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 sensor assembly.

  • 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 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 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.

B003LLKE39
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P2120 Throttle / Pedal Position Sensor / Switch "D" Circuit

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.

  • Accelerator pedal sensor assembly

  • Accelerator pedal rod (arm) deformed

  • ECM

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

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.

  • Accelerator pedal sensor assembly

  • Open in VCPA circuit

  • VPA circuit open or shorted to ground

  • Accelerator pedal rod (arm) deformed

  • ECM

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

Condition (a) continues for 2.0 seconds (1 trip detection logic):

(a) VPA is higher than 4.8 V.

  • Accelerator pedal sensor assembly

  • Open in EPA circuit

  • Accelerator pedal rod (arm) deformed

  • ECM

 Comes on DTC stored
P2125 Throttle / Pedal Position Sensor / Switch "E" Circuit

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.

  • Accelerator pedal sensor assembly

  • Accelerator pedal rod (arm) deformed

  • ECM

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

Conditions (a) and (b) continue for 0.5 seconds (1 trip detection logic):

(a) VPA2 is below 1.2 V.

(b) VPA is more than 2.7 deg.

  • Accelerator pedal sensor assembly

  • Open in VCP2 circuit

  • VPA2 circuit open or shorted to ground

  • Accelerator pedal rod (arm) deformed

  • ECM

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

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.

  • Accelerator pedal sensor assembly

  • Open in EPA2 circuit

  • Accelerator pedal rod (arm) deformed

  • ECM

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

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.

  • VPA and VPA2 circuits are short-circuited

  • Accelerator pedal sensor assembly

  • Accelerator pedal rod (arm) deformed

  • ECM

 Comes on DTC stored
Related Data List
DTC No. Data List
P2120

  • Accel Position

  • Accel Sens. No.1 Volt %

  • Accel Sens. No.2 Volt %
P2122
P2123
P2125
P2127
P2128
P2138

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P2120

Ignition switch ON


  • Accelerator pedal fully released for 3 seconds

  • Accelerator pedal depressed partway for 3 seconds

  • Accelerator pedal fully depressed for 3 seconds
P2122
P2123
P2125
P2127
P2128
P2138

WIRING DIAGRAM

B003LXNE11
*a Accelerator Pedal Position Sensor (Accelerator Pedal Sensor Assembly)

CAUTION / NOTICE / HINT

Note

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

Tech Tips

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 (ACCEL SENS.)


    1. 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. B003LB9C03
      *1 Accelerator Pedal Assembly
      *a Depressed
      *b Released

      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 9 Click here

    NG

  2. CHECK ECM (ACCELERATOR PEDAL POSITION SENSOR VOLTAGE)


    1. B003RR1C39
      *a Component with harness connected (ECM)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G50-29 (VCPA) - G50-22 (EPA) Ignition switch ON 4.5 to 5.5 V
      G50-30 (VCP2) - G50-25 (EPA2) Ignition switch ON 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ECM Click here

    OK

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


    1. B003RR1C40
      *a

      Component with harness connected

      (ECM)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G50-28 (VPA) - G50-22 (EPA) Ignition switch ON, accelerator pedal fully released 0.5 to 1.1 V
      Ignition switch ON, accelerator pedal fully depressed 3.0 to 4.6 V
      G50-31 (VPA2) - G50-25 (EPA2) Ignition switch ON, accelerator pedal fully released 0.9 to 2.3 V
      Ignition switch ON, accelerator pedal fully depressed 3.4 to 5.0 V
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 10 Click here

    NG

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


    1. Disconnect the accelerator pedal sensor assembly connector.

    2. B003O9OC64
      *a

      Front view of wire harness connector

      (to Accelerator Pedal Sensor Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A30-4 (VCPA) - A30-5 (EPA) Ignition switch ON 4.5 to 5.5 V
      A30-1 (VCP2) - A30-2 (EPA2) Ignition switch ON 4.5 to 5.5 V

    3. Reconnect the accelerator pedal sensor assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

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


    1. Disconnect the accelerator pedal sensor assembly 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
      A30-6 (VPA) - G50-28 (VPA) Always Below 1 Ω
      A30-5 (EPA) - G50-22 (EPA) Always Below 1 Ω
      A30-3 (VPA2) - G50-31 (VPA2) Always Below 1 Ω
      A30-2 (EPA2) - G50-25 (EPA2) Always Below 1 Ω
      A30-6 (VPA) or G50-28 (VPA) - Body ground and other terminals Always 10 kΩ or higher
      A30-5 (EPA) or G50-22 (EPA) - Body ground and other terminals Always 10 kΩ or higher
      A30-3 (VPA2) or G50-31 (VPA2) - Body ground and other terminals Always 10 kΩ or higher
      A30-2 (EPA2) or G50-25 (EPA2) - Body ground and other terminals Always 10 kΩ or higher

    4. Reconnect the accelerator pedal sensor assembly connector.

    5. Reconnect the ECM connector.

      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 8 Click here

    OK

  6. CHECK ECM (CHECK RESISTANCE)


    1. Disconnect the accelerator pedal sensor assembly connector.

    2. B003RR1C41
      *a

      Component with harness connectedv

      (ECM)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G50-29 (VCPA) - G50-28 (VPA) Ignition switch off No short or no open circuit
      G50-28 (VPA) - G50-22 (EPA) Ignition switch off No short or no open circuit
      G50-30 (VCP2) - G50-31 (VPA2) Ignition switch off No short or no open circuit
      G50-31 (VPA2) - G50-25 (EPA2) Ignition switch off No short or no open circuit

    3. Reconnect the accelerator pedal sensor assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 10 Click here

    OK

  7. REPLACE ACCELERATOR PEDAL SENSOR ASSEMBLY


    1. Replace the accelerator pedal sensor assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 9 Click here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

  9. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    3. Turn the ignition switch off and leave the vehicle for 30 seconds.

    4. Turn the ignition switch to ON.

    5. 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.

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

    7. Confirm that the DTC is not output again.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END

  10. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 9 Click here