Troubleshooting; Engine - Yamaha EF1000iS Service Manual

TROUBLE SHOOTING

ENGINE

ENGINE DOES NOT START
Check that the oil warn-
ing light turns ON by
pulling the starter rope.
DOSE NOT
LIGHT ON
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
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 connections between oil warning unit
and oil level switch.
GOOD
Check if fuel is deteriorated.
GOOD
Check if fuel is deteriorated.
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
Install a substitute TCI unit to check spark con-
ditions.
GOOD
6-1
TRBL
ENGINE
NO GOOD
NO GOOD
NO GOOD
NO 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
Clean or
replace.
Replace
the fuel
TCI unit.