Suzuki GSX-R750, Service Manual

Page: 353 / 495

7-22 ELECTRICAL SYSTEM
TROUBLESHOOTING
* Check that the transmission is in neutral and the
No spark or poor spark engine stop switch is in the “RUN” position. Grasp
the clutch lever. Check that the fuse is not blown
and the battery is fully-charged before diagnosing.
Check the ignition system couplers for
Looseness • Poor connection of couplers
poor connections.
Correct
Measure the battery voltage between
input lead wires (O/W and B/W) at the
ECM with the ignition switch in the
Incorrect • Faulty ignition switch
“ON” position. • Faulty turn signal/side-stand
relay
• Faulty engine stop switch
Correct • Broken wire harness or poor
connection of related circuit
couplers
Measure the ignition coil primary peak
voltage. (
7-23, -24) Inspect the spark plugs.
NOTE: This inspection method is
Correct
( 2-5)
applicable only with the multi circuit
tester and the peak volt adaptor.
Correct Incorrect
Incorrect
• Faulty spark plug (-s)
• Poor connection of the
ignition coil/plug cap (-s)
Inspect the ignition coil/plug caps.
(
7-25)
Incorrect • Faulty ignition coil/plug cap(-s)
Correct
Measure the crankshaft position sensor
peak voltage and its resistance.
(
7-26, -27) Incorrect • Faulty crankshaft position
NOTE: The crankshaft position sensor
sensor
peak voltage inspection is applicable
only with
the multi circuit tester and
peak volt adaptor.
Correct
• Faulty ECM
• Poor connection of ignition
couplers.