DTC P0102: Mass Air Flow Circuit Low; DTC P0103: Mass Air Flow Circuit High [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 TERMINAL VOLTAGE (POWER SOURCE OF MASS AIR FLOW METER)
*a Front view of wire harness connector
(to Mass Air Flow Meter Sub-assembly)- Disconnect the mass air flow meter sub-assembly.
- Turn the ignition switch to ON.
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Switch Condition Specified Condition C26-3 (VCC) - C26-2 (E2G) Ignition switch ON 4.8 to 5.2 V C26-1 (FG) - C26-2 (E2G) Ignition switch ON 4.8 to 5.2 V Result
Proceed to OK NG
Result:
NG
See step 5
Result:
OK
See step 2
- 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:
NEXT
See step 3
- Replace the mass air flow meter sub-assembly.
- 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:
NEXT
See step 4
- CHECK WHETHER DTC OUTPUT RECURS (DTC P0102 OR P0103)
- Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
- Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
- Read the DTCs.
Powertrain > Engine and ECT > Trouble Codes
Result
Result Proceed to DTCs are not output A DTC P0102 and/or P0103 is output B
Result:
A
END
Result:
B
REPLACE ECM. Refer to REMOVAL [01/2019 - 03/2019]
- CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
- Disconnect the mass air flow meter sub-assembly connector.
- Disconnect the ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition C26-1 (FG) - C77-137 (VG) Always Below 1 Ω C26-2 (E2G) - C77-104 (E2G) Always Below 1 Ω C26-3 (VCC) - C77-103 (VCVG) Always Below 1 Ω C26-1 (FG) or C77-137 (VG) - Body ground and other terminals Always 10 kΩ or higher C26-3 (VCC) or C77-103 (VCVG) - Body ground and other terminals Always 10 kΩ or higher Result
Proceed to OK NG
Result:
OK
REPLACE ECM. Refer to REMOVAL [01/2019 - 03/2019]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR