DTC P0120-15: Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Battery or Open [02/2019 - 06/2020]: Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

Disconnect the throttle body with motor assembly connector.
Disconnect the ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
C15-1 (VTA) - C45-108 (VTA1)	Always	Below 1 Ω
C15-4 (E2) - C45-110 (ETA)	Always	Below 1 Ω
C15-2 (VC) or C45-109 (VCTA) - Body ground and other terminals	Always	10 kΩ or higher
C15-1 (VTA) or C45-108 (VTA1) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 2

CHECK TERMINAL VOLTAGE (POWER SOURCE OF THROTTLE POSITION SENSOR)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Throttle Body with Motor Assembly)

Disconnect the throttle body with motor assembly connector.
Turn the ignition switch to ON.

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

Standard Voltage

Tester Connection	Condition	Specified Condition
C15-2 (VC) - C15-4 (E2)	Ignition switch ON	4.5 to 5.5 V
C15-1 (VTA) - C15-4 (E2)	Ignition switch ON	3.0 to 5.0 V

Result

Proceed to
OK
NG

Result:

REPLACE ECM

Refer to REMOVAL [02/2019 - 08/2020]

Result:

See step 3

CHECK HARNESS AND CONNECTOR (RESISTANCE OF ECM)

Disconnect the throttle body with motor assembly connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
C15-2 (VC) - C15-1 (VTA)	Ignition switch off	190 to 210 kΩ

Result

Proceed to
OK
NG

Result:

REPLACE ECM

Refer to REMOVAL [02/2019 - 08/2020]

Result:

See step 4

READ VALUE USING TECHSTREAM (THROTTLE POSITION SENSOR NO. 1 VOLTAGE)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Throttle Body with Motor Assembly)

Disconnect the throttle body with motor assembly connector.
Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No. 1 Voltage.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No. 1 Voltage

According to the display on the Techstream, read the Data List.
HINT:

Use the snapshot function to record the value displayed or make a note of it.
Turn the ignition switch off.
Turn the Techstream off.
Connect terminals 4 (E2) and 1 (VTA) of the throttle body with motor assembly connector on the wire harness side.
NOTE:
If the VTA terminal voltage or the resistance between VTA and E2 is abnormal and terminals 1 (VTA) and 4 (E2) of the throttle body with motor assembly connector are connected, excessive current may flow through the circuit. In this case, do not connect the terminals.
Turn the ignition switch to ON.
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No. 1 Voltage.

Powertrain > Engine > Data List

Tester Display
Throttle Position Sensor No. 1 Voltage

Compare the vehicle of the Data List item Throttle Position Sensor No. 1 Voltage after the circuit is shorted to the value when the throttle body with motor assembly connector was connected.

Result

Result	Proceed to
Changes from higher than 4.535 V to less than 0.56 V	A
Does not change from higher than 4.535 V	B

HINT:

Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

Refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 08/2020]

Result:

REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

Refer to REMOVAL [02/2019 - 08/2020]

Result:

REPLACE ECM

Refer to REMOVAL [02/2019 - 08/2020]