Dumb Question
Thread Starter
Racer
Joined: Jun 2007
Posts: 312
Likes: 23
From: Massachusetts
Dumb Question
I need to pull the tune out of my C5 and the engine is not completely put together. Its built but no fluids in it. Can I do this by just turning on the accessory drive and not cranking the car over? Using HP Tuners
Uneducated autodidact
Joined: Feb 2001
Posts: 5,413
Likes: 252
From: West of the Sabine, Texas
You might want to look into this.
https://www.amazon.com/Gen-Bench-Dia...f_=as_li_ss_tl
https://www.amazon.com/Gen-Bench-Dia...f_=as_li_ss_tl
Racer
Joined: Sep 2013
Posts: 294
Likes: 284
From: Snohomish, WA
St. Jude Donor '21-'22-'23
Drifting
Joined: Nov 2017
Posts: 1,392
Likes: 303
As long as the car's wiring harness is still intact, I'd expect reading to work just fine. As noted earlier, you don't need to crank, you just need to turn the key to the run position.
The power supply on that bench harness might not be sufficient for writing, but it will work just fine for reading. Some of the 99-03 PCMs (the ones with Intel flash chips) will pull about 0.7 amps when erasing a section of the flash chip, and a weak power supply will let voltage dip low enough to cause the PCM to reboot... after which it won't boot, because a section of the flash just got erased. You can recover from that, but it's tedious and you'll need a stronger power supply.
The power supply on that bench harness might not be sufficient for writing, but it will work just fine for reading. Some of the 99-03 PCMs (the ones with Intel flash chips) will pull about 0.7 amps when erasing a section of the flash chip, and a weak power supply will let voltage dip low enough to cause the PCM to reboot... after which it won't boot, because a section of the flash just got erased. You can recover from that, but it's tedious and you'll need a stronger power supply.
Safety Car
Joined: Oct 2007
Posts: 4,222
Likes: 1,080
From: South Florida
The ECU only needs power to switched, constant, plus ground to boot and connect to a laptop
Switched and constant and ground for this purpose are each just 'one wire' making the total a 3 wires needed for power,
plus the couple wires for communication which is the plug for HPtuners device
Switched and constant and ground for this purpose are each just 'one wire' making the total a 3 wires needed for power,
plus the couple wires for communication which is the plug for HPtuners device
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Thread Starter
Racer
Joined: Jun 2007
Posts: 312
Likes: 23
From: Massachusetts
Drifting
Joined: Nov 2017
Posts: 1,392
Likes: 303
It matters, but I think you'll find that it only fits one of them.
On the car's wiring harness, the connectors have colored plastic clips that have ridges in different places to ensure that they can only be installed correctly.
99-03 cars have red and blue clips.
04 cars have green and blue.
The programming harness will probably come with blue clips.
The top of the PCM has the word "BLUE" embossed on it to indicate which connector fits the blue clips.
On the car's wiring harness, the connectors have colored plastic clips that have ridges in different places to ensure that they can only be installed correctly.
99-03 cars have red and blue clips.
04 cars have green and blue.
The programming harness will probably come with blue clips.
The top of the PCM has the word "BLUE" embossed on it to indicate which connector fits the blue clips.
Safety Car
Joined: Oct 2007
Posts: 4,222
Likes: 1,080
From: South Florida
and pls pay close attn to the pins at the ECU, I feel they can sometimes push back / push out without noticing, back out away from the ecu so it doesn't touch anymore.
It'll be revving up electrical gremlin because of it
Pin contact, and plug tightness / evenness, is finnesse. finesse. there we go
It'll be revving up electrical gremlin because of it
Pin contact, and plug tightness / evenness, is finnesse. finesse. there we go
Thread Starter
Racer
Joined: Jun 2007
Posts: 312
Likes: 23
From: Massachusetts
Thanks Everyone. Worked like a charm. Got the tune out of the car and off the tuner. Now If I can just finish up the steering and suspension I can get the hoses back on and it started.