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Car Forum / Mazda / Mazda Cars / February 2008WTH is a "5TH Gear Switch"?
Had this happen on my Nissan, and now on the Mazda. On the 240SX, a friend said I was driving down the road with my reverse lights on. I found two switches on the tranny, swapped them and the lights were good. The other switch was directly opposite the reverse switch, so I figured it my be switched when the car is in 5th gear. I noticed some broken wires under the Mazda, again opposite the reverse switch, and took a look at my Haynes and saw an entry for "5th Gear Switch". It is in the addendum that covers '88-92 626 FI models. It didn't say what it did, it just showed the connection and gave a method for testing it. According to about the only thing I could find on the Internet pertaining to a Toyota P/U 5th gear switch, it seems it cuts out the emissions. Any ideas? > Had this happen on my Nissan, and now on the Mazda. On the 240SX, a friend > said I was driving down the road with my reverse lights on. I found two [quoted text clipped - 12 lines] > > Any ideas? Probably lets the instrument panel know when the car is in the highest gear so that that infernal upshift light isn't always blinking at you. At least that's what it was for on VWs. nate  Signaturereplace "roosters" with "cox" to reply. http://members.cox.net/njnagel "OD" Overdrive light maybe ? > Had this happen on my Nissan, and now on the Mazda. On the 240SX, a friend > said I was driving down the road with my reverse lights on. I found two [quoted text clipped - 12 lines] > > Any ideas? > "OD" Overdrive light maybe ? Perhaps on an AT, but these were on Manual transmissions. I still haven't really found anything definitive on this! >> Had this happen on my Nissan, and now on the Mazda. On the 240SX, a >> friend said I was driving down the road with my reverse lights on. I [quoted text clipped - 13 lines] >> >> Any ideas? On Sun, 24 Feb 2008 23:40:06 GMT, Hachiroku ???? <Trueno@AE86.gts> wrote: >> "OD" Overdrive light maybe ? > >Perhaps on an AT, but these were on Manual transmissions. > >I still haven't really found anything definitive on this! Why not disconnect the switch and see what happens (or doesn't happen) when you shift to 5th gear? Odds are that you won't blow the engine or transmission. >>> Had this happen on my Nissan, and now on the Mazda. On the 240SX, a >>> friend said I was driving down the road with my reverse lights on. I [quoted text clipped - 13 lines] >>> >>> Any ideas? >>> "OD" Overdrive light maybe ? >> [quoted text clipped - 5 lines] > when you shift to 5th gear? Odds are that you won't blow the engine or > transmission. It was disconnected! I reconnected it. I did notice improved throttle response in 5th gear on the highway. I'll keep an eye on the fuel economy... >>>> Had this happen on my Nissan, and now on the Mazda. On the 240SX, a >>>> friend said I was driving down the road with my reverse lights on. I [quoted text clipped - 13 lines] >>>> >>>> Any ideas? >> "OD" Overdrive light maybe ? > > Perhaps on an AT, but these were on Manual transmissions. > > I still haven't really found anything definitive on this! Several of my manual trannies have had an OD light when so equipped. Volvo for sure and I don't remember on my Mazda. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 'New' frame in the works for '08. Some Canadian Bush Trip and Build Photos: http://mikeromainjeeptrips.shutterfly.com > Had this happen on my Nissan, and now on the Mazda. On the 240SX, a friend > said I was driving down the road with my reverse lights on. I found two [quoted text clipped - 12 lines] > > Any ideas? Does it have an 'upshift' light? If so it might be there to say 'in 5th gear, can't upshift any more'. I check OEM mazda service manuals and wiring diagrams to get a better clue later. >> Had this happen on my Nissan, and now on the Mazda. On the 240SX, a >> friend said I was driving down the road with my reverse lights on. I [quoted text clipped - 17 lines] > gear, can't upshift any more'. I check OEM mazda service manuals and > wiring diagrams to get a better clue later. I think I'll have to check the dealer. Nope, no Upshift light (THANK GOD!!! I dismantled the dah on a bran new Jetta in 1985 because of those stupid things!) >>> Had this happen on my Nissan, and now on the Mazda. On the 240SX, a >>> friend said I was driving down the road with my reverse lights on. I [quoted text clipped - 21 lines] > GOD!!! I dismantled the dah on a bran new Jetta in 1985 because of those > stupid things!) I am going through the 1989 mazda MX6/626 OEM shop manual. I cannot find anything called a '5th gear switch'. There is however an entry for a 'speed switch 113mph (180kph)'. not much other info on it than showing it as a switch on wiring diagrams. >> I think I'll have to check the dealer. Nope, no Upshift light (THANK >> GOD!!! I dismantled the dah on a bran new Jetta in 1985 because of those [quoted text clipped - 4 lines] > 'speed switch 113mph (180kph)'. not much other info on it than showing it > as a switch on wiring diagrams. LOL! I DON'T WANT ONE OF THOSE!!!!! Japanese cars are made to cut out at 180kPh by Japanese law. That's the switch that, I believe, kills the fuel pump once that speed is reached. Don't have one on my '85 Corolla GTS. Hit 130 MPH with that car once... On Wed, 27 Feb 2008 01:18:53 GMT, Hachiroku ???? <Trueno@ae86.gts> wrote: >>> I think I'll have to check the dealer. Nope, no Upshift light (THANK >>> GOD!!! I dismantled the dah on a bran new Jetta in 1985 because of those [quoted text clipped - 11 lines] > >Don't have one on my '85 Corolla GTS. Hit 130 MPH with that car once... Oh, don't forget the legally required in Saudi Arabia speed switch that turns on a very loud and annoying buzzer at IIRC 62 MPH... They do put "soft" speed limiters (that do progressive fuel cut in the EFI) in some 'economy' cars that come equipped with regular tires good for only 110 MPH or so, so you don't get out on the Autobahn or a straight arrow West Texas Highway running flat out and overheat & blow a tire or two. The fifth-gear switch moves the rev-limiter redline in 5th down to the max tire safe speed. This is why they put the Z-rated high-performance tires on the hot cars - no speed limiters - and the tire shops refuse to put any lesser rated replacement tires on them, because the tort lawyers make the shop owners unwilling to take the risk. If the car calls for Z tires and the tire shop only puts on S-rated tires (still good for any road-sane speeds in the US) or unrated tires (still good for 80-plus MPH) and the tire blows at speed and causes an accident, the tire shop can be sued. --<< Bruce >>-- > If the car calls for Z tires and the tire shop only puts on S-rated > tires (still good for any road-sane speeds in the US) or unrated tires > (still good for 80-plus MPH) and the tire blows at speed and causes an > accident, the tire shop can be sued. I remember, about 15-20 years ago, the race they have outin the desert in Nevada. Some Dr. shows up with a brand-new Ferrari, and the inspector says, no, you have the wrong tires and no fuel cell. The Dr gets into an arguement with him, they call a stweward over, and then a race official. The Dr had run the race before, so the official waives the rules. Guy blows a tire, goes off the road, he gets out, the tank catches fire and the wife dies. Dr sues the race officials. How stoopid can you be?
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