Nissan Qashqai (2007-2010). Manual — part 231

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-443

< COMPONENT DIAGNOSIS >

[HR16DE (WITHOUT EURO-OBD)]

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22.

CHECK “A/F ALPHA-B1”

1.

Start engine.

2.

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

EC-456, "DTC

Logic"

. Then GO TO 29.

NO

>> GO TO 23.

23.

CHECK “MAS A/F SE-B1”

Select “MAS A/F SE-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 24.

NO

>> More than the SP value: Replace mass air flow sensor, and then GO TO 29.

24.

REPLACE ECM

1.

Replace ECM.

2.

Go to

EC-368, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-

ment"

.

>> GO TO 29.

25.

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 27.

NO

>> 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

NO

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

27.

CHECK “MAS A/F SE-B1”

Select “MAS A/F SE-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 28.

NO

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

EC-444

< COMPONENT DIAGNOSIS >

[HR16DE (WITHOUT EURO-OBD)]

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

NO

>> Detect malfunctioning part according to

EC-623, "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

NO

>> Detect malfunctioning part according to

EC-623, "Symptom Table"

.

POWER SUPPLY AND GROUND CIRCUIT

EC-445

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[HR16DE (WITHOUT EURO-OBD)]

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POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000001096779

1.

INSPECTION START

Start engine.
Is engine running?

YES

>> GO TO 8.

NO

>> GO TO 2.

2.

CHECK ECM POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF and then ON.

2.

Check the voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E105, M77
• 10A fuse (No. 4)
• Harness for open or short between ECM and fuse

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK GROUND CONNECTION-I

1.

Turn ignition switch OFF.

2.

Check ground connection E21. Ground Inspection in

GI-41, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace ground connection.

5.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I

1.

Disconnect ECM harness connectors.

2.

Check the continuity between ECM harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F121, E7
• Harness for open or short between ECM and ground

ECM

Ground

Voltage

Connector

Terminal

E16

93

Ground

Battery voltage

ECM

Ground

Continuity

Connector

Terminal

F7

10

Ground

Existed

11

E16

108

EC-446

< COMPONENT DIAGNOSIS >

[HR16DE (WITHOUT EURO-OBD)]

POWER SUPPLY AND GROUND CIRCUIT

>> Repair open circuit or short to power in harness or connectors.

7.

CHECK ECM POWER SUPPLY CIRCUIT-II

1.

Reconnect ECM harness connectors.

2.

Turn ignition switch ON.

3.

Check the voltage between IPDM E/R harness connector and ground.

Is the inspection result normal?

YES

>> Go to

EC-588, "Diagnosis Procedure"

.

NO

>> GO TO 8.

8.

CHECK ECM POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Check the voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 15.

NO-1

>> Battery voltage does not exist: GO TO 9.

NO-2

>> Battery voltage exists for more than a few seconds: GO TO 12.

9.

CHECK ECM POWER SUPPLY CIRCUIT-IV

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Check the voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 12.

10.

CHECK ECM POWER SUPPLY CIRCUIT-V

1.

Disconnect ECM harness connector.

2.

Disconnect IPDM E/R harness connector E11.

3.

Check the continuity between ECM harness connector and IPDM E/R harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Repair open circuit or short to ground or short power in harness or connectors.

11.

CHECK ECM POWER SUPPLY CIRCUIT-VI

IPDM E/R

Ground

Voltage

Connector

Terminal

E11

15

Ground

Battery voltage

ECM

Ground

Voltage

Connector

Terminal

E16

105

Ground

After turning ignition switch OFF, battery volt-
age will exist for more than a few seconds,
then drop approximately 0V.

ECM

Ground

Voltage

Connector

Terminal

F7

32

Ground

Battery voltage

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E16

105

E11

9

Existed