'90+ carb guys CCM question
Thread Starter
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
'90+ carb guys CCM question
You guys with '90+ cars, who switched to Carb and tossed. the ECM. I'm curious, does the CCM still function the dash properly?
Also if the CCM does not get a valid vats resistance from the key, will it still function the dash and simply tell the ecm to "vats fail", or will it also go into security mode?
-- Joe
Also if the CCM does not get a valid vats resistance from the key, will it still function the dash and simply tell the ecm to "vats fail", or will it also go into security mode?
-- Joe
Thread Starter
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
I want to swap to a '90 dash. My car has no vats, its completly removed. I'd like to keep it that way. Lack of Vats will **** off the CCM.
Another issue, I'm not using a '727 ECM, and never will. I'm running a '749 with the typhoon code for my supercharger.
Another issue, the CCM I have available is from a '92 with matching LCD, so forget about even '727 ECM now we're talking LT1.
So I guess my question is, will the CCM not run the
LCD/speedo/everything with the lack of VATS and ECM communication, or will it be fine?
Or will it not work at all?
Or should I ditch the CCM and use my '87 dash harness, and just change all the connectors and wiring to use the '90 gauges (analog), HVAC controls and replace the LCD with an aftermarket speedo and fuel gauge?
Help!!
Thanks.
-- Joe
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
"So I guess my question is, will the CCM not run the
LCD/speedo/everything with the lack of VATS and ECM communication, or will it be fine? "
My understanding was the CCM is a interface between car systems and the ECM via the data link ; not the operator of the display , etc.
In my '90,I had the VATS disabled on the chip as you would do on a 165 and it ran fine so I don't think the CCM monitors the VATS.
I know the CCM does a check with the airbags and other systems , even radio if I recall FSM .
If not correct ,will display codes or not send start signal via data link to ECM , dependent apon what fault it sees..
On my '90 as soon as I disconnected the airbags , had no start despite all dash functions up. Had crank and ign but no injector driver Apparently a F-body bin will allow you to delete the CCM with Vette ECM as they don't have data link requirement
Trying to find my research info
LCD/speedo/everything with the lack of VATS and ECM communication, or will it be fine? "
My understanding was the CCM is a interface between car systems and the ECM via the data link ; not the operator of the display , etc.
In my '90,I had the VATS disabled on the chip as you would do on a 165 and it ran fine so I don't think the CCM monitors the VATS.
I know the CCM does a check with the airbags and other systems , even radio if I recall FSM .
If not correct ,will display codes or not send start signal via data link to ECM , dependent apon what fault it sees..
On my '90 as soon as I disconnected the airbags , had no start despite all dash functions up. Had crank and ign but no injector driver Apparently a F-body bin will allow you to delete the CCM with Vette ECM as they don't have data link requirement
Trying to find my research info
Thread Starter
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
"So I guess my question is, will the CCM not run the
LCD/speedo/everything with the lack of VATS and ECM communication, or will it be fine? "
My understanding was the CCM is a interface between car systems and the ECM via the data link ; not the operator of the display , etc.
In my '90,I had the VATS disabled on the chip as you would do on a 165 and it ran fine so I don't think the CCM monitors the VATS.
I know the CCM does a check with the airbags and other systems , even radio if I recall FSM .
If not correct ,will display codes or not send start signal via data link to ECM , dependent apon what fault it sees..
On my '90 as soon as I disconnected the airbags , had no start despite all dash functions up. Had crank and ign but no injector driver Apparently a F-body bin will allow you to delete the CCM with Vette ECM as they don't have data link requirement
Trying to find my research info
LCD/speedo/everything with the lack of VATS and ECM communication, or will it be fine? "
My understanding was the CCM is a interface between car systems and the ECM via the data link ; not the operator of the display , etc.
In my '90,I had the VATS disabled on the chip as you would do on a 165 and it ran fine so I don't think the CCM monitors the VATS.
I know the CCM does a check with the airbags and other systems , even radio if I recall FSM .
If not correct ,will display codes or not send start signal via data link to ECM , dependent apon what fault it sees..
On my '90 as soon as I disconnected the airbags , had no start despite all dash functions up. Had crank and ign but no injector driver Apparently a F-body bin will allow you to delete the CCM with Vette ECM as they don't have data link requirement
Trying to find my research info
-- Joe
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
