CPS to ECU home run

[Duncan Moody]

Looking for details on how to do a home run from CPS to ECU.  1989 4.0 AT.  I have no C101.  Is it a matter of tracing the wire colors (or continuity) from CPS back to ECU, run new wires through fire wall, then cut and solder at the ECU connector?  I could not find ECU connector diagram identifying the CPS connections.

[cruiser54]

TSB 18-51-88  There's a factory bulletin on doing that.

 

 

CPS Bypass TSB

 

[Duncan Moody]

Thanks!!

[Salvagedcircuit]

On 1/8/2024 at 4:53 AM, cruiser54 said:

TSB 18-51-88  There's a factory bulletin on doing that.

 

 

CPS Bypass TSB

 

Curious, was this a recommended service note for all 87-90 MJ's or just those having CPS problems? Any benefits of doing this on an MJ that does not have any CPS issues? Thanks

[cruiser54]

I don't remember. We generally upgraded for sure if it was under warranty. eliminating the c101 connector kinda does the same thing.

Years ago, I used to bypass the c101 connector by going into the loom and soldering the CPS wires together. 

 

[Salvagedcircuit]

1 hour ago, cruiser54 said:

I don't remember. We generally upgraded for sure if it was under warranty. eliminating the c101 connector kinda does the same thing.

Years ago, I used to bypass the c101 connector by going into the loom and soldering the CPS wires together. 

 

All the more reason to bypass and solder the c101. On the to-do list. Thanks.