Tachometer is under reading
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This area is dedicated to technical discussions concerning SW20's. Please try to spell correctly because this will help people find information later if they are using search functionality. If you need assistance with your car and want to host a spanner day, please use the appropriate section of the forum: http://mr2.org.nz/phpbb3/viewforum.php?f=35 Thank you.
This area is dedicated to technical discussions concerning SW20's. Please try to spell correctly because this will help people find information later if they are using search functionality. If you need assistance with your car and want to host a spanner day, please use the appropriate section of the forum: http://mr2.org.nz/phpbb3/viewforum.php?f=35 Thank you.
- GDII
- Forum Moderator - MR2OCNZ
- Posts: 5719
- Joined: Sun Jul 10, 2011 5:13 pm
- Stomping Ground: Wellington
- Prime Mover: SW20
- First name: Phill
Re: Tachometer is under reading
I'm surprised I didn't manage to get any photos of the negative stripe on the capacitors when I took the tacho out to grab to photos. I have one of the circuit board but that isn't much help. Unless someone has a gauge cluster sitting around they can look at, I'll go back and pull mine out of the car again to grab more info.
1990 SW20 MR2 G-Limited (GEN4 3SGTE Installed)
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
- GDII
- Forum Moderator - MR2OCNZ
- Posts: 5719
- Joined: Sun Jul 10, 2011 5:13 pm
- Stomping Ground: Wellington
- Prime Mover: SW20
- First name: Phill
Re: Tachometer is under reading
I took my Tacho out again last night to grab some photos. I had to remove the dash again to check some of the light bulbs anyway. I will edit this post later with the photos showing the negative pins and circuit so you can put them in the right way.
Photos showing the negative pin of the capacitors.
Negative of the top capacitor. Negative of the bottom capacitor. This shows the PCB. Marked in red are the negative pins of each capacitor.
Photos showing the negative pin of the capacitors.
Negative of the top capacitor. Negative of the bottom capacitor. This shows the PCB. Marked in red are the negative pins of each capacitor.
Last edited by GDII on Sat Jul 15, 2017 5:30 pm, edited 2 times in total.
1990 SW20 MR2 G-Limited (GEN4 3SGTE Installed)
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
- Benckj
- Forum Moderator - MR2OCNZ
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- Prime Mover: More than one MR2
- First name: Jim
Re: Tachometer is under reading
Wonder if you could also do a short write up on LED conversion for the dash lights. Been meaning to do this for a few years now but never found the time.
Jim Benck
90 rev 1 parts car
98 rev 5 GT- all the mods
90 rev 1 parts car
98 rev 5 GT- all the mods
- GDII
- Forum Moderator - MR2OCNZ
- Posts: 5719
- Joined: Sun Jul 10, 2011 5:13 pm
- Stomping Ground: Wellington
- Prime Mover: SW20
- First name: Phill
Re: Tachometer is under reading
What did you have in mind? If you get the correct LEDs (wattage and physical size) that fit the standard bulb fittings you can change most of them with no issues. I think some bulbs can't be replaced as the cause issues.
This seems to show a how to anyway. http://www.mr2.com/forums/threads/29633 ... ster-Bulbs
This seems to show a how to anyway. http://www.mr2.com/forums/threads/29633 ... ster-Bulbs
1990 SW20 MR2 G-Limited (GEN4 3SGTE Installed)
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
-
- Guest of the Club.
- Posts: 1
- Joined: Mon Aug 29, 2016 12:19 pm
- Stomping Ground: Auckland
- Prime Mover: SW20
- First name: Jim
Re: Tachometer is under reading
Hi guys, I just repaired this problem on my 1990 MR2 SW20, thanks to your post here. Marvelous, one of the capacitor legs appeared to be completely corroded away. The photo marking the negative contacts was particularly helpful, made soldering in the new capacitors a cinch. (Jaycars gave me 16 V, though I asked for 25V).
Thanks again - had the problem diagnosed within 5 minutes of sitting down at the computer to google this under-reading tacho thanks to you guys!
Thanks again - had the problem diagnosed within 5 minutes of sitting down at the computer to google this under-reading tacho thanks to you guys!
- Crawls
- Executive Officer - MR2OCNZ
- Posts: 330
- Joined: Wed Jan 11, 2017 10:23 pm
- Stomping Ground: Hawkes Bay
- Prime Mover: SW20
- First name: Keith
Re: Tachometer is under reading
I just done this on my MR, and I turned the key on and the needle went to 1000rpm. But car wasn't going, did I solder one in wrong or put needle in wrong place haha
Keith "Crawls" Crawley
Membership Officer & Hawkes Bay Area Coordinator
90 SW20 n/a (Repairing)
18 Fortuner (Current)
92 SW20 (Current)
https://www.instagram.com/keith_crawley
Membership Officer & Hawkes Bay Area Coordinator
90 SW20 n/a (Repairing)
18 Fortuner (Current)
92 SW20 (Current)
https://www.instagram.com/keith_crawley
- GDII
- Forum Moderator - MR2OCNZ
- Posts: 5719
- Joined: Sun Jul 10, 2011 5:13 pm
- Stomping Ground: Wellington
- Prime Mover: SW20
- First name: Phill
Re: Tachometer is under reading
Did you take the needle off when you did this?creepie01 wrote:I just done this on my MR, and I turned the key on and the needle went to 1000rpm. But car wasn't going, did I solder one in wrong or put needle in wrong place haha
1990 SW20 MR2 G-Limited (GEN4 3SGTE Installed)
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
- Crawls
- Executive Officer - MR2OCNZ
- Posts: 330
- Joined: Wed Jan 11, 2017 10:23 pm
- Stomping Ground: Hawkes Bay
- Prime Mover: SW20
- First name: Keith
Re: Tachometer is under reading
Ah yes I did. Do I power up tacho then put needle at zero
Keith "Crawls" Crawley
Membership Officer & Hawkes Bay Area Coordinator
90 SW20 n/a (Repairing)
18 Fortuner (Current)
92 SW20 (Current)
https://www.instagram.com/keith_crawley
Membership Officer & Hawkes Bay Area Coordinator
90 SW20 n/a (Repairing)
18 Fortuner (Current)
92 SW20 (Current)
https://www.instagram.com/keith_crawley
- GDII
- Forum Moderator - MR2OCNZ
- Posts: 5719
- Joined: Sun Jul 10, 2011 5:13 pm
- Stomping Ground: Wellington
- Prime Mover: SW20
- First name: Phill
Re: Tachometer is under reading
No need to take the needle off to do this fix. But to fix that I guess this will be the best way.
If you aren't sure if it's then correct ask for some RPM vs speedo readings from some other users.
If you aren't sure if it's then correct ask for some RPM vs speedo readings from some other users.
1990 SW20 MR2 G-Limited (GEN4 3SGTE Installed)
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
- Crawls
- Executive Officer - MR2OCNZ
- Posts: 330
- Joined: Wed Jan 11, 2017 10:23 pm
- Stomping Ground: Hawkes Bay
- Prime Mover: SW20
- First name: Keith
Re: Tachometer is under reading
Thanks mate. Kinda new to this
Keith "Crawls" Crawley
Membership Officer & Hawkes Bay Area Coordinator
90 SW20 n/a (Repairing)
18 Fortuner (Current)
92 SW20 (Current)
https://www.instagram.com/keith_crawley
Membership Officer & Hawkes Bay Area Coordinator
90 SW20 n/a (Repairing)
18 Fortuner (Current)
92 SW20 (Current)
https://www.instagram.com/keith_crawley
- GDII
- Forum Moderator - MR2OCNZ
- Posts: 5719
- Joined: Sun Jul 10, 2011 5:13 pm
- Stomping Ground: Wellington
- Prime Mover: SW20
- First name: Phill
Re: Tachometer is under reading
Fair enough. Feel free to ask any questions here if you are unsure of anything.
1990 SW20 MR2 G-Limited (GEN4 3SGTE Installed)
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/
2000 AE111R Corolla Wagon NZ New Daily
1996 AE101R Corolla Sprint NZ New Selling Soon
1990 EP81 Starlet XL (Sold)
1990 EE90 Corolla XL (Sold)
Instagram https://www.instagram.com/sw20glimited/