Trouble getting shift light function to work - LED output

[TouringBubble]

I was hoping for some direction on this issue. I've read up in several different places but have found no answers to some basic questions.

I'm trying to set the function of the Accel LED on my MS2 v3 to send a signal for a shift light. I'm attempting to test this on the bench using the standard LED setup before modifying the board to send the signal to the harness. I'm currently running the standard firmware (2.905 I think) but plan to run MS2Extra eventually. I'm trying to test everything before changing the setup.

First, is it possible to test this using the standard LED configuration? Or, do I have to jumper the board to test?

When setting the output to trigger at RPM > 6000 I can only get a brief flash of the LED around the trigger point. I've modified the hysteresis in a few different ways but all have the same result, or nothing at all. From what I gather from reading, the hysteresis for the RPM should be just below the trigger point, correct? I've seen some setups leave the hysteresis at 50 or so, which confuses me. I assumed that if the trigger was RPM > 6000 the hysteresis would be something like 5950, and when the RPM fell below 5950 the signal would cut. Is this correct, or am I not thinking about it correctly?

No matter what I've set the spare outputs to, the LEDs always seem to continue their standard function. In the example of the Accel LED, I can set that output for a shift light, but it still triggers when the TPS in increased. Is this how it is supposed to function?

For wiring the output to my harness, I simply remove the existing LED and jumper the ground of the output (square pad for the LED, marked with "-") to the pin on the DB37 I want to use, right? Then, I run 12v to my shift light assembly (which is set up to run on 12v standalone) and connect the ground from the shift light assembly to the output I connected to on the DB37? Just trying to make sure I've got this.

I really do appreciate any help you can give on this. I tried to get this to work for a few hours last night and got nowhere.

[Matt Cramer]

That ought to work OK with the standard LED. Could you please post a copy of your MSQ file?

[TouringBubble]

Will do this afternoon. Thanks.

[TouringBubble]

Here is my MSQ. Just the standard base file with changes for EDIS and idle.

[TouringBubble]

When looking around the TunerStudio MS directory trying to find my MSQ file, I noticed that it seemed to be located in the MS2Extra directory. Could that be the issue? Does the newer version of TunerStudio assume that I've got MS2 Extra? I didn't see any option to change that other than the definition area, which seemed to be correct showing 2.90.

[Matt Cramer]

That MSQ is not for Extra code - it's from Bowling & Grippo firmware.

Those settings should work. Check the voltage on the resistor going into the LED's control transistor - see if that stays on or goes away quickly.

[TouringBubble]

Would that be R29 or R29 for Q8/D16?

Do you have any info about my other questions? Will the circuit keep it's original purpose (Accel LED) or should the new settings "overwrite" the original use of the indicator? Are my thoughts on wiring correct?

[TouringBubble]

Alright ... so, I connected the Megasquirt just a sec ago to test the voltage as you asked. I double checked my settings for the shift light and the general settings and some communication stuff. Suddenly, it works. I guess there is some step to writing to the ECU that I'm missing that happened when I was testing everything.

Either way, now the shift light works as intended and the accel trigger is gone as expected. I've got 5v at the resistor with no signal and around 2.5 over 6000 RPM where the light is triggered.

Now, just to read up on why my injectors are cutting off over 6500 RPM ...

EDIT :: Nevermind on the injectors ... I should know how a rev limit works, shouldn't I?

[siggy_freud]

Now, just to read up on why my injectors are cutting off over 6500 RPM ...

EDIT :: Nevermind on the injectors ... I should know how a rev limit works, shouldn't I?

Lol . Least you figured it out pretty quick.