TROUBLESHOOTING GUIDE

F-49prose procedure

STEP	INSPECTION	RESULT	ACTION
5	Disconnect ISC valve connector at idle and check if "clicking" is heard from ISC valve	Yes	Go to next step
5	Disconnect ISC valve connector at idle and check if "clicking" is heard from ISC valve	No	Replace ISC valve (page F-99)
6	Check for correct idle speed (page F-76) Idle speed: 850 ± 50 rpm	Yes	Go to next step
6	Check for correct idle speed (page F-76) Idle speed: 850 ± 50 rpm	No	Adjust (page F-76)
7	Try known good ECU and check if condition improves (page F-127)

INSPECTIONDisconnect ISC valve connector at idle and check if "clicking" is heard from ISC valve

RESULTYes

ACTIONGo to next step

INSPECTIONDisconnect ISC valve connector at idle and check if "clicking" is heard from ISC valve

RESULTNo

ACTIONReplace ISC valve (page F-99)

INSPECTIONCheck for correct idle speed (page F-76) Idle speed: 850 ± 50 rpm

RESULTYes

ACTIONGo to next step

INSPECTIONCheck for correct idle speed (page F-76) Idle speed: 850 ± 50 rpm

RESULTNo

ACTIONAdjust (page F-76)

INSPECTIONTry known good ECU and check if condition improves (page F-127)

RESULT

ACTION

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