2010 NISSAN LATIO Service Repair Manual

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NISSAN LATIO 2010 Service Repair Manual EC-112
< COMPONENT DIAGNOSIS >[HR16DE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
22.CHECK “A/F ALPHA-B1”
1. Start engine.
2. Select “A/F ALPHA-B1” in “SPEC” of “DATA MONITO R” mode, and

EC-112
< COMPONENT DIAGNOSIS >[HR16DE]
TROUBLE DIAGNOSIS - SPECIFICATION VALUE
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-142, "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. 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, 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 disconnecti on, or cracks of PCV valve
• Disconnection or cracks of EVAP purge hose, open stuc k 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
Revision: January 20102010 Versa

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NISSAN LATIO 2010 Service Repair Manual TROUBLE DIAGNOSIS - SPECIFICATION VALUEEC-113
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• Malfunctioning seal of intake air system, etc.
>> GO TO 30.
29.CHECK “A/F ALPHA-B1�

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NISSAN LATIO 2010 Service Repair Manual EC-114
< COMPONENT DIAGNOSIS >[HR16DE]
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT
TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT
DescriptionINFOID:0000000005398283
Intermittent incidents may occur. In

EC-114
< COMPONENT DIAGNOSIS >[HR16DE]
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT
TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT
DescriptionINFOID:0000000005398283
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:0000000005398284
1.INSPECTION START
Erase (1st trip) DTCs.
Refer to EC-84, "
Diagnosis Description", “DTC AND FREEZE FRAME DATA”, “How to Erase DTC and 1st Trip
DTC”.
>> GO TO 2.
2.CHECK GROUND TERMINALS
Check ground terminals for corroding or loose connection.
Refer to EC-119, "
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: January 20102010 Versa

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NISSAN LATIO 2010 Service Repair Manual POWER SUPPLY AND GROUND CIRCUITEC-115
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POWER SUPPLY AND GROUND CIRCUIT
Wiring DiagramINFOID:0000000005398285
Diagnosis ProcedureINFOID:0

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NISSAN LATIO 2010 Service Repair Manual EC-116
< COMPONENT DIAGNOSIS >[HR16DE]
POWER SUPPLY AND GROUND CIRCUIT
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.

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NISSAN LATIO 2010 Service Repair Manual POWER SUPPLY AND GROUND CIRCUITEC-117
< COMPONENT DIAGNOSIS > [HR16DE]
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2. Turn ignition switch ON.
3. Check the voltage between IPDM E/R harness connector and
ground.
I

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NISSAN LATIO 2010 Service Repair Manual EC-118
< COMPONENT DIAGNOSIS >[HR16DE]
POWER SUPPLY AND GROUND CIRCUIT
2. Disconnect IPDM E/R harness connector E43.
3. Check the continuity between ECM harnes
s connector and IPDM E/R harness connect

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NISSAN LATIO 2010 Service Repair Manual POWER SUPPLY AND GROUND CIRCUITEC-119
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Refer to
EC-114, "Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace IPDM E/R

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