Posted in Mitsubishi Colt

P0105 – Manifold Absolute Pressure Sensor System MMC Colt

 Posted by  Posted on September 26, 2020

OPERATION

  • A power voltage of 5 V is applied to the manifold absolute pressure sensor power terminal (terminal No. 2) from the engine-ECU (terminal No. 32) and earthed to the engine-ECU (terminal No. 33) from the manifold absolute pressure sensor (terminal No. 4).
  • The sensor signal is inputted to the engine-ECU (terminal No. 17) from the manifold absolute pressure sensor output terminal (terminal No. 1).

    • FUNCTION

  • The manifold absolute pressure sensor converts the manifold absolute pressure into a voltage signal and inputs the signal to the engine-ECU.
  • In response to the signal, the engine-ECU corrects the fuel injection amount, etc.

    • TROUBLE JUDGMENT

  • 2 seconds later after the ignition switch has been in “ON” position or the engine has started up
  • The battery voltage is 8 V or more.
  • The sensor output voltage is 4.5 V or more (barometric pressure above 114 kPa or equivalent) for 4 seconds.
  • The sensor output voltage is 0.2 V or less (barometric pressure below 53 kPa or equivalent) for 4 seconds.

    • PROBABLE CAUSES

  • Failed manifold absolute pressure sensor
  • Open or shorted manifold absolute pressure sensor circuit, harness damage, or connector damage
  • Failed engine-ECU

    • DIAGNOSIS PROCEDURE

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

  • Item No. 7: Manifold absolute pressure sensor

    • Q. Is the check result normal?

    STEP 2. Connector check: A-119 manifold absolute pressure sensor connector

    Q. Is the check result normal?

    STEP 3. Perform voltage measurement at A-119 manifold absolute pressure sensor connector.

  • Disconnect and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 2 and earth.

    • Q. Is the check result normal?

    STEP 4. Perform voltage measurement at A-08 engine-ECU connector.

  • Disconnect engine-ECU connector, and connect special tool power plant ECU check harness (MB991987), and then measure the voltage on the check connector.
  • Ignition switch: ON
  • Voltage between terminal No. 32 and earth.

    • Q. Is the check result normal?

    STEP 5. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

  • Check power supply line for open circuit.

    • STEP 6. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

    STEP 7. Check harness between A-119 (terminal No. 2) manifold absolute pressure sensor connector and A-08 (terminal No. 32) engine-ECU connector.

  • Check power supply line for short circuit.

    • Q. Is the check result normal?

    STEP 8. M.U.T.-III data list

  • Item No. 7: Manifold absolute pressure sensor

    • Q. Is the check result normal?

    STEP 9. Perform resistance measurement at A-119 manifold absolute pressure sensor connector.

  • Disconnect and measure at harness side.
  • Resistance between terminal No. 4 and earth.

    • Q. Is the check result normal?

    STEP 10. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

    STEP 11. Check harness between A-119 (terminal No. 4) manifold absolute pressure sensor connector and A-08 (terminal No. 33) engine-ECU connector.

  • Check earthing line for open circuit and damage.

    • Q. Is the check result normal?

    STEP 12. Perform voltage measurement at A-119 manifold absolute pressure sensor connector.

  • Use special tool test harness (MB991348) to connect connector and measure at pick-up harness.
  • Ignition switch: ON
  • Voltage between terminal No. 2 and earth.

    • Q. Is the check result normal?

    STEP 13. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

  • Check power supply line for damage.

    • STEP 14. Perform voltage measurement at A-119 manifold absolute pressure sensor connector.

  • Use special tool test harness (MB991348) 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 15. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

    STEP 16. Check harness between A-119 (terminal No. 1) manifold absolute pressure sensor connector and A-08 (terminal No. 17) engine-ECU connector.

  • Check output line for short circuit and damage.

    • Q. Is the check result normal?

    STEP 17. Perform voltage measurement at A-08 engine-ECU connector.

  • Disconnect engine-ECU connector, and connect special tool power plant ECU check harness (MB991987), and then measure the voltage on the check connector.
  • Ignition switch: ON
  • Voltage between terminal No. 17 and earth.

    • Q. Is the check result normal?

    STEP 18. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

  • Check output line for open circuit and damage.

    • STEP 19. Connector check: A-08 engine-ECU connector

    Q. Is the check result normal?

    Author: admin