Code No. P0105: Manifold Absolute Pressure Sensor System




OPERATION



FUNCTION



TROUBLE JUDGMENT


Check Conditions
Judgment Criterion
or

PROBABLE CAUSES




DIAGNOSIS PROCEDURE

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

  • Refer to Data List Reference Table .

    1. Item No. 7: Manifold absolute pressure sensor

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2 .

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

Q. Is the check result normal?

Go to Step 3 .

Repair or replace the connector.

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.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

Go to Step 9 .

Go to Step 4 .

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.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

Go to Step 5 .

Go to Step 6 .

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


Q. Is the check result normal?


    Check and repair 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 open circuit.

Repair or replace the connector.

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

Q. Is the check result normal?

Go to Step 7 .

Repair or replace the connector.

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?

Go to Step 8 .

Repair the damaged harness wire.

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

  • Refer to Data List Reference Table .

    1. Item No. 7: Manifold absolute pressure sensor

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU then perform the variant coding (Refer to GROUP 00 - Precautions Before Service - How to Perform Variant Coding ).

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.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?

Go to Step 12 .

Go to Step 10 .

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



Q. Is the check result normal?

Go to Step 11 .

Repair or replace the connector.

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?

Go to Step 8 .

Repair the damaged harness wire.

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.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

Go to Step 14 .

Go to Step 13 .

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


Q. Is the check result normal?


    Check and repair 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 damage.

Repair or replace the connector.

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.
OK:
    Altitude 0m: 3.7 - 4.3 V
    Altitude 600m: 3.4 - 4.0 V
    Altitude 1,200m: 3.2 - 3.8 V
    Altitude 1,800m: 2.9 - 3.5 V

Q. Is the check result normal?

Go to Step 17 .

Go to Step 15 .

STEP 15. Connector check: A-08 engine-ECU connector



Q. Is the check result normal?

Go to Step 16 .

Repair or replace the connector.

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?

Replace the manifold absolute pressure sensor.

Repair the damaged harness wire.

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.
OK:
    Altitude 0m: 3.7 - 4.3 V
    Altitude 600m: 3.4 - 4.0 V
    Altitude 1,200m: 3.2 - 3.8 V
    Altitude 1,800m: 2.9 - 3.5 V

Q. Is the check result normal?

Go to Step 19 .

Go to Step 18 .

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


Q. Is the check result normal?


    Check and repair 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 open circuit and damage.

Repair or replace the connector.

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

Q. Is the check result normal?

Go to Step 8 .

Repair or replace the connector.