ELECTRICAL SYSTEM
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Electronic control unit（ECU）
Function introduction
ECU fi rst collects the running data of the engine system in
real time through the sensors of the engine management
system, and then drives the actuator to control the engine
operation according to the system calibration and the
stored calibration data. The ECU is generally installed
under the cover (see
【
A
】
in the fi gure below) and fi xed
on the frame by two M6 bolts【B】(see【B】 in the fi gure
below), with the ECU socket facing downwards.
Electrical characteristics
Working voltage:
Rated voltage: 13.5V
Full functional operating voltage range: 9 V ~ 16 V
Function limited voltage range: 6V ~ 9V, 16V ~ 18V
Ensure the diagnostic function voltage range: 8V ~ 16V
Working current:
Working current :< 1.1 A@13.5v
Static current: <1 mA@13.5v
Electrical protection:
◆ Overvoltage protection: ECU can withstand 24V overvoltage for 60 seconds (ambient temperature
is 23℃±5℃). If the system returns to normal operating voltage within 60 seconds, ECU can still
ensure normal operation.
◆ System reverse voltage protection: If UBR (Pin8) is powered by the main relay, the ECU can
withstand a reverse voltage of 14.0 V for 60 seconds (ambient temperature is 23 ℃ ± 5 ℃, other
connections are correct), within 60 seconds If the system returns to normal working voltage, ECU
can still guarantee normal operation.
◆ Output level protection: The controller drive level has diagnostic protection functions, such as
short-circuit to ground, short-circuit to power supply and open circuit. But it needs to be pointed out
that the ECU ignition pin does not have a short circuit protection function.
Fault diagnosis
The No. 34 pin of the ECU is connected to the K line for fault diagnosis. The K line can be used to call
up the fault information record in the ECU, or manually input some instructions such as clearing the fault
information record, self-learning, etc. ECU failure inspection mainly checks whether the connectors are
well connected and whether the pins are bent or deformed.
B
A
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