Troubleshooting-Efi Model - Sym Joyride 125 Service Manual

1. GENERAL INFORMATION

Troubleshooting-EFi model

A. Engine cannot be started or difficult to be started
Check and adjustment
Press the fuel injector feed pipe and confirm
whether there is fuel in the feed pipe
The fuel supply to the fuel injector is
sufficient
Check the spark plug ignition
condition
Perform cylinder compression
pressure test
Normal cylinder compression pressure
Restart the engine
Remove and check the
spark plug
Dry spark plug
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Fault condition
The fuel injector is not
supplied with sufficient fuel
Sparks
Low or no compression
pressure
No ignition With signs of ignition but
the engine cannot be
started
Week sparks or no spark
Wet spark plug
Probable causes
1. Check the fuel amount in the fuel tank
2. Check if the fuel pipe and the vacuum
tube are blocked or not
3. Malfunction of fuel pump relay or wiring
4. Malfunction of fuel pump
5. The fuel strainer is blocked or not
1. Malfunction of spark plug
2. Spark plug contamination
3. Malfunction of ECU
4. Malfunction of the AC Generator
5. Ignition coil is in open or short circuit
6. Malfunction of main switch
1. Piston ring seized
2. Malfunction of cylinder valves
3. Worn cylinder and piston ring
4. Cylinder gasket leakage
5. Sand hole in the compression parts
1. Malfunction of throttle valve operation
2. Air sucked into intake manifold
3. Incorrect ignition timing
1. Contaminated or clogged fuel injector
2. Malfunction of throttle valve operation
3. Malfunction of fuel pressure regulator