ECD SYSTEM(w/o DPF), 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 pedal 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 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.

A01X634E09
P2120
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON


  • Accelerator pedal fully closed for 3 seconds

  • Accelerator pedal open partway for 3 seconds

  • Accelerator pedal fully open for 3 seconds

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

(a) VPA is less than 0.4 V and VPA2 is more than 0.97 deg, or VPA is more than 4.8 V.

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2122
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON


  • Accelerator pedal fully closed for 3 seconds

  • Accelerator pedal open partway for 3 seconds

  • Accelerator pedal fully open for 3 seconds

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

(a) VPA is less than 0.4 V.

(b) VPA2 is more than 0.97 deg.

  • Accelerator pedal position sensor

  • Open in VCPA circuit

  • VPA circuit open or ground short

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2123
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON


  • Accelerator pedal fully closed for 3 seconds

  • Accelerator pedal open partway for 3 seconds

  • Accelerator pedal fully open for 3 seconds

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

(a) VPA is more than 4.8 V.

  • Accelerator pedal position sensor

  • Open in EPA circuit

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2125
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON


  • Accelerator pedal fully closed for 3 seconds

  • Accelerator pedal open partway for 3 seconds

  • Accelerator pedal fully open for 3 seconds

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

(a) VPA2 is less than 1.2 V and VPA is more than 2.7 deg, or VPA2 is more than 4.8 V and VPA is more than 0.4 V but less than 3.45 V.

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2127
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON


  • Accelerator pedal fully closed for 3 seconds

  • Accelerator pedal open partway for 3 seconds

  • Accelerator pedal fully open for 3 seconds

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

(a) VPA2 is less than 1.2 V.

(b) VPA2 is more than 2.7 deg.

  • Accelerator pedal position sensor

  • Open in VCP2 circuit

  • VPA2 circuit open or ground short

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2128
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON


  • Accelerator pedal fully closed for 3 seconds

  • Accelerator pedal open partway for 3 seconds

  • Accelerator pedal fully open for 3 seconds

Conditions (a) and (b) continue for 2.0 seconds (1 trip detection logic):

(a) VPA2 is more than 4.8 V.

(b) VPA is more than 0.4 V but less than 3.45 V.

  • Accelerator pedal position sensor

  • Open in EPA2 circuit

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2138
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON


  • Accelerator pedal fully closed for 3 seconds

  • Accelerator pedal open partway for 3 seconds

  • Accelerator pedal fully open for 3 seconds

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

(a) The difference between VPA and VPA2 is less than 0.02 V.

(b) VPA is less than 0.4 V and VPA2 is less than 1.2 V.

  • VPA and VPA2 circuits are short-circuited

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
Related Data List
DTC No. Data List
P2120

  • Accel Sens. No.1 Volt %

  • Accel Sens. No.2 Volt %

  • Accel Sensor Out No.1

  • Accel Sensor Out No.2
P2122
P2123
P2125
P2127
P2128
P2138

Tech Tips

When DTC P2120, P2122, P2123, P2125, P2127, P2128 and/or P2138 is stored, check the output voltage of the accelerator pedal position sensor by entering the following menus: Powertrain / Engine / Data List / Accel Sensor Out No.1 and Accel Sensor Out No.2.

Trouble Area Accelerator Pedal Position Expressed as Voltage Output
Accelerator Pedal Released Accelerator Pedal Depressed
Accel Sensor Out No.1 Accel Sensor Out No.2 Accel Sensor Out No.1 Accel Sensor Out No.2
VC circuit open 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V
VPA circuit open or ground short 0 to 0.2 V 1.2 to 2.0 V 0 to 0.2 V 3.4 to 5.0 V
VPA2 circuit open or ground short 0.5 to 1.1 V 0 to 0.2 V 2.9 to 3.6 V 0 to 0.2 V
EPA circuit open 4.5 to 5.0 V 4.5 to 5.0 V 4.5 to 5.0 V 4.5 to 5.0 V

WIRING DIAGRAM

A01XAXTE49

CAUTION / NOTICE / HINT

Note

After replacing the ECM, the new ECM needs registration (See page ) 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 (ACCELERATOR PEDAL POSITION)


    1. A01X780E02
      *1 Accelerator Pedal
      *2 Depressed
      *3 Released

      Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to 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%
      Result
      Result Proceed to
      NG A
      OK B

    B

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    A

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


    1. Disconnect the accelerator pedal position sensor connector.

      A01WZKZE01

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      for LHD
      Tester Connection Condition Specified Condition
      A31-1 (VCP2) - A38-56 (VCP2) Always Below 1 Ω
      A31-2 (EPA2) - A38-58 (EPA2) Always Below 1 Ω
      A31-3 (VPA2) - A38-54 (VPA2) Always Below 1 Ω
      A31-4 (VCPA) - A38-55 (VCPA) Always Below 1 Ω
      A31-5 (EPA) - A38-57 (EPA) Always Below 1 Ω
      A31-6 (VPA) - A38-53 (VPA) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A31-1 (VCP2) - A52-56 (VCP2) Always Below 1 Ω
      A31-2 (EPA2) - A52-58 (EPA2) Always Below 1 Ω
      A31-3 (VPA2) - A52-54 (VPA2) Always Below 1 Ω
      A31-4 (VCPA) - A52-55 (VCPA) Always Below 1 Ω
      A31-5 (EPA) - A52-57 (EPA) Always Below 1 Ω
      A31-6 (VPA) - A52-53 (VPA) Always Below 1 Ω
      Standard Resistance (Check for Short)
      for LHD
      Tester Connection Condition Specified Condition
      A31-1 (VCP2) or A38-56 (VCP2) - Body ground Always 10 kΩ or higher
      A31-2 (EPA2) or A38-58 (EPA2) - Body ground Always 10 kΩ or higher
      A31-3 (VPA2) or A38-54 (VPA2) - Body ground Always 10 kΩ or higher
      A31-4 (VCPA) or A38-55 (VCPA) - Body ground Always 10 kΩ or higher
      A31-5 (EPA) or A38-57 (EPA) - Body ground Always 10 kΩ or higher
      A31-6 (VPA) or A38-53 (VPA) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A31-1 (VCP2) or A52-56 (VCP2) - Body ground Always 10 kΩ or higher
      A31-2 (EPA2) or A52-58 (EPA2) - Body ground Always 10 kΩ or higher
      A31-3 (VPA2) or A52-54 (VPA2) - Body ground Always 10 kΩ or higher
      A31-4 (VCPA) or A52-55 (VCPA) - Body ground Always 10 kΩ or higher
      A31-5 (EPA) or A52-57 (EPA) - Body ground Always 10 kΩ or higher
      A31-6 (VPA) or A52-53 (VPA) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

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


    1. A01X3F6E01
      *1 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
      A31-4 (VCPA) - A31-5 (EPA) Ignition switch ON 4.5 to 5.5 V
      A31-1 (VCP2) - A31-2 (EPA2) Ignition switch ON 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

  4. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY


    1. Replace the accelerator pedal rod assembly Click here.


    NEXT

  5. CHECK IF OUTPUT DTC RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTC Click here.

    3. Turn the ignition switch off.

    4. Turn the ignition switch to ON.

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

    6. Read the DTCs.

      Result
      Result Proceed to
      P2120, P2122, P2123, P2125, P2127, P2128 and/or P2138 are output again A
      No 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


    NEXT

  8. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

    3. Turn the ignition switch off.

    4. Turn the ignition switch off and leave the vehicle for 15 seconds.

    5. Turn the ignition switch to ON.

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

    7. Confirm that the DTC is not output again.

      Tech Tips

      Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

      2. Input DTC P2120, P2122, P2123, P2125, P2127, P2128 and/or P2138.

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, idle the engine.


    NEXT

    END