Date: Fri, 23 Jun 2006 09:31:40 +0100 From: Colin Stamp <col.dustbinnospamp.plus.com> Subject: Re: 94 9000 cse Shift light in 5th Why?
On 22 Jun 2006 17:31:11 -0700, "Izodmartin" <izodmartinnospaml.com> wrote: > >Craig M. Bobchin wrote: >> Hi, >> >> In all my years of driving Saabs, I've never seen this one. My '94 CSE >> has reently started showing some very strange behavior. When I'm >> cruising in 5th the shift light comes on. I'm pretty certain it is a >> switch somewhere, but I don't know enough to know what switch nor how >> hard/expensive it is to replace. Any ideas? > >This is actually a very bad thing. Shift light in 5th gear means the >computer thinks you are still in a lower gear and most likely you are. What is it that makes you think it's "most likely"? I would have said it's *extremely* unlikely that top gear could be un-selectable in such a way that the driver could be fooled into thinking it's still working. >The reasons are: >1) transmission linkage is "off" and you are not in 5th gear even >though the shifter is(most likely) It's virtually impossible for the driver to fail to notice this. >2) clutch going bad and failing to disengage in higher gears (maybe) Again, a clutch slipping to this extent would be really obvious. The OP would have mentioned it surely? >3) faulty computer (very unlikely) I can't imagine the way in which it might be faulty to cause the reported symptoms and no others. There's only two ways the system could tell whether the gearbox is in 5th or not. 1. Comparing road speed with engine revs - If this was the case, the reported symptoms would be accompanied by others. The speedo or the rev counter would be wonky for example, or the clutch would be slipping badly. 2. There's a "5th" switch on the linkage just like the reversing light switch. Failure of this switch or it's wiring would cause exactly the fault described. Cheers, Colin.
