Toyota Corolla Cross: Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent (P21201F,P21251F)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / M20a-fks (engine Control) / Sfi System / Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent (P21201F,P21251F)

DESCRIPTION

HINT:

These DTCs relate to the accelerator pedal position sensor.

Refer to DTC P212012.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Note
P21201F	Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent	Diagnosis condition: Ignition switch ON Abnormal condition: VPA fluctuates rapidly beyond the upper and lower malfunction thresholds. 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 Accelerator pedal sensor assembly circuit ECM	Comes on	SAE Code: P2120 DTC for Mexico Models: Applies
P21251F	Throttle/Pedal Position Sensor/Switch "E" Circuit Intermittent	Diagnosis condition: Ignition switch ON Abnormal condition: VPA2 fluctuates rapidly beyond the upper and lower malfunction thresholds. 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 Accelerator pedal sensor assembly circuit ECM	Comes on	SAE Code: P2125 DTC for Mexico Models: Applies

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P21201F

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

Diagnosis condition:

Ignition switch ON

Abnormal condition:

VPA fluctuates rapidly beyond the upper and lower malfunction thresholds.

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
Accelerator pedal sensor assembly circuit
ECM

Comes on

SAE Code: P2120
DTC for Mexico Models: Applies

P21251F

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

Diagnosis condition:

Ignition switch ON

Abnormal condition:

VPA2 fluctuates rapidly beyond the upper and lower malfunction thresholds.

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
Accelerator pedal sensor assembly circuit
ECM

Comes on

SAE Code: P2125
DTC for Mexico Models: Applies

MONITOR DESCRIPTION

P21201F

When the ignition switch is turned ON and the voltage of VPA is 0.4 V or less, or 4.8 V or higher 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.

P21251F

When the ignition switch is turned ON and the voltage of VPA2 fluctuates rapidly beyond the upper and lower malfunction thresholds 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.

MONITOR STRATEGY

Related DTCs	P2120: Accelerator pedal position sensor 1 range check (chattering) P2125: Accelerator pedal position sensor 2 range check (chattering)
Required Sensors/Components (Main)	Accelerator pedal sensor assembly
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	0.5 seconds
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

TYPICAL MALFUNCTION THRESHOLDS

P2120

VPA voltage

0.4 V or less, or 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

CONFIRMATION DRIVING PATTERN

Refer to DTC P212012.

Click here

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

CAUTION / NOTICE / HINT

HINT:

Read Freeze Frame Data using the GTS. 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 DTC OUTPUT

(a) Check and record any DTCs and freeze frame data.

Powertrain > Engine > Trouble Codes

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(b) Turn the ignition switch off and wait for at least 30 seconds.

3.	CHECK WHETHER DTC OUTPUT RECURS (DTC P212012, P212014, P212512 OR P212514)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result	Proceed to
DTC P212012, P212014, P212512 or P212514 is output	A
DTCs are not output	B

GO TO DTC CHART

4.	READ FREEZE FRAME DATA (ACCELERATOR POSITION SENSOR NO. 1 VOLTAGE AND ACCELERATOR POSITION SENSOR NO. 2 VOLTAGE)

(a) Using the GTS, confirm the vehicle conditions recorded in the Freeze Frame Data which were present when the DTC was stored.

Click here

Freeze Frame Data Item	Result	Suspected Trouble Area	Proceed to
Accelerator Position Sensor No.1 Voltage	0.4 V or less	Accelerator pedal sensor assembly Wire harness or connector	A
Accelerator Position Sensor No.2 Voltage	1.2 V or less		A
Accelerator Position Sensor No.1 Voltage	4.8 V or higher	Wire harness or connector ECM	B
Accelerator Position Sensor No.2 Voltage	4.8 V or higher	Wire harness or connector ECM	B

GO TO STEP 7

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

*a	Fully Depressed
*b	Fully Released

(a) Enter the following menus.

Powertrain > Engine > Data List

Tester Display
Accelerator Position Sensor No.1 Voltage
Accelerator Position Sensor No.2 Voltage

(b) Fully depress and release the accelerator pedal quickly and repeatedly and confirm that the data monitor value changes in accordance with the operation of the accelerator pedal.

Standard Voltage:

Accelerator Pedal Operation	Accelerator Position Sensor No.1 Voltage	Accelerator Position Sensor No.2 Voltage
Fully Released	0.5 to 1.1 V	1.2 to 2.0 V
Fully Depressed	2.6 to 4.5 V	3.4 to 4.75 V

Result	Proceed to
The data monitor value changes in accordance with the operation of the accelerator pedal	A
The data monitor value does not change in accordance with the operation of the accelerator pedal	B

GO TO STEP 7

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

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) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A54-6 (VPA) - A47-55 (VPA)	Always	Below 1 Ω
A54-5 (EPA) - A47-56 (EPA)	Always	Below 1 Ω
A54-4 (VCPA) - A47-57 (VCPA)	Always	Below 1 Ω
A54-3 (VPA2) - A47-58 (VPA2)	Always	Below 1 Ω
A54-2 (EPA2) - A47-59 (EPA2)	Always	Below 1 Ω
A54-1 (VCP2) - A47-60 (VCP2)	Always	Below 1 Ω
A54-6 (VPA) or A47-55 (VPA) - Body ground and other terminals	Always	10 kΩ or higher
A54-5 (EPA) or A47-56 (EPA) - Body ground and other terminals	Always	10 kΩ or higher
A54-4 (VCPA) or A47-57 (VCPA) - Body ground and other terminals	Always	10 kΩ or higher
A54-3 (VPA2) or A47-58 (VPA2) - Body ground and other terminals	Always	10 kΩ or higher
A54-2 (EPA2) or A47-59 (EPA2) - Body ground and other terminals	Always	10 kΩ or higher
A54-1 (VCP2) or A47-60 (VCP2) - Body ground and other terminals	Always	10 kΩ or higher

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Enter the following menus.

Powertrain > Engine > Data List

Tester Display
Accelerator Position Sensor No.1 Voltage
Accelerator Position Sensor No.2 Voltage

(b) While jiggling the ECM connector, confirm that the data monitor value changes.

Standard Voltage:

Accelerator Pedal Operation	Accelerator Position Sensor No.1 Voltage	Accelerator Position Sensor No.2 Voltage
Fully Released	0.5 to 1.1 V	1.2 to 2.0 V
Fully Depressed	2.6 to 4.5 V	3.4 to 4.75 V

Result	Proceed to
The data monitor value does not change	A
The data monitor value changes	B

CHECK FOR INTERMITTENT PROBLEMS

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

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) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A54-6 (VPA) - A47-55 (VPA)	Always	Below 1 Ω
A54-5 (EPA) - A47-56 (EPA)	Always	Below 1 Ω
A54-4 (VCPA) - A47-57 (VCPA)	Always	Below 1 Ω
A54-3 (VPA2) - A47-58 (VPA2)	Always	Below 1 Ω
A54-2 (EPA2) - A47-59 (EPA2)	Always	Below 1 Ω
A54-1 (VCP2) - A47-60 (VCP2)	Always	Below 1 Ω
A54-6 (VPA) or A47-55 (VPA) - Body ground and other terminals	Always	10 kΩ or higher
A54-5 (EPA) or A47-56 (EPA) - Body ground and other terminals	Always	10 kΩ or higher
A54-4 (VCPA) or A47-57 (VCPA) - Body ground and other terminals	Always	10 kΩ or higher
A54-3 (VPA2) or A47-58 (VPA2) - Body ground and other terminals	Always	10 kΩ or higher
A54-2 (EPA2) or A47-59 (EPA2) - Body ground and other terminals	Always	10 kΩ or higher
A54-1 (VCP2) or A47-60 (VCP2) - Body ground and other terminals	Always	10 kΩ or higher

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

SEE MORE:

Installation

INSTALLATION CAUTION / NOTICE / HINT COMPONENTS (INSTALLATION) Procedure Part Name Code 1 NO. 2 EXHAUST MANIFOLD HEAT INSULATOR 17168 - - - 2 EXHAUST MANIFOLD (TWC: Front Catalyst) 17141 - - 3 MANIFOLD

Zero Point Calibration of Yaw Rate Sensor Undone (X204C)

DESCRIPTION The airbag ECU assembly has a built-in yaw rate and acceleration sensor. Code Tester Display Measurement Item Trouble Area Output ECU X204C Zero Point Calibration of Yaw Rate Sensor Undone H

Toyota Corolla Cross: Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent (P21201F,P21251F)

READ NEXT:

Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Battery (P212512)

Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Ground or Open (P212514)

Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled (P21352B)

SEE MORE:

Installation

Zero Point Calibration of Yaw Rate Sensor Undone (X204C)