Honda EU30i Manual page 50

From page 4-2
Perform the spark test (page 9-6).
Good spark
Check the cylinder compression (page 14-5).
Normal compression
With the ignition switch OFF, check whether the
throttle valve is fully opened. The throttle lever
should contact the stopper (page 7-5).
Fully opened
Install the spark plug firmly and restart the engine.
Check the harness connecting the throttle control
motor sub harness and inverter unit for open or
short circuit and for proper connection.
CONTROL WIRE HARNESS
2
Y
W
R
Bu
Viewed from terminal side
Normal
Turn the ignition switch OFF and then restart the
engine and check. If the same problem occurs,
replace the inverter unit and retest.
No spark or
weak spark
High cylinder
compression
Low cylinder
compression
Not fully opened
5
Abnormal
TROUBLESHOOTING
Perform "No Spark at Spark Plug" troubleshooting
(page 9-2).
Check for carbon deposits in the combustion
chamber (page 14-3).
•Check the valve clearance (page 3-7 ).
•Check that the cylinder head is correctly
tightened (page 14-3).
•Check for defective cylinder head gasket, valves
or valve seats (page 14-3, 4, 5 and 6).
•Check for worn piston, piston rings or cylinder
(page 15-5, 6, 7, 8 and 9).
Check the throttle control motor (page 7-6).
Normal
Replace the throttle control motor
(page 7-5).
Check the throttle control motor sub harness for
open or short circuit and for proper connection.
THROTTLE CONTROL MOTOR SUB HARNESS
Y
2
Bu
5
R
W
Viewed from terminal side
Normal
Replace or repair the throttle control
motor sub harness.
Replace or repair the control wire harness (page
8-13).
Abnormal
14
4 3 2
Abnormal
4-3