95.5 MS1 // No Dash Tach and CEL
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Braineack built MS (originally made for a 1.6). Parallel install (for now).
Finally got it installed and the car idling but my tach on the cluster isn't working. From searching I figured out I have a 3 wire coil pack and thus a 95.5 and will probably need a tach driver circuit.
Does this get built in the proto area? Anybody have pics of their board? How does it get wired to the DB37 / harness? Do I need to run a wire from my guage cluster to the MS?
Also I have a constantly illuminated CEL since installing the MS. I'm not using a MAF and I ran wires directly from the AIT to the factory harness. Any ideas? I haven't really researched the CEL yet....
Finally got it installed and the car idling but my tach on the cluster isn't working. From searching I figured out I have a 3 wire coil pack and thus a 95.5 and will probably need a tach driver circuit.
Does this get built in the proto area? Anybody have pics of their board? How does it get wired to the DB37 / harness? Do I need to run a wire from my guage cluster to the MS?
Also I have a constantly illuminated CEL since installing the MS. I'm not using a MAF and I ran wires directly from the AIT to the factory harness. Any ideas? I haven't really researched the CEL yet....
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if parallel, the stock ECU should still be providing the tach output...
read what the CEL is, even when using the GM AIT, if it's going back to the stock ECU it should be happy enough not to throw a CEL from it.
read what the CEL is, even when using the GM AIT, if it's going back to the stock ECU it should be happy enough not to throw a CEL from it.
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Crap...so I need to look at my harness? I'm tempted to send the whole thing to you for a once over, but I really want to drive this damned car....
I was also wondering, Shouldn't the stock ECU control idle? At first, my AIT wasn't hooked up and it ran like crap until I fixed the connection. Also the idle hunts badly when the fans come on. You built it as a parallel but with the fans mod. Am I still able to allow the stock ECU to control that or do I have to control fans with the MS since it has that mod?
I was also wondering, Shouldn't the stock ECU control idle? At first, my AIT wasn't hooked up and it ran like crap until I fixed the connection. Also the idle hunts badly when the fans come on. You built it as a parallel but with the fans mod. Am I still able to allow the stock ECU to control that or do I have to control fans with the MS since it has that mod?
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Yes, there is a wire at 2I and it goes straight to the ECU. Sooo, Whiskey Tango Foxtrot....?
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OK, Google just found this for me, even though I never saw it when searching this site.
https://www.miataturbo.net/megasquirt-18/mspnp-installed-what-happened-my-tach-18670/
Looks like it might be on 1F on the 95.5 cars. Still not clear on the solution though.
https://www.miataturbo.net/megasquirt-18/mspnp-installed-what-happened-my-tach-18670/
Looks like it might be on 1F on the 95.5 cars. Still not clear on the solution though.
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Running the IAT through the stock MAF plug and leaving the MAF unhooked will throw a constant CEL if you're parallel, on 1.8 cars anyway. It bothered me so I cut the wire to the CEL in my adapter harness. On a 94 it's 1C (yel/blk) but double-check for yours.
If you want the CEL to come on with ignition and cranking then go off during run (say, to satisfy a state inspection requirement) then you can jump two wires on a connector behind the glove box. FM has the instructions for this buried within the Link tuning manual .pdf on their site. Recent thread about it here: https://www.miataturbo.net/megasquirt-18/cel-circuit-58696/
If you want the CEL to come on with ignition and cranking then go off during run (say, to satisfy a state inspection requirement) then you can jump two wires on a connector behind the glove box. FM has the instructions for this buried within the Link tuning manual .pdf on their site. Recent thread about it here: https://www.miataturbo.net/megasquirt-18/cel-circuit-58696/
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