no rpm reading with Jimstim
#1
no rpm reading with Jimstim
I've nearly completed the build of my MS2E for a '00 with stock sensors.
All is working fine except that I can't get an rpm reading with the jimstim.
I'm using Abe's input circuits (on pin 24 and 25)
On the Jimstim, everything looks ok:
- dips are set for miata: 2,3,6 are on, others are off
- connected a jumper from 2nd trigger to pin 25 (IAC1A)
- primary tach jumper is in the bottom location, no other jumpers next to it
Basically like this:
On the MS I wired the 2nd trigger input to be fed from the IAC1A terminal (pin 25 of the DB37). I have continuity between Jimstim 2nd trigger pin and the input of Abe's circuit.
I can only assume this must be a software setting ?
I selected miata 99-00, falling edge, spark output going low, wasted spark, D14.
Anything else I need to set?
All is working fine except that I can't get an rpm reading with the jimstim.
I'm using Abe's input circuits (on pin 24 and 25)
On the Jimstim, everything looks ok:
- dips are set for miata: 2,3,6 are on, others are off
- connected a jumper from 2nd trigger to pin 25 (IAC1A)
- primary tach jumper is in the bottom location, no other jumpers next to it
Basically like this:
On the MS I wired the 2nd trigger input to be fed from the IAC1A terminal (pin 25 of the DB37). I have continuity between Jimstim 2nd trigger pin and the input of Abe's circuit.
I can only assume this must be a software setting ?
I selected miata 99-00, falling edge, spark output going low, wasted spark, D14.
Anything else I need to set?
#2
When I select EDIS, I do get a reading so I assume that my primary input is ok (CKP) but that my 2nd input (CMP) must has a problem.
I still haven't figured out if I need to do the CMP and CKP input mods on diy as these instructions are for a 90-97. I'm using Abe's input circuits.
Anyone?
I still haven't figured out if I need to do the CMP and CKP input mods on diy as these instructions are for a 90-97. I'm using Abe's input circuits.
Anyone?
Last edited by WestfieldMX5; 05-03-2009 at 11:35 AM.
#3
Boost Pope
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Abe's circuit is a substitute for the DIY circuit. One or the other, not both.
It does sound like a hardware problem. Possibly something trivial like a pullup. Eyeball the circuit, dude. That's all we can tell you.
It does sound like a hardware problem. Possibly something trivial like a pullup. Eyeball the circuit, dude. That's all we can tell you.
#5
I checked the circuits and I really think they are ok. I measure the same values on every point of both inputs circuits.
I didn't build the diy circuits, just Abe's.
With dip 6 off, I get some rpm reading. I can set the rpm with the pot and I get a corresponding rpm value in megaview, but the reading constantly drops to zero and back. Doesn't seem right.
I didn't build the diy circuits, just Abe's.
With dip 6 off, I get some rpm reading. I can set the rpm with the pot and I get a corresponding rpm value in megaview, but the reading constantly drops to zero and back. Doesn't seem right.
#6
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,455
Total Cats: 6,874
Might wanna check the PROM rev on your JimStim. Switches 2,3,6 on is the correct setting for '99-'05 Miata, but this was only added in the latest (2.0 firmware.
Last edited by Joe Perez; 05-04-2009 at 08:17 AM. Reason: '99, not '90.
#9
I found that the 2nd trigger output from the JimStim isn't working as it should.
Contacted Matt about this and apparently, some early JimStims had a problem with the Miata mode. I think I have one of them. Waiting for more info on this.
Edit:
Matt confirmed that the wheel pattern for the '99-up Miata was changed between the two-dot and three-dot versions of the JimStim. The two-dot processor had the wrong pattern. He's sending me an updated chip.
Contacted Matt about this and apparently, some early JimStims had a problem with the Miata mode. I think I have one of them. Waiting for more info on this.
Edit:
Matt confirmed that the wheel pattern for the '99-up Miata was changed between the two-dot and three-dot versions of the JimStim. The two-dot processor had the wrong pattern. He's sending me an updated chip.
Last edited by WestfieldMX5; 05-08-2009 at 05:51 PM.
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