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'7730 ECM w/DIS Code 41 by lou_dias
Started on: 09-11-2024 05:18 PM
Replies: 13 (180 views)
Last post by: lou_dias on 10-11-2024 01:37 PM
lou_dias
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Report this Post09-11-2024 05:18 PM Click Here to See the Profile for lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post
Does anyone have experience with a CODE 41 using the '7730 ECM ?
I'm running DIS with the DR-145 ICM.

I've swapped the ICM multiple times, the ECM once, and the crank sensor.

I've checked continuity between the timing control output on pin 8 of the 32 pin ECM connector and the connector 3 pint B on the ICM and it checked good.
https://easyautodiagnostics...crank-sensor?start=1

I am at a loss. My next step is to reflash the EPROM. This is a possibility since it happened after I burned new code.
According to this list it could be a memcal error:
https://www.slideshare.net/...s-list-pdf/250729747

[This message has been edited by lou_dias (edited 09-11-2024).]

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lou_dias
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Report this Post09-18-2024 03:22 PM Click Here to See the Profile for lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post
Update.

Ordered a new MEMCAL and adapter.

Per the Code 41 docs in the N1A$T definition, it seems this has to do with resistors that determine the fueling method not matching what's defined in my .bin file.
Nothing has changed, however there are some signs of rust on my adapter so I'm just ordering new parts.

Apparently the adapter is from Red Devil. My old one was from Moates.
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Daviero
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Report this Post09-22-2024 08:41 PM Click Here to See the Profile for DavieroSend a Private Message to DavieroEdit/Delete MessageReply w/QuoteDirect Link to This Post
I used a 7730 years ago to run my Northstar but after difficulties switched to a 1227165 ECM with a memcal replacement board from PCM Hacking from Australia. It’s a generation older ECM than the 7730 but with the RAM memory adaptor it is a more powerful setup. You can read and write directly to the ECM though the ALDL port, even running live, all just with TunerPro Live. Fuel and timing charts extend to 7500 rpm too so there no adder charts to deal with, and you can have it set up for 2 fuels, or two tunes, with the installation of a selector switch. Do a search on Pennocks here and you’ll find a few threads of its use. Hope you find this useful.


------------------
Daviero - 88 N* 5spdGT

[This message has been edited by Daviero (edited 09-22-2024).]

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lou_dias
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Report this Post09-23-2024 11:13 AM Click Here to See the Profile for lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks for the info.
I will keep that in mind for future swaps.

Looking at my adapter, there's some build up on the pins. I think that may be causing the issue. I could probably just clean it. I probably bought all this hardware in 2009 so it's old...and getting crusty I guess.

Red Devil River didn't print a shipping label until last night. :/
I've had the spare memcal since last week now from a different ebay vendor.

I don't want to risk using this new memcal with the old adapter to avoid the old adapter causing an electrical issue with it.
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lou_dias
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Report this Post09-25-2024 09:14 AM Click Here to See the Profile for lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post
https://tools.usps.com/go/T...00108105465522836579

https://www.ebay.com/itm/116179518972

This is despicable at this point. I paid on the 16th. Asked for an update. Still no message. Just a shipping label created.


I am about ready to clean my current adapter and cancel this order.
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jdv
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Report this Post10-06-2024 02:45 PM Click Here to See the Profile for jdvSend a Private Message to jdvEdit/Delete MessageReply w/QuoteDirect Link to This Post
I tried nAst1 years ago but switched to a different ecm as I could not get good results. This code has not been supported since 2017. This flag should be able to turned off in the flags section if it is not causing any issues.
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Patrick
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Report this Post10-06-2024 04:59 PM Click Here to See the Profile for PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by lou_dias:

This is despicable at this point. I paid on the 16th. Asked for an update. Still no message. Just a shipping label created.


Lou, I don't know if you're aware of this, but unfortunately phonedawgz (Red Devil River) has a history of non-communication... as reported Here and Here. It's a shame that this type of issue continues to crop up with him on occasion.
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lou_dias
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Report this Post10-06-2024 05:07 PM Click Here to See the Profile for lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post
I think it's a legit code. The timing is not being advanced.

I've replaced everything I can replace. Tomorrow, I am going to check continuity on the 2 wires that go from the ICM to the crank sensor on the advice of La Fiera.
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lou_dias
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Report this Post10-06-2024 05:28 PM Click Here to See the Profile for lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post

lou_dias

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quote
Originally posted by Patrick:

Lou, I don't know if you're aware of this, but unfortunately phonedawgz (Red Devil River) has a history of non-communication... as reported Here and Here. It's a shame that this type of issue continues to crop up with him on occasion.


Yeah I am trying to recover my money...
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Report this Post10-06-2024 05:43 PM Click Here to See the Profile for jdvSend a Private Message to jdvEdit/Delete MessageReply w/QuoteDirect Link to This Post
Tomorrow, I am going to check continuity on the 2 wires that go from the ICM to the crank sensor on the advice of La Fiera.
They should be a twisted pair or have a third wire that is grounded on one end. Is your memcal from a v6?
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lou_dias
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Report this Post10-07-2024 08:19 AM Click Here to See the Profile for lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by jdv:

Tomorrow, I am going to check continuity on the 2 wires that go from the ICM to the crank sensor on the advice of La Fiera.
They should be a twisted pair or have a third wire that is grounded on one end. Is your memcal from a v6?


It's a twisted pair. The connector on the ICM side is a 3 wire with 1 wire missing. Yes, my memcal is from a V6.

[This message has been edited by lou_dias (edited 10-07-2024).]

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Report this Post10-10-2024 06:41 PM Click Here to See the Profile for lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post
Things are starting to add up.

I am using the expensive ICM. So I assume it was not the issue...
However, I've had 3 or 4 bad ICM's now...

But why?

My stock battery gauge is reading 16+ volts. I'm starting to believe that perhaps I am over-volting the ICMs and one thing or another is internally failing after a week or so of use.

Hopefully I can get a warranty replacement tomorrow that works [temporarily] and can race on Saturday.
I'll replace the alternator later...
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Report this Post10-10-2024 06:57 PM Click Here to See the Profile for PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by lou_dias:

My stock battery gauge is reading 16+ volts. I'm starting to believe that perhaps I am over-volting...


I wouldn't trust the car's battery gauge/voltmeter. You must have a standalone multimeter?

[This message has been edited by Patrick (edited 10-10-2024).]

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lou_dias
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Report this Post10-11-2024 01:37 PM Click Here to See the Profile for lou_diasSend a Private Message to lou_diasEdit/Delete MessageReply w/QuoteDirect Link to This Post
I find the voltage issue reading 20% higher may explain why my rpm gauge and oil pressure generally read 20% higher...same with my temp gauge... I'd imagine whatever circuitry that produces a 5v signal expecing 13.2v may convert a 16+v signal to 6+ volts...
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