Andrew Kirk

I'm currently rewiring my harness and working on the fuse block. I have a C5 09354896 PCM and have a couple questions.
1) Looking at some f-body PCM pinouts, it looks like there's two PCM Ignition pins at Blue 19 and 75. The pinout diagram for the C5 only shows a single PCM Ignition at Blue 19. I just want to confirm that is the only pin I should consider moving in to the fuse block or am I missing something?
2) I'm converting to DBC since I already have a DBC throttle body (engine didn't come with a TB). I removed the 6 wire DBW TPS wiring and am now working in the new 3wire TPS sensor. I'm following the guide at https://lt1swap.com/cable_conversion.htm. It shows that the 5V ref and low ref pins go to Blue 8 and 60 respectively, but for the blue/green PCM connectors. After the table showing the pins, Brendan says if converting DBW to DBC on red/blue connectors to the schematic he linked (also shown below). Reading this I see the sensor signal wire going to pin 24. I'm not sure if the other two pins go to the red or blue but my issue is that on either connector, the pins 46 and 54 are occupied. Right now this is what's in those pins:
Blue 46: None
Blue 54: MAP Sensor Ground

Red 46: MIL
Red 50: VSS Output
So I'm a bit confused where to pin the new 3wire TPS. Any help is greatly appreciated.

oange ss

iTrader: (50)

TPS circuits are in different locations between Blue/Green and Red/Blue. Wire according to the OS youre using. Fbody switched 12v is only at C1 19, C1 75 is unused, not sure where you got that info.

Andrew Kirk

Whoa brainfart. I could have sworn C1 75 had something. It's been a couple long nights and my note taking clearly suffered
As far as the TPS, it looks like the throttle actuator control TAC module handled all TPS signals. The C5 PCM pinout doesn't show anything for TPS, only for throttle actuator serial data. Is the TAC specific to corvettes? Maybe I need to flash my PCM to support added TPS pins

Actually, looking at the chart here is where I must have gotten that idea. I'm not sure why Blue 19 is highlighted blue since Brendan indicates that is something to be added. Looks like he also added a wire at Blue 75.
https://lt1swap.com/99-02_vortec_pcm.htm

oange ss

iTrader: (50)

No standard C5 had DBC, that im aware of; will need Z06 file to convert to dbc

RonSSNova

iTrader: (3)

All C5’s were DBW.
If you are doing an engine swap with DBC, the 02 Camaro is the tune file to use.
Have that written into your ECU. Then use a Camaro harness.

Andrew Kirk

Thanks for the help. I forgot to mention this is a C5 engine going into a 88 rx7.

Okay, I'll use the Camaro tune file to enable DBC. Now to rewire to match the Camaro pinout

dlwilson

iTrader: (1)

I will second using a 2002 Camaro bin file. I also got a C5 engine without the TAC module ($500!) so I put a DBC throttle body from a Camaro on. I rewired the harness using the Camaro pinouts, so the engine is effectively an aluminum Camaro engine. I'm running the stock 2002 Camaro bin minus VATS loaded onto the C5 PCM using TunerPro RT and PCM Hammer.

G Atsma

ALL Camaro engines are aluminum....

Andrew Kirk

The Corvette tax is pretty awful! That's really reassuring though, thanks. One thing I'm stumped on is that the C5 PCM has pins available for Oil Pressure, but when looking at Camaro diagrams, I don't see anything. All I need is ground and 5V, so can I just hijack one of the available pins for that?
https://www.mrk-motorsports.com/pdf/...%20Pinouts.pdf

oange ss

iTrader: (50)

Fbody platform didnt utilize the oil pressure sensor option. Activate Oil pressure sensor in the System Options tab and run the corresponding circuits, Rumor has it, the PCM calibration is for a C5 0-130 psi sensor, so a typical 0-100 psi pressure sensor wont work. I havent tested this theor tho.

RonSSNova

iTrader: (3)

I added the wiring to an 0411. Works perfect if you use any ORM LS oil pressure sensor.
If you use a 100 psi sensor, you simply need to do some math in the scanner.

I actually use it for fuel pressure.