Nissan Xterra. Manual - part 253

EC-138

< BASIC INSPECTION >

[VQ40DE]

HOW TO ERASE PERMANENT DTC

Work Procedure (Group B)

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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.

1.

CHECK DTC

Check DTC.
Is any DTC detected?

YES

>> Repair malfunction(s) and erase DTC. Refer to 

EC-50, "On Board Diagnosis Function"

.

NO

>> GO TO 2.

2.

CHECK PERMANENT DTC

With CONSULT

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. Select “PERMANENT DTC STATUS” mode with CONSULT.

With GST

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.

*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.

JSBIA0414GB

HOW TO ERASE PERMANENT DTC

EC-139

< BASIC INSPECTION >

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5. Select Service $0A with GST.
Is any permanent DTC detected?

YES

>> GO TO 3.

NO

>> END

3.

DRIVE DRIVING PATTERN B

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 and D is reset.

With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Use “PERMANENT DTC WORK SUPPORT” mode with CONSULT to drive the vehicle according to driv-

ing pattern B. Refer to 

EC-53, "CONSULT Function"

, 

EC-47, "DIAGNOSIS DESCRIPTION : Driving Pat-

tern"

.

With GST

1. Start engine and warm it up to normal operating temperature.

2. Drive the vehicle according to driving pattern B. Refer to 

EC-47, "DIAGNOSIS DESCRIPTION : Driving

Pattern"

.

>> GO TO 4.

4.

CHECK PERMANENT DTC

With CONSULT

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. Select “PERMANENT DTC STATUS” mode with CONSULT.

With GST

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. Select Service $0A with GST.
Is any permanent DTC detected?

YES

>> GO TO 5.

NO

>> END

5.

DRIVE 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 and D is reset.

1. Drive the vehicle according to driving pattern D. Refer to 

EC-47, "DIAGNOSIS DESCRIPTION : Driving

Pattern"

.

>> GO TO 6.

6.

CHECK PERMANENT DTC

With CONSULT

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. Select “PERMANENT DTC STATUS” mode with CONSULT.

EC-140

< BASIC INSPECTION >

[VQ40DE]

HOW TO ERASE PERMANENT DTC

With GST

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. Select Service $0A with GST.
Is any permanent DTC detected?

YES

>> GO TO 1.

NO

>> END

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-141

< DTC/CIRCUIT DIAGNOSIS >

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DTC/CIRCUIT DIAGNOSIS

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Description

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The specification (SP) value indicates the tolerance of the value that is displayed in “SPEC” of “DATA MONI-

TOR” mode of CONSULT during normal operation of the Engine Control System. When the value in “SPEC” of

“DATA MONITOR” mode is within the SP value, the Engine Control System is confirmed OK. When the value

“SPEC” of “DATA MONITOR” mode is NOT within the SP value, the Engine Control System may have one or

more malfunctions.

The SP value is used to detect malfunctions that may affect the Engine Control System, but will not illuminate

the MIL.

The SP value will be displayed for the following three items:

• B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board correc-

tion)

• A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)

• MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)

Testing Condition

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• Vehicle driven distance: More than 5,000 km (3,107 miles)
• Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm

2

, 14.25 - 15.12 psi)

• Atmospheric temperature: 20 - 30

°C (68 - 86°F)

• Engine coolant temperature: 75 - 95

°C (167 - 203°F)

• Transmission: Warmed-up*

1

• Electrical load: Not applied*

2

• Engine speed: Idle

*1: After the engine is warmed up to normal operating temperature, drive vehicle until “FLUID TEMP SE” (A/T

fluid temperature sensor signal) indicates more than 60

°C (140°F).

*2: Rear window defogger switch, air conditioner switch lighting switch are OFF. Steering wheel is straight

ahead.

Inspection Procedure

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NOTE:

Perform “SPEC” of “DATA MONITOR” mode in maximum scale display.
1. Perform 

EC-118, "Basic Inspection"

.

2. Confirm that the testing conditions indicated above are met.
3. Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2” and “MAS A/F SE-B1” in “SPEC” of “DATA

MONITOR” mode with CONSULT.

4. Check that monitor items are within the SP value.
5. If NG, go to 

EC-141, "Diagnosis Procedure"

.

Diagnosis Procedure

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OVERALL SEQUENCE