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ECD SYSTEM, Diagnostic DTC:19 (1)

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DTC Code DTC Name
19 (1) Accelerator Position Sensor Circuit Malfunction
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DESCRIPTION

Tip:

  • This is a troubleshooting 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 to detect the position of the accelerator pedal. Since this sensor is electronically controlled with hall elements, accurate control and reliability can be obtained. It has 2 sensors in order to detect the accelerator position and malfunctions of the accelerator position sensor.

Due to the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the ECM changes between 0 V and 5 V according to the position of the accelerator pedal. VPA is a signal which indicates the actual accelerator pedal position and is used for engine control, and VPA2 is a signal which indicates information about the position and is used for detecting malfunctions. Based on the signals input to terminals VPA and VPA2, the ECM determines the current position of the accelerator pedal and controls the injection pump.

DTC No. DTC Detection Condition Trouble Area
19 (1)

Condition (a), (b), (c) or (d) continues for 2.0 seconds:

(a) VPA is 0.2 V or less and VPA2 is 0.5 V or less.

(b) VPA is 4.8 V or higher.

(c) VPA is 0.2 V or higher and 3.45 V or less, and VPA2 is 4.8 V or higher.

(d) "VPA minus VPA2" is 0.02 V or less.

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor

  • ECM

Condition (a) continues for 0.5 seconds:

(a) VPA is 0.2 V or less, or VPA2 is 0.5 V or less.
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

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.

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When using intelligent tester:

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION)


    1. A01DT6HE37

      Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

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

    4. Check that the value displayed on the intelligent tester changes when repeatedly depressing and releasing the accelerator pedal.

      OK
      Value changes.
      Table 1. Text in Illustration
      *a Depressed
      *b Released

  2. Click here

    READ OUTPUT DTC (CHECK IF ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN)


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTC (Click here).

    3. Turn the ignition switch off for 30 seconds or more.

    4. Start the engine and idle it for 15 seconds or more.

    5. Read the DTCs (Click here).

      Table 2. Result
      Result Proceed to
      DTC 19 (1) output again A
      No DTC output B

  3. Click here

    REPLACE ECMClick here

  4. Click here

    SYSTEM OK

  5. Click here

    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
      A19-1 (VCP2) - C102-1 (VC) Always Below 1 Ω
      A19-2 (EPA2) - C102-9 (E2) Always Below 1 Ω
      A19-3 (VPA2) - G62-12 (VPA2) Always Below 1 Ω
      A19-4 (VCPA) - G62-6 (VCPA) Always Below 1 Ω
      A19-5 (EPA) - G62-4 (EPA) Always Below 1 Ω
      A19-6 (VPA) - G62-5 (VPA) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A19-1 (VCP2) or C102-1 (VC) - Body ground Always 10 kΩ or higher
      A19-2 (EPA2) or C102-9 (E2) - Body ground Always 10 kΩ or higher
      A19-3 (VPA2) or G62-12 (VPA2) - Body ground Always 10 kΩ or higher
      A19-4 (VCPA) or G62-6 (VCPA) - Body ground Always 10 kΩ or higher
      A19-5 (EPA) or G62-4 (EPA) - Body ground Always 10 kΩ or higher
      A19-6 (VPA) or G62-5 (VPA) - Body ground Always 10 kΩ or higher

    4. Reconnect the accelerator pedal position sensor connector.

    5. Reconnect the ECM connector.


  6. Click here

    CHECK ECM (VC, VCPA VOLTAGE)


    1. A01DPJHE06

      Disconnect the accelerator pedal position sensor connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C102-1 (VC) - C102-9 (E2) Ignition switch ON 4.5 to 5.5 V
      G62-6 (VCPA) - G62-4 (EPA) Ignition switch ON 4.5 to 5.5 V
      Table 3. Text in Illustration
      *1 Accelerator pedal position sensor connector
      *a

      Component with harness connected

      (ECM)

    4. Reconnect the accelerator pedal position sensor connector.


  7. Click here

    REPLACE ACCELERATOR PEDAL ROD ASSEMBLY


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


  8. Click here

    READ OUTPUT DTC (CHECK IF ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN)


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTC (Click here).

    3. Turn the ignition switch off for 30 seconds or more.

    4. Start the engine and idle it for 15 seconds or more.

    5. Read the DTCs (Click here).

      Table 4. Result
      Result Proceed to
      DTC 19 (1) output again A
      No DTC output B

  9. Click here

    REPLACE ECMClick here

  10. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. Click here

    REPLACE ECMClick here

  12. Click here

    SYSTEM OK

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When not using intelligent tester:

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PROCEDURE


  1. Click here

    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
      A19-1 (VCP2) - C102-1 (VC) Always Below 1 Ω
      A19-2 (EPA2) - C102-9 (E2) Always Below 1 Ω
      A19-3 (VPA2) - G62-12 (VPA2) Always Below 1 Ω
      A19-4 (VCPA) - G62-6 (VCPA) Always Below 1 Ω
      A19-5 (EPA) - G62-4 (EPA) Always Below 1 Ω
      A19-6 (VPA) - G62-5 (VPA) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A19-1 (VCP2) or C102-1 (VC) - Body ground Always 10 kΩ or higher
      A19-2 (EPA2) or C102-9 (E2) - Body ground Always 10 kΩ or higher
      A19-3 (VPA2) or G62-12 (VPA2) - Body ground Always 10 kΩ or higher
      A19-4 (VCPA) or G62-6 (VCPA) - Body ground Always 10 kΩ or higher
      A19-5 (EPA) or G62-4 (EPA) - Body ground Always 10 kΩ or higher
      A19-6 (VPA) or G62-5 (VPA) - Body ground Always 10 kΩ or higher

    4. Reconnect the accelerator pedal position sensor connector.

    5. Reconnect the ECM connector.


  2. Click here

    CHECK ECM (VC, VCPA VOLTAGE)


    1. A01DPJHE06

      Disconnect the accelerator pedal position sensor connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      C102-1 (VC) - C102-9 (E2) Ignition switch ON 4.5 to 5.5 V
      G62-6 (VCPA) - G62-4 (EPA) Ignition switch ON 4.5 to 5.5 V
      Table 5. Text in Illustration
      *1 Accelerator pedal position sensor connector
      *a

      Component with harness connected

      (ECM)

    4. Reconnect the accelerator pedal position sensor connector.


  3. Click here

    REPLACE ACCELERATOR PEDAL ROD ASSEMBLY


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


  4. Click here

    READ OUTPUT DTC (CHECK IF ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN)


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTC (Click here).

    3. Turn the ignition switch off for 30 seconds or more.

    4. Start the engine and idle it for 15 seconds or more.

    5. Read the DTCs (Click here).

      Table 6. Result
      Result Proceed to
      DTC 19 (1) output again A
      No DTC output B

  5. Click here

    REPLACE ECMClick here

  6. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    REPLACE ECMClick here

  8. Click here

    SYSTEM OK