System and method for diagnosing a fault in a switchable water pump for an engine based on a change in crankshaft speed

摘要

A system according to the principles of the present disclosure includes a pump control module and a pump diagnostic module. The pump control module commands a water pump to switch between on and off, wherein the water pump circulates coolant through an engine when the water pump switches on as commanded. The pump diagnostic module diagnoses a fault in the water pump based on a change in a crankshaft speed of the engine when the water pump is commanded to switch between on and off.

主权项

1. A system comprising:
a pump control module that commands a water pump to switch between on and off, wherein the water pump circulates coolant through an engine when the water pump switches on as commanded; a speed change module that determines a change in a crankshaft speed of the engine when the water pump is commanded to switch between on and off; and a pump diagnostic module that diagnoses a fault in the water pump when the change in the crankshaft speed is less than a first predetermined value.