СИСТЕМА ECD, Diagnostic DTC:P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19, P2138/19

DTC Code DTC Name
P2120/19 Throttle / Pedal Position Sensor / Switch "D" Circuit
P2122/19 Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input
P2123/19 Throttle / Pedal Position Sensor / Switch "D" Circuit High Input
P2125/19 Throttle / Pedal Position Sensor / Switch "E" Circuit
P2127/19 Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input
P2128/19 Throttle / Pedal Position Sensor / Switch "E" Circuit High Input
P2138/19 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.

A01BC2RE01
DTC No.

DTC Detection Condition

(All of following are 1 trip detection logic)

 Trouble Area
P2120/19

  • Condition (a) continues for 0.5 sec. or more:


    1. VPA is 0.2 V or less

    2. VPA is 4.8 V or more

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2122/19 VPA is 0.2 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
P2123/19

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


    1. VPA is 4.8 V or more

  • Accelerator pedal position sensor

  • Open in EPA circuit

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2125/19

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


    1. VPA2 is 0.5 V or less

    2. VPA2 is 4.8 V or more

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2127/19 VPA2 is 0.5 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
P2128/19

  • Conditions (a) and (b) continue for 2.0 sec. or more:


    1. VPA2 is 4.8 V or more

    2. VPA is 0.2 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
P2138/19

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


    1. Difference between VPA and VPA2 is 0.02 V or less

    2. VPA is 0.2 V or less and VPA2 is 0.5 V or less

  • VPA and VPA2 circuit are short circuited

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM

Tech Tips

When DTC P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 or P2138/19 is detected, check the output voltage of the accelerator pedal position sensor by entering the following menus on the intelligent tester : Powertrain / Engine / Data List / Accel Position 1 and Accel Position 2.

- Accelerator pedal position expressed as voltage output Accelerator pedal position expressed as voltage output Accelerator pedal position expressed as voltage output Accelerator pedal position expressed as voltage output
- Accelerator pedal released Accelerator pedal released Accelerator pedal depressed Accelerator pedal depressed
Trouble Area Accelerator Position 1 Accelerator Position 2 Accelerator Position 1 Accelerator Position 2
VCP 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 1.4 to 1.8 V 0 to 0.2 V 3.7 to 5.0 V
VPA2 circuit open or ground short 0.6 to 1.0 V 0 to 0.2 V 2.9 to 4.2 V 0 to 0.2 V
EP 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

A01BCZ9E01

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. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

When using intelligent tester:

PROCEDURE


  1. READ VALUE USING ACCELERATOR PEDAL POSITION SENSOR


    1. A01BDFBE07

      Connect the intelligent tester to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine / Data List / Accel Position 1 and Accel Position 2.

    4. Read the values.

      Standard voltage
      Accelerator Pedal Accel Position 1 Accel Position 2
      Released 0.5 to 1.1 V 1.2 to 2.0 V
      Depressed 2.6 to 4.5 V 3.4 to 5.0 V

    OK

    CHECK IF OUTPUT DTC RECURS Click here

    NG

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


    1. A01BEU4E24

      Disconnect the B1 sensor connector.

    2. Disconnect the B9 ECM connector.

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

      Standard resistance
      Tester Connection Specified Condition
      B1-1 (VCP2) - B9-27 (VCP2) Below 1 Ω
      B1-2 (EPA2) - B9-29 (EPA2) Below 1 Ω
      B1-3 (VPA2) - B9-23 (VPA2) Below 1 Ω
      B1-4 (VCPA) - B9-26 (VCPA) Below 1 Ω
      B1-5 (EPA) - B9-28 (EPA) Below 1 Ω
      B1-6 (VPA) - B9-22 (VPA) Below 1 Ω
      B1-1 (VCP2) or B9-27 (VCP2) - Body ground 10 kΩ or higher
      B1-2 (EPA2) or B9-29 (EPA2) - Body ground 10 kΩ or higher
      B1-3 (VPA2) or B9-23 (VPA2) - Body ground 10 kΩ or higher
      B1-4 (VCPA) or B9-26 (VCPA) - Body ground 10 kΩ or higher
      B1-5 (EPA) or B9-28 (EPA) - Body ground 10 kΩ or higher
      B1-6 (VPA) or B9-22 (VPA) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

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


    1. A01BGG8E01

      Disconnect the B1 sensor connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Specified Condition
      B9-26 (VCPA) - B9-28 (EPA) 4.5 to 5.0 V
      B9-27 (VCP2) - B9-29 (EPA2) 4.5 to 5.0 V

    NG

    REPLACE ECM

    OK

  4. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY


    NEXT

  5. CHECK IF OUTPUT DTC RECURS


    1. Clear the DTC Click here.

    2. Start the engine.

    3. Drive the engine at idle for 15 seconds or more.

    4. Read the DTC Click here.

      Result
      Display (DTC output) Proceed to
      P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 or P2138/19 is output again A
      P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19orP2138/19 is not output B

    B

    END

    A

    REPLACE ECM

When not using intelligent tester:

PROCEDURE


  1. CHECK ECM TERMINAL VOLTAGE (VPA AND VPA2 TERMINALS)


    1. A01BF68E09

      Turn the ignition switch ON.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Condition Accelerator Pedal Condition Specified Condition
      B9-22 (VPA) - B9-28 (EPA) Released 0.5 to 1.1 V
      B9-22 (VPA) - B9-28 (EPA) Depressed 2.6 to 4.5 V
      B9-23 (VPA2) - B9-29 (EPA2) Released 1.2 to 2.0 V
      B9-23 (VPA2) - B9-29 (EPA2) Depressed 3.4 to 5.0 V

    OK

    REPLACE ECM

    NG

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


    1. A01BEU4E24

      Disconnect the B1 sensor connector.

    2. Disconnect the B9 ECM connector.

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

      Standard resistance
      Tester Connection Specified Condition
      B1-1 (VCP2) - B9-27 (VCP2) Below 1 Ω
      B1-2 (EPA2) - B9-29 (EPA2) Below 1 Ω
      B1-3 (VPA2) - B9-23 (VPA2) Below 1 Ω
      B1-4 (VCPA) - B9-26 (VCPA) Below 1 Ω
      B1-5 (EPA) - B9-28 (EPA) Below 1 Ω
      B1-6 (VPA) - B9-22 (VPA) Below 1 Ω
      B1-1 (VCP2) or B9-27 (VCP2) - Body ground 10 kΩ or higher
      B1-2 (EPA2) or B9-29 (EPA2) - Body ground 10 kΩ or higher
      B1-3 (VPA2) or B9-23 (VPA2) - Body ground 10 kΩ or higher
      B1-4 (VCPA) or B9-26 (VCPA) - Body ground 10 kΩ or higher
      B1-5 (EPA) or B9-28 (EPA) - Body ground 10 kΩ or higher
      B1-6 (VPA) or B9-22 (VPA) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

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


    1. A01BGG8E01

      Disconnect the B1 sensor connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Specified Condition

      B9-26 (VCPA) - B9-28 (EPA)

      B9-27 (VCP2) - B9-29 (EPA2)

      		 4.5 to 5.0 V

    NG

    REPLACE ECM

    OK

  4. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY


    NEXT

  5. CHECK IF OUTPUT DTC RECURS


    1. Clear the DTC Click here.

    2. Start the engine.

    3. Drive the engine at idle for 15 seconds or more.

    4. Read the DTC Click here.

      Result
      Display (DTC output) Proceed to
      P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 or P2138/19 is output again A
      P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19orP2138/19 is not output B

    B

    END

    A

    REPLACE ECM