WebApr 30, 2024 · Fan override switch should be an input to the ECM separate from the fan clutch and solenoid circuit. Like truckmechanic said, check your switch. I think the ECM is looking for a ground at pin (15) of the OEM connector to have the fan off. The override switch allows this path to ground. WebCustomer: Cummins ISX 12 fault code 6263 SPN647 FMI 3Checked resistance from ecm OEM connector signal and return to fan clutch solenoid both showing .1 ohmsReplaced Fan clutch solenoid still have active fault for 6263Swapped ecm from sister truck Still has active fault Answered by Nich1019 in 5 mins 6 months ago Nich1019 Auto Mechanic
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WebMay 1, 2011 · The ecm controls the fan to either go on or off, If the clutch is not locked up and you have either checked the above causes for this problem. You will need to go to a dealer and have the ecm parameters and ecm checked, There is an override test that can only be done with cummins insite program. WebSearch our large inventory of New/Rebuilt/Used Cummins ISX15 Engine Fan Clutches for sale. Enjoy our hassle-free online checkout or call to speak to an expert. ... Horton style … onto new horizons
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