Page 238 - Foton Workshop Manual - Aumark (BJ1099)

11-12 ENGINE CONTROL SYSTEM - ENGINE CONTROL MODULE(ECM)

ENGINE CONTROL MODULE (ECM)

1. Principle of Work
ECM is an electronic engine control center with the sensor signal input interface and
actuator drive circuit, which is mainly composed of microprocessor as its core. It
receives and processes the engine state signals input by each sensor and send the
control signal to the actuator, so as to make the engine to work in accordance with
the scheduled program, keeping the engine working in the best state and ensuring
good dynamic performance, fuel economy and emission performance.
ECM has the self-protection function. A failure in starting may occur during the
maintenance, however, everything will be working fine after replacing the ECM,
therefore it is possible that ECM goes out of order, in fact, ECM is not damaged,
just because the ECM enters into the self-protection mode and ECM will be back to
normal after a while.
2. Working voltage range:9~16V
3. Working environment temperature:-40℃ ~70℃
4. Removal of ECM
(a). Turn ignition switch off, disconnect battery negative cable.
NOTICE:
Before disconnecting and reconnecting battery negative cable, please firstly turn off ignition
switch and lighting switch, completely loosen the nut tightened on the battery negative
terminal. Do not levering cable terminal in the process of performing these operations.
(b). Disconnect the ECM connectors.
NOTICE:
After removing the connector, ensure the connector's connection part not to be contacted
with the dirt, water and other impurities.
(c). Remove ECM fixed bolt, take ECM down.
NOTICE:
After removing ECM, pay attention to being protected from the water, it is neither allowed
to be stained with water, nor to be immersed in the water. Pay attention to the protection
for the plug pin. Before removing ECM, please firstly remove battery negative cable for
more than 1 min. Do not allow collision, ECM must be removed with care.
5. Install ECM
NOTICE:
Pay attention to the electrostatic protection during installation.
(a). Install ECM, assemble the fixed bolt and fasten it.
(b). Connect the ECM connectors.
(c). Connect the battery negative.

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