Driveability for the experienced., Diag codes 35, 42. Options

[ScottDavid]

Hello Toyota enthusiasts.

Well Long story short Im obviously new here. Not to working on cars....New to Toyota though.

I swapped a 93 jap spec 3sgte into a 96 gt celica. Runs great but after a la hot of test driving and quality checking I had only two diag codes.

35 - Turbo Charging pressure sensor signal
42 - Vehicle speed sensor signal.

As far as the T/C pres sensor. I have a steady 4.98v reference while idling, cruising and boosting.
I have a varying signal voltage with is .1682v @ light throttle which will increase with load to WOT @ 4.97v
The ground circuit is always grounded.

Now, as far as driveability, I noticed that while the engine is normal operating temp its boosting fin, 7-10 psi.
Great performance!

After the engine is fully warm....I was WOT and felt a slight loss of acceleration along with a slight drop in boost. And after the check engine light. max boost 6-7 psi.

Now, The wiring is all cherry, because I did it. My continuity checks are fine from sensor to ecm.

Ok, so the stock 3sgte jap spec vehicle has a turbo gauge built into the cluster....I dont have the stock cluster, I have an aftermarket gauge.

As far as code 42.....Have not tested yet.

Has anyone had this issue or has info on my driveability issue? I will appreciate it.

-Scott

[lagos]

That sensor is ONLY used for fuel cut. By disconnecting the vac line, all you are doing is eliminating fuel cut. You could also BUY a fuel cut defender, that lets you keep your fuel cut, but just raise it.

i believe i might know already but what exactly causes fuel cut? is this something all 3sgte swappers experience?

Fuel cut is a safety feature that cuts off the fuel once you boost over 12psi.