Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001HTMV
Model Year Start: 2020 Model: Corolla Hatchback Prod Date Range: [03/2019 - 03/2023]
Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P212512; Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Battery; 2020 - 2023 MY Corolla Corolla Hatchback [03/2019 - 03/2023]

DTC

P212512

Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Battery

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

P212512

Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Battery

Diagnosis condition:

  • Ignition switch ON

Abnormal condition:

  • Both of the following conditions are met
    • VPA2 is 4.8 V or higher.
    • VPA is between 0.4 V and 3.45 V.

Malfunction time:

  • 2 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
  • Open in EPA2 circuit
  • Short in VPA2 circuit
  • ECM

Comes on

DTC stored
  • SAE Code: P2128
  • DTC for Mexico Models: Applies

MONITOR DESCRIPTION

When the ignition switch is turned ON, the voltage of VPA is between 0.4 V and 3.45 V and the voltage of VPA2 is 4.8 V or more for 2 seconds or more, the ECM determines that the accelerator pedal sensor assembly circuit is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P2128: Accelerator pedal position sensor 2 range check (high voltage)

Required Sensors/Components (Main)

Accelerator pedal sensor assembly

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

2.0 seconds

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

TYPICAL MALFUNCTION THRESHOLDS

VPA2 voltage when VPA voltage 0.4 to 3.45 V

4.8 V or higher

CONFIRMATION DRIVING PATTERN

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+

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 TERMINAL VOLTAGE (ACCELERATOR PEDAL SENSOR ASSEMBLY)

*a

Front view of wire harness connector

(to Accelerator Pedal Sensor 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 accelerator pedal sensor assembly connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A54-3 (VPA2) - Body ground

Ignition switch ON

Below 1 V

HINT:

If the value differs from standard, there may be a short in the power source circuit.

NG

GO TO STEP 4

OK

2.

CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL SENSOR ASSEMBLY - BODY GROUND)

(a) Disconnect the accelerator pedal sensor assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A54-2 (EPA2) - Body ground

Always

Below 1 Ω
OK

REPLACE ACCELERATOR PEDAL(W/SENSOR) ROD ASSEMBLY

NG

3.

CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL SENSOR ASSEMBLY - ECM)

(a) Disconnect the accelerator pedal sensor 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

A54-2 (EPA2) - A47-59 (EPA2)

Always

Below 1 Ω
OK

REPLACE ECM 2020 - 2022 MY Corolla Corolla Hatchback [03/2019 - 09/2022]; M20A-FKS (ENGINE CONTROL): ECM: REMOVAL 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): ECM: REMOVAL 2023 MY Corolla Corolla Hatchback [11/2022 - 03/2023]; M20A-FKS (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL SENSOR ASSEMBLY - ECM)

(a) Disconnect the accelerator pedal sensor 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

A54-3 (VPA2) or A47-58 (VPA2) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE ECM 2020 - 2022 MY Corolla Corolla Hatchback [03/2019 - 09/2022]; M20A-FKS (ENGINE CONTROL): ECM: REMOVAL 2023 MY Corolla Corolla Hatchback [09/2022 - 11/2022]; M20A-FKS (ENGINE CONTROL): ECM: REMOVAL 2023 MY Corolla Corolla Hatchback [11/2022 - 03/2023]; M20A-FKS (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR