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Q.
Is any other diagnosis code than P1272 output?
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Inspection chart for diagnosis codes (Refer to ).
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Q.
Is the check result normal?
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Replace the fuel filter then replace the common rail assembly and fuel injection tubes.
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- Repeat, more than 3 times, the cycle turning on the ignition switch and leaving it for more than 20 seconds. Operate the fuel pump in the fuel tank. Check there is no air at all in the fuel pipe.
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Q.
Does the trouble symptom persist?
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Replace the common rail assembly and common tubes.
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- Check suction control valve itself (Refer to
).
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Q.
Is the check result normal?
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Replace the suction control valve. After replacing the suction control valve, learn the supply pump (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns <4N1> ).
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Q.
Is the check result normal?
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Repair the connector(s) or wiring harness then replace the common rail assembly and common tubes.
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Q.
Is the check result normal?
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Repair the connector(s) or wiring harness then replace the common rail assembly and fuel injection tubes.
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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)Connect the oscilloscope special patterns pickup to engine-ECU connector (SCV+ terminal) and body earth. OK: The waveform should show a pattern similar to the illustration of inspection procedure using an oscilloscope (Refer to ).
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Q.
Is the check result normal?
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- After replacing the common rail assembly and common tubes, re-check the trouble symptoms
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Q.
Does the trouble symptom persist?
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Replace the supply pump assembly. After replacing the supply pump, learn the supply pump (Refer to GROUP 00 - Precautions Before Service - What The Common Rail Engine Learns <4N1> ).
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