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 JUDGEMENT
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
Judgement 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).
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
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STEP 1. M.U.T.-III data list
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- Refer to Data List Reference Table
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- Item 6: 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 6.
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Go to Step 3.
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STEP 3. Voltage measurement at engine-ECU connector (MAP5 terminal).
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(1)Disconnect engine-ECU harness, and connect special tool power plant ECU check harness (MB992291) to measure at connector for inspection.
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(3)Check the voltage between the engine-ECU connector (MAP5 terminal) and body earth.
OK: 4.9 - 5.1 V
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Q.
Is the check result normal?
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Repair MAP5 line between manifold absolute pressure sensor connector and engine-ECU connector.
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Go to Step 4.
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STEP 4. Check of short to earth in MAP5 line between engine-ECU connector and manifold absolute pressure sensor connector.
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Q.
Is the check result normal?
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Go to Step 5.
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Repair the connector(s) or wiring harness.
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STEP 5. M.U.T.-III data list
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- Refer to Data List Reference Table .
- Item 6: 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 6. 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)Measure 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 8.
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Go to Step 7.
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STEP 7. Check of open circuit and 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 5.
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Repair the connector(s) or wiring harness.
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STEP 8. Voltage measurement at manifold absolute pressure sensor connector (MAP line).
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(1)Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
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(3)Check the voltage between the manifold absolute pressure sensor connector (MAP line) and body earth.
OK: 0.7 - 1.2 V
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 9.
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STEP 9. Check of short to earth in MAP line between engine-ECU connector and manifold absolute pressure sensor connector.
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Q.
Is the check result normal?
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Replace the manifold absolute pressure sensor.
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Repair the connector(s) or wiring harness.
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STEP 10. Voltage measurement at engine-ECU connector (MAP terminal).
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(1)Disconnect engine-ECU harness, and connect special tool power plant ECU check harness (MB992291) to measure at connector for inspection.
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(3)Check the voltage between the engine-ECU connector (MAP terminal) and body earth.
OK: 0.7 - 1.2 V
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Q.
Is the check result normal?
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Go to Step 5.
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Repair MAP line between manifold absolute pressure sensor connector and engine-ECU connector.
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