Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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7. Elimination of Fault Information Record
Fault information records in memory should be cleared after fault elimination. DTC can be cleared with ways as
follows:
When value of ECU frequency counter (Hz) becomes 0, fault information records in fault memory are all cleared
automatically.
In the case of “Fault memory zero clearing” command, fault information records can be cleared with the application
of fault diagnostic apparatus.
8. Fault Detection
After obtaining fault information records with means above, only suspicious positions for fault occurrence are known.
However, this does not mean faults have been detected. Therefore, cause for one fault may be damaged electrical
component (like sensor or actuator or ECU, etc), wire in open circuit, wire short to ground or battery positive pole and
even mechanical failure.
Faults are internal with their external expressions as various symptoms. When symptoms are detected, check fault
information record for existence with fault diagnostic apparatus or flash code first of all and then eliminate
corresponding faults. Finally, detect faults according to engine symptoms.
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