P2120-152, P2121-106, P2122-104, P2123-105, P2125-153, P2126-109, P2127-107, P2128-108, P2138-110, P2138-154

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DTC Code	DTC Name
P2120-152	Throttle / Pedal Position Sensor / Switch "D" Circuit
P2121-106	Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance
P2122-104	Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input
P2123-105	Throttle / Pedal Position Sensor / Switch "D" Circuit High Input
P2125-153	Throttle / Pedal Position Sensor / Switch "E" Circuit
P2126-109	Throttle / Pedal Position Sensor / Switch "E" Circuit Range / Performance
P2127-107	Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input
P2128-108	Throttle / Pedal Position Sensor / Switch "E" Circuit High Input
P2138-110	Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation
P2138-154	Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation

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DESCRIPTION

The accelerator pedal position sensor is mounted on the accelerator pedal to detect 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 assembly. 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 assembly 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
P2120-152	Throttle / Pedal Position Sensor / Switch "D" Circuit	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 assembly	Does not come on	Master Warning Light: Comes on
P2121-106	Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance	Internal error of 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 assembly	Does not come on	Master Warning Light: Comes on
P2122-104	Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input	Open or short to GND 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 assembly	Does not come on	Master Warning Light: Comes on
P2123-105	Throttle / Pedal Position Sensor / Switch "D" Circuit High Input	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 assembly	Does not come on	Master Warning Light: Comes on
P2125-153	Throttle / Pedal Position Sensor / Switch "E" Circuit	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 assembly	Does not come on	Master Warning Light: Comes on
P2126-109	Throttle / Pedal Position Sensor / Switch "E" Circuit Range / Performance	Internal error 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 assembly	Does not come on	Master Warning Light: Comes on
P2127-107	Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input	Open or short to GND 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 assembly	Does not come on	Master Warning Light: Comes on
P2128-108	Throttle / Pedal Position Sensor / Switch "E" Circuit High Input	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 assembly	Does not come on	Master Warning Light: Comes on
P2138-110	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 assembly	Does not come on	Master Warning Light: Comes on
P2138-154	Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation	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 assembly	Does not come on	Master Warning Light: Comes on

Table 1. Related Data List
DTC No.	Data List
P2120-152	Accel Pedal Pos #1 Accel Pedal Pos #2
P2121-106
P2122-104
P2123-105
P2125-153
P2126-109
P2127-107
P2128-108
P2138-110
P2138-154

Table 2. *a Accelerator Pedal Sensor Assembly *b Hybrid Vehicle Control ECU Assembly

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Tip:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

Wait for approximately 10 seconds with the power switch on (READY) and the shift lever in P, then fully depress and release the accelerator pedal several times.

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PROCEDURE

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READ VALUE USING GTS (ACCEL PEDAL POS #1, ACCEL PEDAL POS #2)

Connect the GTS to the DLC3.
Turn the power switch on (IG).

Enter the following menus: Powertrain / Hybrid Control / Data List / Accel Pedal Pos #1, Accel Pedal Pos #2.

Powertrain > Hybrid Control > Data List

Tester Display
Accel Pedal Pos #1
Accel Pedal Pos #2

Read the Data List.

Standard

Tester Display	Accelerator Pedal Condition	Specified Condition
Accel Pedal Pos #1	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
Accel Pedal Pos #2	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

Turn the power switch off.

Result

Proceed to
OK
NG

OK
CHECK FOR INTERMITTENT PROBLEMSClick here
NGClick here

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CHECK CONNECTOR CONNECTION CONDITION (ACCELERATOR PEDAL SENSOR ASSEMBLY CONNECTOR)

*A	for LHD
*B	for RHD

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

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

Result

Proceed to
OK
NG

OKClick here
NG
CONNECT SECURELY

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CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR)

Result

Proceed to
OK
NG

for LHD

for RHD

Check the connector connections and contact pressure of the relevant terminals for the hybrid vehicle control ECU assembly connectors.

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

Result

Proceed to
OK
NG

OKClick here
NG
CONNECT SECURELY

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CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (CHECK VOLTAGE)

Disconnect the A52 accelerator pedal sensor assembly connector.
Turn the power switch on (IG).

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

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

Standard Voltage

Tester Connection	Condition	Specified Condition
A52-4 (VCP1) - A52-5 (EP1)	Power switch on (IG)	4.5 to 5.5 V
A52-1 (VCP2) - A52-2 (EP2)	Power switch on (IG)	4.5 to 5.5 V

Turn the power switch off.

Reconnect the A52 accelerator pedal sensor assembly connector.

Result

Proceed to
OK
NG

OKClick here
NGClick here

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CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (CHECK RESISTANCE)

Disconnect the A52 accelerator pedal sensor assembly connector.

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A52-6 (VPA1) - A52-5 (EP1)	Power switch off	36.60 to 41.61 kΩ
A52-3 (VPA2) - A52-2 (EP2)	Power switch off	36.60 to 41.61 kΩ

Reconnect the A52 accelerator pedal sensor assembly connector.

Result

Proceed to
OK
NG

OK
REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLYClick here
NGClick here

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

Disconnect the A84 hybrid vehicle control ECU assembly connector.
Disconnect the A52 accelerator pedal sensor assembly connector.
Turn the power switch on (IG).

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU Assembly)

Front view of wire harness connector

(to Accelerator Pedal Sensor Assembly)

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

Standard Voltage

Tester Connection	Condition	Specified Condition
A84-30 (VPA) - Body ground	Power switch on (IG)	Below 1 V
A84-28 (VPA2) - Body ground	Power switch on (IG)	Below 1 V
A84-20 (EPA) - Body ground	Power switch on (IG)	Below 1 V
A84-18 (EPA2) - Body ground	Power switch on (IG)	Below 1 V

Note:

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

Turn the power switch off.

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

Standard Resistance (Check for Open)

Tester Connection	Condition	Specified Condition
A84-30 (VPA) - A52-6 (VPA1)	Power switch off	Below 1 Ω
A84-20 (EPA) - A52-5 (EP1)	Power switch off	Below 1 Ω
A84-28 (VPA2) - A52-3 (VPA2)	Power switch off	Below 1 Ω
A84-18 (EPA2) - A52-2 (EP2)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
A84-30 (VPA) or A52-6 (VPA1) - Body ground and other terminals	Power switch off	10 kΩ or higher
A84-20 (EPA) or A52-5 (EP1) - Body ground and other terminals	Power switch off	10 kΩ or higher
A84-28 (VPA2) or A52-3 (VPA2) - Body ground and other terminals	Power switch off	10 kΩ or higher
A84-18 (EPA2) or A52-2 (EP2) - Body ground and other terminals	Power switch off	10 kΩ or higher

Reconnect the A52 accelerator pedal sensor assembly connector.

Reconnect the A84 hybrid vehicle control ECU assembly connector.

Result

Proceed to
OK
NG

OK
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLYClick here
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the A84 hybrid vehicle control ECU assembly connector.
Disconnect the A52 accelerator pedal sensor assembly connector.
Turn the power switch on (IG).

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU Assembly)

Front view of wire harness connector

(to Accelerator Pedal Sensor Assembly)

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

Standard Voltage

Tester Connection	Condition	Specified Condition
A84-9 (VCPA) - Body ground	Power switch on (IG)	Below 1 V
A84-20 (EPA) - Body ground	Power switch on (IG)	Below 1 V
A84-8 (VCP2) - Body ground	Power switch on (IG)	Below 1 V
A84-18 (EPA2) - Body ground	Power switch on (IG)	Below 1 V

Note:

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

Turn the power switch off.

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

Standard Resistance (Check for Open)

Tester Connection	Condition	Specified Condition
A84-9 (VCPA) - A52-4 (VCP1)	Power switch off	Below 1 Ω
A84-20 (EPA) - A52-5 (EP1)	Power switch off	Below 1 Ω
A84-8 (VCP2) - A52-1 (VCP2)	Power switch off	Below 1 Ω
A84-18 (EPA2) - A52-2 (EP2)	Power switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
A84-9 (VCPA) or A52-4 (VCP1) - Body ground and other terminals	Power switch off	10 kΩ or higher
A84-20 (EPA) or A52-5 (EP1) - Body ground and other terminals	Power switch off	10 kΩ or higher
A84-8 (VCP2) or A52-1 (VCP2) - Body ground and other terminals	Power switch off	10 kΩ or higher
A84-18 (EPA2) or A52-2 (EP2) - Body ground and other terminals	Power switch off	10 kΩ or higher

Reconnect the A52 accelerator pedal sensor assembly connector.

Reconnect the A84 hybrid vehicle control ECU assembly connector.

Result

Proceed to
OK
NG

OK
REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLYClick here
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

HYBRID CONTROL SYSTEM, Diagnostic DTC:P2120-152, P2121-106, P2122-104, P2123-105, P2125-153, P2126-109, P2127-107, P2128-108, P2138-110, P2138-154