СИСТЕМА ECD, Diagnostic DTC:P2122, P2123, P2127, P2128

DTC Code DTC Name
P2122 Throttle / Pedal Position Sensor / Switch "D" Circuit Low
P2123 Throttle / Pedal Position Sensor / Switch "D" Circuit High
P2127 Throttle / Pedal Position Sensor / Switch "E" Circuit Low
P2128 Throttle / Pedal Position Sensor / Switch "E" Circuit High

DESCRIPTION

The Accelerator Pedal Position (APP) 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 malfunctions of the accelerator pedal sensor assembly.

In the accelerator pedal sensor assembly, 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 which indicates the actual accelerator pedal opening angle and is used for engine control, and the VPA2 is a signal which indicates the information about the opening angle and 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 injection volume based on these signals.

A01IUAYE01
DTC No. DTC Detection Condition Trouble Area

P2122

P2123

P2127

P2128

  • Condition (a) or (b) continues for 0.5 seconds or more:

    (1 trip detection logic)


    1. VPA is less than 0.2 V when accelerator pedal is fully released, or VPA is more than 4.8 V

    2. VPA2 is less than 0.5 V when accelerator pedal is fully released, or VPA2 is more than 4.8 V

  • Open or short in accelerator pedal sensor assembly circuit

  • Accelerator pedal sensor assembly

  • ECM
Related Data List
DTC No. Data List

P2122

P2123

P2127

P2128

  • Accel Sens. No. 1 Volt %

  • Accel Sens. No. 2 Volt %

WIRING DIAGRAM

A01IPCWE39

INSPECTION PROCEDURE

Note

When replacing the ECM, the ECM needs Registration and Initialization Click here.

Tech Tips


  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • 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.

PROCEDURE


  1. READ VALUE USING GTS (ACCELERATOR PEDAL POSITION)


    1. A01INVZE03
      Text in Illustration
      *1 Accelerator Pedal
      *a Depressed
      *b Released

      Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / 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

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    NG

    CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL SENSOR ASSEMBLY - ECM) Click here

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


    1. Disconnect the accelerator pedal position sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A2-1 (VCP2) - A76-29 (VCP2) Always Below 1 Ω
      A2-2 (EPA2) - A76-23 (EPA2) Always Below 1 Ω
      A2-3 (VPA2) - A76-43 (VPA2) Always Below 1 Ω
      A2-4 (VCPA) - A76-27 (VCPA) Always Below 1 Ω
      A2-5 (EPA) - A76-22 (EPA) Always Below 1 Ω
      A2-6 (VPA) - A76-52 (VPA) Always Below 1 Ω
      A2-1 (VCP2) or A76-29 (VCP2) - Body ground Always 10 kΩ or higher
      A2-2 (EPA2) or A76-23 (EPA2) - Body ground Always 10 kΩ or higher
      A2-3 (VPA2) or A76-43 (VPA2) - Body ground Always 10 kΩ or higher
      A2-4 (VCPA) or A76-27 (VCPA) - Body ground Always 10 kΩ or higher
      A2-5 (EPA) or A76-22 (EPA) - Body ground Always 10 kΩ or higher
      A2-6 (VPA) or A76-52 (VPA) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)


    1. A01ISBAE36
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Accelerator Pedal Position Sensor)

      Disconnect the accelerator pedal position sensor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A2-4 (VCPA) - A2-5 (EPA) Ignition switch ON 4.5 to 5.5 V
      A2-1 (VCP2) - A2-2 (EPA2) Ignition switch ON 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

  4. REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY


    1. Replace the accelerator pedal sensor assembly Click here.


    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 60 seconds or more.

    5. Turn the ignition switch to ON.

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

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

    8. Read the DTCs.

      Result
      Result Proceed to
      DTC P2122, P2123, P2127 and/or P2128 A
      No DTC output B

    B

    END

    A

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  7. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  8. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs Click here.

    4. Turn the ignition switch off and wait for 60 seconds or more.

    5. Turn the ignition switch to ON.

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

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

    8. Confirm that the DTC is not output again.


    NEXT

    END