Nissan Frontier D40. Manual - part 457

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-519

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NOTE:
• Drive the vehicle according to only driving patterns indicating “INCMP” in driving patterns B and D on the

“PERMANENT DTC STATUS” screen.

• When experiencing both driving pattern B and D during the same trip, the experience of driving pattern D is

counted by priority.

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.

4.

Turn ignition switch ON.

5.

Check permanent DTC. Refer to 

EC-501, "Emission-related Diagnostic Information"

, “How to Display Per-

manent DTC Status”.

6.

Start engine and warm it up to normal operating temperature.

7.

Drive the vehicle according to driving pattern D.

CAUTION:

• Always drive at a safe speed.
• Never erase self-diagnosis results.
• If self-diagnosis results are erased during the trip of driving pattern B or D, the counter of driving

pattern B or D is reset.

• If self-diagnosis results are erased during the trip of driving pattern B or D, an experience of driv-

ing pattern B and D during the same trip is not counted up.

8.

Turn ignition switch OFF and wait at least 10 seconds.

9.

Turn ignition switch ON.

10. Turn ignition switch OFF and wait at least 10 seconds.
11. Turn ignition switch ON.
12. Use “PERMANENT DTC WORK SUPPORT” to drive the vehicle according to driving pattern B.

*1:

When the same malfunction is de-
tected in two consecutive trips, MIL 
will illuminate.

*2:

After experiencing Driving pattern B 
and D, permanent DTC is erased.

*3:

Indication does not change unless 
the ignition switch is turned from ON 
to OFF twice even after experiencing 
Driving pattern B or D.

JSBIA0068GB

EC-520

< FUNCTION DIAGNOSIS >

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ON BOARD DIAGNOSTIC (OBD) SYSTEM

CAUTION:

• Always drive at a safe speed.
• Never erase self-diagnosis results.
• If self-diagnosis results are erased during the trip of driving pattern B or D, the counter of driving

pattern B or D is reset.

• If self-diagnosis results are erased during the trip of driving pattern B or D, an experience of driv-

ing pattern B and D during the same trip is not counted up.

13. Turn ignition switch OFF and wait at least 10 seconds.
14. Turn ignition switch ON.
15. Turn ignition switch OFF and wait at least 10 seconds.
16. Turn ignition switch ON.
17. Check permanent DTC. Refer to 

EC-501, "Emission-related Diagnostic Information"

, “How to Display Per-

manent DTC Status”.

18. Check that the permanent DTCs have been erased.

Malfunction Indicator Lamp (MIL)

INFOID:0000000005273488

DESCRIPTION

The MIL is located on the instrument panel.

1.

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 

MWI-17, "WARNING

LAMPS/INDICATOR LAMPS : System Diagram"

.

2.

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

ON BOARD DIAGNOSTIC (OBD) SYSTEM

EC-521

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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 Brinking Without DTC

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

EC-919, "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)

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.

a.

Fully depress the accelerator pedal.

b.

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. For the details, refer to

EC-919, "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

EC-522

< FUNCTION DIAGNOSIS >

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ON BOARD DIAGNOSTIC (OBD) SYSTEM

4.

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)

1.

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

2.

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.

3.

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-

17, "WARNING LAMPS/INDICATOR LAMPS : System Diagram"

.

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

ON

When the malfunction is detected.

OFF

No malfunction.