Suzuki GSF1250 Service Manual page 96

1A-27 Engine General Information and Diagnosis:
Step
2 1) Crank the engine several seconds with the starter motor,
and measure the CKP sensor peak voltage at the
coupler.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
CKP sensor peak voltage
2.0 V and more
((+) terminal: Bl/Y – (–) terminal: G)
2) Repeat the 1) test procedures several times and
measure the highest peak voltage.
Is the voltage OK?
Action
(A)
Peak volt
adaptor
I718H1110158-03
Yes
• G/Y or Br wire open
or shorted to the
ground.
• Loose or poor
contacts on the CKP
sensor coupler or
ECM coupler
(terminal "14" or
"31").
• If wire and
connection are OK,
intermittent trouble or
faulty ECM.
• Recheck each
terminal and wire
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
one, and inspect it
again. Refer to "ECM
Removal and
Installation in Section
1C (Page 1C-1)".
No
• Inspect that metal
particles or foreign
material stuck on the
CKP sensor and rotor
tip.
• If there are no metal
particles and foreign
material, then replace
the CKP sensor with
a new one. Refer to
"CKP Sensor
Removal and
Installation in Section
1C (Page 1C-1)".