ECD SYSTEM, Diagnostic DTC:P2122, P060D, P2123, P2127, P2128

DTC Code DTC Name
P2122 Throttle / Pedal Position Sensor / Switch "D" Circuit Low
P060D Internal Control Module Accelerator Pedal Position Performance
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.

A01QPCWE04
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P060D Internal Control Module Accelerator Pedal Position Performance

The difference between the accelerator pedal voltage VPA and VPA2 is the specified value or less, or the specified value or more.

(1 trip detection logic)

  • Open or short in accelerator pedal sensor assembly circuit

  • Accelerator pedal sensor assembly

  • ECM

 Comes on DTC stored
P2122 Throttle / Pedal Position Sensor / Switch "D" Circuit Low

Condition (a) or (b) continues for 0.5 seconds or more (1 trip detection logic):


  • (a) VPA is less than 0.2 V when accelerator pedal is fully released, or VPA is more than 4.8 V

  • (b) 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

 Comes on DTC stored
P2123 Throttle / Pedal Position Sensor / Switch "D" Circuit High

Condition (a) or (b) continues for 0.5 seconds or more (1 trip detection logic):


  • (a) VPA is less than 0.2 V when accelerator pedal is fully released, or VPA is more than 4.8 V

  • (b) 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

 Comes on DTC stored
P2127 Throttle / Pedal Position Sensor / Switch "E" Circuit Low

Condition (a) or (b) continues for 0.5 seconds or more (1 trip detection logic):


  • (a) VPA is less than 0.2 V when accelerator pedal is fully released, or VPA is more than 4.8 V

  • (b) 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

 Comes on DTC stored
P2128 Throttle / Pedal Position Sensor / Switch "E" Circuit High

Condition (a) or (b) continues for 0.5 seconds or more (1 trip detection logic):


  • (a) VPA is less than 0.2 V when accelerator pedal is fully released, or VPA is more than 4.8 V

  • (b) 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

 Comes on DTC stored
Related Data List
DTC No. Data List

P2122

P2123

P2127

P2128

P060D

  • Accel Sens. No.1 Volt %

  • Accel Sens. No.2 Volt %

WIRING DIAGRAM

A01QS8QE04
*a Accelerator Pedal Sensor Assembly

CAUTION / NOTICE / HINT

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. A01QRCQC01
      *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 %.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Accel Sens. No.1 Volt %
      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%
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 8 Click here

    NG

  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
      A6-1 (VCP2) - A62-29 (VCP2) Always Below 1 Ω
      A6-2 (EPA2) - A62-23 (EPA2) Always Below 1 Ω
      A6-3 (VPA2) - A62-43 (VPA2) Always Below 1 Ω
      A6-4 (VCPA) - A62-27 (VCPA) Always Below 1 Ω
      A6-5 (EPA) - A62-22 (EPA) Always Below 1 Ω
      A6-6 (VPA) - A62-52 (VPA) Always Below 1 Ω
      A6-1 (VCP2) or A62-29 (VCP2) - Body ground Always 10 kΩ or higher
      A6-2 (EPA2) or A62-23 (EPA2) - Body ground Always 10 kΩ or higher
      A6-3 (VPA2) or A62-43 (VPA2) - Body ground Always 10 kΩ or higher
      A6-4 (VCPA) or A62-27 (VCPA) - Body ground Always 10 kΩ or higher
      A6-5 (EPA) or A62-22 (EPA) - Body ground Always 10 kΩ or higher
      A6-6 (VPA) or A62-52 (VPA) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)

    A01QTQTC22
    *a

    Front view of wire harness connector

    (to Accelerator Pedal Position Sensor)

    1. Disconnect the accelerator pedal position sensor connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A6-4 (VCPA) - A6-5 (EPA) Ignition switch ON 4.5 to 5.5 V
      A6-1 (VCP2) - A6-2 (EPA2) Ignition switch ON 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ECM Click here

    OK

  4. REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY


    1. Replace the accelerator pedal sensor assembly.

      Click here

      Result
      Proceed to
      NEXT

    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.


      Powertrain > Engine and ECT > Clear DTCs

    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.


      Powertrain > Engine and ECT > Trouble Codes

    8. Read the DTCs.

      Result
      Result Proceed to
      DTC P2122, P2123, P2127, P2128 and/or P060D A
      No DTC output B

    B

    END

    A

  6. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 8 Click here

  7. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    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.


      Powertrain > Engine and ECT > Clear DTCs

    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.


      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

      Result
      Proceed to
      NEXT

    NEXT

    END