Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GJ5F
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 04/2020]
Title: 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P010014,P010016; Mass or Volume Air Flow Sensor "A" Circuit Short to Ground or Open; 2020 MY Corolla Corolla HV [01/2019 - 04/2020]

DTC

P010014

Mass or Volume Air Flow Sensor "A" Circuit Short to Ground or Open

DTC

P010016

Mass or Volume Air Flow Sensor "A" Circuit Voltage Below Threshold

DESCRIPTION

Refer to DTC P010012.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P010012,P010017; Mass or Volume Air Flow Sensor "A" Circuit Short to Battery+

HINT:

When any of these DTCs are stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is calculated by the ECM, according to the engine speed and throttle valve position. Fail-safe mode continues until a pass condition is detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P010014

Mass or Volume Air Flow Sensor "A" Circuit Short to Ground or Open

Both of the following conditions are met for 3 seconds or more: (1 trip detection logic)

  • The mass air flow meter sub-assembly voltage is less than 0.2 V.
  • The engine speed is less than 4000 rpm.
  • Open or short in mass air flow meter sub-assembly circuit
  • Mass air flow meter sub-assembly
  • ECM

Comes on

DTC stored

  • SAE Code: P0102
  • DTC for Mexico Models: Applies

P010016

Mass or Volume Air Flow Sensor "A" Circuit Voltage Below Threshold

Both of the following conditions are met for 3 seconds or more: (2 trip detection logic)

  • The mass air flow meter sub-assembly voltage is less than 0.2 V.
  • The engine speed is 4000 rpm or higher.
  • Open or short in mass air flow meter sub-assembly circuit
  • Mass air flow meter sub-assembly
  • ECM

Comes on

DTC stored

  • SAE Code: P0102
  • DTC for Mexico Models: Does not apply

HINT:

When these DTCs are output, check the mass air flow rate in the Data List. Enter the following menus: Powertrain / Engine / Data List / Mass Air Flow Sensor.

DTC No.

Mass Air Flow Sensor

Malfunction

P010014

P010016

0 gm/sec

  • Open in mass air flow meter sub-assembly power source circuit
  • Open in VG circuit
  • Short to ground in VG circuit

If the Data List value is normal it may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

MONITOR DESCRIPTION

If the mass air flow meter sub-assembly is malfunctioning or there is an open or short in the mass air flow meter sub-assembly circuit, the voltage will deviate from the normal operating range. The ECM interprets this deviation as a malfunction in the mass air flow meter sub-assembly circuit, illuminate the MIL and stores a DTC.

Example:

When the sensor output voltage remains less than 0.2 V for 3 seconds or more, the ECM stores a DTC.

MONITOR STRATEGY

Related DTCs

P0102: Mass air flow meter range check (low voltage)

Required Sensors/Components (Main)

Mass air flow meter sub-assembly

Required Sensors/Components (Related)

Crankshaft position sensor

Frequency of Operation

Continuous

Duration

3 seconds

MIL Operation

Immediate: Case 1

2 driving cycles: Case 2

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

None

Case 1

All of the following conditions are met

-

Engine speed

Less than 4000 rpm

Auxiliary battery voltage

8 V or higher

Power switch

On (IG)

Case 2

All of the following conditions are met

-

Engine speed

4000 rpm or higher

Auxiliary battery voltage

8 V or higher

Power switch

On (IG)

TYPICAL MALFUNCTION THRESHOLDS

Mass air flow meter voltage

Less than 0.2 V

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off and wait for at least 30 seconds.
  6. Turn the power switch on (IG) [A].
  7. Turn the Techstream on.
  8. Put the engine in Inspection Mode (Maintenance Mode).

    Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

  9. Start the engine.
  10. Idle the engine for 5 seconds [B].
  11. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  12. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  13. With the engine running, during normal driving, increase the vehicle speed to 80 km/h (50 mph) [D].

    CAUTION:

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

    HINT:

    If the engine stops, further depress the accelerator pedal to restart the engine.

  14. With the engine running, depress the accelerator pedal fully to increase the vehicle speed to between 100 and 120 km/h (62 and 75 mph) (engine speed of 4000 rpm or more) and maintain the speed for at least 5 seconds [E].

    CAUTION:

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

    HINT:

    If the engine stops, further depress the accelerator pedal to restart the engine.

  15. Enter the following menus: Powertrain / Engine / Trouble Codes [F].
  16. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  17. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  18. Input the DTC: P010014 or P010016.
  19. 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • If the judgment result is INCOMPLETE, perform steps [B] through [F] again.
    • [A] to [F]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

Refer to DTC P010012.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P010012,P010017; Mass or Volume Air Flow Sensor "A" Circuit Short to Battery+

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY

    (Select Powertrain in Health Check and then check the time stamp data.)

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY

HINT:

Read freeze frame data using the Techstream. 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 TERMINAL VOLTAGE (POWER SOURCE OF MASS AIR FLOW METER SUB-ASSEMBLY)

*a

Front view of wire harness connector

(to Mass Air Flow Meter Sub-assembly)

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Turn the power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

C25-1 (+B) - Body ground

Power switch on (IG)

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - MASS AIR FLOW METER SUB-ASSEMBLY)

OK

2.

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

(a) Disconnect the mass air flow meter sub-assembly connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C25-3 (VG) - C77-137 (VG)

Always

Below 1 Ω

C25-3 (VG) or C77-137 (VG) - Body ground and other terminals

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (RESISTANCE OF ECM)

(a) Disconnect the mass air flow meter sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C25-3 (VG) - C25-2 (E2G)

Power switch off

190 to 210 kΩ

HINT:

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

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; 2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

OK

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

NG

REPLACE ECM