MegaSquirt CEL popped on?

afjLX · Dec 29, 2024

So something weird occurred this morning when I started the car. The Check Engine Light came on and stayed on. So would the MS trigger a CEL? I didn’t think it would??
Is there a way to look up sensors to see if I have an issue all of a sudden?

I’m using the MegaSquirt V2 for Fox Mustangs.

AeroCoupe · Dec 29, 2024

From my understanding it will not. I have never seen this but thought it was worth mentioning in the rare case the previous owner did this to pass emissions:

Installing MegaSquirt in Parallel With the Stock ECU

While there are many cars where MegaSquirt can completely replace the stock ECU, on some cars you’ll need to leave the stock ECU in place. There’s several reasons why you might want to do this. On some installations, you might want to have the MegaSquirt control just the fuel and would rather...

www.diyautotune.com

From what I have read most states that still do emissions checks on the 95 and down cars only look for the CEL to come on when the key is put in the run position and then to go out in 3-5 seconds. Would be easier to wire it to a timer than to parallel the two ECU’s.

Noobz347 · Dec 29, 2024

This is why progress threads are so handy.

A Progress Thread contains [all] the ailments of your car in one thread.

This and some of the issues in your other threads may be related.

Mustang5L5 · Jan 3, 2025

Yes, you can enable a CEL with Tuner studio that will trigger the check engine light. It doesn't quite work like a normal check engine light.

The menu for it is under "Canbus/Test Modes"

Under "Light output" you can see what pin on the MS it's wired to the output of.

As you can see, what you are really doing is setting MAX/MIN specs for various sensors. If it ventures outside that range, it will trigger a CEL.

afjLX · Jan 3, 2025

Mustang5L5 said:
Yes, you can enable a CEL with Tuner studio that will trigger the check engine light. It doesn't quite work like a normal check engine light.

The menu for it is under "Canbus/Test Modes"

Under "Light output" you can see what pin on the MS it's wired to the output of.

As you can see, what you are really doing is setting MAX/MIN specs for various sensors. If it ventures outside that range, it will trigger a CEL.

Thank you!! I will check it today!

Noobz347 · Jan 3, 2025

So, you can set your own. That's pretty nice.

afjLX · Jan 3, 2025

Mustang5L5 said:
Yes, you can enable a CEL with Tuner studio that will trigger the check engine light. It doesn't quite work like a normal check engine light.

The menu for it is under "Canbus/Test Modes"

Under "Light output" you can see what pin on the MS it's wired to the output of.

As you can see, what you are really doing is setting MAX/MIN specs for various sensors. If it ventures outside that range, it will trigger a CEL.

Well, I’m unable to find anything in tuner studios for light output or check engine light under canbus. I’m using a MegaSquirt gen2.

Mustang5L5 · Jan 3, 2025

Which version of TS are you on?

Is this the ECU you have?

MSPNP2 Gen 2 Ford 86-93 Foxbody Mustang 5.0

Ford FoxBody Mustang PNP ECU - MSPNP Gen2 Plug and Play for the 1986-1993 Ford Mustang 5.0 and 1986-1988 Thunderbird 5.0, installs in under 1 hour.

www.diyautotune.com

afjLX · Jan 3, 2025

Mustang5L5 said:
Which version of TS are you on?

Is this the ECU you have?

MSPNP2 Gen 2 Ford 86-93 Foxbody Mustang 5.0

Ford FoxBody Mustang PNP ECU - MSPNP Gen2 Plug and Play for the 1986-1993 Ford Mustang 5.0 and 1986-1988 Thunderbird 5.0, installs in under 1 hour.

www.diyautotune.com

Yep that’s the one I’m running. I’m using TunerStudio MS Ultra v3.2.05

Mustang5L5 · Jan 4, 2025

afjLX said:
Yep that’s the one I’m running. I’m using TunerStudio MS Ultra v3.2.05

Let me dig around a bit. Did you do the initial setup and tune?

afjLX · Jan 4, 2025

Mustang5L5 said:
Let me dig around a bit. Did you do the initial setup and tune?

Yep, sure did.

Mustang5L5 · Jan 6, 2025

SO you do not have this menu under this header at all?

afjLX · Jan 7, 2025

Mustang5L5 said:
SO you do not have this menu under this header at all?

I have that pulldown but the check engine light option is not there.

Noobz347 · Jan 7, 2025

There must be a switch somewhere

Mustang5L5 · Jan 7, 2025

I'm on TS MS Lite v3.2.05 and it's there. Not sure why it would be missing from yours.

Noobz347 · Jan 7, 2025

Mustang5L5 said:
I'm on TS MS Lite v3.2.05 and it's there. Not sure why it would be missing from yours.

Is there a way to enable/disable the option, by chance?

Mustang5L5 · Jan 7, 2025

Noobz347 said:
Is there a way to enable/disable the option, by chance?

You can turn it on/off but it’s within that particular menu itself.

Noobz347 · Jan 7, 2025

Check this for Esses and Geez:

If you don't see the Check Engine Light option:

Ensure Advanced Menus Are Enabled:
- Go to Options > Preferences.
- Set the interface level to Advanced.

afjLX · Jan 7, 2025

Noobz347 said:
Check this for Esses and Geez:

If you don't see the Check Engine Light option:

Ensure Advanced Menus Are Enabled:

Go to Options > Preferences.

Set the interface level to Advanced.

I will try that when I get home tomorrow. Will report back then.

Gibson17 · Jan 12, 2025

I too am interested in this. I have the MSPNP2 in my foxbody and MS Ultra v3.2.05 and under options>preferences there is no Advanced Menu eneable option.

MegaSquirt CEL popped on?

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