SFI SYSTEM(for Rear Air Fuel Ratio Sensor), Diagnostic DTC:P04DB00

DTC Code DTC Name
P04DB00 Crankcase Ventilation System Disconnected

DESCRIPTION

Tech Tips

This DTC is applicable to w/ Canister Pump Module only.

In the PCV system for a turbocharged engine, the blow-by gas is drawn into the intake pipe due to the intake vacuum via the PCV valve in the natural aspiration range, and blow-by gas forcibly flows through the intake pipe via the ejector to recirculate blow-by in all driving ranges in the turbocharged intake range.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P04DB00 Crankcase Ventilation System Disconnected PCV system air leakage is detected (2 trip detection logic).

  • PCV valve and hose

  • PCV hose connections

  • Intake system

  • No. 1 turbo pressure sensor

  • No. 2 turbo pressure sensor

  • Mass air flow meter sub-assembly

  • Wire harness or connector

  • ECM

 Comes on DTC stored SAE Code: P04DB

MONITOR DESCRIPTION

The ECM monitors for PCV system air leakage and suction.

While the vehicle is being driven, if the difference between the intake air volume calculated from the output of the mass air flow meter sub-assembly and that calculated from the output of the No. 1 turbo pressure sensor is higher than the threshold (air leakage) or lower than the threshold (suction) in 2 consecutive driving cycles, the ECM will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Required Sensors/Components (Main) PCV system
Required Sensors/Components (Related)

Mass air flow meter sub-assembly

Crankshaft position sensor

No. 1 turbo pressure sensor

No. 2 turbo pressure sensor
Frequency of Operation Once per driving cycle

TYPICAL ENABLING CONDITIONS

All
All of the following conditions are met -
Vehicle speed More than 3 km/h (1.875 mph)
Temperature in the surge tank -10 to 80°C (14 to 176°F)
Engine speed 1500 to 3000 rpm
Shift position 2nd or higher
Ejector Hose Upstream Side Disconnection
Both of the following conditions are met -
Air amount 0.85 to 1.4 g/rev
Turbo pressure 10 kPa (1.45 psi) or higher
Ejector Hose Downstream Side or Fresh Air Hose Disconnection
Air amount 0.9 to 1.4 g/rev

TYPICAL MALFUNCTION THRESHOLDS

All
Accumulated number of air amount ratio 300 counts or more
Ejector Hose Upstream Side Disconnection
Average air amount calculated based on air flow meter / average air amount calculated based on intake manifold pressure Higher than 1.22
Ejector Hose Downstream Side or Fresh Air Hose Disconnection
Average air amount calculated based on air flow meter / average air amount calculated based on intake manifold pressure Less than 0.84

CONFIRMATION DRIVING PATTERN

B007YCYE01

  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  5. Turn the engine switch off and wait for at least 30 seconds.

  6. Turn the engine switch on (IG).

  7. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off [A].

  8. Accelerate the vehicle to 50 km/h (31 mph) or more [B].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  9. Accelerate the vehicle from 50 to 80 km/h (31 to 50 mph) for 10 seconds or more [C].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    Tech Tips

    Accelerate with a constant accelerator pedal opening angle.

  10. Drive the vehicle at 80 km/h (50 mph) or more for 5 seconds or more [D].

  11. Allow the vehicle to decelerate until the vehicle speed decreases to approximately 50 km/h (31 mph) [E].

  12. Repeat steps [B] through [E] 4 times or more.

  13. Enter the following menus: Powertrain / Engine / Trouble Codes [F].

  14. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  15. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  16. Input the DTC: P04DB00.

  17. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE, perform steps [B] through [F] again.

WIRING DIAGRAM

Refer to DTC P010012 for the mass air flow meter sub-assembly circuit.

Click here

CAUTION / NOTICE / HINT

Tech Tips

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P04DB00)


    1. Connect the GTS to the DLC3

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P04DB00 is output A
      DTC P04DB00 and P017100 and/or P017200 are output
      DTC P04DB00 and other DTCs are output B

      Tech Tips


      • If DTC P04DB00 and P017100 and/or P017200 are output simultaneously, troubleshoot for DTC P04DB00 first.

      • If any DTCs other than P04DB00 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK PCV HOSE CONNECTIONS


    1. Check the PCV hose connections.

      B008049
      OK
      PCV valve and hose are connected correctly and are not damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE PCV HOSE Click here

    OK

  3. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks.

      Click here

      OK
      No leaks in intake system.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE INTAKE SYSTEM Click here

    OK

  4. INSPECT NO. 1 TURBO PRESSURE SENSOR


    1. Inspect the No. 1 turbo pressure sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 TURBO PRESSURE SENSOR Click here

    OK

  5. INSPECT NO. 2 TURBO PRESSURE SENSOR


    1. Inspect the No. 2 turbo pressure sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 TURBO PRESSURE SENSOR Click here

    OK

  6. READ VALUE USING GTS (MASS AIR FLOW SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.


      Powertrain > Engine > Data List
      Tester Display
      Engine Speed
      Mass Air Flow Sensor
      Coolant Temperature

    5. Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher.

    6. Read Mass Air Flow Sensor while maintaining an engine speed of 3000 rpm.

      Standard
      GTS Display Condition Specified Condition
      Mass Air Flow Sensor

      • Shift lever position: P

      • A/C: Off

      • Engine warmed up

      • Engine Speed: 3000 rpm

      		 Between 6.0 and 18.0 gm/sec
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) Click here

    OK

  7. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P04DB00)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Utility / All Readiness.


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    3. Input the DTC: P04DB00.

    4. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P04DB00 is output)

      		 B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE ECM Click here

  9. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)


    1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

      Click here

      Tech Tips

      Repair any problems.

      Result
      Proceed to
      NEXT

    NEXT

  10. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK WHETHER DTC OUTPUT RECURS (DTC P04DB00)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Utility / All Readiness.


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    3. Input the DTC: P04DB00.

    4. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P04DB00 is output)

      		 B

    A

    END

    B

  12. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)


    1. Disconnect the mass air flow meter sub-assembly connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D9-5 (VG) - D1-92 (VG) Always Below 1 Ω
      D9-4 (E2G) - D1-91 (E2G) Always Below 1 Ω
      D9-5 (VG) or D1-92 (VG) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY


    1. Replace the mass air flow meter sub-assembly.

      Click here

      Tech Tips


      • If the result of the inspection performed in step 6 (READ VALUE USING GTS (MASS AIR FLOW SENSOR)) indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.

      • Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

  14. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  15. CHECK WHETHER DTC OUTPUT RECURS (DTC P04DB00)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Utility / All Readiness.


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    3. Input the DTC: P04DB00.

    4. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P04DB00 is output)

      		 B

    A

    END

    B

    REPLACE ECM Click here

  16. REPAIR OR REPLACE INTAKE SYSTEM


    1. Repair or replace the intake system.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the intake system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 18 Click here

  17. REPAIR OR REPLACE PCV HOSE


    1. Repair or replace the PCV hose.

      Result
      Proceed to
      NEXT

    NEXT

  18. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  19. CHECK WHETHER DTC OUTPUT RECURS (DTC P04DB00)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Utility / All Readiness.


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    3. Input the DTC: P04DB00.

    4. Check the DTC judgment result.

      GTS Display Description
      NORMAL

      • DTC judgment completed

      • System normal
      ABNORMAL

      • DTC judgment completed

      • System abnormal
      INCOMPLETE

      • DTC judgment not completed

      • Perform driving pattern after confirming DTC enabling conditions
      Result
      Proceed to
      NEXT

    NEXT

    END