Code No. P0106: Manifold Absolute Pressure Sensor Range/Performance Problem
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.
- The following 3 conditions are formed:
- The engine cooling water temperature is from 80 to 115 °C.
- The intake air temperature is from -5 to 80 °C.
- The atmospheric pressure is from 76 to 120 kPa.
Judgement Criterion
- When an idle state and an engine rotation speed of 2,000 r/min continue for 3 seconds, manifold absolute pressure are read and the difference between them goes under 800 Pa for 5 seconds.
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
- Vacuum hose clogged between manifold absolute pressure sensor and inlet manifold
- Failed manifold absolute pressure sensor
- Manifold absolute pressure sensor circuit harness damage or loose connector contact.
- EGR cooler clogged.
- EGR pipe (A, B) clogged.
- EGR cooler by-pass valve clogged.
- 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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 Go to Step 7.
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 Go to Step 2.
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STEP 2. Check for vacuum hose for clogs between manifold absolute pressure sensor and inlet manifold.
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- Check whether the vacuum hose is clogged between the manifold absolute pressure sensor and the inlet manifold, which is caused by dirt and the hose folded. Also check the inside inlet manifold and the nipple that can be possibly contaminated with dirt.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair
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STEP 3. Voltage measurement at manifold absolute pressure sensor connector (MAP5 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 (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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Repair MAP5 line between manifold absolute pressure sensor connector and engine-ECU connector.
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STEP 4. Voltage measurement at manifold absolute pressure sensor connector (MAPE line).
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(1)Use special tool 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 (MAPE line) and body earth.
OK: 0.5 V or less
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Q.
Is the check result normal?
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Go to Step 5.
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Repair MAPE line between manifold absolute pressure sensor connector and engine-ECU connector.
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STEP 5. Voltage measurement at manifold absolute pressure sensor connector (MAP line).
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(1)Use special tool 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: The voltage should be 0.7 - 1.2 V. When the accelerator pedal is quickly depressed from the idling state, the voltage temporarily rises.
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Q.
Is the check result normal?
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Go to Step 6.
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Replace the manifold absolute pressure sensor.
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STEP 6. Perform voltage measurement at engine-ECU connector.
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(1)Disconnect engine-ECU connector, 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: The voltage should be 0.7 - 1.2 V. When the accelerator pedal is quickly depressed from the idling state, the voltage temporarily rises.
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Q.
Is the check result normal?
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Go to Step 7.
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Repair MAP line between manifold absolute pressure sensor connector and engine-ECU connector.
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STEP 7. Check on clogged EGR cooler.
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When checking the clogged EGR cooler, make a visual check or use an air blower.
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- Check whether the EGR cooler is being clogged or not.
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Q.
Is the check result normal?
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Go to Step 8.
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Replace the EGR cooler.
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STEP 8. Check on clogged EGR pipe (A, B).
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- Check whether the EGR pipe (A, B) is being clogged or not.
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Q.
Is the check result normal?
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Go to Step 9.
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Replace the EGR pipe (A, B).
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STEP 9. Check on clogged EGR cooler by-pass valve.
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- Check whether the EGR cooler by-pass valve is being clogged or not.
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Q.
Is the check result normal?
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Go to Step 10.
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Replace the EGR cooler by-pass valve.
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STEP 10. 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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