WTH is a "5TH Gear Switch"?

Hachiroku ハチロク wrote:
> 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?

Why is this in a toyota newsgroup?
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

On Thu, 21 Feb 2008 00:56:37 +0000, Jeff wrote:

> Hachiroku ハチロク wrote:
>> 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?
>
> Why is this in a toyota newsgroup?


I forgot. You don't know anything about cars.

At all.
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

"Hachiroku ????" <Trueno RemoveThis @ae86.gts> wrote in message
news:si5vj.15582$MY2.832@trndny07...
> On Thu, 21 Feb 2008 00:56:37 +0000, Jeff wrote:
>
>> Hachiroku ???? wrote:
>>> 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?
>>
>> Why is this in a toyota newsgroup?
>
>
> I forgot. You don't know anything about cars.
>
> At all.
>

If it is near the shifter opposite the reverse switch, I'd guess neutral
safety switch.
--

Ray O
(correct punctuation to reply)
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

On Wed, 20 Feb 2008 21:27:40 -0600, Ray O wrote:

>
> "Hachiroku ????" <Trueno.RemoveThis@ae86.gts> wrote in message
> news:si5vj.15582$MY2.832@trndny07...
>> On Thu, 21 Feb 2008 00:56:37 +0000, Jeff wrote:
>>
>>> Hachiroku ???? wrote:
>>>> 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?
>>>
>>> Why is this in a toyota newsgroup?
>>
>>
>> I forgot. You don't know anything about cars.
>>
>> At all.
>>
>>
> If it is near the shifter opposite the reverse switch, I'd guess neutral
> safety switch.

Oh, no. In the manual it does say 5th gear switch, but doesn't say
anything about what it does.

I did find a couple web sites; two said it bypasses the EGR valve, and a
Nissan site said it cuts in a rev limiter (the guy was going to wire a
momentary switch on the clutch pedal to have the rev limiter on all the
time when he presses the clutch...I thought I was a geek...)
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

"Hachiroku ????" <Trueno.DeleteThis@ae86.gts> wrote in message
news:FT6vj.19780$eg3.3851@trndny05...
> On Wed, 20 Feb 2008 21:27:40 -0600, Ray O wrote:
>
>>
>> "Hachiroku ????" <Trueno.DeleteThis@ae86.gts> wrote in message
>> news:si5vj.15582$MY2.832@trndny07...
>>> On Thu, 21 Feb 2008 00:56:37 +0000, Jeff wrote:
>>>
>>>> Hachiroku ???? wrote:
>>>>> 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?
>>>>
>>>> Why is this in a toyota newsgroup?
>>>
>>>
>>> I forgot. You don't know anything about cars.
>>>
>>> At all.
>>>
>>>
>> If it is near the shifter opposite the reverse switch, I'd guess neutral
>> safety switch.
>
> Oh, no. In the manual it does say 5th gear switch, but doesn't say
> anything about what it does.
>
> I did find a couple web sites; two said it bypasses the EGR valve, and a
> Nissan site said it cuts in a rev limiter (the guy was going to wire a
> momentary switch on the clutch pedal to have the rev limiter on all the
> time when he presses the clutch...I thought I was a geek...)
>

Hmmm, are there 3 switches on the tranny - reverse lights, neutral safety
switch, and 5th gear switch?

I can't think of why they would want to bypass the EGR valve only in 5th
gear, unless they were getting EGR surge during a steady cruise and the EGR
is electronically modulated instead of vacuum modulated. The rev limiter
theory makes a little more sense, but again, limiting revs is usually more
important in lower gears where someone is more likely to miss a gear, and
rev limiters are usually more dependent on throttle position than selected
gear.
--

Ray O
(correct punctuation to reply)
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

On Wed, 20 Feb 2008 22:28:33 -0600, Ray O wrote:

>
> "Hachiroku ????" <Trueno DeleteThis @ae86.gts> wrote in message
> news:FT6vj.19780$eg3.3851@trndny05...
>> On Wed, 20 Feb 2008 21:27:40 -0600, Ray O wrote:
>>
>>
>>> "Hachiroku ????" <Trueno DeleteThis @ae86.gts> wrote in message
>>> news:si5vj.15582$MY2.832@trndny07...
>>>> On Thu, 21 Feb 2008 00:56:37 +0000, Jeff wrote:
>>>>
>>>>> Hachiroku ???? wrote:
>>>>>> 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?
>>>>>
>>>>> Why is this in a toyota newsgroup?
>>>>
>>>>
>>>> I forgot. You don't know anything about cars.
>>>>
>>>> At all.
>>>>
>>>>
>>> If it is near the shifter opposite the reverse switch, I'd guess
>>> neutral safety switch.
>>
>> Oh, no. In the manual it does say 5th gear switch, but doesn't say
>> anything about what it does.
>>
>> I did find a couple web sites; two said it bypasses the EGR valve, and a
>> Nissan site said it cuts in a rev limiter (the guy was going to wire a
>> momentary switch on the clutch pedal to have the rev limiter on all the
>> time when he presses the clutch...I thought I was a geek...)
>>
>>
> Hmmm, are there 3 switches on the tranny - reverse lights, neutral safety
> switch, and 5th gear switch?

Only two, afaik. 5-speed manual, safety switch at the clutch pedal...


>
> I can't think of why they would want to bypass the EGR valve only in 5th
> gear, unless they were getting EGR surge during a steady cruise and the
> EGR is electronically modulated instead of vacuum modulated. The rev
> limiter theory makes a little more sense, but again, limiting revs is
> usually more important in lower gears where someone is more likely to miss
> a gear, and rev limiters are usually more dependent on throttle position
> than selected gear.

From what I have seen, it seems they shut the EGR down. Probably for two
reasons; first, if you're in 5th your probably running in the engine's
most efficient range and emissions are nil, and/or shutting it off gets
better fuel economy and a bit more response. I know the last part because...

er, let's see...1987-2008=21 years. Past Statute of Limitations? ...

I bypassed the EGR on a new '87 Corolla. Thing had a miss right around 45
MPH and that cured it!!! It was a carb'd model and just didn't have the
response of the Hachiroku!!!
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

"Hachiroku ????" <Trueno.TakeThisOut@ae86.gts> wrote in message
news:1Vovj.9084$zo3.481@trndny04...
> On Wed, 20 Feb 2008 22:28:33 -0600, Ray O wrote:
>
>>
>> "Hachiroku ????" <Trueno.TakeThisOut@ae86.gts> wrote in message
>> news:FT6vj.19780$eg3.3851@trndny05...
>>> On Wed, 20 Feb 2008 21:27:40 -0600, Ray O wrote:
>>>
>>>
>>>> "Hachiroku ????" <Trueno.TakeThisOut@ae86.gts> wrote in message
>>>> news:si5vj.15582$MY2.832@trndny07...
>>>>> On Thu, 21 Feb 2008 00:56:37 +0000, Jeff wrote:
>>>>>
>>>>>> Hachiroku ???? wrote:
>>>>>>> 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?
>>>>>>
>>>>>> Why is this in a toyota newsgroup?
>>>>>
>>>>>
>>>>> I forgot. You don't know anything about cars.
>>>>>
>>>>> At all.
>>>>>
>>>>>
>>>> If it is near the shifter opposite the reverse switch, I'd guess
>>>> neutral safety switch.
>>>
>>> Oh, no. In the manual it does say 5th gear switch, but doesn't say
>>> anything about what it does.
>>>
>>> I did find a couple web sites; two said it bypasses the EGR valve, and a
>>> Nissan site said it cuts in a rev limiter (the guy was going to wire a
>>> momentary switch on the clutch pedal to have the rev limiter on all the
>>> time when he presses the clutch...I thought I was a geek...)
>>>
>>>
>> Hmmm, are there 3 switches on the tranny - reverse lights, neutral safety
>> switch, and 5th gear switch?
>
> Only two, afaik. 5-speed manual, safety switch at the clutch pedal...
>
>
>>
>> I can't think of why they would want to bypass the EGR valve only in 5th
>> gear, unless they were getting EGR surge during a steady cruise and the
>> EGR is electronically modulated instead of vacuum modulated. The rev
>> limiter theory makes a little more sense, but again, limiting revs is
>> usually more important in lower gears where someone is more likely to
>> miss
>> a gear, and rev limiters are usually more dependent on throttle position
>> than selected gear.
>
> From what I have seen, it seems they shut the EGR down. Probably for two
> reasons; first, if you're in 5th your probably running in the engine's
> most efficient range and emissions are nil, and/or shutting it off gets
> better fuel economy and a bit more response. I know the last part
> because...
>
> er, let's see...1987-2008=21 years. Past Statute of Limitations? ...
>
> I bypassed the EGR on a new '87 Corolla. Thing had a miss right around 45
> MPH and that cured it!!! It was a carb'd model and just didn't have the
> response of the Hachiroku!!!
>

In that case, I'd vote for the EGR theory.
--

Ray O
(correct punctuation to reply)
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

"OD" Overdrive light maybe ?



"Hachiroku ????" <Trueno RemoveThis @ae86.gts> wrote in message
news:Sr3vj.11226$wG2.5784@trndny09...
> 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?
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

On Sun, 24 Feb 2008 21:39:39 +0000, Jack McGann 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!



>
>
>
> "Hachiroku ????" <Trueno.TakeThisOut@ae86.gts> wrote in message
> news:Sr3vj.11226$wG2.5784@trndny09...
>> 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?
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

Hachiroku ハチロク wrote:
> On Sun, 24 Feb 2008 21:39:39 +0000, Jack McGann 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!
>
>

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
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

In article <Sr3vj.11226$wG2.5784@trndny09>, =?iso-2022-jp?q?Hachiroku_=1B$B%O%A%m%=2F=1B=28B?= wrote:
> 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?

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.
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

On Sun, 24 Feb 2008 23:40:06 GMT, Hachiroku ???? <Trueno.DeleteThis@AE86.gts>
wrote:

>On Sun, 24 Feb 2008 21:39:39 +0000, Jack McGann 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.

>
>
>>
>>
>>
>> "Hachiroku ????" <Trueno.DeleteThis@ae86.gts> wrote in message
>> news:Sr3vj.11226$wG2.5784@trndny09...
>>> 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?
 >> Stay informed about: WTH is a "5TH Gear Switch"? 

On Mon, 25 Feb 2008 10:39:44 -0600, Brent P wrote:

> In article <Sr3vj.11226$wG2.5784@trndny09>,
> =?iso-2022-jp?q?Hachiroku_=1B$B%O%A%m%=2F=1B=28B?= wrote:
>> 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?
>
> 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.


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!)
 >> Stay informed about: WTH is a "5TH Gear Switch"?