1A-94 Engine General Information and Diagnosis:
DTC “C40” (P0505 / P0506 / P0507): ISC Valve Circuit Malfunction
B947H11104024
Detected Condition and Possible Cause
Wiring Diagram
ECM coupler (Harness side)
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-14).
Detected Condition Possible Cause
C40/P0505
The circuit voltage of motor drive is
unusual.
• ISC valve circuit open or shorted to ground.
C40/P0506
Idle speed is lower than the desired idle
speed.
• Air passage clogged.
• ISC valve is fixed.
• ISC valve preset position is incorrect.
C40/P0507
Idle speed is higher than the desired idle
speed.
• Disconnected ISC valve hose.
• ISC valve is fixed.
• ISC valve preset position is incorrect.
ECM
ISC. 1A
ISC. 1B
ISC. 2A
ISC. 2B
ISC valve
Y
Bl
Br
G
Y
Bl
Br
G
39
38
37
49
I947H1110065-01
123456789101112
13 14 15 16 17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32 33 34 35 36
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
I837H1110007-02
Manuals by Motomatrix / The Solution For Lost Motorcycle Coded Keys
email: info@motomatrix.co.uk / www.motomatrix.co.uk
To Next Page
Loading...
Need help?
General
