Dtc "C40" (P05057): Isc Valve Circuit Malfunction - Suzuki kq750 Service Manual

DTC "C40" (P05057): ISC Valve Circuit Malfunction

Detected Condition and Possible Cause
Detected Condition
No voltage is applied to ISC valve motor, although ignition
switch is turned ON, or voltage is applied to ISC valve
motor, although ignition switch is turned OFF.
Wiring Diagram
ISC valve
M
Troubleshooting
CAUTION
!
• Be careful not to disconnect at lease 3 seconds after ignition switch is turned to OFF.
If the ECM coupler is disconnected within 3 seconds after ignition switch is turned to OFF, there is a
possibility of an usual valve 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.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to "Use of SDS Diagnosis Reset
Procedures (Page 1A-13)".
Engine General Information and Diagnosis:
• ISC valve circuit open or shorted to the ground.
• ISC valve malfunction.
• ECM malfunction.
B/Lg
R/B
P/W
G
W/Bl
ECM coupler (Harness side)
Possible Cause
ECM
17 IS1A
4 BATT
34 IS1B
16 IS2A
33 IS2B
I831G1110019-01
1A-62
B831G21104019
I831G1110062-01