Nissan Juke F15. Manual - part 493

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-785

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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

in “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 light 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 (The mean value of air-fuel ratio feedback correction factor per cycle)

• MASS AIR FLOW SENSOR (Hz) (The signal frequency of the mass air flow sensor)

Component Function Check

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1.

START

Make sure that all of the following conditions are satisfied.

• 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

- CVT models: After the engine is warmed up to normal operating temperature, drive vehicle until “FLUID

TEMP SE” (CVT fluid temperature sensor signal) indicates more than 60

°C (140°F).

- M/T models: After the engine is warmed up to normal operating temperature, drive vehicle for 5 minutes.

• Electrical load: Not applied

- Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight

ahead.

• Engine speed: Idle

>> GO TO 2.

2.

PERFORM “SPEC” OF “DATA MONITOR” MODE

With CONSULT

NOTE:

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

1. Perform 

EC-765, "Work Procedure"

.

2. Select “B/FUEL SCHDL”, “A/F ALPHA-B1” and “MASS AIR FLOW SENSOR (Hz)” in “SPEC” of “DATA

MONITOR” mode of “ENGINE” using CONSULT.

3. Make sure that monitor items are within the SP value.
Is the inspection result normal?

YES

>> END

NO

>> Proceed to 

EC-786, "Diagnosis Procedure"

.

EC-786

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[MR EXCEPT FOR NISMO RS MODELS]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Diagnosis Procedure

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OVERALL SEQUENCE

JSBIA1063GB

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-787

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DETAILED PROCEDURE

1.

CHECK “A/F ALPHA-B1”

With CONSULT

1. Start engine.

2. Confirm that the testing conditions are met. Refer to 

EC-785, "Component Function Check"

.

3. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within

the SP value.

PBIB3213E

EC-788

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[MR EXCEPT FOR NISMO RS MODELS]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

NOTE:

Check “A/F ALPHA-B1” for approximately 1 minute because it may fluctuate. It is NG if the indication is

out of the SP value even a little.

Is the measurement value within the SP value?

YES

>> GO TO 14.

NO-1 >> Less than the SP value: GO TO 2.

NO-2 >> More than the SP value: GO TO 3.

2.

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within the

SP value.
Is the measurement value within the SP value?

YES

>> GO TO 4.

NO

>> More than the SP value: GO TO 16.

3.

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within the

SP value.
Is the measurement value within the SP value?

YES

>> GO TO 6.

NO-1 >> More than the SP value: GO TO 6.

NO-2 >> Less than the SP value: GO TO 22.

4.

CHECK “A/F ALPHA-B1”

1. Stop the engine.

2. Disconnect PCV hose, and then plug it.

3. Start engine.

4. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITOR” mode, and make sure that the indication is within

the SP value.

Is the measurement value within the SP value?

YES

>> GO TO 5.

NO

>> GO TO 6.

5.

CHANGE ENGINE OIL

1. Stop the engine.

2. Change engine oil.

NOTE:

This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving

conditions (such as when engine oil temperature does not rise enough since a journey distance is too

short during winter). The symptom will not be detected after changing engine oil or changing driving con-

dition.

>> INSPECTION END

6.

PERFORM POWER BALANCE TEST

1. Perform “POWER BALANCE” in “ACTIVE TEST” mode.

2. Make sure that the each cylinder produces a momentary engine speed drop.
Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.

1. Ignition coil and its circuit (Refer to 

EC-1229, "Component Function Check"

.)

2. Fuel injector and its circuit (Refer to 

EC-1204, "Component Function Check"

.)

3. Intake air leakage

4. Low compression pressure (Refer to 

EM-182, "Inspection"

.)

Is the inspection result normal?