SFI SYSTEM, Diagnostic DTC:P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19, P2138/19

DTC Code DTC Name
P2120/19 Throttle / Pedal Position Sensor / Switch "D" Circuit
P2122/19 Throttle / Pedal Position Sensor / Switch "D" Circuit Low Input
P2123/19 Throttle / Pedal Position Sensor / Switch "D" Circuit High Input
P2125/19 Throttle / Pedal Position Sensor / Switch "E" Circuit
P2127/19 Throttle / Pedal Position Sensor / Switch "E" Circuit Low Input
P2128/19 Throttle / Pedal Position Sensor / Switch "E" Circuit High Input
P2138/19 Throttle / Pedal Position Sensor / Switch "D" / "E" Voltage Correlation

DESCRIPTION

Tech Tips


  • These DTCs are related to the accelerator pedal position sensor.

  • This Electronic Throttle Control System (ETCS) does not use a throttle cable.

  • This is the procedure for the accelerator pedal position sensor.

The Accelerator Pedal Position (APP) sensor is mounted in the accelerator pedal to detect the angle of the accelerator pedal. This sensor is electronically controlled and uses Hall-effect elements.

In the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the ECM changes between 0 V and 5 V in proportion to the angle of the accelerator pedal. VPA is a signal to indicate the actual accelerator pedal angle and is used for the engine control. VPA2 is used to detect malfunctions of the sensor itself.

The ECM monitors the accelerator pedal angle from the VPA and VPA2 signal outputs, and controls the throttle motor based on these signals.

A01DZFQE01
DTC No. DTC Detection Condition Suspected Area
P2120/19

VPA quickly fluctuates up and down beyond upper and lower malfunction thresholds for 0.5 seconds

(1 trip detection logic)

  • Accelerator pedal position sensor

  • ECM
P2122/19

Condition (a) continues for 0.5 seconds or more when accelerator pedal is fully released:

(1 trip detection logic)


  • (a) VPA is 0.4 V or less

  • Accelerator pedal position sensor

  • Open in VCP1 circuit

  • Open or ground short in VPA circuit

  • ECM
P2123/19

Condition (a) continues for 2.0 seconds or more:

(1 trip detection logic)


  • (a) VPA is 4.8 V or more

  • Accelerator pedal position sensor

  • Open in EPA circuit

  • ECM
P2125/19

Condition (a) continues for 0.5 seconds or more:

(1 trip detection logic)


  • (a) VPA2 quickly fluctuates up and down beyond upper and lower malfunction thresholds

  • Accelerator pedal position sensor

  • ECM
P2127/19

Condition (a) continues for 0.5 seconds or more when accelerator pedal is fully released:

(1 trip detection logic)


  • (a) VPA2 is 1.2 V or less

  • Accelerator pedal position sensor

  • Open in VCP2 circuit

  • Open or ground short in VPA2 circuit

  • ECM
P2128/19

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

(1 trip detection logic)


  • (a) VPA2 is 4.8 V or more

  • (b) VPA is 0.4 V or more and VPA is 3.45 V or less

  • Accelerator pedal position sensor

  • Open in EPA2 circuit

  • ECM
P2138/19

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

(1 trip detection logic)


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

  • (b) VPA is 0.4 V or less and VPA2 is 1.2 V or less

  • VPA and VPA2 circuits are short-circuited

  • Accelerator pedal position sensor

  • ECM

Tech Tips

When one or more of DTCs P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 and P2138/19 are detected, check the output voltage of the accelerator pedal position sensor by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Accelerator Position No. 1 and Accelerator Position No. 2.

Suspected Area

Accel Position No. 1

When AP Released

Accel Position No. 2

When AP Released

Accel Position No. 1

When AP Depressed

Accel Position No. 2

When AP Depressed
VCP circuit open 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V 0 to 0.2 V
Open or ground short in VPA circuit 0 to 0.2 V 1.2 to 2.0 V 0 to 0.2 V 3.4 to 5.0 V
Open or ground short in VPA2 circuit 0.5 to 1.1 V 0 to 0.2 V 2.6 to 4.5 V 0 to 0.2 V
EPA circuit open 4.5 to 5.0 V 4.5 to 5.0 V 4.5 to 5.0 V 4.5 to 5.0 V

Tech Tips


  • The accelerator pedal position is expressed in terms of voltage.

  • AP stands for accelerator pedal.

MONITOR DESCRIPTION

When either voltage output VPA or VPA2 deviates from the standard range, or the difference between the voltage outputs of the two sensors is less than the threshold, the ECM concludes that there is a defect in the APP sensor. The ECM illuminates the MIL and sets a DTC.

Example:

The voltage output of the VPA is below 0.4 V or exceeds 4.8 V.

This monitor runs for 2 seconds (the first 2 seconds of engine idle) after the engine is started (1 trip detection logic).

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, the throttle valve is closed and the engine idles.

WIRING DIAGRAM

A01DX00E04

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

    CHECK IF DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS) Click here

    NG

  2. CHECK ECM (VCPA, VCP2 VOLTAGE)

    A01DYCSE18

    1. Turn the ignition switch ON.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Specified Condition
      E9-26 (VCPA) - E9-20 (EPA) 4.5 to 5.0 V
      E9-27 (VCP2) - E9-21 (EPA2) 4.5 to 5.0 V

    NG

    REPLACE ECM

    OK

  3. 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

  4. 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

  5. REPLACE ACCELERATOR PEDAL ROD


    NEXT

  6. CHECK IF DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON and turn the intelligent tester ON.

    3. Clear the DTCs Click here.

    4. Start the engine.

    5. Idle the engine for 15 seconds or more.

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

    7. Read DTC Click here.

      Result
      Display (DTC Output) Proceed to
      One or more of P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 and P2138/19 A
      No output B

    B

    NORMAL

    A

    REPLACE ECM

When not using intelligent tester:

PROCEDURE


  1. CHECK ECM (VCPA, VCP2 VOLTAGE)

    A01DYCSE18

    1. Turn the ignition switch ON.

    2. Measure the voltage of the ECM connector.

      Standard voltage
      Tester Connection Specified Condition
      E9-26 (VCPA) - E9-20 (EPA) 4.5 to 5.0 V
      E9-27 (VCP2) - E9-21 (EPA2) 4.5 to 5.0 V

    NG

    REPLACE ECM

    OK

  2. 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

  3. 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

  4. REPLACE ACCELERATOR PEDAL ROD


    NEXT

  5. CHECK IF DTC OUTPUT RECURS (ACCELERATOR PEDAL POSITION SENSOR DTCS)


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Idle the engine for 15 seconds or more.

    4. Read DTC Click here.

      Result
      Display (DTC Output) Proceed to
      One or more of P2120/19, P2122/19, P2123/19, P2125/19, P2127/19, P2128/19 and P2138/19 A
      No output B

    B

    NORMAL

    A

    REPLACE ECM