Dtc "C40" (P0505 / P0506 / P0507): Isc Valve Circuit Malfunction - Suzuki GSX-R750 Service Manual

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 higher than the desired idle
speed.
C40/P0507
Wiring Diagram
ISC valve
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 unusual value being written in the 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 terminal damage.
NOTE
After repairing the trouble, clear the DTC using SDS tool. Refer to "Use of SDS Diagnosis Reset
Procedures (Page 1A-15)".
ECM coupler (Harness side)
1 2 3 4 5 6 7 8 9 10 11 12
13 14 15 16 17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32 33 34 35 36
Engine General Information and Diagnosis:
Possible Cause
• ISC valve circuit open or shorted to ground.
• Air passage clogged.
• ISC valve is fixed.
• ISC valve preset position is incorrect.
• Disconnected ISC valve hose.
• ISC valve is fixed.
• ISC valve preset position is incorrect.
Bl
Y
G
Br
37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70 71 72
1A-97
B838H21104024
ECM
39 ISC. 1A
38 ISC. 1B
37 ISC. 2A
49 ISC. 2B
I837H1110079-01
I837H1110007-02