P2124 – Accelerator Pedal Position Sensor (Main) Circuit High Input Intermittent MMC L200 IV



OPERATION

  • A power voltage of 5 V is applied to the accelerator pedal position sensor (terminal No. 1) from the engine-ECU (terminal No. 149).
  • The power voltage is earthed to the engine-ECU (terminal No. 151) from the accelerator pedal position sensor (terminal No. 2).
  • The sensor signal is inputted to the engine-ECU (terminal No. 150) from the accelerator pedal position sensor output terminal (terminal No. 3).

  • FUNCTION

  • The accelerator pedal position sensor (main) outputs voltage which corresponds to the accelerator pedal depression.
  • The engine-ECU checks whether the voltage is within a specified range.

  • TROUBLE JUDGMENT

  • Ignition switch is in “ON” position
  • Accelerator pedal position sensor (sub) is normal
  • Accelerator pedal position sensor (main) output voltage exceeds 4.8 V for 0.05 seconds.

  • PROBABLE CAUSES

  • Failed accelerator pedal position sensor
  • Open circuit in accelerator pedal position sensor circuit or loose connector contact
  • Failed engine-ECU

  • DIAGNOSIS PROCEDURE

    STEP 1. M.U.T.-III data list

  • Item 9: Accelerator pedal position sensor (main)
  • Q. Is the check result normal?

    STEP 2. Connector check: C-115 accelerator pedal position sensor connector

    Q. Is the check result normal?

    STEP 3. Perform resistance measurement at C-115 accelerator pedal position sensor connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 2 and earth.
  • Q. Is the check result normal?

    STEP 4. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

    STEP 5. Check harness between C-115 (terminal No. 2) accelerator pedal position sensor connector and C-103 (terminal No. 151) engine-ECU connector.

  • Check earthing line for open circuit.
  • Q. Is the check result normal?

    STEP 6. M.U.T.-III data list

  • Item 9: Accelerator pedal position sensor (main)
  • Q. Is the check result normal?

    STEP 7. Replace the accelerator pedal position sensor

  • After replacing the accelerator pedal position sensor, re-check the trouble symptoms.
  • Q. Is the check result normal?

    Author: admin