Suzuki GSX-R1000 2007, Service Manual

Page: 234 / 549

FI SYSTEM DIAGNOSIS 4-79
“C40” (P0505 or P0506 and P0507) ISC VALVE CIRCUIT MALFUNCTION
INSPECTION
Step 1
1) Turn the ignition switch OFF.
2) Remove the air cleaner box. (
5-14)
3) Check the ISC valve coupler for loose or poor contacts.
If OK, then check the ISC valve lead wire continuity.
DETECTED CONDITION POSSIBLE CAUSE
C40
(P0505) The circuit voltage of motor drive is
unusual. • ISC valve circuit open or shorted to ground
• Power source circuit open
C40
(P0506) Idle speed is lower than the desired idle
speed. • Air passage clogged
• ISC valve is fixed
• ISC valve pre-set position is incorrect
C40
(P0507) Idle speed is higher than the desired
idle speed. • Disconnected ISC valve hose
• ISC valve is fixed
• ISC valve pre-set position is incorrect
ECM
ISC. 1A
ISC. 1B
ISC. 2A
ISC. 2B
ISC valve
Bl
Y
G
Br
* Be careful not to disconnect the ISC valve coupler at least 5 seconds after ignition switch is
turned OFF.
If the ECM coupler or ISC valve coupler is disconnected within 5 seconds after ignition switch
is turned OFF, there is a possibility of an unusual valve position being written in ECM and
causing an error of ISC valve operation.
* When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler
with a needle pointed tester probe to prevent the terminal damage or terminal bend.
1