DTC P0101: Mass Air Flow Circuit Range / Performance Problem [01/2019 - 03/2019]: Procedure

WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, 2020 Toyota Corolla, and 2019 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Read the DTCs.

Powertrain > Engine and ECT > Trouble Codes

Result

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

HINT:

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

Result:

GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [01/2019 - 03/2019]

Result:

See step 2

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Refer to ON-VEHICLE INSPECTION [01/2019 - 11/2022]

No leaks from intake system.

HINT:

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

Refer to INITIALIZATION [01/2019 - 11/2022]

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE INTAKE SYSTEM

Result:

See step 3

CHECK PCV HOSE CONNECTIONS

Check the PCV hose connections.

Refer to COMPONENTS [01/2019 - 11/2022]

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

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE PCV HOSE

Result:

See step 4

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

Replace the mass air flow meter sub-assembly.

Refer to REMOVAL [01/2019 - 11/2022]

HINT:

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

Refer to INITIALIZATION [01/2019 - 11/2022]

Result

Proceed to
NEXT

Result:

See step 5

CLEAR DTC

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Clear the DTCs.
Powertrain > Engine and ECT > Clear DTCs

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

Result

Proceed to
NEXT

Result:

See step 6

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

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

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

Powertrain > Engine and ECT > Utility

Tester Display
All Readiness

Input the DTC: P0101.

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

Proceed to
NEXT

Result:

END