Dtc "C40" (P0505 / P0506 / P0507): Isc Valve Circuit Malfunction - Suzuki GSX1300BK B-King Service Manual

1A-94 Engine General Information and Diagnosis:

DTC "C40" (P0505 / P0506 / P0507): ISC Valve Circuit Malfunction

Detected Condition and Possible Cause
Detected Condition
The circuit voltage of motor drive is
C40/P0505
unusual.
Idle speed is lower than the desired idle
speed.
C40/P0506
Idle speed is high than the desired idle
speed.
C40/P0507
ISC valve
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
18 19 20 21 22 23 18 18
Troubleshooting
CAUTION
!
• Be careful not to disconnect the ISC valve coupler at least 5 seconds after ignition switch is turned
to OFF.
If the ECM coupler is disconnected within 5 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-14)".
Wiring Diagram
ECM coupler (Harness side)
24 25 26 27 28 29 30 31 32 33 34
Possible Cause
• ISC valve circuit open or shorted to the ground.
• Air passage clogged.
• ISC valve is fixed.
• ISC valve preset position is incorrect.
• Disconnect ISC valve hose.
• ISC valve is fixed.
• ISC valve preset position is incorrect.
Bl/R
Y
W/Bl
Br
35 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
52 52 52 53 54 55 56 57 58 59 60 61 62 63
B823H11104022
ECM
36 ISC. 1A
53 ISC. 1B
35 ISC. 2A
52 ISC. 2B
I823H1110145-01
64 65 66 67 68 68 68
I823H1110004-01