The accelerator pedal position sensor is mounted on the accelerator pedal and detects the opening angle of the accelerator pedal. Since this sensor is electronically controlled with Hall-effect elements, accurate control and reliability can be obtained. It has 2 sensors to detect the accelerator position and a malfunction of the accelerator pedal position sensor.

In the accelerator pedal position sensor, the voltage applied to pedal terminals VPA and VPA2 of the ECM changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal opening angle which is used for the engine control, and the VPA2 is a signal to indicate information about the opening angle which is used for detecting malfunctions. The ECM judges the current opening angle of the accelerator pedal using signals from terminals VPA and VPA2, and the ECM controls the throttle motor based on these signals.

Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

P2120
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON Accelerator pedal fully closed for 3 seconds Accelerator pedal open partway for 3 seconds Accelerator pedal fully open for 3 seconds	Condition (a) continues for 0.5 seconds (1 trip detection logic): (a) VPA is less than 0.4 V and VPA2 is more than 0.97 deg, or VPA is more than 4.8 V.	Accelerator pedal position sensor Accelerator pedal Accelerator pedal rod (arm) deformed ECM

P2122
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON Accelerator pedal fully closed for 3 seconds Accelerator pedal open partway for 3 seconds Accelerator pedal fully open for 3 seconds	Condition (a) and (b) continue for 0.5 seconds (1 trip detection logic): (a) VPA is less than 0.4 V. (b) VPA2 is more than 0.97 deg.	Accelerator pedal position sensor Open in VCPA circuit VPA circuit open or ground short Accelerator pedal Accelerator pedal rod (arm) deformed ECM

P2123
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON Accelerator pedal fully closed for 3 seconds Accelerator pedal open partway for 3 seconds Accelerator pedal fully open for 3 seconds	Condition (a) continues for 2.0 seconds (1 trip detection logic): (a) VPA is more than 4.8 V.	Accelerator pedal position sensor Open in EPA circuit Accelerator pedal Accelerator pedal rod (arm) deformed ECM

P2125
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON Accelerator pedal fully closed for 3 seconds Accelerator pedal open partway for 3 seconds Accelerator pedal fully open for 3 seconds	Condition (a) continues for 0.5 seconds (1 trip detection logic): (a) VPA2 is less than 1.2 V and VPA is more than 2.7 deg, or VPA2 is more than 4.8 V and VPA is more than 0.4 V but less than 3.45 V.	Accelerator pedal position sensor Accelerator pedal Accelerator pedal rod (arm) deformed ECM

P2127
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON Accelerator pedal fully closed for 3 seconds Accelerator pedal open partway for 3 seconds Accelerator pedal fully open for 3 seconds	Condition (a) and (b) continue for 0.5 seconds (1 trip detection logic): (a) VPA2 is less than 1.2 V. (b) VPA2 is more than 2.7 deg.	Accelerator pedal position sensor Open in VCP2 circuit VPA2 circuit open or ground short Accelerator pedal Accelerator pedal rod (arm) deformed ECM

P2128
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON Accelerator pedal fully closed for 3 seconds Accelerator pedal open partway for 3 seconds Accelerator pedal fully open for 3 seconds	Conditions (a) and (b) continue for 2.0 seconds (1 trip detection logic): (a) VPA2 is more than 4.8 V. (b) VPA is more than 0.4 V but less than 3.45 V.	Accelerator pedal position sensor Open in EPA2 circuit Accelerator pedal Accelerator pedal rod (arm) deformed ECM

P2138
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON Accelerator pedal fully closed for 3 seconds Accelerator pedal open partway for 3 seconds Accelerator pedal fully open for 3 seconds	Condition (a) or (b) continues for 2.0 seconds (1 trip detection logic): (a) The difference between VPA and VPA2 is less than 0.02 V. (b) VPA is less than 0.4 V and VPA2 is less than 1.2 V.	VPA and VPA2 circuits are short-circuited Accelerator pedal position sensor Accelerator pedal Accelerator pedal rod (arm) deformed ECM

Related Data List
DTC No.	Data List
P2120	Accel Sens. No.1 Volt % Accel Sens. No.2 Volt % Accel Sensor Out No.1 Accel Sensor Out No.2
P2122
P2123
P2125
P2127
P2128
P2138

HINT:

When DTC P2120, P2122, P2123, P2125, P2127, P2128 and/or P2138 is stored, check the output voltage of the accelerator pedal position sensor by entering the following menus: Powertrain / Engine / Data List / Accel Sensor Out No.1 and Accel Sensor Out No.2.

Trouble Area	Accelerator Pedal Position Expressed as Voltage Output
	Accelerator Pedal Released		Accelerator Pedal Depressed
	Accel Sensor Out No.1	Accel Sensor Out No.2	Accel Sensor Out No.1	Accel Sensor Out No.2
VC circuit open	0 to 0.2 V	0 to 0.2 V	0 to 0.2 V	0 to 0.2 V
VPA circuit open or ground short	0 to 0.2 V	1.2 to 2.0 V	0 to 0.2 V	3.4 to 5.0 V
VPA2 circuit open or ground short	0.5 to 1.1 V	0 to 0.2 V	2.9 to 3.6 V	0 to 0.2 V
EPA circuit open	4.5 to 5.0 V	4.5 to 5.0 V	4.5 to 5.0 V	4.5 to 5.0 V

WIRING DIAGRAM

Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

NOTICE:

After replacing the ECM, the new ECM needs registration () and initialization ().

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

1.READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION)

Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON and turn the tester on.

Enter the following menus: Powertrain / Engine / Data List / Accel Sens. No.1 Volt % and Accel Sens. No.2 Volt %.

Read the values.

Standard:
Accelerator Pedal Accel Sens. No.1 Volt % Accel Sens. No.2 Volt %
Released 10 to 22% 24 to 40%
Depressed 52 to 90% 68 to 99%

Result
Result	Proceed to
NG	A
OK	B

Go to step 8

A

2.CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM)

Disconnect the accelerator pedal position sensor connector.

Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

for LHD
Tester Connection	Condition	Specified Condition
A31-1 (VCP2) - A38-56 (VCP2)	Always	Below 1 Ω
A31-2 (EPA2) - A38-58 (EPA2)	Always	Below 1 Ω
A31-3 (VPA2) - A38-54 (VPA2)	Always	Below 1 Ω
A31-4 (VCPA) - A38-55 (VCPA)	Always	Below 1 Ω
A31-5 (EPA) - A38-57 (EPA)	Always	Below 1 Ω
A31-6 (VPA) - A38-53 (VPA)	Always	Below 1 Ω

for RHD
Tester Connection	Condition	Specified Condition
A31-1 (VCP2) - A52-56 (VCP2)	Always	Below 1 Ω
A31-2 (EPA2) - A52-58 (EPA2)	Always	Below 1 Ω
A31-3 (VPA2) - A52-54 (VPA2)	Always	Below 1 Ω
A31-4 (VCPA) - A52-55 (VCPA)	Always	Below 1 Ω
A31-5 (EPA) - A52-57 (EPA)	Always	Below 1 Ω
A31-6 (VPA) - A52-53 (VPA)	Always	Below 1 Ω

Standard Resistance (Check for Short):

for LHD
Tester Connection	Condition	Specified Condition
A31-1 (VCP2) or A38-56 (VCP2) - Body ground	Always	10 kΩ or higher
A31-2 (EPA2) or A38-58 (EPA2) - Body ground	Always	10 kΩ or higher
A31-3 (VPA2) or A38-54 (VPA2) - Body ground	Always	10 kΩ or higher
A31-4 (VCPA) or A38-55 (VCPA) - Body ground	Always	10 kΩ or higher
A31-5 (EPA) or A38-57 (EPA) - Body ground	Always	10 kΩ or higher
A31-6 (VPA) or A38-53 (VPA) - Body ground	Always	10 kΩ or higher

for RHD
Tester Connection	Condition	Specified Condition
A31-1 (VCP2) or A52-56 (VCP2) - Body ground	Always	10 kΩ or higher
A31-2 (EPA2) or A52-58 (EPA2) - Body ground	Always	10 kΩ or higher
A31-3 (VPA2) or A52-54 (VPA2) - Body ground	Always	10 kΩ or higher
A31-4 (VCPA) or A52-55 (VCPA) - Body ground	Always	10 kΩ or higher
A31-5 (EPA) or A52-57 (EPA) - Body ground	Always	10 kΩ or higher
A31-6 (VPA) or A52-53 (VPA) - Body ground	Always	10 kΩ or higher

Go to step 7

OK

3.INSPECT ECM TERMINAL VOLTAGE (VCPA AND VCP2 TERMINALS)

Disconnect the accelerator pedal position sensor connector.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
A31-4 (VCPA) - A31-5 (EPA) Ignition switch ON 4.5 to 5.5 V
A31-1 (VCP2) - A31-2 (EPA2) Ignition switch ON 4.5 to 5.5 V

Go to step 6

OK

4.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

Replace the accelerator pedal rod assembly ().

NEXT

5.CHECK IF OUTPUT DTC RECURS

Connect the intelligent tester to the DLC3.

Clear the DTC ().

Turn the ignition switch off.

Turn the ignition switch to ON.

Fully close the accelerator pedal for 3 seconds, then hold it partway open for 3 seconds, then fully open it for 3 seconds.

Read the DTCs.

Result
Result	Proceed to
P2120, P2122, P2123, P2125, P2127, P2128 and/or P2138 are output again	A
No output	B

END

A

6.REPLACE ECM

Replace the ECM ().

Go to step 8

7.REPAIR OR REPLACE HARNESS OR CONNECTOR

NEXT

8.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the intelligent tester to the DLC3.

Clear the DTCs ().

Turn the ignition switch off.

Turn the ignition switch off and leave the vehicle for 15 seconds.

Turn the ignition switch to ON.

Fully close the accelerator pedal for 3 seconds, then hold it partway open for 3 seconds, then fully open it for 3 seconds.

Confirm that the DTC is not output again.

HINT:

Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Input DTC P2120, P2122, P2123, P2125, P2127, P2128 and/or P2138.

Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, idle the engine.

END

1VD-FTV ENGINE CONTROL

Land Cruiser URJ200 URJ202 GRJ200 VDJ200

ECD SYSTEM w/o DPF

Accelerator Pedal	Accel Sens. No.1 Volt %	Accel Sens. No.2 Volt %
Released	10 to 22%	24 to 40%
Depressed	52 to 90%	68 to 99%

Tester Connection	Switch Condition	Specified Condition
A31-4 (VCPA) - A31-5 (EPA)	Ignition switch ON	4.5 to 5.5 V
A31-1 (VCP2) - A31-2 (EPA2)	Ignition switch ON	4.5 to 5.5 V