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Nissan Frontier D40. Manual - part 342

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-59

< FUNCTION DIAGNOSIS >

[QR25DE]

MISFIRE

A1H

Multiple Cylinder Misfires

P0301

80H

24H

Misfiring counter at 1000 revolution of
the first cylinder

P0302

81H

24H

Misfiring counter at 1000 revolution of
the second cylinder

P0303

82H

24H

Misfiring counter at 1000 revolution of
the third cylinder

P0304

83H

24H

Misfiring counter at 1000 revolution of
the fourth cylinder

P0305

84H

24H

Misfiring counter at 1000 revolution of
the fifth cylinder

P0306

85H

24H

Misfiring counter at 1000 revolution of
the sixth cylinder

P0307

86H

24H

Misfiring counter at 1000 revolution of
the seventh cylinder

P0308

87H

24H

Misfiring counter at 1000 revolution of
the eighth cylinder

P0300

88H

24H

Misfiring counter at 1000 revolution 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
eighth cylinder

P0300

91H

24H

Misfiring counter at 1000 revolution 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

EC-60

< FUNCTION DIAGNOSIS >

[QR25DE]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION

How to Erase DTC

With CONSULT-III

NOTE:
• 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.

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

EC-424

), skip step 1.

Erase DTC in TCM. Refer to

TM-149, "OBD-II Diagnostic Trouble Code (DTC)"

Select “ENGINE” with CONSULT-III.

Select “SELF-DIAG RESULTS”.

MISFIRE

A2H

No. 1 Cylinder Misfire

P0301

0BH

24H

EWMA (Exponential Weighted Moving
Average) misfire counts for last 10 driv-
ing cycles

P0301

0CH

24H

Misfire counts for last/current driving cy-
cles

A3H

No. 2 Cylinder Misfire

P0302

0BH

24H

EWMA (Exponential Weighted Moving
Average) misfire counts for last 10 driv-
ing cycles

P0302

0CH

24H

Misfire counts for last/current driving cy-
cles

A4H

No. 3 Cylinder Misfire

P0303

0BH

24H

EWMA (Exponential Weighted Moving
Average) misfire counts for last 10 driv-
ing cycles

P0303

0CH

24H

Misfire counts for last/current driving cy-
cles

A5H

No. 4 Cylinder Misfire

P0304

0BH

24H

EWMA (Exponential Weighted Moving
Average) misfire counts for last 10 driv-
ing cycles

P0304

0CH

24H

Misfire counts for last/current driving cy-
cles

A6H

No. 5 Cylinder Misfire

P0305

0BH

24H

EWMA (Exponential Weighted Moving
Average) misfire counts for last 10 driv-
ing cycles

P0305

0CH

24H

Misfire counts for last/current driving cy-
cles

A7H

No. 6 Cylinder Misfire

P0306

0BH

24H

EWMA (Exponential Weighted Moving
Average) misfire counts for last 10 driv-
ing cycles

P0306

0CH

24H

Misfire counts for last/current driving cy-
cles

A8H

No. 7 Cylinder Misfire

P0307

0BH

24H

EWMA (Exponential Weighted Moving
Average) misfire counts for last 10 driv-
ing cycles

P0307

0CH

24H

Misfire counts for last/current driving cy-
cles

A9H

No. 8 Cylinder Misfire

P0308

0BH

24H

EWMA (Exponential Weighted Moving
Average) misfire counts for last 10 driv-
ing cycles

P0308

0CH

24H

Misfire counts for last/current driving cy-
cles

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-61

< FUNCTION DIAGNOSIS >

[QR25DE]

Touch “ERASE”. (DTC in ECM will be erased.)

With GST

NOTE:
• 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.

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

No Tools

NOTE:
• 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.

Erase DTC in ECM. Refer to How To ERASE DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC
RESULTS).

NOTE:
• If the battery is disconnected, the emission-related diagnostic information will be cleared 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:0000000005273040

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 light up, refer to

MWI-41

When the engine is started, the MIL should turn off.
If the MIL remains illuminated, the on board diagnostic system
has detected an engine system malfunction.

ON BOARD DIAGNOSTIC SYSTEM FUNCTION

The on board diagnostic system has the following 3 functions.

SEF217U

EC-62

< FUNCTION DIAGNOSIS >

[QR25DE]

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 Flashing Without DTC

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

EC-424, "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 5 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-424, "DTC Index"

Fully release the accelerator pedal.

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 illuminate, 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 light up
to inform the driver that a malfunction has been detected.
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

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