“C40” (P0505 or P0506 and 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 air cleaner box. (!Page 51)
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.
Idle speed is higher than the normal
condition.
• ISC valve circuit open or shorted to ground
• Power source circuit open
• ISC valve is fixed to full open
• Disconnected ISC valve hose
C40
(P0506)
Idle speed is lower than the desired idle
speed.
• Air passage clogged
• ISC valve is fixed
• ISC valve PRE-SET position is incorrect
C40
(P0507)
Idle speed is higher than the desired
idle speed.
• Disconnected ISC valve hose
• ISC valve is fixed
• ISC valve PRE-SET position is incorrect
ECM
ISC. 1A
ISC. 1B
ISC. 2A
ISC. 2B
BATT
ISC valve
Lbl
W/Y
Dbr
R/W
Lg
12 V
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 discon-
nected 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 oper-
ation.
1
DL650K7/AK7 (’07-MODEL) 13-35
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