2011 NISSAN LATIO Service Repair Manual

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NISSAN LATIO 2011 Service Repair Manual TROUBLE DIAGNOSIS - SPECIFICATION VALUEEC-115
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Diagnosis ProcedureINFOID:0000000005929797
OVERALL SEQUENCE
PBIB2318E
Revision: May 2010

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DETAILED PROCEDURE
1.CHECK “A/F ALPHA-B1”
With CONSULT-III
1. Start engine.
2. Confirm that the testing conditions ar

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NOTE:
Check “A/F ALPHA-B1” for approximately 1 minute because
it may fluctuate. It i

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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 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” m ode, 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” m ode, 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 gas oline 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 detect ed after changing engine oil or changing driving con-
dition.
>>INSPECTION END
6.CHECK FUEL PRESSURE
Check fuel pressure. (Refer to EC-499, "
Inspection".)
Is the inspection result normal?
YES >> GO TO 9.
NO-1 >> Fuel pressure is too high: Replace “fuel leve l sensor unit, fuel filter and pump assembly” (refer to
FL-6, "
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 level sensor unit, f uel filter and pump assembly” (refer to FL-6, "Removal and Instal-
lation") and then GO TO 8.
NO >> Repair or replace and then GO TO 8.
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TROUBLE DIAGNOSIS - SPECIFICATION VALUE
8.CHECK “A/F ALPHA-B1”
1. Start engine.
2. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITO R” mode, and m

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TROUBLE DIAGNOSIS - SPECIFICATION VALUE
8.CHECK “A/F ALPHA-B1”
1. Start engine.
2. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITO R” mode, and make sure that the indication is within
the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> GO TO 9.
9.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 12.
NO >> GO TO 10.
10.DETECT MALFUNCTIONING PART
Check the following.
1. Ignition coil and its circuit (Refer to EC-442, "
Component Function Check".)
2. Fuel injector and its circuit (Refer to EC-433, "
Component Function Check".)
3. Intake air leakage
4. Low compression pressure (Refer to EM-22, "
Inspection".)
Is the inspection result normal?
YES >> Replace fuel injector (refer to EM-33, "Exploded View") and then GO TO 11.
NO >> Repair or replace malfunctioning part and then GO TO 11.
11 .CHECK “A/F ALPHA-B1”
1. Start engine.
2. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITO R” mode, and make sure that the indication is within
the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> 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 EC-185, "
DTC Logic".
• For DTC P0131, refer to EC-191, "
DTC Logic".
• For DTC P0132, refer to EC-196, "
DTC Logic".
• For DTC P0133, refer to EC-201, "
DTC Logic".
• For DTC P2A00, refer to EC-420, "
DTC Logic".
Is any DTC detected?
YES >> GO TO 15.
NO >> 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”
1. Start engine.
2. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITO R” mode, and make sure that the indication is within
the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> GO TO 15.
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15.DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR
1. Stop the engine.
2. Disconnect ECM h

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15.DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR
1. Stop the engine.
2. Disconnect ECM harness connector.
3. Check pin terminal and connector for damage, and then reconnect it.
>> GO TO 16.
16.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 >> INSPECTION END
NO >> Detect malfunctioning part according to EC-488, "
Symptom Table".
17.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” m ode, 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
1. 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.
2. 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.
NO >> 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
each indication is within the SP value.
Is the measurement value within the SP value?
YES >> INSPECTION END
NO >> “B/FUEL SCHDL” is more, “A/F ALPHA-B1” is less than the SP value: GO TO 21.
21.DISCONNECT AND RECONNECT MASS AI R FLOW SENSOR HARNESS CONNECTOR
1. Stop the engine.
2. Disconnect mass air flow sensor harness connector.
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NISSAN LATIO 2011 Service Repair Manual EC-120
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TROUBLE DIAGNOSIS - SPECIFICATION VALUE
3. Check pin terminal and connector for damage and then reconnect it again.
>> GO TO 22.
22.CHECK “A/F ALPHA-B1”
1. S

EC-120
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TROUBLE DIAGNOSIS - SPECIFICATION VALUE
3. Check pin terminal and connector for damage and then reconnect it again.
>> GO TO 22.
22.CHECK “A/F ALPHA-B1”
1. Start engine.
2. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITO R” 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-150, "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 (refer to EM-25, "
Exploded View"), and
then GO TO 29.
24.REPLACE ECM
1. Replace ECM.
2. Perform EC-23, "
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 (refer to EM-25, "
Exploded View"), 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
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NISSAN LATIO 2011 Service Repair Manual TROUBLE DIAGNOSIS - SPECIFICATION VALUEEC-121
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• Open stuck, breakage, hose disconnection, or cracks of PCV valve
• Disconnection or

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NISSAN LATIO 2011 Service Repair Manual EC-122
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TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT
TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT
DescriptionINFOID:0000000005929798
Intermittent incidents may occur. In

EC-122
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TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT
TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT
DescriptionINFOID:0000000005929798
Intermittent incidents may occur. In many cases, the ma lfunction resolves itself (the part or circuit function
returns to normal without intervention). It is important to realize that the symptoms described in the customer's
complaint often do not recur on (1st trip) DTC visits. R ealize also that the most frequent cause of Intermittent
Incidents occurrences is poor electrical connections. Because of this, the conditions under which the incident
occurred may not be clear. Therefore, circuit checks made as part of the standard diagnostic procedure may
not indicate the specific malfunctioning area.
Common Intermittent Incidents Report Situations
Diagnosis ProcedureINFOID:0000000005929799
1.INSPECTION START
Erase (1st trip) DTCs.
Refer to “SELF-DIAGNOSTIC RESULTS MODE”, “How to Erase Self diagnostic Results” in EC-103, "
On
Board Diagnosis Function" (Without CONSULT-III) or EC-106, "CONSULT-III Function" (With CONSULT-III).
>> GO TO 2.
2.CHECK GROUND TERMINALS
Check ground terminals for corroding or loose connection.
Refer to EC-127, "
Ground Inspection".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace malfunctioning part.
3.SEARCH FOR ELECTRICAL INCIDENT
Perform GI-25, "
How to Perform Efficient Diagnosis for an Electrical Incident", “INCIDENT SIMULATION
TESTS”.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace malfunctioning part.
4.CHECK CONNECTOR TERMINALS
Refer to GI-22, "
How to Check Terminal", “HOW TO PROBE CONNECTORS”, “How to Check Enlarged Con-
tact Spring of Terminal”.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace connector.
STEP in Work Flow Situation
2 The CONSULT-III is used. The SELF DIAGNOSTIC RESULT screen shows time data other than 0 or [1t].
3 or 4 The symptom described by the customer does not recur.
5 (1st trip) DTC does not appear during the DTC Confirmation Procedure.
10 The Diagnostic Procedure for PXXXX does not indicate the malfunctioning area.
Revision: May 2010 2011 Versa

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