Yamaha EF4500iSE - Inverter Generator, Theory & Diagnostics Manual

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2-28
Yamaha Generator Theory & Diagnostics Guide
6-1
ENGINE
TRBL
TROUBLE SHOOTING
ENGINE
ENGINE DOES NOT START
Check that the oil warn-
ing light turns ON by
pulling the starter rope.
LIGHT ON
DOSE NOT
TURN ON
Check engine oil level.
SUFFI- INSUFFI-
CIENT CIENT
Check fuel level.
SUFFI- INSUFFI-
CIENT CIENT
Check fuel cock lever
position.
“ON” “OFF”
Check if fuel flows to fuel
cock.
GOOD NO GOOD
Check connections between oil warning unit
and oil level switch.
GOOD NO GOOD
Check if fuel is deteriorated.
GOOD NO GOOD
Replace oil
warning
light, oil
warning
unit, or oil
level
switch.
Add.
Add.
Replace.
Set to
“ON”.
Clean or
replace
fuel pump.
Clean or
replace
fuel cock
Replace
the fuel
TCI unit.
Clean or
replace.
Remove spark plug,
attach it to spark plug
cap, and then ground the
spark plug to check for
spark.
GOOD WEAK OR
SPARK NO SPARK
Check if fuel is deteriorated.
GOOD NO GOOD
9
Check spark plug for dirt and check spark
plug gap.
9
Check for voltage leakage due to faulty con-
nection or broken insulation of the high ten-
sion cord.
9
Check TCI unit connector for corrosion or
faulty connection.
9
Check the ignition system. Refer to “IGNI-
TION SYSTEM” in CHAPTER 5.
GOOD NO GOOD
*
Install a substitute TCI unit to check spark con-
ditions.
GOOD NO GOOD
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ENGINE TROUBLESHOOTING