Nissan Qashqai J11. Manual - part 290

 

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Nissan Qashqai J11. Manual - part 290

 

 

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

ECM-137

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

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DTC/CIRCUIT DIAGNOSIS

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Description

INFOID:0000000010702871

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

INFOID:0000000010702872

1.

START

Make sure that all of the following conditions are satisfied.
• Vehicle driven distance: More than 5,000 km (3,107 miles)
• Atmospheric 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
- After the engine is warmed up to normal operating temperature, drive vehicle until “ATF TEMP SEN” (CVT

fluid temperature sensor signal) indicates more than 60

°

C (140

°

F).

• Electrical load: Not applied*
• Engine speed: Idle
*: Rear window defogger switch, air conditioner switch, lighting switch are OFF. Steering wheel is straight
ahead.

>> 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 

ECM-132, "Work Procedure"

.

2.

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

3.

Make sure that monitor items are within the SP value.

Is the inspection result normal?

YES

>> END

NO

>> Proceed to 

ECM-138, "Diagnosis Procedure"

.

ECM-138

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TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Diagnosis Procedure

INFOID:0000000010702873

OVERALL SEQUENCE

PBIB2318E

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

ECM-139

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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 

ECM-137, "Component Function Check"

.

3.

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

PBIB3213E

ECM-140

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

NOTE:
Check “A/F ALPHA-B1” for approximately 1 minute because they 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 17.

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 19.

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 25.

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.

CHECK FUEL PRESSURE

Check fuel pressure. (Refer to 

ECM-135, "Work Procedure"

.)

Is the inspection result normal?

YES

>> GO TO 9.

NO-1

>> Fuel pressure is too high: Replace “fuel filter and fuel pump assembly”, refer to 

FL-19, "Removal

and Installation"

, and then GO TO 8.

NO-2

>> Fuel pressure is too low: GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check fuel hoses and fuel tubes for clogging

Is the inspection result normal?

YES

>> Replace “fuel filter and fuel pump assembly”, refer to 

FL-19, "Removal and Installation"

, and then

GO TO 8.

NO

>> Repair or replace and then GO TO 8.

 

 

 

 

 

 

 

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