Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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34.
DTC U0167
In the case of the maximum fault reading, there are EEPROM errors/ICM
time-out communication failures.
Fault Description: They are mainly taken as integrity failures for ECU internal microprocessor, being applied in
determination of ECU programming procedure implementation. In the case of engine shutdown and ignition switch
connection, ECU carries out self-diagnosis. In the case of diagnosis failure, control module records operation
condition under diagnosis failure and stores this information in “Fault Record”, DTC occurs. During engine operation,
when there is deviation between ECU detected signals and standard signals, the fault will be stored and expressed as
DTC via internal communication module of ECU. In the case of external signal intrusion, this will lead to system
disorder and DTC occurs. When various faults occur at the same time under the same operation condition, there will
be multiple DTCs. For there is a process for ECU response to each fault, ECU response time will be longer in the case
of multiple simultaneous faults in existence. During response process, DTC may occur due to ECU internal
communication errors or hardware faults.
Diagnosis Hint: In the case of fault occurrence, relevant test can be carried out after ECU replacement for possible
fault cause may be too long ECU internal response time. Check ECU circuit to verify whether it is circuit failure that
leads to fault occurrence.
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