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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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- 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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- Use special tool test harness (MB991709) to connect connector, and measure
at pick-up harness.
- Ignition switch: ON
- Voltage between terminal engine-ECU MAP5 line and body earth.
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Q.
Is the check result normal?
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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 damage.
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- Use special tool harness (MB991709) to connect connector, and measure at
pick-up harness.
- Ignition switch: ON
- Voltage between terminal engine-ECU MAPE line and body earth.
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Q.
Is the check result normal?
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Repair or replace the connector, or check
and repair harness between manifold absolute pressure sensor connector terminal and engine-ECU connector
terminal MAPE.
- Check earthing line for damage.
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- Use special tool harness (MB991709) to connect connector, and measure at
pick-up harness.
- Ignition switch: ON
- Voltage between terminal engine-ECU MAP line and body earth.
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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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Replace the manifold absolute pressure sensor.
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- Measure engine-ECU terminal voltage.
- Ignition switch: ON
- Voltage between terminal MAP and body earth.
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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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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 damage.
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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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- 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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Replace the EGR pipe (A, B).
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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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Replace the EGR cooler by-pass valve.
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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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