Fan Clutch Output Electrical Fault

Possible symptoms yellow electronic malfunction lamp illuminated increased fuel consumption fan runs at full speed.

Radiator fan function. Fault condition short to positive in the cooling fan control circuit. This applies to the complaint of fan running all of the time. Faulty signal at pin b49.

1 check all cables and connectors between the engine ecu and the clutch solenoid. Check ecm fan output replace pressure switch. 2000 mack e7 350 no fan clutch output fault code 4 2.

Fan is always deactivated or always activated if fault is intermittent. 2 check the solenoid. Install the horton ec tm fan clutch on the engine.

Check refrigerant charge level in the system. Ecm spn 647 engine fan clutch output device driver mid 128 sid 33 fmi 3. If it feels rough or does not turn then replace the drive.

It should turn smoothly with some drag. Listen out for a gentle roar from the fan clutch when youre driving at least 50 miles per hour as this can indicate that its binding or locking up. 15 to 25 percent of the engine specifications features benefits fan speed vs.

Check mechanical integrity of clutch with engine off rotate fan by hand. Fmi description voltage above normal or shorted to high source. The fan clutch unit is approximately 1 foot tall by 1 foot wide.

Conditions for fault code. Short circuit in the clutch solenoid wiring. Then test the fan clutch by giving it a good push.

Next locate the fan clutch bolted to the water pump in the engine compartment. Fully engaging the fan clutch constant cooling reduces engagement cycles and prolongs the life of the fan clutch fan belts and belt tensioner maximum fan output with minimal horsepower draw 2 year200000 mile warranty viscous engagement speed. If the goal is to determine the root cause of the issuefaulty fan clutch or the control circuit unplug the fan clutch connector run the engine at 2000rpm for 2 minutes the fan should not be roaringfully engaged the fan clutch should be disengaged with no voltage applied.

Start delay compressor lubrication cycle. Remove pressure restriction from high side of the system. If loosened the p clamp must be re tightened to prevent the wiring harness from slipping through the p clamp causing tension on the fan clutch wiring.

Do not loosen the p clamp attaching the wiring harness to the metal tab on the fan clutch. Also verify no indication of viscous fluid leakage. 2000 mack ch613 engine e7 350 yes the fan clutch had no power answered by a verified technician.