1A-55 Engine General Information and Diagnosis:
DTC “C40” (P0505, P0506 or P0507): ISC Valve Circuit Malfunction
B705H11104026
Detected Condition and Possible Cause
Wiring Diagram
Detected Condition Possible Cause
ISC valve motor current is higher than the specified
value.
NOTE
If SDS is used, P0505 is indicated.
• ISC valve circuit open or shorted to ground
• Power source circuit open
• Air passage clogged
• ISC valve is fixed
• ISC valve pre-set position is incorrect
Idle speed is lower than the desired idle speed.
NOTE
If SDS is used, P0506 is indicated.
Idle speed is higher than the desired idle speed.
NOTE
If SDS is used, P0507 is indicated.
ECM
IS1A
IS1B
IS2A
IS2B
(35)
(34)
(15)
(36)
ISC valve
B/Lg
G
P/W
W/B
I705H1110085-01
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