Service manual

Fuel Injection System

11-1 ECU

Principle:

Electronic Control Unit (ECU) is the brain of the

whole electronic system. ECU is effective in

analyzing and processing information supplied

by sensors and issuing conclusion-induced

commands to any actuator for optimization of the

running engine.

Function:

1. Receive signals from the engine’s RMP sensor.

2. Receive signals for the engine’s load.

3. Control injection of fuel.

4. Control ignition.

5. Control the idle speed.

6. Supply power (5V/100mA) to any sensor.

7. RPM signal outputs (TN signal)

8. Vehicle speed signal inputs

9. Diagnose troubles of actuators and sensors.

Case lvel: Ingress Protection, IP54K

Microcomputer system:

Microcontroller: 512k FLASH; program memory: 36K RAM

Short-circuit protection:

Under the normal status, the short-circuit protection is applicable to all pins (for ECU’s inputs and

outputs) to battery’s voltages and GND except Pin# 2 & 21 (to GND) and Pin# 5 & 23 (to power

supply).

Limit:

Battery voltage: Smallest operating voltage=9V

Temperature: Operating temperatures: -40〜+70

Storage temperature: -40〜+90

ECU's appearance