NISSAN LATIO 2009 Service Repair Manual

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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. YES >> GO TO 4.
NO >> More than the SP value: GO TO 19. YES >> GO TO 6.
NO-1 >> More than the SP value: GO TO 6.
NO-2 >> Less than the SP value: GO TO 25. YES >> GO TO 5.
NO >> GO TO 6. Inspection " .)
Is the inspection result normal? YES >> GO TO 9.
NO-1 >> Fuel pressure is too high: Replace “fuel filter and fuel pump assembly” and then GO TO 8.
NO-2 >> Fuel pressure is too low: GO TO 7. YES >> Replace “fuel filter and fuel pump assembly” and then GO TO 8.
NO >> Repair or replace and then GO TO 8.

YES >> INSPECTION END
NO >> GO TO 9. YES >> GO TO 12.
NO >> GO TO 10. Component Function Check " .)
2. Fuel injector and its circuit (Refer to EC-430, " Component Function Check " .)
3. Intake air leakage
4. Low compression pressure (Refer to EM-23, " Inspection " .)
Is the inspection result normal? YES >> Replace fuel injector and then GO TO 11.
NO >> Repair or replace malfunctioning part and then GO TO 11. YES >> INSPECTION END
NO >> GO TO 12. DTC Logic " .
• For DTC P0131, refer to EC-188, " DTC Logic " .
• For DTC P0132, refer to EC-193, " DTC Logic " .
• For DTC P0133, refer to EC-198, " DTC Logic " .
• For DTC P2A00, refer to EC-417, " DTC Logic " .
Is any DTC detected? YES >> GO TO 15.
NO >> GO TO 13. YES >> INSPECTION END
NO >> GO TO 15.

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2. Disconnect ECM harness connector.
3. Check pin terminal and connector for damage, and then reconnect it.
>> GO TO 16. YES >> INSPECTION END
NO >> Detect malfunctioning part according to EC-487, " Symptom Table " .
YES >> INSPECTION END
NO-1 >> More than the SP value: GO TO 18.
NO-2 >> Less than the SP value: GO TO 25. YES >> GO TO 21.
NO >> Repair or replace malfunctioning part, and then GO TO 20. YES >>
INSPECTION END
NO >> “B/FUEL SCHDL” is more, “A/F ALPHA-B1” is less than the SP value: GO TO 21.

YES >> Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to
EC-148, " DTC
Logic " . Then GO TO 29.
NO >> GO TO 23. YES >> GO TO 24.
NO >> More than the SP value: Replace mass air flow sensor, and then GO TO 29. ADDITIONAL SERVICE WHEN REPLACING CO
NTROL UNIT : Special Repair Require-ment " .
>> GO TO 29. YES >> GO TO 27.
NO >> Repair or replace malfunctioning part, and then GO TO 26. YES >> INSPECTION END
NO >> Less than the SP value: GO TO 27. YES >> GO TO 28.
NO >> Less than the SP value: Replace mass air flow sensor, and then GO TO 30.

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• Malfunctioning seal of intake air system, etc.
>> GO TO 30. YES >> INSPECTION END
NO >> Detect malfunctioning part according to EC-487, " Symptom Table " .
YES >> INSPECTION END
NO >> Detect malfunctioning part according to EC-487, " Symptom Table " .

Diagnosis Description " , “DTC AND FREEZE FRAME DATA”, “How to Erase DTC and 1st Trip
DTC”.
>> GO TO 2. Ground Inspection " .
OK or NG OK >> GO TO 3.
NG >> Repair or replace malfunctioning part. 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. 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.

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POWER SUPPLY AND GROUND CIRCUIT
Wiring Diagram INFOID:0000000004780556
Diagnosis Procedure INFOID:0000000004780045

YES >> GO TO 8.
NO >> GO TO 2. YES >> GO TO 4.
NO >> GO TO 3. Ground Inspection " .
Is the inspection result normal? YES >> GO TO 5.
NO >> Repair or replace ground connection. YES >> GO TO 7.
NO >> GO TO 6.

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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-441, " Diagnosis Procedure " .
NO >> GO TO 8. YES >> GO TO 14.
NO-1 >> Battery voltage does not exist: GO TO 9.
NO-2 >> Battery voltage exists for more than a few seconds: GO TO 11. YES >> GO TO 10.
NO >> GO TO 11. YES >> GO TO 17.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.

YES >> GO TO 13.
NO >> GO TO 12. YES >> GO TO 17.
NO >> Replace 20 A fuse. Ground Inspection " .
Is the inspection result normal? YES >> GO TO 15.
NO >> Repair or replace ground connection. YES >> GO TO 17.
NO >> GO TO 16. ECM
Ground Continuity
Connector Terminal
F10 10
Ground Existed
11
E16 108