P2138 – Accelerator Pedal Position Sensor (Main and Sub) Range-Performance Problem MMC L200 IV

FUNCTION

  • Engine-ECU checks the accelerator pedal position sensor output signal characteristics for abnormal conditions.

  • TROUBLE JUDGMENT

  • Ignition switch is in “ON” position.
  • When an error is detected on the High side of the accelerator pedal position (main) for 0.1 second, the accelerator pedal position sensor (sub) is faulty on the High/Low side.
  • Battery positive voltage is 6 – 16 V
  • 2 seconds later after the ignition switch has been in “ON” position or the engine has started up
  • Engine speed is 600 r/min or more.
  • Accelerator pedal position sensor (main) output voltage is 0.2 V or higher and 4.8 V or lower.
  • Accelerator pedal position sensor (sub) output voltage is 0.125 V or higher and 2.375 V or lower.
  • When a change in the accelerator pedal position sensor (sub) output voltage is less than the specified value for 0.2 second, the difference between the opening indicated by the accelerator pedal position sensor (main) and that by the accelerator pedal position sensor (sub) is 18 % or more of the specified value.

  • PROBABLE CAUSES

  • Failed accelerator pedal position sensor
  • Accelerator pedal position sensor circuit harness damage or loose connector contact
  • Failed engine-ECU

  • DIAGNOSIS PROCEDURE

    STEP 1. Connector check: C-115 accelerator pedal position connector

    Q. Is the check result normal?

    STEP 2. 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 3. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

  • Check earthing line for damage.
  • STEP 4. Perform resistance measurement at C-115 accelerator pedal position sensor connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 5 and earth.
  • Q. Is the check result normal?

    STEP 5. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

  • Check earthing line for damage.
  • STEP 6. Perform voltage measurement at C-115 accelerator pedal position sensor connector.

  • Use special tool test harness (MB991658) to connect connector, and measure at pick-up harness.
  • Ignition switch: ON
  • Voltage between terminal No. 1 and earth.
  • Q. Is the check result normal?

    STEP 7. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

  • Check power supply line for damage.
  • STEP 8. Perform voltage measurement at C-115 accelerator pedal position sensor connector.

  • Use special tool test harness (MB991658) to connect connector, and measure at pick-up harness.
  • Ignition switch: ON
  • Voltage between terminal No. 4 and earth.
  • Q. Is the check result normal?

    STEP 9. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

  • Check power supply line for damage.
  • STEP 10. Perform voltage measurement at C-103 engine-ECU connector.

  • Measure engine-ECU terminal voltage.
  • Ignition switch: ON
  • Voltage between terminal No. 150 and earth.
  • Q. Is the check result normal?

    STEP 11. Check harness between C-115 (terminal No. 3) accelerator pedal position sensor connector and C-103 (terminal No. 150) engine-ECU connector.

  • Check output line for damage.
  • Q. Is the check result normal?

    STEP 12. Perform voltage measurement at C-103 engine-ECU connector.

  • Measure engine-ECU terminal voltage.
  • Ignition switch: ON
  • Voltage between terminal No. 135 and earth.
  • Q. Is the check result normal?

    STEP 13. Check harness between C-115 (terminal No. 6) accelerator pedal position sensor connector and C-103 (terminal No. 135) engine-ECU connector.

  • Check output line for damage.
  • Q. Is the check result normal?

    STEP 14. Connector check: C-103 engine-ECU connector

    Q. Is the check result normal?

    STEP 15. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.
  • Q. Is the diagnosis code set?

    Author: admin