DTC P0101: Mass Air Flow Circuit Range / Performance Problem [08/2015 - ]: 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 and ECT / Trouble Codes.
5. Read the DTCs.
   RESULT
   
   

   Result	Proceed to
   P0101 is output	A
   P0101 and other DTCs are output	B

   HINT: 

   If any DTCs other than P0101 are output, troubleshoot those DTCs first.

Result: 

B 

GO TO DTC CHART 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 08/2016] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2016 - 08/2017] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2017 - 08/2019] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2019 - 08/2020] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2020 - 08/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2021 - 08/2022] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2022 - ] )

Result: 

A 

See step  2

1. Check the intake system for vacuum leaks (Refer to PROCEDURE - Step 3 ).

   OK

   No leaks in intake system.

   HINT: 

   Perform "Inspection After Repair" after repairing or replacing the intake system (Refer to INITIALIZATION [08/2015 - ] ).

Result: 

NG 

REPAIR OR REPLACE INTAKE SYSTEM 

Result: 

OK 

See step  3

1. Check the PCV hose connections.

   OK

   PCV hose is connected correctly and is not damaged.

Result: 

NG 

REPAIR OR REPLACE PCV HOSE 

(Refer to REMOVAL [08/2015 - ] )

Result: 

OK 

See step  4

1. Connect the Techstream to the DLC3.
2. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

   HINT: 

   • When performing the Active Test, make sure the shift lever is in P or N.
   • The A/C switch and all accessory switches should be off.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
5. Confirm that Throttle Idle Position is ON and check the engine idling condition and the value of MAP in the Data List while performing the Active Test.

   HINT: 

   • Do not leave the EGR valve open for 10 seconds or more during the Active Test.
   • Be sure to return the EGR valve to step 0 when the Active Test is completed.

   OK

   MAP and idling condition change in response to EGR step position as follows.

   Standard

   -	EGR Step Position (Active Test)
   	Step 0	Step 0 to 30
   Idling condition	Steady idling	Idling changes from steady to rough idling or engine stalls
   MAP (Data List)	20 to 40 kPa (150 to 300 mmHg)	MAP value is at least 10 kPa (75 mmHg) higher than when EGR valve is fully closed

Result: 

OK 

See step  6

Result: 

NG 

See step  5

1. Remove the EGR valve assembly (Refer to REMOVAL [08/2015 - ] ).
2. Check if the EGR valve is stuck open.

   OK

   EGR valve is tightly closed.

   HINT: 

   Perform "Inspection After Repairs" after replacing the EGR valve assembly (Refer to INITIALIZATION [08/2015 - ] ).

Result: 

NG 

REPLACE EGR VALVE ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )

Result: 

OK 

See step  6

1. Replace the mass air flow meter assembly (Refer to REMOVAL [08/2015 - ] ).

   HINT: 

   Perform "Inspection After Repairs" after replacing the mass air flow meter assembly (Refer to INITIALIZATION [08/2015 - ] ).

Result: 

NEXT 

See step  7

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - ] ).
5. Turn the engine switch off and wait for 30 seconds.
6. Turn the engine switch on (IG) and turn the Techstream on.
7. Start the engine and warm it up.
8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
10. Input the DTC: P0101.
11. Check the DTC judgment result.
    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
    N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Result: 

NEXT 

END