Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001HTMT
Model Year Start: 2020 Model: Corolla Hatchback Prod Date Range: [03/2019 - 11/2022]
Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P21201C,P212099; Throttle/Pedal Position Sensor/Switch "D" Circuit Voltage Out of Range; 2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 11/2022]

DTC

P21201C

Throttle/Pedal Position Sensor/Switch "D" Circuit Voltage Out of Range

DTC

P212099

Throttle/Pedal Position Sensor/Switch "D" Exceeded Learning Limit

DESCRIPTION

HINT:

These DTCs relate to the accelerator pedal position sensor.

Refer to DTC P212012.

Click here 2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 03/2023]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P212012; Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Battery+

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P21201C

Throttle/Pedal Position Sensor/Switch "D" Circuit Voltage Out of Range

Diagnosis condition:

  • Ignition switch ON

Abnormal condition:

  • Difference between VPA and VPA2 is greater than or equal to the specified value.

Malfunction time:

  • 0.5 seconds or more

Trip logic:

  • 1 trip detection logic

Detection conditions:

  • Continuous

Sensors/components used for detection:

  • Accelerator pedal sensor assembly
  • Accelerator pedal sensor assembly
  • ECM

Comes on

DTC stored
  • SAE Code: P2121
  • DTC for Mexico Models: Applies

P212099

Throttle/Pedal Position Sensor/Switch "D" Exceeded Learning Limit

Diagnosis condition:

  • Ignition switch ON

Abnormal condition:

  • Difference between VPA and VPA2 is less than 0.4 V, or higher than 1.2 V (learned value of accelerator off position).

Malfunction time:

  • -

Trip logic:

  • 1 trip detection logic

Detection conditions:

  • Continuous

Sensors/components used for detection:

  • Accelerator pedal sensor assembly
  • Accelerator pedal sensor assembly
  • ECM

Comes on

DTC stored
  • SAE Code: P2121
  • DTC for Mexico Models: Applies

MONITOR DESCRIPTION

P21201C

When the ignition switch is turned ON and the difference between VPA and VPA2 is greater than or equal to the specified value for 0.5 seconds or more, the ECM determines that the accelerator pedal sensor assembly circuit is malfunctioning and illuminates the MIL and stores a DTC.

P212099

When the ignition switch is turned ON, the accelerator pedal is fully released and the difference in the calculated voltage of VPA and VPA2 is less than 0.4 V or more than 1.2 V, the ECM determines that the accelerator pedal sensor assembly circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P2121: Accelerator pedal position sensor rationality

Required Sensors/Components (Main)

Accelerator pedal sensor assembly

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

-: P2121 (case 1)

0.5 seconds: P2121 (case 2)

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Accelerator pedal position sensor circuit fail (P2120, P2122, P2123, P2125, P2127, P2128, P2138)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P2121: (Case 1)

Difference between VPA voltage and VPA2 voltage (learned value of accelerator off position)

Less than 0.4 V, or higher than 1.2 V

P2121: (Case 2)

All of the following conditions are met

-

[(VPA voltage - Learned VPA accelerator off position voltage) - (VPA2 voltage - Learned VPA2 accelerator off position voltage)]

0.165 V or higher (varies with accelerator position)

VPA2 voltage

Less than 4.84 V

Either of following conditions is met:

(a) or (b)

(a) VPA voltage - Learned VPA accelerator off position voltage

0.04 V or higher

(b) VPA2 voltage - Learned VPA2 accelerator off position voltage

0.04 V or higher

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 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

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

    Click here 2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON [A].
  7. Turn the Techstream on.
  8. Wait for 5 seconds after turning the ignition switch to ON.
  9. Operate the accelerator pedal in accordance with the following procedure [B].
    1. Enter the following menus: Powertrain / Engine / Data List / Accelerator Position Sensor No.1 Voltage % and Accelerator Position Sensor No.2 Voltage %.
    2. Slowly depress the accelerator pedal until Accelerator Position Sensor No.1 Voltage % is approximately 30% and Accelerator Position Sensor No.2 Voltage % is approximately 46%, then slowly release the accelerator pedal.
  10. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  11. 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.
  12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  13. Proceed to the next screen and enter the DTC to be checked.
  14. 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 [C] again.
    • [A] to [C]: 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 battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

FAIL-SAFE

When these DTCs are stored, the ECM enters fail-safe mode. If either of the 2 sensor circuits malfunctions, the ECM limits the engine output. If both of the circuits malfunction, the ECM regards the accelerator pedal as being released. As a result, the throttle valve is closed and the engine idles.

Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.

WIRING DIAGRAM

Refer to DTC P212012.

Click here 2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 03/2023]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P212012; Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Battery+

CAUTION / NOTICE / HINT

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 ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P21201C OR P212099)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P21201C or P212099 is output

A

DTC P21201C or P212099 and other DTCs are output

B

HINT:

If any DTCs other than P21201C or P212099 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART 2020 MY Corolla Corolla Hatchback [03/2019 - 09/2019]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2020 MY Corolla Corolla Hatchback [09/2019 - 04/2020]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2021 MY Corolla Corolla Hatchback [04/2020 - 06/2020]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2021 MY Corolla Corolla Hatchback [06/2020 - 06/2021]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2022 MY Corolla Corolla Hatchback [06/2021 - 09/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART

A

2.

READ VALUE USING TECHSTREAM (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE AND ACCELERATOR POSITION SENSOR NO. 2 VOLTAGE)

*a

Fully Depressed

*b

Fully Released

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Accelerator Position Sensor No.1 Voltage and Accelerator Position Sensor No.2 Voltage.

Powertrain > Engine > Data List

Tester Display

Accelerator Position Sensor No.1 Voltage

Accelerator Position Sensor No.2 Voltage

(e) Read the value displayed on the Techstream.

Standard Voltage:

Accelerator Pedal Operation

Accelerator Position Sensor No.1 Voltage

Accelerator Position Sensor No.2 Voltage

Difference between Accelerator Position Sensor No.1 Voltage and Accelerator Position Sensor No.2 Voltage

Fully Released

0.5 to 1.1 V

1.2 to 2.0 V

More than 0.02 V

Fully Depressed

2.6 to 4.5 V

3.4 to 4.75 V
OK

CHECK FOR INTERMITTENT PROBLEMS

NG

REPLACE ACCELERATOR PEDAL(W/SENSOR) ROD ASSEMBLY