Code No. P0107: Manifold Absolute Pressure Sensor Circuit Low Input










OPERATION



  • A power voltage of 5 V is applied to the manifold absolute pressure sensor power terminal (terminal No. 3) from the engine-ECU (terminal No. 44) and earthed to the engine-ECU (terminal No. 46) from the manifold absolute pressure sensor (terminal No. 2).
  • The sensor signal is inputted to the engine-ECU (terminal No. 45) from the manifold absolute pressure sensor output terminal (terminal No. 1).

FUNCTION



  • The manifold absolute pressure sensor detects a change in inlet manifold pressure and inputs the signal to the engine-ECU.
  • In response to the signal, the engine-ECU corrects the fuel injection amount, etc.

TROUBLE JUDGMENT


Check Conditions
  • 8 minutes or more have passed since the engine starting sequence was completed, when the engine coolant temperature at engine start is 0°C or lower.
  • Volumetric efficiency is higher than 20 %.
Judgment Criterion
  • Manifold absolute pressure sensor output voltage is lower than 0.2 V [corresponding to a manifold absolute pressure of 5 kPa or lower] for 2 seconds.

PROBABLE CAUSES



  • Failed manifold absolute pressure sensor
  • Open/short circuit or harness damage in manifold absolute pressure sensor circuit or loose connector contact

  • Failed engine-ECU

DIAGNOSIS PROCEDURE


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



  • Refer to Data List Reference Table .

  1. Item 08: 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: B-124 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 B-124 manifold absolute pressure sensor connector.



  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal No. 3 and earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

Go to Step 7 .
Go to Step 4 .

STEP 4. Connector check: B-29 engine-ECU connector


Q. Is the check result normal?

Go to Step 5 .
Repair or replace the connector.

STEP 5. Check harness between B-124 (terminal No. 3) manifold absolute pressure sensor connector and B-29 (terminal No. 44) engine-ECU connector.



  • Check power supply line for open/short circuit.

Q. Is the check result normal?

Go to Step 6 .
Repair the damaged harness wire.

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



  • Refer to Data List Reference Table .

  1. Item 08: 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.

STEP 7. Perform resistance measurement at B-124 manifold absolute pressure sensor connector.



  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 2 and earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?

Go to Step 10 .
Go to Step 8 .

STEP 8. Connector check: B-29 engine-ECU connector


Q. Is the check result normal?

Go to Step 9 .
Repair or replace the connector.

STEP 9. Check harness between B-124 (terminal No. 2) manifold absolute pressure sensor connector and B-29 (terminal No. 46) engine-ECU connector.



  • Check earthing line for damage.

Q. Is the check result normal?

Go to Step 6 .
Repair the damaged harness wire.

STEP 10. Connector check: B-29 engine-ECU connector


Q. Is the check result normal?

Go to Step 11 .
Repair or replace the connector.

STEP 11. Check harness between B-124 (terminal No. 3) manifold absolute pressure sensor connector and B-29 (terminal No. 44) engine-ECU connector.



  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 12 .
Repair the damaged harness wire.

STEP 12. Check harness between B-124 (terminal No. 1) manifold absolute pressure sensor connector and B-29 (terminal No. 45) engine-ECU connector.



  • Check output line for open/short circuit and damage.

Q. Is the check result normal?

Go to Step 13 .
Repair the damaged harness wire.

STEP 13. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.

Q. Is diagnosis code set?

Go to Step 14 .
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 14. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code after replacement of manifold absolute pressure sensor

Q. Is diagnosis code set?

Replace the engine-ECU.
Check end.