When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
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.
Last edited by Andrew Kirk; Nov 29, 2023 at 09:46 PM.
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.
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.
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
Last edited by Andrew Kirk; Nov 30, 2023 at 10:49 AM.
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.
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.
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.
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
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.
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.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
C5 PCM Questions 
