Suzuki LT-Z400, Service Manual

Page: 126 / 492

1A-59 Engine General Information and Diagnosis:
Troubleshooting
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures (Page 1A-12)”.
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Check the GP switch coupler for loose or poor contacts.
If OK, then measure the GP switch voltage.
3) Make sure the engine stop switch is in the “RUN”
position.
4) Insert the needle pointed probe to the lead wire coupler.
5) Turn the ignition switch ON.
6) Measure the voltage at the wire side coupler between W
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 pointed probe set)
Tester knob indication
Voltage (
)
GP switch voltage
0.9 V and more
((+) terminal: W – (–) terminal: B/W)
Is the voltage OK?
• W 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-2)”.
• W 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-12)”.
I933H1110061-01
V
(B)
(A)
I933H1110062-01
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