Maintenance Manual for Chery·Windcloud MOTOROLA EFI System
6
6. Electronic Control Unit (ECU)
Purpose:
With microprocessor as core composition,
ECU has a sensor signal input interface, also,
it is an electric control engine control center
for actuator drive circuit, which receives and
processes engine condition signals inputed by
sensors, and sends out control signal to
actuators so as to make the engine work as
per scheduled program and achieve optimum
condition of engine as well as ensure
favorable power, fuel consumption and
emission.
Normal operation voltage: 9-16V
Composition: it has shielded casing and
printed circuit board, which integrates lots of
electronic control units for the control of EFI
system.
Installation: to be fixed by the support of
bracket under pilot trench of front windshield.
Pay attention to waterproofing.
ECU
Functions:
Multipoint group injection
Controlling ignition
Idle speed control
Knocking control
Providing sensors with power supply:
5V/100mA
λclosed-loop control with self-adaptation
Controlling carbon canister control valve
Air conditioning switch
Engine-failure indication lamp
Engine speed signal output
Failure self-diagnosis with flash code
function
Accepting engine load signal
Troubleshooting: due to the fact that ECU
(electric control unit) has low failure rate, so
generally it is not advisable to replace ECU for
troubleshooting on any problem. Failure of
components such as periphery circuit and
sensors shall be checked and solved firstly. Do
not replace ECU until all periphery components
are confirmed to be fault-free.
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