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 from the engine-ECU connector terminal MAP5 and earthed to the engine-ECU connector terminal MAPE from the manifold absolute pressure sensor connector terminal.
  • The sensor signal is inputted to the engine-ECU connector terminal MAP from the manifold absolute pressure sensor output terminal.

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


Check Conditions
  • Battery positive voltage is 8 - 16 V
  • 2 seconds later after the ignition switch has been in "ON" position or the engine has started up
Judgment Criterion
  • The manifold absolute pressure sensor output voltage 0.28 V or less.

FAIL-SAFE AND BACKUP FUNCTION



  • The pressure in the inlet manifold is controlled to be 100 kPa.
  • The EGR control is stopped (fully closed).
  • The fuel injection amount is restricted (Output restriction).
  • The turbocharger control is prohibited.
  • The open angle of the accelerator pedal is restricted.
  • The DPF regeneration is prohibited.
  • The throttle valve is opened (Electrical discontinuity).
  • The AS&G control is prohibited.

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

DIAGNOSTIC PROCEDURE

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

  • Refer to Data List Reference Table .

  1. Item 6: 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. Perform voltage measurement at manifold absolute pressure sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal engine-ECU MAP5 line and body earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?
Go to Step 6.
Go to Step 3.

STEP 3. Perform voltage measurement at engine-ECU connector.

  • Disconnect engine-ECU harness, and connect special tool power plant ECU check harness (MB992291) to measure at connector for inspection.
  • Ignition switch: ON
  • Voltage between terminal MAP5 and body earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

    Repair or replace the connector, or check and repair harness between manifold absolute pressure sensor connector terminal and engine-ECU connector terminal MAP5.

    • Check power supply line for open circuit and damage.
Go to Step 4.

STEP 4. Check harness between manifold absolute pressure sensor connector terminal and engine-ECU connector terminal MAP5.

  • Check power supply line for short circuit.

Q. Is the check result normal?
Go to Step 5.
Repair or replace the connector, or repair the damaged harness wire.

STEP 5. M.U.T.-III data list

  • Refer to Data List Reference Table .

  1. Item 6: 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 6. Perform resistance measurement at manifold absolute pressure sensor connector.

  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Resistance between terminal engine-ECU MAPE line and body earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 8.
Go to Step 7.

STEP 7. Check harness between manifold absolute pressure sensor connector terminal and engine-ECU connector terminal MAPE.

  • Check earthing line for damage.

Q. Is the check result normal?
Go to Step 5.
Repair or replace the connector, or repair the damaged harness wire.

STEP 8. Perform voltage measurement at manifold absolute pressure sensor connector.

  • Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
  • Ignition switch: ON
  • Voltage between terminal engine-ECU MAP line and body earth.
OK: 0.7 - 1.2 V

Q. Is the check result normal?
Go to Step 10.
Go to Step 9.

STEP 9. Check harness between manifold absolute pressure sensor connector terminal and engine-ECU connector terminal MAP.

  • Check output line for short circuit.

Q. Is the check result normal?
Replace the manifold absolute pressure sensor.
Repair or replace the connector, or repair the damaged harness wire.

STEP 10. Perform voltage measurement at engine-ECU connector.

  • Disconnect engine-ECU harness, and connect special tool power plant ECU check harness (MB992291) to measure at connector for inspection.
  • Ignition switch: ON
  • Voltage between terminal MAP and body earth.
OK: 0.7 - 1.2 V

Q. Is the check result normal?
Go to Step 5.

    Repair or replace the connector, or check and repair harness between manifold absolute pressure sensor connector terminal and engine-ECU connector terminal MAP.

    • Check output line for open circuit and damage.