18-28 VL800/C/TK9 (’09-MODEL)
“C40” (P0505/P0506/P0507) ISC VALVE CIRCUIT MALFUNCTION
INSPECTION
NOTE:
After repairing the trouble, clear the DTC using SDS tool.
Step 1
1) Turn the ignition switch OFF.
2) Remove the fuel tank. ( Page 14-93)
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
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
Y
ECM
Bl
Br
G/W
ISC valve
ISC. 1A
ISC. 1B
ISC. 2A
ISC. 2B
* Be careful not to disconnect the ISC valve coupler at least 5 seconds after ignition switch is
turned to OFF.
If the ECM coupler or ISC valve coupler is disconnected within 5 seconds after ignition switch
is turned to OFF, there is a possibility of an unusual valve position being written in ECM and
causing an error of ISC valve operation.
* Once the ISC valve has been removed or replaced, the ISC valve preset must be performed
using SDS tool. (Page 18-54)
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