СИСТЕМА SFI, 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 Suspected Area
P2121/19

Conditions (a) and (b) continue for 0.5 seconds:


  • (a) Difference between VPA1 and VPA2 exceeds the threshold

  • (b) IDL is OFF

  • Accelerator pedal position sensor circuit

  • Accelerator pedal position sensor

  • ECM

MONITOR DESCRIPTION

When the difference between voltage outputs of VPA1 and VPA2 deviates from the standard range, the ECM concludes that there is a defect in the accelerator pedal position (APP) sensor. The ECM illuminates the MIL and sets a DTC.

This monitor runs for 1 second (the first second of engine idle) after the engine is started.

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)

    A01DZASE10

    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)

    A01E32FE05

    1. Disconnect the A13 accelerator pedal position sensor connector.

    2. Disconnect the E9 ECM connector.

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

      Standard resistance
      Tester Connection Specified Condition
      A13-6 (VPA) - E9-18 (VPA) Below 1 Ω
      A13-5 (EPA) - E9-20 (EPA) Below 1 Ω
      A13-4 (VCPA) - E9-26 (VCPA) Below 1 Ω
      A13-3 (VPA2) - E9-19 (VPA2) Below 1 Ω
      A13-2 (EPA2) - E9-21 (EPA2) Below 1 Ω
      A13-1 (VCP2) - E9-27 (VCP2) Below 1 Ω
      A13-6 (VPA) or E9-18 (VPA) - Body ground 10 kΩ or higher
      A13-5 (EPA) or E9-20 (EPA) - Body ground 10 kΩ or higher
      A13-4 (VCPA) or E9-26 (VCPA) - Body ground 10 kΩ or higher
      A13-3 (VPA2) or E9-19 (VPA2) - Body ground 10 kΩ or higher
      A13-2 (EPA2) or E9-21 (EPA2) - Body ground 10 kΩ or higher
      A13-1 (VCP2) or E9-27 (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)

    A01DYCSE19

    1. Turn the ignition switch ON.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Accelerator Pedal Condition Specified Condition
      E9-18 (VPA) - E9-20 (EPA) Released 0.5 to 1.1 V
      E9-18 (VPA) - E9-20 (EPA) Depressed 2.5 to 4.6 V
      E9-19 (VPA2) - E9-21 (EPA2) Released 1.5 to 2.9 V
      E9-19 (VPA2) - E9-21 (EPA2) Depressed 3.5 to 5.0 V

    OK

    REPLACE ECM

    NG

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

    A01E32FE05

    1. Disconnect the A13 accelerator pedal position sensor connector.

    2. Disconnect the E9 ECM connector.

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

      Standard resistance
      Tester Connection Specified Condition
      A13-6 (VPA) - E9-18 (VPA) Below 1 Ω
      A13-5 (EPA) - E9-20 (EPA) Below 1 Ω
      A13-4 (VCPA) - E9-26 (VCPA) Below 1 Ω
      A13-3 (VPA2) - E9-19 (VPA2) Below 1 Ω
      A13-2 (EPA2) - E9-21 (EPA2) Below 1 Ω
      A13-1 (VCP2) - E9-27 (VCP2) Below 1 Ω
      A13-6 (VPA) or E9-18 (VPA) - Body ground 10 kΩ or higher
      A13-5 (EPA) or E9-20 (EPA) - Body ground 10 kΩ or higher
      A13-4 (VCPA) or E9-26 (VCPA) - Body ground 10 kΩ or higher
      A13-3 (VPA2) or E9-19 (VPA2) - Body ground 10 kΩ or higher
      A13-2 (EPA2) or E9-21 (EPA2) - Body ground 10 kΩ or higher
      A13-1 (VCP2) or E9-27 (VCP2) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ACCELERATOR PEDAL ROD