Viscous Fan

Viscous Fan

Description
The performance of the viscous fan is monitored by comparing the actual fan speed versus the target speed. When the entry conditions are satisfied the actual fan speed is continually checked against the target speed, if the speed vary by greater then 20 rpm for longer than the defined period then a failure is logged. Should the failure be logged on two consecutive drive cycles then the appropriate DTC will be logged.





If the above table does not include details of the following enabling conditions: - IAT, ECT, vehicle speed range, and time after engine start-up then the state of these parameters has no influence upon the execution of the monitor.