First time on here, so be gentle.. :-) Was cruising around on the site earlier because my 2003 Grand Vitara's 4 wheel drive light started flashing and I have no 4-wheel drive. Read a couple of the post and tried pinching the hose going to the differential. With the ignition on the pump cycles in and out about once every 3 or 4 seconds, if I pinch the hose very close to the pump it Cycles in and out so fast it sounds like a rattle. Just wondering if this means that the actuator pump is bad, I was thinking the diaphragm in the pump? Any help would be greatly appreciated, thank you!