DTC P04DB-00: Crankcase Ventilation System Disconnected [10/2015 - 11/2017]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Trouble Codes.
5. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTC P04DB-00 is output	A
   DTC P04DB-00 and P0171-00 and/or P0172-00 are output
   DTC P04DB-00 and other DTCs are output	B

   HINT: 

   • If DTC P04DB-00 and P0171-00 and/or P0172-00 are output simultaneously, troubleshoot for DTC P04DB-00 first.
   • If any DTCs other than P04DB-00 are output, troubleshoot those DTCs first.

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2015 - 08/2016]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2016 - 11/2017] 

Result: 

A 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the PCV hose connections.

   OK

   PCV valve and hose are connected correctly and are not damaged.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  18

Result: 

OK 

See step  3

1. Check the intake system for vacuum leaks.

   Refer to ON-VEHICLE INSPECTION [10/2015 - ]

   OK

   No leaks in intake system.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  17

Result: 

OK 

See step  4

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Turn the Techstream on.
4. Warm up the engine and run the engine at an engine speed of 2500 rpm for approximately 90 seconds.
5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2.

   Powertrain > Engine > Active Test 

   Active Test Display
   Control the Injection Volume for A/F Sensor

   Data List Display
   A/F (O2) Sensor Voltage B1S1
   O2 Sensor Voltage B1S2

6. Perform the Control the Injection Volume for A/F Sensor operation with the engine idling (change the fuel injection volume).
7. Monitor the voltage outputs of the air fuel ratio sensor and the heated oxygen sensor (A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2) displayed on the Techstream.

   HINT: 

   • Change the injection volume operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.
   • The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
   • If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

   Standard

   Techstream Display (Sensor)	Injection Volume	Status	Voltage
   A/F (O2) Sensor Voltage B1S1 (Air fuel ratio)	+12.5%	Rich	Below 3.1 V
   	-12.5%	Lean	Higher than 3.4 V
   O2 Sensor Voltage B1S2 (Heated oxygen)	+12.5%	Rich	Higher than 0.55 V
   	-12.5%	Lean	Below 0.4 V

   Result

   Status A/F (O2) Sensor Voltage B1S1	Status O2 Sensor Voltage B1S2	Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition	Suspected Trouble Area	Proceed to
   Lean/Rich	Lean/Rich	Normal	-	A
   Lean	Lean	Actual air fuel ratio lean	PCV valve and hose PCV hose connections Gas leak from exhaust system Intake system Mass air flow meter sub-assembly Engine coolant temperature sensor
   Rich	Rich	Actual air fuel ratio rich	Gas leak from exhaust system Ignition system Mass air flow meter sub-assembly Engine coolant temperature sensor
   Lean	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor	B
   Rich	Lean/Rich	Air fuel ratio sensor malfunction	Air fuel ratio sensor

   1. Lean: During Control the Injection Volume for A/F Sensor, the air fuel ratio sensor output voltage (A/F (O2) Sensor Voltage B1S1) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2) is consistently below 0.4 V.
   2. Rich: During Control the Injection Volume for A/F Sensor, the A/F (O2) Sensor Voltage B1S1 is consistently below 3.1 V, and the O2 Sensor Voltage B1S2 is consistently higher than 0.55 V.
   3. Lean/Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the output voltage of the air fuel ratio sensor or heated oxygen sensor alternates correctly.

   HINT: 

   Refer to "Data List / Active Test" [A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2].

   Refer to DATA LIST / ACTIVE TEST [10/2015 - 08/2016] , or refer to DATA LIST / ACTIVE TEST [08/2016 - 11/2017]

Result: 

B 

See step  8

Result: 

A 

See step  5

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

5. Read the Data List twice, when the engine is both cold and warmed up.

   Standard

   Techstream Display	Condition	Specified Condition
   Coolant Temperature	Cold engine	Same as ambient air temperature
   	Warm engine	Between 75 and 100°C (167 and 212°F)

   HINT: 

   Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

   Refer to INITIALIZATION [10/2015 - 10/2018]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL [10/2015 - ] 

Result: 

OK 

See step  6

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Turn the Techstream 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

   Techstream Display	Condition	Specified Condition
   Mass Air Flow Sensor	Engine warmed up Shift lever position: P A/C: Off Engine Speed: 3000 rpm	Between 6.0 gm/sec and 18.0 gm/sec

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  12

Result: 

OK 

See step  7

1. Check for exhaust gas leaks.

   OK

   No gas leaks.

   HINT: 

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

   Refer to INITIALIZATION [10/2015 - 10/2018]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  11

Result: 

NG 

REPAIR OR REPLACE EXHAUST SYSTEM 

1. Inspect the air fuel ratio sensor.

   Refer to INSPECTION [10/2015 - ]

   HINT: 

   Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

   Refer to INITIALIZATION [10/2015 - 10/2018]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE AIR FUEL RATIO SENSOR. Refer to  REMOVAL [10/2015 - ] 

Result: 

OK 

See step  9

1. Disconnect the air fuel ratio sensor 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
   F52-1 (HA1A) - F67-19 (HA1A)	Always	Below 1 Ω
   F52-3 (A1A+) - F67-131 (A1A+)	Always	Below 1 Ω
   F52-4 (A1A-) - F67-132 (A1A-)	Always	Below 1 Ω
   F52-1 (HA1A) or F67-19 (HA1A) - Body ground and other terminals	Always	10 kΩ or higher
   F52-3 (A1A+) or F67-131 (A1A+) - Body ground and other terminals	Always	10 kΩ or higher
   F52-4 (A1A-) or F67-132 (A1A-) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  10

1. Replace the air fuel ratio sensor.

   Refer to REMOVAL [10/2015 - ]

   HINT: 

   Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

   Refer to INITIALIZATION [10/2015 - 10/2018]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  11

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

5. Turn the engine switch off and wait for at least 30 seconds.
6. Start the engine and warm it up.
7. Turn the Techstream on.
8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

10. Input the DTC: P04DB-00.
11. Check the DTC judgment result.

    Result

    Result	Proceed to
    ABNORMAL (DTC P04DB-00 is output)	A
    NORMAL (DTCs are not output)	B

Result: 

B 

END 

Result: 

A 

See step  12

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

   Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2014 - ]

   HINT: 

   Repair any problems.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  13

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

5. Turn the engine switch off and wait for at least 30 seconds.
6. Start the engine and warm it up.
7. Turn the Techstream on.
8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

10. Input the DTC: P04DB-00.
11. Check the DTC judgment result.

    Result

    Result	Proceed to
    ABNORMAL (DTC P04DB-00 is output)	A
    NORMAL (DTCs are not output)	B

Result: 

B 

END 

Result: 

A 

See step  14

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
   F38-5 (VG) - F67-92 (VG)	Always	Below 1 Ω
   F38-4 (E2G) - F67-91 (E2G)	Always	Below 1 Ω
   F38-5 (VG) or F67-92 (VG) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  15

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

   Refer to REMOVAL [10/2015 - ]

   HINT: 

   • If the result of the inspection performed in step 6 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.

     Refer to INITIALIZATION [10/2015 - 10/2018]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  16

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

5. Turn the engine switch off and wait for at least 30 seconds.
6. Start the engine and warm it up.
7. Turn the Techstream on.
8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

10. Input the DTC: P04DB-00.
11. Check the DTC judgment result.

    Result

    Result	Proceed to
    ABNORMAL (DTC P04DB-00 is output)	A
    NORMAL (DTCs are not output)	B

Result: 

A 

REPLACE ECM. Refer to  REMOVAL [10/2015 - ] 

Result: 

B 

END 

1. Repair or replace the intake system.

   HINT: 

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

   Refer to INITIALIZATION [10/2015 - 10/2018]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  19

1. Repair or replace the PCV hose.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  19

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

5. Turn the engine switch off and wait for at least 30 seconds.
6. Start the engine and warm it up.
7. Turn the Techstream on.
8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

10. Input the DTC: P04DB-00.
11. Check the DTC judgment result.

    Techstream 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

Result: 

NEXT 

END