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.
- 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 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 JUDGEMENT
- Engine coolant temperature is more than 0°C at the engine starts.
or
Check Conditions
- More than 8 minutes have passed since the engine starting sequence was completed, when the engine coolant temperature at engine start is less than 0°C.
- Volumetric efficiency is more than 20 %.
Judgement Criterion
- Manifold absolute pressure is 5 kPa or lower for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
- Control as if the inlet manifold vacuum pressure is 101 kPa.
PROBABLE CAUSES
- Failed manifold absolute pressure sensor
- Open/short circuit or harness damage in manifold absolute pressure sensor circuit or loose connector contact
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STEP 1. M.U.T.-III data list
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- Data list reference table (Refer to
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- Item 8: Manifold absolute pressure sensor
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Q.
Is the check result normal?
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 Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
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 Go to Step 2.
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STEP 2. Voltage measurement at manifold absolute pressure sensor connector (MAP5 line).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(3)Check the voltage between the manifold absolute pressure sensor connector (MAP5 line) and body earth.
OK: 4.9 - 5.1 V
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 3.
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STEP 3. Check of short to earth, and open circuit in MAP5 line between manifold absolute pressure sensor connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the connector(s) or wiring harness.
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STEP 4. M.U.T.-III data list
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- Data list reference table (Refer to ).
- Item 8: Manifold absolute pressure sensor
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
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Replace the engine-ECU.
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STEP 5. Resistance measurement at manifold absolute pressure sensor connector (MAPE line).
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(1)Disconnect the connector, and measure at the wiring harness side.
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(2)Check the resistance between the manifold absolute pressure sensor connector (MAPE line) and body earth.
OK: Continuity (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 6.
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STEP 6. Check of harness damage in MAPE line between manifold absolute pressure sensor connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 4.
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Repair the connector(s) or wiring harness.
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STEP 7. Check of harness damage in MAP5 line between manifold absolute pressure sensor connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair the connector(s) or wiring harness.
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STEP 8. Check of short to earth, open circuit and damage in MAP line between manifold absolute pressure sensor connector and engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair the connector(s) or wiring harness.
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STEP 9. M.U.T.-III diagnosis code
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- Reconfirmation of diagnosis code.
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Q.
Is diagnosis code stored?
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Go to Step 10.
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
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STEP 10. Replace the manifold absolute pressure sensor
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- After replacing the manifold absolute pressure sensor, reconfirm whether the diagnosis code is stored.
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Q.
Is diagnosis code stored?
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Replace the engine-ECU.
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Check end.
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