Ignition System; Troubleshooting Chart - Yamaha EF1000iS Service Manual

IGNITION SYSTEM

TROUBLESHOOTING CHART

Inspection steps:
1. Spark plug
2. Ignition spark gap
3. Spark plug cap
4. Ignition coil resistance
5. Air gap
NOTE:
9 Remove the following part(s) before troubleshooting.
1) Front cover and rear cover
2) Cylinder air shroud 1
3) Cylinder air shroud 2
9 Use the following special tool(s) for troubleshooting.
Pocket tester:
YU-03112, 90890-03112
Digital circuit tester:
90890-03174
1. Spark plug
9 Check the spark plug condition.
Refer to "SPARK PLUG" in CHAPTER 2.
GOOD
2. Ignition spark gap
9 Disconnect the spark plug cap 1 from the
spark plug.
9 Connect the dynamic spark tester 2 or igni-
tion checker 3 as shown.
Spark plug cap 1 → Dynamic spark
tester or ignition checker
Dynamic tester lead or ignition checker
lead → Spark plug 4
å For USA
å Except for USA
9 Turn the crankshaft and measure the igni-
tion spark gap a.
IGNITION SYSTEM
NO SPARK OR WEAK SPARK
6. Engine switch
7. Oil level switch
8. Wire harness
NO GOOD
5-4
Dynamic spark tester:
YU-34487
Ignition checker:
90890-06754
Repair or replace the spark plug.
å
∫
ELEC
SVU4055
SVU4060