Suzuki RMX450Z Service Manual page 130

1A-61 Engine General Information and Diagnosis:
Step
1 1) Turn off the ignition switch.
2) Remove the fuel tank. Refer to "Fuel Tank Removal and
Installation" in Section 1G (Page 1G-5).
3) Check the GP switch lead wire coupler (1) for loose or
poor contacts.
If OK, then measure the GP switch voltage.
4) Insert the needle-point probes to the lead wire coupler.
5) Turn on the ignition switch.
6) Measure the voltage between P wire and B/W wire,
when shifting the gearshift lever from 1st to Top.
Special tool
(A): 09900–25008 (Multi circuit tester set)
(B): 09900–25009 (Needle-point probe set)
Tester knob indication
Voltage ( )
GP switch voltage
0.6 V and more
((+) terminal: P – (–) terminal: B/W)
Is the voltage OK?
Action
1
IA02J1110065-01
(A)
(B)
IA02J1110066-01
Yes
• P wire open or
shorted to ground.
• 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
• P or B/W wire open,
or P wire shorted to
ground.
• Loose or poor
contacts on the ECM
coupler.
• If wire and
connection are OK,
replace the GP
switch with a new
one. Refer to "Gear
Position (GP) Switch
Removal and
Installation" in
Section 5B (Page 5B-
11).