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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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- Suction control valve connector check.
- Check suction control valve itself (Refer to On-vehicle Service - Suction Control Valve Check).
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Q.
Is the check result normal?
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Repair or replace the connector, or 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 ).
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- Check output line for open/short circuit and damage.
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Q.
Is the check result normal?
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Repair or replace the connector, or repair the damaged harness wire then replace the common rail assembly and common tubes.
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- Check output line for open/short circuit and damage.
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Q.
Is the check result normal?
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Repair or replace the connector, or repair the damaged harness wire then replace the common rail assembly and fuel injection tubes.
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- Engine: Idling
- Connect the oscilloscope special patterns pickup to engine-ECU terminal SCV+ and body earth.
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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 ).
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