16 AN650A/K7 (’07-MODEL)
“C40” (P0505 or P0506 and P0507) ISC VALVE CIRCUIT MALFUNCTION
"
INSPECTION
Step 1
1) Turn the ignition switch OFF.
2) Remove the maintenance lid. (#AN650K3 9-13)
3) Check the ISC valve coupler
1 for loose or poor contacts.
If OK, then check the ISC valve lead wire continuity.
DETECTED CONDITION POSSIBLE CAUSE
C40
(P0505)
Although current is flowing though the
ISC valve motor, the current detection is
not possible.
• ISC valve circuit open or shorted to ground
• Power source circuit open
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.
• ISC valve is fixed
• ISC valve pre-set position is incorrect
P/W
ECM
ISC. 1A
ISC. 1B
ISC. 2A
ISC. 2B
ISC valve
B/Lg
W/B
G
* Be careful not to disconnect the ISC valve coupler at least 5 seconds after ignition switch is
turned OFF.
If the ECM coupler or ISC valve coupler is disconnected within 5 seconds after ignition switch
is turned OFF, there is a possibility of an unusual valve position 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.
SAMPLE
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