Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (ACCEL SENS. NO.1 VOLT % AND ACCEL SENS. NO.2 VOLT %)

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

INSPECT ECM (VCPA AND VCP2 VOLTAGE)

REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

CHECK IF OUTPUT DTC RECURS

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 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 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 the 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.

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit


DTC No.
DTC Detection Condition
(All of following are 1 trip detection logic)
Trouble Area
P2120
Condition (a) continues for 0.5 sec. or more:
(a) VPA is 0.4 V or less
(b) VPA is 4.8 V or more
  1. Accelerator pedal position sensor
  2. Accelerator pedal
  3. Accelerator pedal rod (arm) deformed
  4. ECM
P2122
VPA is 0.4 V or less for 0.5 sec. or more when VPA2 output indicate accelerator pedal is opened
  1. Accelerator pedal position sensor
  2. Open in VCPA circuit
  3. VPA circuit open or ground short
  4. Accelerator pedal
  5. Accelerator pedal rod (arm) deformed
  6. ECM
P2123
Condition (a) continues for 2.0 sec. or more:
(a) VPA is 4.8 V or more
  1. Accelerator pedal position sensor
  2. Open in EPA circuit
  3. Accelerator pedal
  4. Accelerator pedal rod (arm) deformed
  5. ECM
P2125
Condition (a) or (b) continues for 0.5 sec. or more:
(a) VPA2 is 1.2 V or less
(b) VPA2 is 4.8 V or more
  1. Accelerator pedal position sensor
  2. Accelerator pedal
  3. Accelerator pedal rod (arm) deformed
  4. ECM
P2127
VPA2 is 1.2 V or less for 0.5 sec. or more when VPA output indicates accelerator pedal is opened
  1. Accelerator pedal position sensor
  2. Open in VCP2 circuit
  3. VPA2 circuit open or ground short
  4. Accelerator pedal
  5. Accelerator pedal rod (arm) deformed
  6. ECM
P2128
Conditions (a) and (b) continue for 2.0 sec. or more:
(a) VPA2 is 4.8 V or more
(b) VPA is 0.4 V or more and VPA is 3.45 V or less
  1. Accelerator pedal position sensor
  2. Open in EPA2 circuit
  3. Accelerator pedal
  4. Accelerator pedal rod (arm) deformed
  5. ECM
P2138
Condition (a) or (b) continues for 2.0 sec. or more:
(a) Difference between VPA and VPA2 is 0.02 V or less
(b) VPA is 0.4 V or less and VPA2 is 1.2 V or less
  1. VPA and VPA2 circuits are short circuited
  2. Accelerator pedal position sensor
  3. Accelerator pedal
  4. Accelerator pedal rod (arm) deformed
  5. ECM

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit


INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (Toyota Fortuner RM0000012XK04BX.html) and initialization (Toyota Fortuner RM000000TIN04NX.html).
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 (ACCEL SENS. NO.1 VOLT % AND ACCEL SENS. NO.2 VOLT %)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the tester 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 Operation
    		Accel Sens. No.1 Volt %
    		Accel Sens. No.2 Volt %
    Released
    		8 to 28%
    		30 to 55%
    Depressed
    		51 to 86%
    		73 to 98%


OK
Go to step 5
NG


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


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

  1. Disconnect the A22 sensor connector.

  1. Disconnect the E4 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    VCP2 (A22-1) - VCP2 (E4-27)
    		Below 1 Ω
    EPA2 (A22-2) - EPA2 (E4-29)
    		Below 1 Ω
    VPA2 (A22-3) - VPA2 (E4-23)
    		Below 1 Ω
    VCPA (A22-4) - VCPA (E4-26)
    		Below 1 Ω
    EPA (A22-5) - EPA (E4-28)
    		Below 1 Ω
    VPA (A22-6) - VPA (E4-22)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    VCP2 (A22-1) or VCP2 (E4-27) - Body ground
    		10 kΩ or higher
    EPA2 (A22-2) or EPA2 (E4-29) - Body ground
    		10 kΩ or higher
    VPA2 (A22-3) or VPA2 (E4-23) - Body ground
    		10 kΩ or higher
    VCPA (A22-4) or VCPA (E4-26) - Body ground
    		10 kΩ or higher
    EPA (A22-5) or EPA (E4-28) - Body ground
    		10 kΩ or higher
    VPA (A22-6) or VPA (E4-22) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT ECM (VCPA AND VCP2 VOLTAGE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Kd-Ftv Engine Control System.Ecd System. Dtc P2120 Throttle / Pedal Position Sensor / Switch D Circuit

  1. Disconnect the A22 sensor APP connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage between the terminals of the ECM connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    VCPA (E4-26) - EPA (E4-28)
    		4.5 to 5.5 V
    VCP2 (E4-27) - EPA2 (E4-29)


NG
REPLACE ECM (Toyota Fortuner RM0000013Z0004X.html)
OK


4.REPLACE ACCELERATOR PEDAL ROD ASSEMBLY

  1. Replace accelerator pedal rod assembly (Toyota Fortuner RM0000013ZF006X.html).


NEXT


5.CHECK IF OUTPUT DTC RECURS

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the tester ON.

  1. Clear DTCs (Toyota Fortuner RM0000012WY00RX.html).

  1. Start the engine.

  1. Allow the engine to idle for 15 seconds.

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

  1. Read the DTC.

    Result:

    Display (DTC output)
    		Proceed to
    P2120, P2122, P2123, P2125, P2127, P2128, or P2138 is output again
    		A
    No output
    		B


B
END
A

REPLACE ECM (Toyota Fortuner RM0000013Z0004X.html)