Reply To: [Solved] GV 250 EFI 2008 β C27 fault / ISC issue, idle speed too high
Thank you very much for your reply and help for my Problem with the GV250.
Final Fix:we checkt the wire from ISC to ECU for continuity and Short to ground and each other. Harness wiggled during measurement.
No findings.
Connectors checked and cleaned with contact spray. No help.
Finaly a new ECU fixed the Problem. Now there is a stable idle Speed at 1500-1800.
The old ECU triggers the ISC at startup to drive to its end stop, but did not regulates the ISC during Engine run. Β Some fault in the ECU interal ISC driver Part. Maybe a result from a loose ECU attachment in its housing. Now its fixed with a new foam in the housung to hold the ECU correct.