SFI SYSTEM (w/ Electronic Throttle Control System), Diagnostic DTC:P2138

DTC Code DTC Name
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 a non-contact type.

The accelerator pedal position sensor is mounted on the accelerator pedal 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 the engine control, and the VPA2 is a signal to indicate the information about the opening angle which is used for detecting malfunctions. The ECM judges the current opening angle of the accelerator pedal using signals from terminals VPA and VPA2, and the ECM controls the throttle motor based on these signals.

A0137JWE35
DTC No. DTC Detection Condition Trouble Area
P2138 When the difference in output between accelerator pedal position sensors 1 and 2 is outside the threshold range (1 trip detection logic).

  • Accelerator pedal

  • Open or short in accelerator pedal position sensor circuit

Tech Tips

Detection for P2138 is performed when the ignition switch is ON or the engine is running.

WIRING DIAGRAM

A0136QAE02

INSPECTION PROCEDURE

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 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.

PROCEDURE


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


    1. A0137TOE01

      Disconnect 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
      B26-11 (VCPA) - A23-4 (VCPA) Always Below 1 Ω
      B26-9 (VPA) - A23-6 (VPA) Always Below 1 Ω
      B26-10 (EPA) - A23-5 (EPA) Always Below 1 Ω
      B26-19 (VCP2) - A23-1 (VCP2) Always Below 1 Ω
      B26-17 (VPA2) - A23-3 (VPA2) Always Below 1 Ω
      B26-18 (EPA2) - A23-2 (EPA2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B26-11 (VCPA) or 23-4 (VCPA) - Body ground Always 10 kΩ or higher
      B26-9 (VPA) or A23-6 (VPA) - Body ground Always 10 kΩ or higher
      B26-10 (EPA) or A23-5 (EPA) - Body ground Always 10 kΩ or higher
      B26-19 (VCP2) - A23-1 (VCP2) - Body ground Always 10 kΩ or higher
      B26-17 (VPA2) - A23-3 (VPA2) - Body ground Always 10 kΩ or higher
      B26-18 (EPA2) - A23-2 (EPA2) - Body ground Always 10 kΩ or higher

    4. Reconnect the accelerator pedal position sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE ACCELERATOR PEDAL


    1. Replace the accelerator pedal Click here.


    NEXT

    END