Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (ACCELERATOR PEDAL POSITION)

CHECK ECM (ACCELERATOR PEDAL POSITION SENSOR VOLTAGE)

INSPECT ACCELERATOR PEDAL SENSOR ASSEMBLY (VPA, VPA2 VOLTAGE)

INSPECT ECM TERMINAL VOLTAGE (VCPA AND VCP2 TERMINALS)

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

CHECK ECM (CHECK RESISTANCE)

REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P2120 Throttle / Pedal Position Sensor / Switch "D" Circuit

DTC P2122 Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input

DTC P2123 Throttle / Pedal Position Sensor / Switch "D" Circuit High Input

DTC P2125 Throttle / Pedal Position Sensor / Switch "E" Circuit

DTC P2127 Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input

DTC P2128 Throttle / Pedal Position Sensor / Switch "E" Circuit High Input

DTC P2138 Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation


DESCRIPTION

HINT:
  1. This is the repair procedure for the accelerator pedal position sensor.
  2. This electrical throttle system does not use a throttle cable.
  3. This accelerator pedal position sensor is a non-contact type.
The accelerator pedal position sensor is mounted on the accelerator pedal sensor assembly 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 terminals VPA and VPA2 of the ECM changes between 0.5 V and 4.8 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 engine control, and the VPA2 is a signal to indicate information about the opening angle which is used for detecting malfunctions. The ECM determines 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.

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit


P2120
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG)
  1. Accelerator pedal fully released for 3 seconds
  2. Accelerator pedal depressed partway for 3 seconds
  3. Accelerator pedal fully depressed for 3 seconds
Condition (a) continues for 0.5 seconds (1 trip detection logic):
(a) VPA is below 0.4 V and VPA2 is more than 2.7 deg, or VPA is higher than 4.8 V.
  1. Accelerator pedal sensor assembly
  2. Accelerator pedal rod (arm) deformed
  3. ECM

P2122
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG)
  1. Accelerator pedal fully released for 3 seconds
  2. Accelerator pedal depressed partway for 3 seconds
  3. Accelerator pedal fully depressed for 3 seconds
Conditions (a) and (b) continue for 0.5 seconds (1 trip detection logic):
(a) VPA is below 0.4 V.
(b) VPA2 is more than 2.7 deg.
  1. Accelerator pedal sensor assembly
  2. Open in VCPA circuit
  3. VPA circuit open or shorted to ground
  4. Accelerator pedal rod (arm) deformed
  5. ECM

P2123
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG)
  1. Accelerator pedal fully released for 3 seconds
  2. Accelerator pedal depressed partway for 3 seconds
  3. Accelerator pedal fully depressed for 3 seconds
Condition (a) continues for 2.0 seconds (1 trip detection logic):
(a) VPA is higher than 4.8 V.
  1. Accelerator pedal sensor assembly
  2. Open in EPA circuit
  3. Accelerator pedal assembly
  4. Accelerator pedal rod (arm) deformed
  5. ECM

P2125
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG)
  1. Accelerator pedal fully released for 3 seconds
  2. Accelerator pedal depressed partway for 3 seconds
  3. Accelerator pedal fully depressed for 3 seconds
Condition (a) continues for 0.5 seconds (1 trip detection logic):
(a) VPA2 is below 1.2 V and VPA is more than 2.7 deg, or VPA2 is higher than 4.8 V and VPA is higher than 0.4 V but below 3.45 V.
  1. Accelerator pedal sensor assembly
  2. Accelerator pedal rod (arm) deformed
  3. ECM

P2127
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG)
  1. Accelerator pedal fully released for 3 seconds
  2. Accelerator pedal depressed partway for 3 seconds
  3. Accelerator pedal fully depressed for 3 seconds
Conditions (a) and (b) continue for 0.5 seconds (1 trip detection logic):
(a) VPA2 is below 1.2 V.
(b) VPA1 is more than 2.7 deg.
  1. Accelerator pedal sensor assembly
  2. Open in VCP2 circuit
  3. VPA2 circuit open or shorted to ground
  4. Accelerator pedal rod (arm) deformed
  5. ECM

P2128
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG)
  1. Accelerator pedal fully released for 3 seconds
  2. Accelerator pedal depressed partway for 3 seconds
  3. Accelerator pedal fully depressed for 3 seconds
Conditions (a) and (b) continue for 2.0 seconds (1 trip detection logic):
(a) VPA2 is higher than 4.8 V.
(b) VPA is higher than 0.4 V but below 3.45 V.
  1. Accelerator pedal sensor assembly
  2. Open in EPA2 circuit
  3. Accelerator pedal rod (arm) deformed
  4. ECM

P2138
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Engine switch on (IG)
  1. Accelerator pedal fully released for 3 seconds
  2. Accelerator pedal depressed partway for 3 seconds
  3. Accelerator pedal fully depressed for 3 seconds
Conditions (a) or (b) continue for 2.0 seconds (1 trip detection logic):
(a) The difference between VPA and VPA2 is less than 0.02 V.
(b) VPA is below 0.4 V and VPA2 is below 1.2 V.
  1. VPA and VPA2 circuits are short-circuited
  2. Accelerator pedal sensor assembly
  3. Accelerator pedal rod (arm) deformed
  4. ECM

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

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit


INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0AVX.html) and initialization (LandCruiser RM000000TIN08IX.html).
HINT:
Read freeze frame data using the GTS. 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 GTS (ACCELERATOR PEDAL POSITION)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

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

  1. Read the values.

    Standard Voltage:
    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%
    Text in Illustration
    *1
    		Accelerator Pedal Assembly
    *a
    		Depressed
    *b
    		Released
    Result
    Result
    		Proceed to
    NG
    		A
    OK
    		B


B
Go to step 10
A


2.CHECK ECM (ACCELERATOR PEDAL POSITION SENSOR VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G185-29 (VCPA) - G185-22 (EPA)
    		Engine switch on (IG)
    		4.5 to 5.5 V
    G185-30 (VCP2) - G185-25 (EPA2)
    		Engine switch on (IG)
    		4.5 to 5.5 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
Go to step 8
OK


3.INSPECT ACCELERATOR PEDAL SENSOR ASSEMBLY (VPA, VPA2 VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G185-28 (VPA) - G185-22 (EPA)
    		Engine switch on (IG), accelerator pedal fully released
    		0.5 to 1.1 V
    Engine switch on (IG), accelerator pedal fully depressed
    		0.5 to 1.1 V
    C185-31 (VPA2) - G185-25 (EPA2)
    		Engine switch on (IG), accelerator pedal fully released
    		0.9 to 2.3 V
    Engine switch on (IG), accelerator pedal fully depressed
    		0.9 to 2.3 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


OK
Go to step 8
NG


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

  1. Disconnect the accelerator pedal sensor assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A19-4 (VCPA) - A19-5 (EPA)
    		Engine switch on (IG)
    		4.5 to 5.5 V
    A19-1 (VCP2) - A19-2 (EPA2)
    		Engine switch on (IG)
    		4.5 to 5.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Accelerator Pedal Position Sensor)

  1. Reconnect the accelerator pedal sensor assembly connector.



NG
Go to step 9
OK


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

  1. Disconnect the accelerator pedal sensor assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    A19-6 (VPA) - G50-28 (VPA)
    		Always
    		Below 1 Ω
    A19-5 (EPA) - G185-22 (EPA)
    		Always
    		Below 1 Ω
    A19-3 (VPA2) - G185-31 (VPA2)
    		Always
    		Below 1 Ω
    A19-2 (EPA2) - G185-25 (EPA2)
    		Always
    		Below 1 Ω
    A19-6 (VPA) or G185-28 (VPA) - Body ground and other terminals
    		Always
    		10 kΩ or higher
    A19-5 (EPA) or G185-22 (EPA) - Body ground and other terminals
    		Always
    		10 kΩ or higher
    A19-3 (VPA2) or G185-31 (VPA2) - Body ground and other terminals
    		Always
    		10 kΩ or higher
    A19-2 (EPA2) or G185-25 (EPA2) - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reconnect the accelerator pedal sensor assembly connector.

  1. Reconnect the ECM connector.



NG
Go to step 10
OK


6.CHECK ECM (CHECK RESISTANCE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

  1. Disconnect the accelerator pedal sensor assembly connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    G185-29 (VCPA) - G185-28 (VPA)
    		Engine switch off
    		No short or open circuit
    G185-28 (VPA) - G185-22 (EPA)
    		Engine switch off
    		No short or open circuit
    G185-30 (VCP2) - G185-31 (VPA2)
    		Engine switch off
    		No short or open circuit
    G185-31 (VPA2) - G185-25 (EPA2)
    		Engine switch off
    		No short or open circuit

  1. Reconnect the accelerator pedal sensor assembly connector.



NG
Go to step 8
OK


7.REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY

  1. Replace the accelerator pedal sensor assembly (LandCruiser RM00000463000CX.html).



NEXT
Go to step 10

8.REPLACE ECM

  1. Replace the ECM (LandCruiser RM0000013Z002DX.html).



NEXT
Go to step 10

9.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.


NEXT


10.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the GTS to the DLC3.

  1. Clear the DTCs (LandCruiser RM000000PDK1ENX.html).

  1. Turn the engine switch off and leave the vehicle for 30 seconds.

  1. Turn the engine switch on (IG).

  1. Fully release the accelerator pedal for 3 seconds or more, then depress it partway for 3 seconds or more, and then fully depress it for 3 seconds or more.

  1. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  1. Confirm that the DTC is not output again.


NEXT

END