ECD SYSTEM (w/o EGR Cooler), Diagnostic DTC:P2120, P2122, P2123, P2125, P2127, P2128, P2138

DTC Code DTC Name
P2120 Throttle / Pedal Position Sensor / Switch "D" Circuit
P2122 Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input
P2123 Throttle / Pedal Position Sensor / Switch "D" Circuit High Input
P2125 Throttle / Pedal Position Sensor / Switch "E" Circuit
P2127 Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input
P2128 Throttle / Pedal Position Sensor / Switch "E" Circuit High Input
P2138 Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation

DESCRIPTION

Tech Tips


  • This is the repair procedure for the accelerator pedal position sensor.

  • This electrical throttle system does not use a throttle cable.

  • 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.

A01DWGRE11
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

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2122 VPA is 0.4 V or less for 0.5 sec. or more when VPA2 output indicate accelerator pedal is opened

  • Accelerator pedal position sensor

  • Open in VCPA circuit

  • VPA circuit open or ground short

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2123

Condition (a) continues for 2.0 sec. or more:

(a) VPA is 4.8 V or more

  • Accelerator pedal position sensor

  • Open in EPA circuit

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • 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

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2127 VPA2 is 1.2 V or less for 0.5 sec. or more when VPA output indicates accelerator pedal is opened

  • Accelerator pedal position sensor

  • Open in VCP2 circuit

  • VPA2 circuit open or ground short

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • 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

  • Accelerator pedal position sensor

  • Open in EPA2 circuit

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • 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

  • VPA and VPA2 circuits are short circuited

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM

WIRING DIAGRAM

A01DW39E05

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips

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.

PROCEDURE


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


    1. A01DZASE07

      Connect the intelligent tester to the DLC3.

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

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

    4. 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%

    OK

    CHECK IF OUTPUT DTC RECURS Click here

    NG

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


    1. A01E2PSE09

      Disconnect the A13 sensor connector.

    2. Disconnect the E5 ECM connector.

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

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      VCP2 (A13-1) - VCP2 (E5-27) Below 1 Ω
      EPA2 (A13-2) - EPA2 (E5-29) Below 1 Ω
      VPA2 (A13-3) - VPA2 (E5-23) Below 1 Ω
      VCPA (A13-4) - VCPA (E5-26) Below 1 Ω
      EPA (A13-5) - EPA (E5-28) Below 1 Ω
      VPA (A13-6) - VPA (E5-22) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      VCP2 (A13-1) or VCP2 (E5-27) - Body ground 10 kΩ or higher
      EPA2 (A13-2) or EPA2 (E5-29) - Body ground 10 kΩ or higher
      VPA2 (A13-3) or VPA2 (E5-23) - Body ground 10 kΩ or higher
      VCPA (A13-4) or VCPA (E5-26) - Body ground 10 kΩ or higher
      EPA (A13-5) or EPA (E5-28) - Body ground 10 kΩ or higher
      VPA (A13-6) or VPA (E5-22) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ECM (VCPA AND VCP2 VOLTAGE)


    1. A01E1B9E12

      Disconnect the A13 sensor APP connector.

    2. Turn the ignition switch ON.

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

      Standard voltage
      Tester Connection Specified Condition
      VCPA (E5-26) - EPA (E5-28) 4.5 to 5.5 V
      VCP2 (E5-27) - EPA2 (E5-29)

    NG

    REPLACE ECM Click here

    OK

  4. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY


    1. Replace accelerator pedal rod assembly Click here.


    NEXT

  5. CHECK IF OUTPUT DTC RECURS


    1. Connect the intelligent tester to the DLC3.

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

    3. Clear DTCs Click here.

    4. Start the engine.

    5. Allow the engine to idle for 15 seconds.

    6. Enter the following menus: Powertrain / Engine / DTC.

    7. 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 Click here