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Microtech LT12/20b issues

Old 09-09-05, 12:44 AM
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LTX12/20b issues

Ok. I have the car completly wired and everything minus the intercooler piping finished on the motor. All fluids toped off, fresh oil, filter, distilled water, everything I need.
Put in key, turn. It cranks!! Nothing from the MT though.... Find out my ignition source wire is bad, directly jumper it to the battery for testing.
I set the TPS and turn the key agaim, no fuel and no spark. I check the cas, even tear open the harness in desperation to check the wiring. Well I figure, its shot. I tear it out with a crowbar, its stuck in there so well!. I grab my spare TII cas and wiring, re wire it from the CAS connector to the MT harness. Wahoo! I have fuel! But no spark. I can hold the cas in my hand and turn the gear and Bzzzzz squirt, comes from each injector.
I restab the cas, timed correctly, and still get no spark. I figure bad grounds. Well that cant be. I have a 4 guage running from the starter bolt to the strut tower, sanded for good contact. I have a 8guage block/firewall ground, and a 8 guage UIM/firewall ground. I get desperate enough to run spare 4 guage directly to the battery -, from the engine block.
So I check voltage at the coil with my MM. 11.6v on the + side. I check the neg side, 11.6v. Is this right? I think so, the coils are fired by grounding them, so thats what the X6 ign box must do and why it has 2 ground wires comming from it. (These are mounted on the rear iron, along with the firewall ground).

I check the hand unit, I have 2 new errors.110.90aS and 210.90aS. Now I pulled the connections, cleaned them with a degreaser and put it back together. I dont know if they are from the new cas or old. But what do they mean? The error log reads OK all across the 2 screens.

So what am I missing guys? My grounds all are good, I have tripple checked my wiring, everything is soldered and heatshrunk by myself. Is this a CAS issue? Cas grounding issue? Something I have forgoten to setup?

Oh! Under cranking is reads CRK-rpm instead of 0000rpm. Either that or is flashes 0250rpm. Also! When I put my foot down on the gas, the TPS reads but the rpm also reads CRKrpm. And it reads 00BTDC.

Sorry if this is confusing or long winded, im very tired.

Last edited by The Spyder; 09-09-05 at 01:13 AM.
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Old 09-09-05, 01:25 AM
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Ok, I just read through mabey... 100 threads....
So I am going to TRIPPLE check my cas wiring and try again tommorow.
I know why the screen reads 00BDC, I havent locked the timing.
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Old 09-09-05, 05:47 PM
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Fixed it. Soldered the MT wiring directly to the cas. Screw that 4pin plug. It was all my problems.

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Old 10-02-05, 11:24 PM
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To maybe help me with my problem, how would the ecu see rpm and fire only the injectors and not the spark? Wouldnt nothing happen, or all happen? Thanks for shinning light on it.
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