Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001R2GX
Model Year Start: 2021 Model: Avalon Prod Date Range: [08/2020 -           ]
Title: A25A-FKS (ENGINE CONTROL): SFI SYSTEM: P212012,P212014,P21201C,P21201F,P212099,P212512,P212514,P21251F,P21382B; Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Battery; 2021 - 2022 MY Avalon [08/2020 -        ]

DTC

P212012

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

DTC

P212014

Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Ground or Open

DTC

P21201C

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

DTC

P21201F

Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent

DTC

P212099

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

DTC

P212512

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

DTC

P212514

Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Ground or Open

DTC

P21251F

Throttle/Pedal Position Sensor/Switch "E" Circuit Intermittent

DTC

P21382B

Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation Signal Cross Coupled

DESCRIPTION

HINT:

These DTCs relate to the accelerator pedal position sensor.

The accelerator pedal position sensor is built into the accelerator pedal sensor assembly and has 2 sensor circuits: VPA (main) and VPA2 (sub). This sensor is a non-contact type sensor and uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds. The voltage, which is applied to terminals VPA and VPA2 of the ECM, varies between 0.5 V and 4.75 V in proportion to the operating angle of the accelerator pedal (throttle valve). A signal from VPA indicates the actual accelerator pedal opening angle (throttle valve opening angle) and is used for engine control. A signal from VPA2 conveys the status of the VPA circuit and is used to check the accelerator pedal position sensor itself.

The ECM monitors the actual accelerator pedal opening angle (throttle valve opening angle) through the signals from VPA and VPA2, and controls the throttle actuator according to these signals.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P212012

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

VPA is 4.8 V or higher for 2 seconds or more (1 trip detection logic).
  • Accelerator pedal sensor assembly
  • Open in EPA circuit
  • Short in VPA circuit
  • ECM

Comes on

DTC stored

SAE Code: P2123

P212014

Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Ground or Open

VPA is 0.4 V or less for 0.5 seconds or more when the accelerator pedal is depressed (1 trip detection logic).
  • Accelerator pedal sensor assembly
  • Open in VCPA circuit
  • Open or ground short in VPA circuit
  • ECM

Comes on

DTC stored

SAE Code: P2122

P21201C

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

Difference between VPA and VPA2 is greater than or equal to the specified value for 0.5 seconds (1 trip detection logic).
  • Accelerator pedal sensor assembly
  • ECM

Comes on

DTC stored

SAE Code: P2121

P21201F

Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent

VPA fluctuates rapidly beyond the upper and lower malfunction thresholds for 0.5 seconds or more (1 trip detection logic).
  • Accelerator pedal sensor assembly
  • Accelerator pedal sensor assembly circuit
  • ECM

Comes on

DTC stored

SAE Code: P2120

P212099

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

Difference between VPA and VPA2 is less than 0.4 V, or higher than 1.2 V (learned value of accelerator off position) (1 trip detection logic).
  • Accelerator pedal sensor assembly
  • ECM

Comes on

DTC stored

SAE Code: P2121

P212512

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

Both of the following conditions are met for 2 seconds or more (1 trip detection logic):

(a) VPA2 is 4.8 V or higher.

(b) VPA is between 0.4 V and 3.45 V.
  • Accelerator pedal sensor assembly
  • Open in EPA2 circuit
  • Short in VPA2 circuit
  • ECM

Comes on

DTC stored

SAE Code: P2128

P212514

Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Ground or Open

VPA2 is 1.2 V or less for 0.5 seconds or more when the accelerator pedal is depressed (1 trip detection logic).
  • Accelerator pedal sensor assembly
  • Open in VCP2 circuit
  • Open or ground short in VPA2 circuit
  • ECM

Comes on

DTC stored

SAE Code: P2127

P21251F

Throttle/Pedal Position Sensor/Switch "E" Circuit Intermittent

VPA2 fluctuates rapidly beyond the upper and lower malfunction thresholds for 0.5 seconds or more (1 trip detection logic).
  • Accelerator pedal sensor assembly
  • Accelerator pedal sensor assembly circuit
  • ECM

Comes on

DTC stored

SAE Code: P2125

P21382B

Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation Signal Cross Coupled

Difference between VPA and VPA2 is 0.02 V or less for 2.0 seconds or more (1 trip detection logic):
  • Accelerator pedal sensor assembly
  • Short between VPA and VPA2 circuits
  • ECM

Comes on

DTC stored

SAE Code: P2138

HINT:

When any of these DTCs are output, check the accelerator pedal position sensor voltage using the Techstream. Enter the following menus: Powertrain / Engine / Data List / Accelerator Position Sensor No.1 Voltage and Accelerator Position Sensor No.2 Voltage.

Trouble Area

Accelerator Pedal Fully Released

Accelerator Pedal Fully Depressed

Accelerator Position Sensor No.1 Voltage

Accelerator Position Sensor No.2 Voltage

Accelerator Position Sensor No.1 Voltage

Accelerator Position Sensor No.2 Voltage

Open in VC circuit

0 to 0.2 V

0 to 0.2 V

0 to 0.2 V

0 to 0.2 V

Open or ground short in VPA circuit

0 to 0.2 V

1.2 to 2.0 V

0 to 0.2 V

3.4 to 4.75 V

Open or ground short in VPA2 circuit

0.5 to 1.1 V

0 to 0.2 V

2.6 to 4.5 V

0 to 0.2 V

Open in EPA circuit

4.5 to 4.98 V

4.5 to 4.98 V

4.5 to 4.98 V

4.5 to 4.98 V

Normal condition

0.5 to 1.1 V

1.2 to 2.0 V

2.6 to 4.5 V

3.4 to 4.75 V

HINT:

Accelerator pedal positions are expressed as voltages.

MONITOR DESCRIPTION

When either output voltage of VPA or VPA2 deviates from the standard range, or the difference between the output voltages of the 2 sensor circuits exceeds the upper or lower threshold, the ECM determines that there is a malfunction in the accelerator pedal position sensor. The ECM then illuminates the MIL and stores a DTC.

Example:

When the output voltage of VPA is 0.4 V or less for 0.5 seconds or more when the accelerator pedal is fully depressed, DTC P212014 is stored.

MONITOR STRATEGY

Related DTCs

P2120: Accelerator pedal position sensor 1 range check (chattering)

P2121: Accelerator pedal position sensor rationality

P2122: Accelerator pedal position sensor 1 range check (low voltage)

P2123: Accelerator pedal position sensor 1 range check (high voltage)

P2125: Accelerator pedal position sensor 2 range check (chattering)

P2127: Accelerator pedal position sensor 2 range check (low voltage)

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

P2138: Accelerator pedal position sensor range check (correlation)

Required Sensors/Components (Main)

Accelerator pedal sensor assembly

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

-: P2121 (case 1)

0.5 seconds: P2120, P2121 (case 2), P2122, P2125 and P2127

2.0 seconds: P2123, P2128 and P2138

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

P2120, P2122, P2123, P2125, P2127, P2128 and P2138

Monitor runs whenever the following DTCs are not stored

None

P2121

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

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P2120

Either of the following conditions is met

1 or 2

1. VPA voltage

0.4 V or less

2. VPA voltage

4.8 V or higher

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

P2122

VPA voltage

0.4 V or less

P2123

VPA voltage

4.8 V or higher

P2125

Either of the following conditions is met

1 or 2

1. VPA2 voltage

1.2 V or less

2. VPA2 voltage when VPA voltage 0.4 to 3.45 V

4.8 V or higher

P2127

VPA2 voltage

1.2 V or less

P2128

VPA2 voltage when VPA voltage 0.4 to 3.45 V

4.8 V or higher

P2138

Difference between VPA and VPA2 voltages

0.02 V or less

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 2021 - 2022 MY Avalon [08/2020 -        ]; A25A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

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

    Click here 2021 - 2022 MY Avalon [08/2020 -        ]; A25A-FKS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

P212012, P212014, P21201F, P212512, P212514, P21251F and P21382B

  1. Connect the Techstream to the DLC3.
  2. Turn the engine 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 engine switch off and wait for at least 30 seconds.
  6. Turn the engine switch on (IG) [A].
  7. Turn the Techstream on.
  8. Fully depress and release the accelerator pedal [B].
  9. Check that 5 seconds or more have elapsed since the engine switch is on (IG).
  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. Input the DTC: P212012, P212014, P21201F, P212512, P212514, P21251F or P21382B.
  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.

P21201C and P212099

  1. Connect the Techstream to the DLC3.
  2. Turn the engine 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 engine switch off and wait for at least 30 seconds.
  6. Turn the engine switch on (IG) [A].
  7. Turn the Techstream on.
  8. Wait for 5 seconds after turning the engine switch is on (IG).
  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. Input the DTC: P21201C or P212099.
  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. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 7.5° throttle valve opening angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

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

WIRING DIAGRAM

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.

READ VALUE USING TECHSTREAM (ACCELERATOR PEDAL POSITION SENSOR)

*a

Fully Depressed

*b

Fully Released

(a) Connect the Techstream to the DLC3.

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

(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

2.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF 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 engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A17-4 (VCPA) - A17-5 (EPA)

Engine switch on (IG)

4.5 to 5.5 V

A17-1 (VCP2) - A17-2 (EPA2)

Engine switch on (IG)

4.5 to 5.5 V
NG

GO TO STEP 5

OK

3.

CHECK HARNESS AND CONNECTOR (RESISTANCE OF ECM)

*a

Front view of wire harness connector

(to Accelerator Pedal Sensor Assembly)

(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

A17-6 (VPA) - A17-5 (EPA)

Engine switch off

37.05 to 40.95 kΩ

A17-3 (VPA2) - A17-2 (EPA2)

Engine switch off

37.05 to 40.95 kΩ
OK

REPLACE ACCELERATOR PEDAL(W/SENSOR) ROD ASSEMBLY

NG

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

A17-6 (VPA) - A64-55 (VPA)

Always

Below 1 Ω

A17-5 (EPA) - A64-56 (EPA)

Always

Below 1 Ω

A17-3 (VPA2) - A64-58 (VPA2)

Always

Below 1 Ω

A17-2 (EPA2) - A64-59 (EPA2)

Always

Below 1 Ω

A17-6 (VPA) or A64-55 (VPA) - Body ground and other terminals

Always

10 kΩ or higher

A17-5 (EPA) or A64-56 (EPA) - Body ground and other terminals

Always

10 kΩ or higher

A17-3 (VPA2) or A64-58 (VPA2) - Body ground and other terminals

Always

10 kΩ or higher

A17-2 (EPA2) or A64-59 (EPA2) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

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

A17-4 (VCPA) - A64-57 (VCPA)

Always

Below 1 Ω

A17-5 (EPA) - A64-56 (EPA)

Always

Below 1 Ω

A17-1 (VCP2) - A64-60 (VCP2)

Always

Below 1 Ω

A17-2 (EPA2) - A64-59 (EPA2)

Always

Below 1 Ω

A17-4 (VCPA) or A64-57 (VCPA) - Body ground and other terminals

Always

10 kΩ or higher

A17-5 (EPA) or A64-56 (EPA) - Body ground and other terminals

Always

10 kΩ or higher

A17-1 (VCP2) or A64-60 (VCP2) - Body ground and other terminals

Always

10 kΩ or higher

A17-2 (EPA2) or A64-59 (EPA2) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR