Linhai HY740STL 2018 Service Manual page 112

CHAPTER 3 ENGINE
DO NOT: Allow mud or other debris to
accumulate on the surface of the ECU
DO NOT: Apply any voltage relative to any
point to the ECU
DO NOT: Clean ECU with any solvent or
any corrosive liquid
DO: Take extreme care that water droplets
or excess moisture should not fall on ECU
connectors
DO: Clean the ECU with a moist cloth and
keep it dry
3.18.1 .4 Installation requirements
The ECU shall be mounted using M5 machined screws with a torque of 3.9Nm ±10%. The
mounting surface should also be flat to avoid subjecting the base plate to unnecessary force
and warping the PCB.
3.18.1 .5 Power Requirements
Power Supply: The controller's power supply module will power up the
microprocessor if the battery voltage is greater than 6.3 Volts. The power on is
controlled by the controller hardware only.
Operating Range: All planned functions are executed in this range. Battery
and/or Ignition voltage: 9.0 to 16V DC
Power Off: The controller will turn its power off when the ignition voltage: < 6.2
V DC. The controller prepares for entry into Power Down mode. The
preparation involves storing important information into EEPROM.
Reset: During reset, all outputs shall be set to a predefined state. The
controller shall monitor itself for proper operation and enter reset should any
internal errors be detected. The controller shall then restart normal operations
after the computer has properly reset
Over Voltage: the controller will survive no permanent damage if the ignition
voltage do not exceed 26V for more than 1 minute
Reverse Voltage: The controller will survive with no permanent damage: Battery
and/or Ignition voltage < -13V DC for 1 minute
3.18.1 .6 Temperature Requirements
Storage: The controller shall suffer no damage as a result of being stored at
temperatures of -40 C or +105 C continuously for 168 hours. If the storage temperature is
not as extremely high as +105 C or as extremely low as -40 C, the ECU could be stored for
longer time without damage.
Operating: The controller shall operate in the ambient temperature from -20 C to +85 C.
3.18.1 .7 Maintenance service and Repair
ECU is a non-serviceable part. Once there are problems, it's important to first
determine if the problem is caused by software/calibration. If it is caused by
software/calibration, please refer to software/calibration reflashing procedure. In the event of
ECU hardware failure or malfunction (during warranty period only) the ECU should be sent back
to the vehicle manufacturer giving complete details of the ECU Part No, Serial number, Vehicle
Model & Make, manufacturing Date, Total kms run on the vehicle, Location of use, Vehicle No,
Date of return.
Having mud or debris accumulated on the
ECU casing reduces its heat dissipation
efficiency.
Drastically affects the performance of the
ECU and may lead to ECU damage
Can damage the housing of the ECU
ECU connectors can get short and may
lead to ECU damage
Prevents ECU damage
M750L SERVICE MANUAL 18.0
CHAPTER 3 ENGINE PAGE 3- 81