HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): P212012,...,P21382B; Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Auxiliary Battery; 2021 - 2022 MY Corolla Corolla HV [04/2020

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001N3ZZ
Model Year Start: 2021	Model: Corolla	Prod Date Range: [04/2020 - 09/2022]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with P610): P212012,...,P21382B; Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Auxiliary Battery; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

DTC

P212012

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

DTC

P212014

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

DTC

P21201C

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

DTC

P21201F

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

DTC

P212512

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

DTC

P212514

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

DTC

P21251C

Throttle/Pedal Position Sensor/Switch "E" Voltage Out of Range

DTC

P21251F

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

DTC

P213800

Throttle/Pedal Position Sensor/Switch "D"/" E" Voltage Correlation

DTC

P21382B

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

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU calculates the accelerator pedal opening angle based on the output voltage of the main sensor (VPA) and sub sensor (VPA2) of the accelerator pedal sensor assembly. If the output voltage of either the main sensor (VPA) or sub sensor (VPA2) deviates, a malfunction will be detected.

The cause of this malfunction may be one of the following:

Accelerator pedal sensor assembly malfunction
Wire harness or connector malfunction
Hybrid vehicle control ECU malfunction

DESCRIPTION

The accelerator pedal position sensor is built into the accelerator pedal sensor assembly and detects how much the pedal is depressed. This is a non-contact sensor with Hall elements. There are 2 outputs from the sensor. One is used to detect the accelerator pedal position and the other is used as a confirmation to allow the detection of a malfunction in the sensor itself. Voltage is output from the accelerator pedal position sensor to terminals VPA and VPA2 of the hybrid vehicle control ECU. This voltage varies from 0 to 5 V in accordance with the accelerator pedal position. Terminal VPA2 is primarily used to detect a malfunction in the sensor itself. The hybrid vehicle control ECU determines the current accelerator pedal position and controls the hybrid control system based on signals received by terminals VPA and VPA2.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate
P212012	Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Auxiliary Battery	Short to +B in the main sensor circuit: The main sensor voltage is 4.8 V or more for 2 seconds. (1 trip detection logic)	Wire harness or connector Accelerator pedal sensor assembly Hybrid vehicle control ECU	Comes on	Master Warning: Comes on
P212014	Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Ground or Open	Open or short to ground in the main sensor circuit: The main sensor voltage is 0.4 V or less for 0.5 seconds. (1 trip detection logic)	Wire harness or connector Accelerator pedal sensor assembly Hybrid vehicle control ECU	Comes on	Master Warning: Comes on
P21201C	Throttle/Pedal Position Sensor/Switch "D" Voltage Out of Range	Internal malfunction in the main sensor: Main sensor output changes rapidly (detected when there are no circuit malfunctions such as an open or short). (1 trip detection logic)	Wire harness or connector Accelerator pedal sensor assembly Hybrid vehicle control ECU	Comes on	Master Warning: Comes on
P21201F	Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent	Main sensor circuit wiring malfunction or level is not stable: Main sensor voltage is 0.4 V or less or 4.8 V or more for a certain period of time. (Both of the following conditions are met: The main sensor voltage is 0.4 V or less for a certain period of time and 4.8 V or more for a certain period of time.) (1 trip detection logic)	Wire harness or connector Accelerator pedal sensor assembly Hybrid vehicle control ECU	Comes on	Master Warning: Comes on
P212512	Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Auxiliary Battery	Short to +B in the sub sensor circuit: Main sensor is normal and sub sensor voltage is 4.8 V or more for 2 seconds. (1 trip detection logic)	Wire harness or connector Accelerator pedal sensor assembly Hybrid vehicle control ECU	Comes on	Master Warning: Comes on
P212514	Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Ground or Open	Open or short to ground in the sub sensor circuit: The sub sensor voltage is 1.2 V or less for 0.5 seconds. (1 trip detection logic)	Wire harness or connector Accelerator pedal sensor assembly Hybrid vehicle control ECU	Comes on	Master Warning: Comes on
P21251C	Throttle/Pedal Position Sensor/Switch "E" Voltage Out of Range	Internal malfunction of the sub sensor: Sub sensor output changes rapidly (detected when there are no circuit malfunctions such as an open or short). (1 trip detection logic)	Wire harness or connector Accelerator pedal sensor assembly Hybrid vehicle control ECU	Comes on	Master Warning: Comes on
P21251F	Throttle/Pedal Position Sensor/Switch "E" Circuit Intermittent	Sub sensor circuit wiring malfunction or level is not stable: When the main sensor circuit is normal, the sub sensor voltage is 1.2 V or less or 4.8 V or more for a certain period of time. (Both of the following conditions are met: Sub sensor voltage is 1.2 V or less for a certain period of time, and the main sensor is normal and sub sensor voltage is 4.8 V or more for a certain period of time.) (1 trip detection logic)	Wire harness or connector Accelerator pedal sensor assembly Hybrid vehicle control ECU	Comes on	Master Warning: Comes on
P213800	Throttle/Pedal Position Sensor/Switch "D"/" E" Voltage Correlation	Difference between the main sensor value and sub sensor value is large. (1 trip detection logic)	Wire harness or connector Accelerator pedal sensor assembly Hybrid vehicle control ECU	Comes on	Master Warning: Comes on
P21382B	Throttle/Pedal Position Sensor/Switch "D"/"E" Signal Cross Coupled	Main or sub sensor circuit wiring malfunction: The difference in voltage between the main sensor and sub sensor is 0.02 V or less, or a low output malfunction continues in both the main and sub sensors for a certain period of time. (1 trip detection logic)	Wire harness or connector Accelerator pedal sensor assembly Hybrid vehicle control ECU	Comes on	Master Warning: Comes on

Related Data List

DTC No.	Data List
P212012	Accelerator Position Sensor No. 1 Voltage % Accelerator Position Sensor No. 2 Voltage %
P212014
P21201C
P21201F
P212512
P212514
P21251C
P21251F
P213800
P21382B

MONITOR DESCRIPTION

The hybrid vehicle control ECU calculates the differences of the voltage of main accelerator sensor and sub accelerator sensor. If the differences exceed prescribed values, the hybrid vehicle control ECU determines that there is a malfunction in the accelerator sensor circuit. If the hybrid vehicle control ECU detects this malfunction, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P2123 (INF P212012): Accelerator Pedal Position Sensor (APP Sensor) Sensor 1 Range Check (High voltage) P2122 (INF P212014): Accelerator Pedal Position Sensor (APP Sensor) Sensor 1 Range Check (Low voltage) P2121 (INF P21201C): Throttle/Pedal Position Sensor/Switch "D" Voltage Out of Range P2120 (INF P21201F): Accelerator Pedal Position Sensor (APP Sensor) Sensor 1 Range Check (Chattering) P2128 (INF P212512): Accelerator Pedal Position Sensor (APP Sensor) Sensor 2 Range Check (High voltage) P2127 (INF P212514): Accelerator Pedal Position Sensor (APP Sensor) Sensor 2 Range Check (Low voltage) P2126 (INF P21251C): Throttle/Pedal Position Sensor/Switch "E" Voltage Out of Range P2125 (INF P21251F): Accelerator Pedal Position Sensor (APP Sensor) Sensor 2 Range Check (Chattering) P2138 (INF P213800): Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation P2138 (INF P21382B): Accelerator Pedal Position Sensor (APP Sensor) Correlation
Required sensors/components	Throttle/Pedal Position Sensor/Switch
Frequency of operation	Continuous
Duration	TMC's intellectual property
MIL operation	Immediately / 1 driving cycle
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present	TMC's intellectual property
Other conditions belong to TMC's intellectual property	-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

COMPONENT OPERATING RANGE

Hybrid vehicle control ECU

DTC P2123 (INF P212012) is not detected

DTC P2122 (INF P212014) is not detected

DTC P2121 (INF P21201C) is not detected

DTC P2120 (INF P21201F) is not detected

DTC P2128 (INF P212512) is not detected

DTC P2127 (INF P212514) is not detected

DTC P2126 (INF P21251C) is not detected

DTC P2125 (INF P21251F) is not detected

DTC P2138 (INF P213800) is not detected

DTC P2138 (INF P21382B) is not detected

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

Connect the Techstream to the DLC3.
Turn the power switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for 2 minutes or more.
Turn the power switch on (IG) and turn the Techstream on.
Wait for approximately 10 seconds with the power switch on (READY) and shift lever in P, then fully depress and release the accelerator pedal several times.[*1]
HINT:

[*1] : Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

PROCEDURE

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

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Data List / Accelerator Position Sensor No. 1 Voltage %, Accelerator Position Sensor No. 2 Voltage %.

Powertrain > Hybrid Control > Data List

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

(d) Read the Data List.

Standard:

Tester Display	Accelerator Pedal Condition	Specified Condition
Accelerator Position Sensor No. 1 Voltage %	Not depressed	10 to 22%
	Fully depressed	52 to 90%
	Not depressed → Fully depressed → Not depressed (Accelerator pedal should be operated slowly)	Value changes progressively
Accelerator Position Sensor No. 2 Voltage %	Not depressed	24 to 40%
	Fully depressed	68 to 99%
	Not depressed → Fully depressed → Not depressed (Accelerator pedal should be operated slowly)	Value changes progressively

(e) Turn the power switch off.

CHECK FOR INTERMITTENT PROBLEMS

2.	CHECK CONNECTOR CONNECTION CONDITION (ACCELERATOR PEDAL SENSOR ASSEMBLY CONNECTOR)

(a) Check the connector connections and contact pressure of the relevant terminals for the accelerator pedal sensor assembly connector.

Click here

OK:

The connectors are connected securely and there are no contact pressure problems.

CONNECT SECURELY

3.	CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here

CONNECT SECURELY

4.	CHECK HYBRID VEHICLE CONTROL ECU (CHECK VOLTAGE)

(a) Disconnect the A54 accelerator pedal sensor assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A54-4 (VCPA) - A54-5 (EPA)	Power switch on (IG)	4.5 to 5.5 V
A54-1 (VCP2) - A54-2 (EPA2)	Power switch on (IG)	4.5 to 5.5 V

*a	Front view of wire harness connector (to Accelerator Pedal Sensor Assembly)

(d) Turn the power switch off.

(e) Reconnect the A54 accelerator pedal sensor assembly connector.

GO TO STEP 6

5.	CHECK HYBRID VEHICLE CONTROL ECU (CHECK RESISTANCE)

(a) Disconnect the A54 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
A54-6 (VPA) - A54-5 (EPA)	Power switch off	28.00 to 41.61 kΩ
A54-3 (VPA2) - A54-2 (EPA2)	Power switch off	28.00 to 41.61 kΩ

*a	Front view of wire harness connector (to Accelerator Pedal Sensor Assembly)

REPLACE ACCELERATOR PEDAL(W/SENSOR) ROD ASSEMBLY

GO TO STEP 7

6.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - ACCELERATOR PEDAL SENSOR ASSEMBLY)

(a) Disconnect the A57 hybrid vehicle control ECU connector.

(b) Disconnect the A54 accelerator pedal sensor assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A57-24 (VCPA) - Body ground	Power switch on (IG)	Below 1 V
A57-37 (EPA) - Body ground	Power switch on (IG)	Below 1 V
A57-26 (VCP2) - Body ground	Power switch on (IG)	Below 1 V
A57-25 (EPA2) - Body ground	Power switch on (IG)	Below 1 V

NOTICE:

Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Front view of wire harness connector

(to Hybrid Vehicle Control ECU)

Front view of wire harness connector

(to Accelerator Pedal Sensor Assembly)

(e) Turn the power switch off.

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

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
A57-24 (VCPA) - A54-4 (VCPA)	Power switch off	Below 1 Ω
A57-37 (EPA) - A54-5 (EPA)	Power switch off	Below 1 Ω
A57-26 (VCP2) - A54-1 (VCP2)	Power switch off	Below 1 Ω
A57-25 (EPA2) - A54-2 (EPA2)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
A57-24 (VCPA) or A54-4 (VCPA) - Body ground and other terminals	Power switch off	10 kΩ or higher
A57-37 (EPA) or A54-5 (EPA) - Body ground and other terminals	Power switch off	10 kΩ or higher
A57-26 (VCP2) or A54-1 (VCP2) - Body ground and other terminals	Power switch off	10 kΩ or higher
A57-25 (EPA2) or A54-2 (EPA2) - Body ground and other terminals	Power switch off	10 kΩ or higher

(g) Reconnect the A54 accelerator pedal sensor assembly connector.

(h) Reconnect the A57 hybrid vehicle control ECU connector.

REPLACE HYBRID VEHICLE CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - ACCELERATOR PEDAL SENSOR ASSEMBLY)

(a) Disconnect the A57 hybrid vehicle control ECU connector.

(b) Disconnect the A54 accelerator pedal sensor assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A57-36 (VPA) - Body ground	Power switch on (IG)	Below 1 V
A57-37 (EPA) - Body ground	Power switch on (IG)	Below 1 V
A57-38 (VPA2) - Body ground	Power switch on (IG)	Below 1 V
A57-25 (EPA2) - Body ground	Power switch on (IG)	Below 1 V

NOTICE:

Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

Front view of wire harness connector

(to Hybrid Vehicle Control ECU)

Front view of wire harness connector

(to Accelerator Pedal Sensor Assembly)

(e) Turn the power switch off.

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

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
A57-36 (VPA) - A54-6 (VPA)	Power switch off	Below 1 Ω
A57-37 (EPA) - A54-5 (EPA)	Power switch off	Below 1 Ω
A57-38 (VPA2) - A54-3 (VPA2)	Power switch off	Below 1 Ω
A57-25 (EPA2) - A54-2 (EPA2)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
A57-36 (VPA) or A54-6 (VPA) - Body ground and other terminals	Power switch off	10 kΩ or higher
A57-37 (EPA) or A54-5 (EPA) - Body ground and other terminals	Power switch off	10 kΩ or higher
A57-38 (VPA2) or A54-3 (VPA2) - Body ground and other terminals	Power switch off	10 kΩ or higher
A57-25 (EPA2) or A54-2 (EPA2) - Body ground and other terminals	Power switch off	10 kΩ or higher

(g) Reconnect the A54 accelerator pedal sensor assembly connector.

(h) Reconnect the A57 hybrid vehicle control ECU connector.

REPLACE HYBRID VEHICLE CONTROL ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR