GST display)

Description

TID

Unit and

Scaling

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

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

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

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

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-63

< FUNCTION DIAGNOSIS >

[VQ40DE]

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

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

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-65

< FUNCTION DIAGNOSIS >

[VQ40DE]

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

EC-453, "DTC Index"

), 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

EC-66

< FUNCTION DIAGNOSIS >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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-33

. (The DTC in TCM will be erased.)

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

No Tools

NOTE:
If the DTC is not for A/T related items (see

EC-453, "DTC Index"

), skip step 2.

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-33

. (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-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.

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

MWI-3, "Work Flow"

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

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-67

< FUNCTION DIAGNOSIS >

[VQ40DE]

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

EC-453, "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.

• Always ECM returns to Diagnostic Test Mode I after 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 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

EC-453, "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

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

EC-68

< FUNCTION DIAGNOSIS >

[VQ40DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

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)

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 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

MWI-

3, "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.

Content .. 241 242 243 244 ..