Suzuki VLR1800, Service Manual

Page: 100 / 624

1A-31 Engine General Information and Diagnosis:
Troubleshooting
CAUTION
!
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with a
needle pointed tester probe to prevent terminal damage.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures (Page 1A-14)”.
When indicating C13 for IAP sensor #2 / When indicating C17 for IAP sensor #1 (Use of mode select switch)
Step Action Yes No
1 1) Remove the fuel tank. Refer to “Fuel Tank Removal and
Installation in Section 1G (Page 1G-8)”.
2) Turn the ignition switch OFF.
3) Check the IAP sensor coupler (#2 (1) or #1 (2)) for loose
or poor contacts.If OK, then measure the IAP sensor
input voltage.
4) Disconnect the IAP sensor coupler.
5) Turn the ignition switch ON.
6) Measure the voltage between the R wire and ground.
If OK, then measure the voltage between the R wire and
B/Br wire.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage (
)
IAP sensor input voltage
4.5 – 5.5 V
((+) terminal: R – (–) terminal: Ground, (+) terminal: R
– (–) terminal: B/Br)
Is the voltage OK?
Go to Step 2. • Loose or poor
contacts on the ECM
coupler. (terminal “11”
or “29”)
• Open or short circuit
in the R or B/Br wire.
1
2
I822H1110016-01
(A)
V
I823H1110016-05