SFI SYSTEM (w/o Secondary Air Injection System), Diagnostic DTC:P2121/19

DTC Code DTC Name
P2121/19 Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance

DESCRIPTION

Tech Tips

This DTC is related to the accelerator pedal position sensor.

Refer to DTC P2120/19 Click here.

DTC No. DTC Detection Condition Trouble Area
P2121/19

Either of following conditions 1 or 2 met for 0.5 seconds


  • 1. Difference between VPA and VPA2 is less than 0.4 V, or more than 1.2 V. (learned value of accelerator off position)

  • 2. Difference between VPA and VPA2 is greater than or equal to the specified value.

  • Accelerator pedal position sensor circuit

  • Accelerator pedal position sensor

  • ECM

MONITOR DESCRIPTION

When the difference between the output voltages of VPA and VPA2 deviates from the standard, the ECM determines that the accelerator pedal position sensor is malfunctioning. The ECM turns on the MIL and stores the DTC.

FAIL-SAFE

The accelerator pedal position sensor has a main circuit and associated circuit. When one circuit is malfunctioning, the accelerator pedal position is calculated by the output of the other circuit. When both of the circuits are malfunctioning, it is interpreted that the accelerator pedal is released. As a result, throttle valve is closed and engine idles.

WIRING DIAGRAM

Refer to DTC P2120/19 Click here.

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

When using intelligent tester:

PROCEDURE


  1. READ DATA LIST (ACCELERATOR POSITION NO. 1, ACCELERATOR POSITION NO. 2)

    A01J3MUE10

    1. 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 and ECT / Data List / Accelerator Position No. 1 and Accelerator Position No. 2.

    4. Read the values.

      Standard voltage
      Accelerator Pedal Accelerator Position No. 1 Accelerator Position No. 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

    REPLACE ECM

    NG

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

    A01J3IXE02

    1. Disconnect the A22 accelerator pedal position sensor connector.

    2. Disconnect the E8 ECM connector.

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

      Standard resistance
      Tester Connection Specified Condition
      A22-6 (VPA) - E8-18 (VPA) Below 1 Ω
      A22-5 (EPA) - E8-20 (EPA) Below 1 Ω
      A22-4 (VCPA) - E8-26 (VCPA) Below 1 Ω
      A22-3 (VPA2) - E8-19 (VPA2) Below 1 Ω
      A22-2 (EPA2) - E8-21 (EPA2) Below 1 Ω
      A22-1 (VCP2) - E8-27 (VCP2) Below 1 Ω
      A22-6 (VPA) or E8-18 (VPA) - Body ground 10 kΩ or higher
      A22-5 (EPA) or E8-20 (EPA) - Body ground 10 kΩ or higher
      A22-4 (VCPA) or E8-26 (VCPA) - Body ground 10 kΩ or higher
      A22-3 (VPA2) or E8-19 (VPA2) - Body ground 10 kΩ or higher
      A22-2 (EPA2) or E8-21 (EPA2) - Body ground 10 kΩ or higher
      A22-1 (VCP2) or E8-27 (VCP2) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ACCELERATOR PEDAL ROD

When not using intelligent tester:

PROCEDURE


  1. CHECK ECM (VPA, VPA2 VOLTAGE)

    A01J4U2E96

    1. Turn the ignition switch ON.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Accelerator Pedal Condition Specified Condition
      E8-18 (VPA) - E8-20 (EPA) Released 0.5 to 1.1 V
      E8-18 (VPA) - E8-20 (EPA) Depressed 2.5 to 4.6 V
      E8-19 (VPA2) - E8-21 (EPA2) Released 1.5 to 2.9 V
      E8-19 (VPA2) - E8-21 (EPA2) Depressed 3.5 to 5.0 V

    OK

    REPLACE ECM

    NG

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

    A01J3IXE02

    1. Disconnect the A22 accelerator pedal position sensor connector.

    2. Disconnect the E8 ECM connector.

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

      Standard resistance
      Tester Connection Specified Condition
      A22-6 (VPA) - E8-18 (VPA) Below 1 Ω
      A22-5 (EPA) - E8-20 (EPA) Below 1 Ω
      A22-4 (VCPA) - E8-26 (VCPA) Below 1 Ω
      A22-3 (VPA2) - E8-19 (VPA2) Below 1 Ω
      A22-2 (EPA2) - E8-21 (EPA2) Below 1 Ω
      A22-1 (VCP2) - E8-27 (VCP2) Below 1 Ω
      A22-6 (VPA) or E8-18 (VPA) - Body ground 10 kΩ or higher
      A22-5 (EPA) or E8-20 (EPA) - Body ground 10 kΩ or higher
      A22-4 (VCPA) or E8-26 (VCPA) - Body ground 10 kΩ or higher
      A22-3 (VPA2) or E8-19 (VPA2) - Body ground 10 kΩ or higher
      A22-2 (EPA2) or E8-21 (EPA2) - Body ground 10 kΩ or higher
      A22-1 (VCP2) or E8-27 (VCP2) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ACCELERATOR PEDAL ROD