Suzuki GSX-R750 Service Manual page 209

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Step
1
5) Under this condition, if a suitable screwdriver touching
the pick-up surface of the speed sensor is moved, the
tester reading voltage changes (0 V → 12 V or 12 V → 0
V). If the tester reading voltage does not change, replace
the speedometer sensor with a new one.
NOTE
While testing, the highest voltage reading should
be the same as the battery voltage (12 V).
Is the voltage OK?
Action
I837H1110119-01
Engine General Information and Diagnosis:
Yes
• P wire open or
shorted to ground.
• Loose or poor
contacts on the
speed sensor coupler
or ECM coupler
(terminal "2").
• If wires 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.
1A-137
No
• Inspect that metal
particles or foreign
material stuck on the
speed sensor and
rotor tip.
• If there are no metal
particles and foreign
material, then replace
the speed sensor
with a new one.

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