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EC-152 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] TROUBLE DIAGNOSIS - SPECIFICATION VALUE NOTE: Check “A/F ALPHA-B1”, “A/F ALPHA-B2” 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. 2. CHECK “B/FUEL SCHDL” Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is 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” mode, and check that the indication is 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”, “A/F ALPHA-B2” 1. Stop the engine. 2. Disconnect PCV hose, and then plug it. 3. Start engine. 4. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that each 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 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- ditions. >> INSPECTION END 6. CHECK FUEL PRESSURE Check fuel pressure. (Refer to 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 , 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. YES >> Replace “fuel filter and fuel pump assembly” and then GO TO 8. (Refer to NO >> Repair or replace malfunctioning part and then GO TO 8. |