Code No. P0108: Manifold Absolute Pressure Sensor Circuit High Input








OPERATION



  • A power voltage of 5 V is applied to the manifold absolute pressure sensor power terminal (terminal No. 3) from the engine-A/T-ECU (terminal No. 97) and earthed to the engine-A/T-ECU (terminal No. 96) from the manifold absolute pressure sensor (terminal No. 2).
  • The sensor signal is inputted to the engine-A/T-ECU (terminal No. 101) from the manifold absolute pressure sensor output terminal (terminal No. 1).

FUNCTION



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

TROUBLE JUDGMENT


Check Condition
  • 2 seconds later from when the ignition switch is in "ON" position or the engine starts
Judgment Criterion
  • The manifold absolute pressure sensor output voltage is more than 4.5 V (Barometric pressure of above 114 kPa or equivalent) for 2 seconds.

PROBABLE CAUSES



  • Failed manifold absolute pressure sensor
  • Open circuit in manifold absolute pressure sensor circuit or loose connector contact

  • Failed engine-A/T-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-05 manifold absolute pressure sensor connector

Q. Is the check result normal?
Go to Step 3 .
Repair or replace the connector.

STEP 3. Perform resistance measurement at B-05 manifold absolute pressure sensor connector.

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

Q. Is the check result normal?
Go to Step 7 .
Go to Step 4 .

STEP 4. Connector check: D-217 engine-A/T-ECU connector

Q. Is the check result normal?
Go to Step 5 .
Repair or replace the connector.

STEP 5. Check harness between B-05 (terminal No. 2) manifold absolute pressure sensor connector and D-217 (terminal No. 96) engine-A/T-ECU connector.
note Before checking harness, check intermediate connector D-111, and repair if necessary.

  • Check earthing line for open 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-A/T-ECU.

STEP 7. 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 manifold absolute pressure sensor.