Qashqai J11. Engine control system (MR20DD)

ECM-130

< BASIC INSPECTION >

[MR20DD]

IDLE AIR VOLUME LEARNING

10. Wait 20 seconds.

>> GO TO 4.

CHECK IDLE SPEED AND IGNITION TIMING

Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifi-
cations. For specification, refer to

ECM-417, "Idle Speed"

and

ECM-417, "Ignition Timing"

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 5.

DETECT MALFUNCTIONING PART-1

Check the following
• Check that throttle valve is fully closed.
• Check PCV valve operation.
• Check that downstream of throttle valve is free from air leakage.
Is the inspection result normal?

YES

>> GO TO 6.

>> Repair or replace malfunctioning part.

DETECT MALFUNCTIONING PART-2

Engine component parts and their installation condition are questionable. Check and eliminate the cause of
the incident.
It is useful to perform “TROUBLE DIAGNOSIS – SPECIFICATION VALUE”. Refer to

ECM-137, "Description"

If any of the following conditions occur after the engine has started, eliminate the cause of the incident and
perform “IDLE AIR VOLUME LEARNING” all over again:
• Engine stalls
• Erroneous idle

>> INSPECTION END

SEC897C

MIXTURE RATIO SELF-LEARNING VALUE CLEAR

ECM-131

< BASIC INSPECTION >

[MR20DD]

ECM

MIXTURE RATIO SELF-LEARNING VALUE CLEAR

Description

INFOID:0000000010702867

This describes how to erase the mixture ratio self-learning value. For the actual procedure, follow the instruc-
tions in “Diagnosis Procedure”.

Work Procedure

INFOID:0000000010702868

START

With CONSULT

Start engine and warm it up to normal operating temperature.

Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT.

Clear mixture ratio self-learning value by touching “CLEAR”.

Without CONSULT

Start engine and warm it up to normal operating temperature.

Turn ignition switch OFF.

Disconnect mass air flow sensor harness connector.

Restart engine and let it idle for at least 5 seconds.

Stop engine and reconnect mass air flow sensor harness connector.

Check DTC. Make sure DTC P0102 is detected.

Erase the DTC P0102. Refer to

ECM-63, "On Board Diagnosis Function"

Check DTC. Make sure DTC P0000 is detected.

>> END

ECM-132

< BASIC INSPECTION >

[MR20DD]

BASIC INSPECTION

BASIC INSPECTION

Work Procedure

INFOID:0000000010702869

INSPECTION START

Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.

Open engine hood and check the following:

Harness connectors for improper connections

Wiring harness for improper connections, pinches and cut

Vacuum hoses for splits, kinks and improper connections

Hoses and ducts for leaks

Air cleaner clogging

Gasket

Confirm that electrical or mechanical loads are not applied.

Headlamp switch is OFF.

Air conditioner switch is OFF.

Rear window defogger switch is OFF.

Steering wheel is in the straight-ahead position, etc.

Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
Ensure engine stays below 1,000 rpm.

Run engine at about 2,000 rpm for about 2 minutes under no
load.

Make sure that no DTC is displayed with CONSULT or Diagnos-
tic Test Mode II (self-diagnostic results).

Is any DTC detected?

YES

>> GO TO 2.

>> GO TO 3.

REPAIR OR REPLACE

Repair or replace components as necessary according to corresponding Diagnostic Procedure.

>> GO TO 3.

CHECK TARGET IDLE SPEED

Run engine at about 2,000 rpm for about 2 minutes under no load.

Rev engine (2,000 to 3,000 rpm) two or three times under no
load, then run engine at idle speed for about 1 minute.

Check idle speed.
For procedure, refer to

ECM-412, "Inspection"

For specification, refer to

ECM-417, "Idle Speed"

Is the inspection result normal?

YES

>> GO TO 10.

>> GO TO 4.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

Stop the engine.

Perform accelerator pedal released position learning. Refer to

ECM-127, "Work Procedure"

>> GO TO 5.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

SEF983U

SEF977U

PBIA8513J

BASIC INSPECTION

ECM-133

< BASIC INSPECTION >

[MR20DD]

ECM

Perform throttle valve closed position learning. Refer to

ECM-128, "Work Procedure"

>> GO TO 6.

PERFORM IDLE AIR VOLUME LEARNING

Perform idle air volume learning. Refer to

ECM-129, "Work Procedure"

Is Idle Air Volume Learning carried out successfully?

YES

>> GO TO 7.

>> Follow the instruction of IDLE AIR VOLUME LEARNING. Then GO TO 4.

CHECK TARGET IDLE SPEED AGAIN

Start engine and warm it up to normal operating temperature.

Check idle speed.
For procedure, refer to

ECM-412, "Inspection"

For specification, refer to

ECM-417, "Idle Speed"

Is the inspection result normal?

YES

>> GO TO 10.

>> GO TO 8.

DETECT MALFUNCTIONING PART

Check the Following.
• Check camshaft position sensor and circuit. Refer to

ECM-263, "DTC Description"

• Check exhaust valve timing control position sensor and circuit. Refer to

ECM-267, "DTC Description"

• Check crankshaft position sensor and circuit. Refer to

ECM-259, "DTC Description"

Is the inspection result normal?

YES

>> GO TO 9.

>> Repair or replace. Then GO TO 4.

CHECK ECM FUNCTION

Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this
is a rare case.)

>> GO TO 4.

10.

CHECK IGNITION TIMING

Run engine at idle.

Check ignition timing with a timing light.

For procedure, refer to

ECM-413, "Inspection"

For specification, refer to

ECM-417, "Ignition Timing"

Is the inspection result normal?

YES

>> GO TO 19.

>> GO TO 11.

11.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

Stop the engine.

Perform accelerator pedal released position learning. Refer to

ECM-127, "Work Procedure"

>> GO TO 12.

12.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform throttle valve closed position learning. Refer to

ECM-128, "Work Procedure"

: Timing indicator

JMBIA0315ZZ

ECM-134

< BASIC INSPECTION >

[MR20DD]

BASIC INSPECTION

>> GO TO 13.

13.

PERFORM IDLE AIR VOLUME LEARNING

Perform idle air volume learning. Refer to

ECM-129, "Work Procedure"

Is Idle Air Volume Learning carried out successfully?

YES

>> GO TO 14.

>> Follow the instruction of IDLE AIR VOLUME LEARNING. Then GO TO 4.

14.

CHECK TARGET IDLE SPEED AGAIN

Start engine and warm it up to normal operating temperature.

Check idle speed.
For procedure, refer to

ECM-412, "Inspection"

For specification, refer to

ECM-417, "Idle Speed"

Is the inspection result normal?

YES

>> GO TO 15.

>> GO TO 17.

15.

CHECK IGNITION TIMING AGAIN

Run engine at idle.

Check ignition timing with a timing light.

For procedure, refer to

ECM-413, "Inspection"

For specification, refer to

ECM-417, "Ignition Timing"

Is the inspection result normal?

YES

>> GO TO 19.

>> GO TO 16.

16.

CHECK TIMING CHAIN INSTALLATION

Check timing chain installation. Refer to

EM-184, "Removal and Installation"

Is the inspection result normal?

YES

>> GO TO 17.

>> Repair the timing chain installation. Then GO TO 4.

17.

DETECT MALFUNCTIONING PART

Check the Following.
• Check camshaft position sensor and circuit. Refer to

ECM-263, "DTC Description"

• Check exhaust valve timing control position sensor and circuit. Refer to

ECM-267, "DTC Description"

• Check crankshaft position sensor and circuit. Refer to

ECM-259, "DTC Description"

Is the inspection result normal?

YES

>> GO TO 18.

>> Repair or replace. Then GO TO 4.

18.

CHECK ECM FUNCTION

Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this
is a rare case.)

>> GO TO 4.

19.

INSPECTION END

If ECM is replaced during this BASIC INSPECTION procedure, perform

ECM-124, "Work Procedure"

>> INSPECTION END

: Timing indicator

JMBIA0315ZZ

FUEL PRESSURE CHECK

ECM-135

< BASIC INSPECTION >

[MR20DD]

ECM

FUEL PRESSURE CHECK

Work Procedure

INFOID:0000000010702870

FUEL PRESSURE RELEASE

With CONSULT

Turn ignition switch ON.

Perform “ENGINE” in “WORK SUPPORT” mode with CONSULT.

Start the engine.

After engine stalls, crank it two or three times to release all fuel pressure.

Turn ignition switch OFF.

Without CONSULT

Remove fuel pump fuse

located in IPDM E/R.

Start the engine.

After engine stalls, crank it two or three times to release all fuel
pressure.

Turn ignition switch OFF.

Reinstall fuel pump fuse after servicing fuel system.

>> INSPECTION END

FUEL PRESSURE CHECK

Release fuel pressure.

Connect fuel hose for fuel pressure check (B) to fuel pressure
gauge (A) (SST: ST19590000). Then, connect fuel hose for fuel
pressure check to fuel tube adapter (D) (SST: KV10120000) with
hose clamp (C).

CAUTION:

• Use suitable fuel hose for fuel pressure check (genuine

NISSAN fuel hose)

• To avoid unnecessary force or tension to hose, use moderately long fuel hose for fuel pressure

check.

• Wipe off oil or dirt from hose insertion part using cloth moistened with gasoline.
• Apply proper amount of gasoline on the hose insertion part.
• Use NISSAN genuine hose clamp (part number: 16439 N4710 or 16439 N4710)
• Install hose clamp to the hose end position within 1- 2 mm (0.04 - 0.08 in) and tighten hose clamp

to the specified torque.

Disconnect quick connector and disconnect fuel feed hose from high pressure fuel pump. Refer to

EM-

164, "Exploded View"

CAUTION:

• Make sure to release fuel pressure before removal of fuel line.
• Do the following procedure in the place where ventilation is good without the combustible.
NOTE:
• Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pres-

sure cannot be completely released because this models do not have fuel return system.

JSBIA0597ZZ

: To high pressure fuel pump

: To quick connector

Tightening torque: 1 - 1.5 N·m (0.1 - 0.15 kg

−

PBIB2982E

ECM-136

< BASIC INSPECTION >

[MR20DD]

FUEL PRESSURE CHECK

• Use fuel tube adapter (SST: KV10120000) and fuel pressure gauge (SST: ST19590000) to check fuel

pressure.

Install fuel hose for fuel pressure check to high pressure fuel
pump with hose clamp.

CAUTION:

• Wipe off oil or dirt from hose insertion part using cloth

moistened with gasoline.

• Apply proper amount of gasoline on the hose insertion

part.

• Insert fuel hose for fuel pressure check

until it touches-

the spool

on high pressure fuel pump

• Use NISSAN genuine hose clamp

(part number:

16439 N4710 or 16439 40U00).

• Install hose clamp to the hose end position within 1- 2 mm

(0.04 - 0.08 in) and tighten hose clamp to the specified torque.

• After connecting fuel hose for fuel pressure check, pull the hose with a force of approximately

100 N (approximately 10 kg, 22 lb) to confirm fuel sub tube does not come off.

Install fuel pressure check adapter to quick connector of fuel
feed hose.

Turn ignition switch ON and check for fuel leakage.

Start engine and check for fuel leakage.

Read the indication of fuel pressure gauge (A).

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 2.

CHECK FUEL HOSE

Check fuel hose for clogging.
Is the inspection result normal?

YES

>> Repair or replace the malfunctioning part.

>> Replace fuel filter and fuel pump assembly. Refer to

FL-18, "Exploded View"

Tightening torque: 1 - 1.5 N·m (0.1 - 0.15 kg

−

At idling

: Approximately 500 kPa (5.0 bar,

5.1 kg/cm

, 73psi)

JPBIA4923GB

JSBIA1305ZZ

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

ECM-137

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

ECM

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

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

, 14.25 - 15.12 psi)

• Atmospheric temperature: 20 - 30

C (68 - 86

• Engine coolant temperature: 75 - 95

C (167 - 203

• 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.

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"

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

Make sure that monitor items are within the SP value.

Is the inspection result normal?

YES

>> END

>> Proceed to

ECM-138, "Diagnosis Procedure"

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

ECM-139

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

ECM

DETAILED PROCEDURE

CHECK “A/F ALPHA-B1”

With CONSULT

Start engine.

Confirm that the testing conditions are met. Refer to

ECM-137, "Component Function Check"

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.

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.

>> More than the SP value: GO TO 19.

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.

CHECK “A/F ALPHA-B1”

Stop the engine.

Disconnect PCV hose, and then plug it.

Start engine.

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.

>> GO TO 6.

CHANGE ENGINE OIL

Stop the engine.

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

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.

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.

>> Repair or replace and then GO TO 8.

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

ECM-141

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

ECM

CHECK “A/F ALPHA-B1”

Start engine.

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

>> INSPECTION END

>> GO TO 9.

PERFORM POWER BALANCE TEST

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

Make sure that the each cylinder produces a momentary engine speed drop.

Is the inspection result normal?

YES

>> GO TO 12.

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.
1.

Ignition coil and its circuit (Refer to

ECM-385, "Component Function Check"

Fuel injector and its circuit (Refer to

ECM-372, "Component Function Check"

Intake air leakage

Low compression pressure (Refer to

EM-136, "Inspection"

Is the inspection result normal?

YES

>> Replace fuel injector, refer to

EM-164, "Removal and Installation"

, and then GO TO 11.

>> Repair or replace malfunctioning part and then GO TO 11.

11.

CHECK “A/F ALPHA-B1”

Start engine.

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

>> INSPECTION END

>> GO TO 12.

12.

CHECK A/F SENSOR 1 FUNCTION

Perform all DTC CONFIRMATION PROCEDURE related with A/F sensor 1.
• For DTC P0130, refer to

ECM-197, "DTC Description"

• For DTC P0131, refer to

ECM-200, "DTC Description"

• For DTC P0132, refer to

ECM-203, "DTC Description"

• For DTC P014C, P014D, refer to

ECM-225, "DTC Description"

Is any DTC detected?

YES

>> GO TO 15.

>> GO TO 13.

13.

CHECK A/F SENSOR 1 CIRCUIT

Perform DIAGNOSTIC PROCEDURE according to corresponding DTC.

>> GO TO 14.

14.

CHECK “A/F ALPHA-B1”

Start engine.

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

Is the measurement value within the SP value?

YES

>> INSPECTION END

>> GO TO 15.

15.

DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR

ECM-142

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Stop the engine.

Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.

>> GO TO 16.

16.

CHECK “A/F ALPHA-B1”

Start engine.

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

>> INSPECTION END

>> Detect malfunctioning part according to

ECM-407, "Symptom Table"

17.

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

>> INSPECTION END

NO-1

>> More than the SP value: GO TO 18.

NO-2

>> Less than the SP value: GO TO 25.

18.

DETECT MALFUNCTIONING PART

Check for the cause of large engine friction. Refer to the following.

Engine oil level is too high

Engine oil viscosity

Belt tension of power steering, alternator, A/C compressor, etc. is excessive

Noise from engine

Noise from transmission, etc.

Check for the cause of insufficient combustion. Refer to the following.

Valve clearance malfunction

Intake valve timing control function malfunction

Camshaft sprocket installation malfunction, etc.

>> Repair or replace malfunctioning part, and then GO TO 30.

19.

CHECK INTAKE SYSTEM

Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
• Crushed air ducts
• Malfunctioning seal of air cleaner element
• Uneven dirt of air cleaner element
• Improper specification of intake air system

Is the inspection result normal?

YES

>> GO TO 21.

>> Repair or replace malfunctioning part, and then GO TO 20.

20.

CHECK “A/F ALPHA-B1”, AND “B/FUEL SCHDL”

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

Is the measurement value within the SP value?

YES

>> INSPECTION END

>> “B/FUEL SCHDL” is more, “A/F ALPHA-B1” is less than the SP value: GO TO 21.

21.

DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR

Stop the engine.

Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and
then reconnect it again.

>> GO TO 22.

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

ECM-143

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

ECM

22.

CHECK “A/F ALPHA-B1”

Start engine.

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

>> Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to

ECM-179, "DTC

Description"

. Then GO TO 29.

>> GO TO 23.

23.

CHECK “MASS AIR FLOW SENSOR (HZ)”

Select “MASS AIR FLOW SENSOR (Hz)” in “SPEC” of “DATA MONITOR” mode, and make sure that the indi-
cation is within the SP value.
Is the measurement value within the SP value?

YES

>> GO TO 24.

>> More than the SP value: Replace mass air flow sensor, refer to

EM-147, "Removal and Installa-

tion"

, and then GO TO 29.

24.

REPLACE ECM

Replace ECM. Refer to

ECM-416, "Removal and Installation"

>> GO TO 29.

25.

CHECK INTAKE SYSTEM

Is the inspection result normal?

YES

>> GO TO 27.

>> Repair or replace malfunctioning part, and then GO TO 26.

26.

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

>> INSPECTION END

>> Less than the SP value: GO TO 27.

27.

CHECK “MASS AIR FLOW SENSOR (HZ)”

Select “MASS AIR FLOW SENSOR (Hz)” in “SPEC” of “DATA MONITOR” mode, and make sure that the indi-
cation is within the SP value.

Is the measurement value within the SP value?

YES

>> GO TO 28.

>> Less than the SP value: Replace mass air flow sensor, refer to

EM-147, "Removal and Installa-

tion"

, and then GO TO 30.

28.

CHECK INTAKE SYSTEM

Check for the cause of air leak after the mass air flow sensor. Refer to the following.
• Disconnection, looseness, and cracks in air duct
• Looseness of oil filler cap
• Disconnection of oil level gauge
• Open stuck, breakage, hose disconnection, or cracks of PCV valve
• Disconnection or cracks of EVAP purge hose, open stuck of EVAP canister purge volume control solenoid

valve

• Malfunctioning seal of rocker cover gasket
• Disconnection, looseness, or cracks of hoses, such as vacuum hose, connecting to intake air system parts

ECM-144

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

• Malfunctioning seal of intake air system, etc.

>> GO TO 30.

29.

CHECK “A/F ALPHA-B1” AND “B/FUEL SCHDL”

Select “A/F ALPHA-B1” and “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

>> INSPECTION END

>> Detect malfunctioning part according to

ECM-407, "Symptom Table"

30.

CHECK “B/FUEL SCHDL”

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

Is the measurement value within the SP value?

YES

>> INSPECTION END

>> Detect malfunctioning part according to

ECM-407, "Symptom Table"

POWER SUPPLY AND GROUND CIRCUIT

ECM-145

< DTC/CIRCUIT DIAGNOSIS >

[MR20DD]

ECM

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000010702874

CHECK FUSE

Turn ignition switch OFF.

Check that the following fuse is not fusing.

Is the fuse fusing?

YES

>> Replace the fuse. (Check the power supply if it fuses again.)

>> Go to 2.

CHECK GROUND CONNECTION

Check ground connection E4 and E5. Refer to

GI-43, "Circuit Inspection"

Is the inspection result normal?

YES

>> Go to 3.

>> Repair or replace ground connection.

CHECK ECM GROUND CIRCUIT

Disconnect ECM harness connector.

Check the continuity between ECM harness connector and ground.

Also check harness for short to power.

Is the inspection result normal?

YES

>> Go to 4.

>> Repair or replace malfunctioning part.

CHECK ECM POWER SUPPLY-1

Reconnect ECM harness connector.

Turn ignition switch ON.

Check the voltage between ECM harness connector and ground.

Is the inspection result normal?

Location

Fuse No.

Capacity

IPDM E/R

#52

15 A

#65

5 A

Ground

Continuity

ECM

Connector

Terminal

F15

Ground

Existed

F16

E57

123

125

128

ECM

Voltage

(Approx.)

Connector

−

Terminal

E57

121

128

Battery voltage

Qashqai J11. Engine control system (MR20DD) - part 9