Modifing GMPP Connect and Cruise Wire Harness

[AMack]

I am installing a GM LS3 Crate motor with the Connect and Cruise wire harness. I want to shorten the Electronic Throttle Control (ETC) connector and the Accelerator Pedal Sensor (APS) cables for a clean fit. The GM instructions (19171935) specifically state:

"DON'T: Change or alter any wiring in the accelerator pedal or electronic throttle systems."



Does anyone know why shortening the wires would affect the systems?

Do you think is safe to shorten the wires?

[raustinss]

Why can't you tuck them up under the dash... sorry if that sounds dumb I'm not totally familiar with where exactly the connectors would be located which yes I can see would cause a packaging issue

[parsonsj]

Do you think is safe to shorten the wires?

Yes, it's safe. Shorten them by getting new pins and shortening on the connector end and using proper crimping technique, along with keeping the coaxial sheathing. Do not shorten them by cutting and soldering, or cutting and crimping with barrels. I'd guess GM doesn't trust most people's crimping techniques, or being able to find new pins, or maybe the instructions were written with the Toyota pedal problems on front pages of every newspaper.

But: it may affect your warranty, so do a quality job that isn't detectable by inspection.

[Mkelcy]

I did it as John suggests; no problems at all.

[Samckitt]

I have added circuits to it for reverse lockout on T56 transmission, AC pressure switch & pwm fan control. But didn't modify the throttle control circuit.

[AMack]

Thanks for the responses. Like to keep the wiring clean and tidy.

[79loserbluebu]

You can shorten the wires either by doing what was posted above or carefully cutting the connector and splicing the wires together. Note that it most likely will void the warranty of the harness and a poor job can be a diagnostic nightmare.

The reason they don't want any modifications is because the throttle position circuits are 5v, and 5v circuits are extremely sensitive to any high resistance. I have had to restring APP circuits in vehicles because of high resistance.

[MonzaRacer]

What I like to do for splicing any newer txl auto wire is I use the 4 to 1 shrink tubing with glue from Napa. I'll post part number later. When I splice or repair with I use standard crimp terminal matrix on my crimper. It looks just like factory but I use standard elcheapo split crimp terminals with plastic removed. I then solder the connection to remove any chance of higher resistance. I also stagger the repairs. After soldering I use the shrink tubing too protect and reinforce the repair.
I'll post pictures as to how and why and what my repair looks like.
I have been doing repairs like this since I worked for GM dealer about 20yrs ago.
Semi permanent repairs can be done using crimp and seal terminals. But I prefer my way as its more permanent and less apt to cause a high resistance.