ECD SYSTEM, Diagnostic DTC:P2120, P2121, P2122, P2123, P2125, P2127, P2128, P2138

DTC Code DTC Name
P2120 Throttle / Pedal Position Sensor / Switch "D" Circuit
P2121 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance
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 non-contact type.

The accelerator pedal position sensor is mounted on the accelerator link 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 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 engine control, and the VPA2 is a signal to indicate the information about the opening angle which is used for detecting a malfunction.

The ECM judges the current opening angle of the accelerator pedal from these signals input from terminals VPA and VPA2, and the ECM controls the throttle motor based on these signals.

A01CHLSE01
P2120
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON


  • Accelerator pedal fully released for 3 seconds

  • Accelerator pedal depressed partway for 3 seconds

  • Accelerator pedal fully depressed for 3 seconds

Condition (a) continues for 1 second or more (1 trip detection logic):

(a) VPA less than 0.2 V and VPA2 greater than 2.7 deg, or VPA greater than 4.8 V

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor (built into accelerator link assembly)

  • ECM
P2121
DTC Detection Drive Pattern DTC Detection Condition Trouble Area

Ignition switch ON


  • Accelerator pedal fully released for 3 seconds

  • Accelerator pedal depressed partway for 3 seconds

  • Accelerator pedal fully depressed for 3 seconds

Condition (a) continues for 1 second or more (1 trip detection logic):

(a) Difference between VPA and VPA2 exceeds the threshold

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor (built into accelerator link assembly)

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

Ignition switch ON


  • Accelerator pedal fully released for 3 seconds

  • Accelerator pedal depressed partway for 3 seconds

  • Accelerator pedal fully depressed for 3 seconds

Conditions (a) and (b) continue for 1 second or more (1 trip detection logic):

(a) VPA less than 0.2 V

(b) VPA2 greater than 2.7 deg

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor (built into accelerator link assembly)

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

Ignition switch ON


  • Accelerator pedal fully released for 3 seconds

  • Accelerator pedal depressed partway for 3 seconds

  • Accelerator pedal fully depressed for 3 seconds

Condition (a) continues for 2 seconds or more (1 trip detection logic):

(a) VPA greater than 4.8 V

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor (built into accelerator link assembly)

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

Ignition switch ON


  • Accelerator pedal fully released for 3 seconds

  • Accelerator pedal depressed partway for 3 seconds

  • Accelerator pedal fully depressed for 3 seconds

Condition (a) continues for 1 second or more (1 trip detection logic):

(a) VPA2 less than 0.5 V and VPA greater than 2.7 deg, or VPA2 greater than 4.8 V and VPA greater than 0.2 V but less than 3.45 V

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor (built into accelerator link assembly)

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

Ignition switch ON


  • Accelerator pedal fully released for 3 seconds

  • Accelerator pedal depressed partway for 3 seconds

  • Accelerator pedal fully depressed for 3 seconds

Conditions (a) and (b) continue for 1 second or more (1 trip detection logic):

(a) VPA2 less than 0.5 V

(b) VPA greater than 2.7 deg

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor (built into accelerator link assembly)

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

Ignition switch ON


  • Accelerator pedal fully released for 3 seconds

  • Accelerator pedal depressed partway for 3 seconds

  • Accelerator pedal fully depressed for 3 seconds

Conditions (a) and (b) continue for 2 seconds or more (1 trip detection logic):

(a) VPA2 greater than 4.8 V

(b) VPA greater than 0.2 V but less than 3.45 V

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor (built into accelerator link assembly)

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

Ignition switch ON


  • Accelerator pedal fully released for 3 seconds

  • Accelerator pedal depressed partway for 3 seconds

  • Accelerator pedal fully depressed for 3 seconds

Condition (a) or (b) continues for 2 seconds or more (1 trip detection logic):

(a) Difference between VPA and VPA2 less than 0.02 V

(b) VPA less than 0.2 V and VPA2 less than 0.5 V

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor (built into accelerator link assembly)

  • ECM

WIRING DIAGRAM

A01CI7ZE04

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 be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION)


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. A01CJFNE07

      Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

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

    6. Read the value.

      Standard
      Accelerator Pedal Accel Sens. No. 1 Volt % Accel Sens. No. 2 Volt %
      Released 12 to 20% 28 to 36%
      Depressed 60 to 78% 72 to 92%

    NG

    CHECK HARNESS AND CONNECTOR (ECM - ACCELERATOR PEDAL POSITION SENSOR) Click here

    OK

    CHECK WHETHER DTC OUTPUT RECURS Click here

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


    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 (Check for Open)
      Tester Connection Condition Specified Condition
      A29-1 (VCP2) - E40-4 (VCP2) Always Below 1 Ω
      A29-2 (E2) - E40-3 (EPA2) Always Below 1 Ω
      A29-3 (VPA2) - E39-1 (VPA2) Always Below 1 Ω
      A29-4 (VCP1) - E40-6 (VCPA) Always Below 1 Ω
      A29-5 (E1) - E40-5 (EPA) Always Below 1 Ω
      A29-6 (VPA1) - E39-2 (VPA) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A29-1 (VCP2) or E40-4 (VCP2) - Body ground Always 10 kΩ or higher
      A29-2 (E2) or E40-3 (EPA2) - Body ground Always 10 kΩ or higher
      A29-3 (VPA2) or E39-1 (VPA2) - Body ground Always 10 kΩ or higher
      A29-4 (VCP1) or E40-6 (VCPA) - Body ground Always 10 kΩ or higher
      A29-5 (E1) or E40-5 (EPA) - Body ground Always 10 kΩ or higher
      A29-6 (VPA1) or E39-2 (VPA) - Body ground Always 10 kΩ or higher

    4. Reconnect the accelerator pedal position sensor.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - ACCELERATOR PEDAL POSITION SENSOR)

    OK

  3. CHECK ECM (VCPA AND VCP2 VOLTAGE)


    1. A01CIKSE08
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E40-6 (VCPA) - E40-5 (EPA) Ignition switch ON 4.5 to 5.5 V
      E40-4 (VCP2) - E40-3 (EPA2) Ignition switch ON 4.5 to 5.5 V

    3. Reconnect the accelerator pedal position sensor.


    NG

    REPLACE ECM Click here

    OK

  4. REPLACE ACCELERATOR LINK ASSEMBLY


    1. Replace the accelerator link assembly Click here.


    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

    5. Clear the DTCs Click here.

    6. Turn the ignition switch off.

    7. Turn the ignition switch to ON.

    8. Accelerator pedal fully released for 3 seconds.

    9. Accelerator pedal depressed partway for 3 seconds.

    10. Accelerator pedal fully depressed for 3 seconds.

    11. Enter the following menus: Powertrain / Engine and ECT / DTC.

    12. Read the DTCs.

      Result
      Result Proceed to
      DTC P2120, P2121, P2122, P2123, P2125, P2127, P2128 or P2138 is output A
      DTC is not output B

    B

    END

    A

    REPLACE ECM Click here