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ISC (idle speed control) valve open or short circuit is detected.
Fault code No.
Used diagnostic code No. D54 (ISC (idle speed control)valve)
Inspection operation item and
Operation item and countermeasure
Reinstated by set-
ting the main switch
to ON, The ISC (idle
speed control) valve
fully closes, and
then it opens until it
is at the standby
when the engine is
Connected condition of con-
Inspect the coupler for any
pins that may have pulled
Check the locking condition
of the coupler.
Open or short circuit in lead.
Detective ISC (idle speed con-
If there is a malfunction, repair it and connect
ISC (idle speed control) valve coupler
Main wiring harness ECU coupler
Repair or replace if there is an open or short
Between ISC (idle speed control) valve and
ECU coupler/main harness
gray - gray
sky blue-sky blue
Execute diagnostic mode (code No.D54)
Replace the throttle body.
Do not remove the ISC (idle speed control)
Refer to “THROTTLE BODY AND FUEL IN-
FUEL INJECTION SYSTEM
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