ECD SYSTEM (w/ EGR Cooler Bypass Valve), 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 procedures for the accelerator pedal position sensor.

  • This electrical throttle system does not use a throttle cable.

The accelerator pedal position sensor is mounted on the accelerator pedal and detects the opening angle of the accelerator pedal. It has 2 sensors to detect the accelerator position and malfunctions of the accelerator pedal position sensor.

In the accelerator pedal position sensor, the voltage applied to pedal terminals VPA1 and VPA2 of the ECM changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal. The VPA1 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 VPA1 and VPA2, and the ECM uses them as one of the conditions to control the injection volume and diesel throttle valve position.

A01KGT7E07
DTC No. DTC Detection Condition Trouble Area
P2120

Condition (a) continues for 0.5 seconds or more:

(a) (VPA1 is 0.4 V or less) or (VPA1 is 4.8 V or more)

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2122 VPA1 is 0.4 V or less for 0.5 seconds or more when VPA2 output indicates 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

Condition (a) continues for 2.0 seconds or more:

(a) VPA1 is 4.8 V or more

  • Accelerator pedal position sensor

  • Open in EPA circuit

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2125

Condition (a) continues for 0.5 seconds or more:

(a) (VPA2 is 1.2 V or less) or (VPA2 is 4.8 V or more)

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2127 VPA2 is 1.2 V or less for 0.5 seconds 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

Conditions (a) and (b) continue for 2.0 seconds or more:

(a) VPA2 is 4.8 V or more

(b) VPA1 is 0.4 V or more and VPA1 is 3.45 V or less

  • Accelerator pedal position sensor

  • Open in EPA2 circuit

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM
P2138

Condition (a) or (b) continues for 2.0 seconds or more:

(a) Difference between VPA1 and VPA2 is 0.02 V or less

(b) VPA1 is 0.4 V or less and VPA2 is 1.2 V or less

  • VPA1 and VPA2 circuits are short-circuited

  • Accelerator pedal position sensor

  • Accelerator pedal

  • Accelerator pedal rod (arm) deformed

  • ECM

Tech Tips

When DTC P2120, P2122, P2123, P2125, P2127, P2128 or P2138 is detected, check the output voltage of the accelerator pedal position sensor by selecting the following menu items on the intelligent tester: Powertrain / Engine and ECT / Data List / Accel Sens. No. 1 Volt % and Accel Sens. No. 2 Volt %.

WIRING DIAGRAM

A01KFHZE03

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. Freeze frame data records the engine condition when malfunctions are detected. 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.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (ACCELERATOR PEDAL POSITION)


    1. A01KHX3E08
      Text in Illustration
      *1 Accelerator Pedal
      *a Depressed
      *b Released

      Connect the intelligent tester to the DLC3.

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

    3. Select the following menus: Powertrain / Engine and ECT / Data List / Accel Sens. No.1 Volt % and Accel Sens. No.2 Volt %.

    4. Read values.

      Standard Voltage
      Accelerator Pedal Accel Sens. No.1 Volt % Accel Sens. No.2 Volt %
      Released 8 to 28% 51 to 86%
      Depressed 30 to 55% 73 to 98%
      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 A26 accelerator pedal position sensor connector.

    2. Disconnect the E16 and E17 ECM connectors.

    3. Measure the resistance according to the values in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A26-1 (VCP2) - E16-4 (VCP2) Always Below 1 Ω
      A26-2 (EP2) - E16-3 (EPA2) Always Below 1 Ω
      A26-3 (VPA2) - E17-1 (VPA2) Always Below 1 Ω
      A26-4 (VCPA) - E16-6 (VCPA) Always Below 1 Ω
      A26-5 (EPA) - E16-5 (EPA) Always Below 1 Ω
      A26-6 (VPA) - E17-2 (VPA) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A26-1 (VCP2) or E16-4 (VCP2) - Body ground Always 10 kΩ or higher
      A26-2 (EPA2) or E16-3 (EPA2) - Body ground Always 10 kΩ or higher
      A26-3 (VPA2) or E17-1 (VPA2) - Body ground Always 10 kΩ or higher
      A26-4 (VCPA) or E16-6 (VCPA) - Body ground Always 10 kΩ or higher
      A26-5 (EPA) or E16-5 (EPA) - Body ground Always 10 kΩ or higher
      A26-6 (VPA) or E17-2 (VPA) - Body ground Always 10 kΩ or higher

    4. Reconnect the accelerator pedal position sensor connector.

    5. Reconnect the ECM connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

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


    1. A01KGC0E03
      Text in Illustration
      *1 Accelerator Position Sensor Connector
      *a Wire Harness Side

      Disconnect the A26 accelerator pedal position sensor connector.

    2. Measure the voltage according to the values in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A26-4 (VCPA) - A26-5 (EPA) Ignition switch ON 4.5 to 5.5 V
      A26-1 (VCP2) - A26-2 (EPA2) Ignition switch ON 4.5 to 5.5 V

    3. Reconnect the accelerator pedal position sensor connector.


    NG

    REPLACE ECM Click here

    OK

  4. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY (ACCELERATOR LINK ASSEMBLY)


    1. Replace the accelerator pedal rod assembly (accelerator link assembly). Click here


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPLACE ECM


    1. Replace the ECM. Click here


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear DTCs. Click here

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

    4. Turn the ignition switch to ON.

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

    6. Confirm that the DTC is not output again.


    NEXT

    END