Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
170
21.
DTC P0650
There are faults (short circuit or open circuit) in ECU OBD malfunction
indicator lamp (MIL) output connecting wire.
P1619
Connection of ECU system MIL output connecting wire is short to high
level.
P161A Connection of ECU system MIL output connecting wire is short to ground.
P161B ECU system MIL output connecting wire is open.
P161C ECU system MIL drive module is overheated.
Fault Description: Malfunction indicator lamps (MIL) are located on instrument panel cluster (IPC). MILs inform
driver about fault generation and necessary maintenance for engine control system. Control module monitors MIL
control circuit for inconformity of commands for MILs. For example, when MIL is disconnected by command, control
module monitors low voltage or when MIL is connected by command, control module monitors high voltage. This is
indicated that there are faults. When control module discovers incorrect voltage or overhigh temperature of MIL
control circuit, DTC occurs. In the case of 20 samplings for output status of MIL drive, open circuit or overhigh
temperature faults are detected in 15 samplings at least. There are 100msec for each sampling. ECU detects incorrect
output status or overlarge current of MIL drive and such status lasts for more than 2sec; for every 10 samplings of
MIL drive output status, there are short circuit faults in 5 samplings at least with time consumption for each sampling
process as 12.5msec and ECU detects short circuit for more than 1sec under MIL drive output status. In the case of
conditions above, DTCs occur.
Diagnosis Hint: When short circuit fault is detected, control module should stop starting MIL drive within remained
travel. Control module records operation condition when diagnosis is failed. For the first diagnosis failure, control
module will keep this information in fault record. If diagnosis failure occurs during the second continuous ignition
cycle, control module records operation condition under diagnosis failure and writes the operation condition in frozen
fault condition and updates fault record.
Terminal ECU
K70 System MIL output signal
K71 OBD indicator lamp
Malfunction indicator lamp (MIL)
OBD indicator lamp
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