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Old 11-26-2011, 05:25 PM   #1
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Default LC1 wiring

LC1 gauge not reading right. It stays at a constant 10.1. Not 100% sure that the ms is reading the Wide band correct.

The car does run and drive. just not very good at this point. I think i could maybe even leave it the way it is and be fine .. but does not seem right to me.

I have done a lot of reading and still confused. I want to start with looking at my wiring. I am confident that my wiring is right except for the grounding points.

Here is how I am wired at this point.

1. Blue and White ground to the ECU ground point. Solder to a single ring connector.

2. Gauge ground solder to a ring connector to the ECU ground point.

3. Test button ground solder to a single ring connector to the ECU point.

This seems like to many grounds at one point. the directions state "1. The BEST grounding scheme is all grounds (i.e., ECU, Gauges, LC1 heater, LC1
system, etc.) SOLDERED into a single lug and bolted to the engine block."

I wanted the opinion of others who have done this as to the best set up. i do not mind doing one lug and using the ECU ground point. I still think that is a lot of grounds to one point.

My thinking is to ground the blue and white to the ecu on the one ring.

then ground the gauge and test button to a point on the frame.

I have also read that having the gauge ground at a different point is not good.

i defiantly think getting rid of the test ground is a good idea and just ground it to the frame.

Choices.

1. leave it like it is on different rings and use the one ground.

2. Blue, White, Gauge solder to one ring and use the ECU ground. then ground the test ground to the frame.

3. Blue white to the same ring and to the ecu ground. Gauge and test ground to ground on the frame.

4. "Stupid Noob you should do none of those and do it this way" Fill in the best way to do it.


I have read many posts on this and I am still confused.
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Old 11-26-2011, 10:39 PM   #2
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Quote:
Originally Posted by zeroox View Post
LC1 gauge not reading right. It stays at a constant 10.1. Not 100% sure that the ms is reading the Wide band correct.
This sounds less like a grounding problem and more like a configuration problem. If you never changed the output config in LM Programmer, one of the outputs is simulating a narrowband sensor because that's how it left the factory. That means a range of 0-1V, and if MS is expecting to see a wideband signal it will be reading rich.

Have you connected to the LC-1 with the LM Programmer software and verified that both outputs are configured properly? For the DB dash gauge you want 0-5V = 0.5 to 1.5 lambda. The output to the megasquirt can be set the same or to 0-5V = 10 to 20 AFR. Whichever range you choose, make sure it's configured the same with LM Programmer and in megatune/tunerstudio.
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Old 11-26-2011, 10:44 PM   #3
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I will check my settings tomorrow. i plan on doing the wiring over and open air calibrate the wide band..might as well check the settings again.
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Old 11-27-2011, 05:46 AM   #4
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Key on and engine off, do you get a reading close to 20:1? Or 10:1 all the time?
If constant, the gauge reads 10:1 when its input receives 0V. If this is the cae, you need to check the analog output on the LC1 for a proper connection to the gauge and proper configuration.
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