Nissan Rogue (T33) 2021-Present Service Manual: P04db Crankcase Ventilation System
DTC Description
DTC DETECTION LOGIC
| DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition | ||
| P04DB | 00 |
Crankcase Ventilation System Hose Disconnection (Crankcase Ventilation System Disconnected) |
Diagnosis condition | The intake system failuer ratio exceeds specified value. |
| Signal | — | |||
| Threshold | The intake system failuer ratio exceeds specified value. | |||
| Diagnosis delay time | 10 seconds | |||
POSSIBLE CAUSE
-
PCV hose failure
-
PCV valve failure
-
Intake air leaks
-
Intake system failure
(Mass air flow sensor, electric throttle control actuator, intake manifold)
-
Fuel system failure
[Incorrect fuel pressure, fuel injector, air fuel ratio (A/F) sensor 1]
FAIL-SAFE
Engine Control System
Not applicable
Stop/Start System
Not applicable
DTC CONFIRMATION PROCEDURE
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
-
Ignition switch OFF and wait at least 10 seconds.
-
Ignition switch ON.
-
Ignition switch OFF and wait at least 10 seconds.
>>
GO TO 2.
PERFORM DTC CONFIRMATION PROCEDURE
-
Start engine and warm it up to the normal operating temperature.
-
Let engine idle.
-
Check DTC.
Is DTC detected?
YES>>Proceed to DTC Diagnosis Procedure.
NO-1>>To check malfunction symptom before repair: Refer to Intermittent Incident.
NO-2>>Confirmation after repair: INSPECTION END
DTC Diagnosis Procedure
CHECK FOR INTAKE AIR LEAK
-
Listen for an intake air leak after the mass air flow sensor.
-
Check the following.
-
Air leak from intake pipe or intake hose
-
Incorrect PCV hose connection
-
Air leak from electric throttle control actuator
-
Air leak from intake manifold
-
Is intake air leak detected?
YES>>GO TO 2.
NO>>Repair or replace malfunctioning part.
CHECK OIL LEVEL GAUGE
Check installation condition of oil level gauge.
Is the inspection result normal?
YES>>GO TO 3.
NO>>Repair or replace error-detected parts.
CHECK BLOW-BY HOSE
Check blow-by hose (fresh air hose and PCV valve hose) for disconnected or damege.
Is the inspection result normal?
YES>>GO TO 4.
NO>>Repair or replace error-detected parts.
CHECK CRANKCASE, ROCKER COVER, AND FRONT COVER
Visually check crankcase, rocker cover, and front cover for damege.
Is the inspection result normal?
YES>>GO TO 5.
NO>>Replace the error-detected parts.
CHECK PCV VALVE
Check the PCV valve. Refer to POSITIVE CRANKCASE VENTILATION : Periodic Maintenance.
Is the inspection result normal?
YES>>GO TO 6.
NO>>Replace PCV valve. Refer to Exploded View.
CHECK CRANKCASE VENTILATION VALVE
Check crankcase ventilation valve. Refer to Component Inspection.
Is the inspection result normal?
YES>>GO TO 7.
NO>>Repair or replace error-detected parts.
CHECK CRANKCASE PRESSURE SENSOR
Check the crankcase pressure sensor. Refer to Component Inspection.
Is the inspection result normal?
YES>>GO TO 8.
NO>>Replace crankcase pressure sensor. Refer to Exploded View.
CHECK AIR FUEL RATIO (A/F) SENSOR 1
Check air fuel ratio (A/F) sensor 1. Refer to
Is the inspection result normal?
YES>>GO TO 9.
NO>>Repair or replace error-detected parts.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER
Check air fuel ratio (A/F) sensor 1 heater. Refer to Component Inspection.
Is the inspection result normal?
YES>>GO TO 10.
NO>>Repair or replace error-detected parts.
CHECK MASS AIR FLOW SENSOR
Check mass air flow sensor. Refer to Component Inspection.
Is the inspection result normal?
YES>>GO TO 11.
NO>>Repair or replace error-detected parts.
CHECK FUEL PRESSURE
Check fuel pressure. Refer to Work Procedure.
Is the inspection result normal?
YES>>GO TO 12.
NO>>GO TO 13.
DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal?
YES>>Replace “fuel level sensor unit and fuel pump”. Refer to Removal and Installation.
NO>>Repair or replace error-detected parts.
CHECK FUNCTION OF FUEL INJECTOR
With CONSULT
-
Start engine.
-
Perform “POWER BALANCE” in “Active test” mode of “ECM”.
-
Make sure that each circuit produces a momentary engine speed drop.
Clicking sound should be heard.
Is the inspection result normal?
YES>>INSPECTION END
NO>>Perform trouble diagnosis for FUEL INJECTOR, Refer to Diagnosis Procedure.
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