SYM 4
. ELECTRONICALLY CONTROLLED CARBURETOR SYSTEM
4-11
Electronic control unit connector illustration:
Function description
Pin Number
The signal of pin number
Pin Number
The signal of pin number
1 Power supply 11
2 Signal ground connection
12 K-Line sequence line
3 O2 Sensor Input 13 Temperature sensor Input
4 TPS Input 14 Engine stop
5 Sense 15
6 16 Trouble light output
7 Transfer switch 17 Power Grounding
8 PWM gulp valve Output 18 Ignition Output
9 19
10 +5V Sensor Supply
Function description:
●
Using 9 ~ 16 v direct current supply power source, a total of 18 pcs pin plug.
●
The hardware parts is controlled by a 16-bit microcomputer as its core, containing the processed
interfacial functional loop of engine temperature sensor, and others driving components such as:
transistor ignition coil、Solenoid valve、fault light.
●
The software parts’ main composition is monitor strategic operational programme on the controller ,
containing the control strategy, array data (MAP) and auto-diagnosis etc.
Testing Procedures:
1.Connect the computer, which is installed ECU diagnostic software, to the diagnostic of vehicle by the
communication line
2.Key-on but don’t start the engine, conform whether the electronic controlled unit and diagnostic software
can be online
3.The diagnostic software will auto-connect and tip when connect successful
4.Confirm the Electronic controlled unit
5.Confirm whether diagnostic software
6.According to tip about the fault code servicing inspection, to ensure that the fault code has been
cancelled.
7.Start the engine, inspect the parameters value of the diagnostor.
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