Blue and green pcm

Privacy Terms. Quick links. Are both class II data and will the newer ones work with the same functionality as the ? I ask as the Van with the 6. The same upgrade was rolled out on the car side in Vette and GTO. The flash memory was now doubled from kilobytes to kilobytes, to help facilitate further expansion of control coding.

Externally, the new PCM was identifiable by its 'green' connector replacing the 'blue' connector found on ''02 PCMs. This PCM would remain basically unchanged through its remaining usage up to However, several service codes existed due to internal manufacturing or sourcing changes, such as Intel-brand flash memory or AMD-brand flash memory.

This brand-swapping was fairly transparent to the user, but caused tuning and diagnostic tools to be re-designed to ensure compatibility. The service codes for ''07 include,and These PCMs are interchangeable, with a complete re-flash of the appropriate operating system.

Thanks to its fast processor and large memory, this PCM is considered the optimal choice for LS1 transplants. Byfederal law requires all factory controllers to be controller area network CAN based. The totally new engine control module ECMdubbed E40, still used a processor from the Motorola series, but a newer and faster version. Flash memory size remained 1 megabyte, the same as existing LS1 PCMs, but it was a newer generation of flash. The increases in performance were complemented with a radical reduction in size as well.

Following the nature of electronics evolution, the new box was drastically smaller than its predecessor, and also featured highly compacted, smaller connectors.

The E40 also only controls the engine. Transmission control was separated out to a new stand-alone controller, the transmission control module TCMnamed T Yet both new units combined were still much smaller than one combination LS1 controller. The new TCM is also a flash-based unit, featuring 1 megabyte of memory. The E40 would only serve two years as a GM controller between '05 and ' So the question becomes: Since the new CAN based controllers are separated out for the engine and trans, would it be beneficial to use these in an LS swap considering future technology?

The only thing the PCM does is control the engine and trans. However it would broadcast information for the guages and airbag controller.Installation Tools Needed. Installation Instructions 1. Trimming of the junction box must be done to get it to close. Locate the green wire. Once you tap it, use your test light or volt meter to recheck and confirm proper operation fig. Use the small flat head to pry the grey retaining tabs out. Flip the connector over and Remove the PCM. The black cover should pull off by pulling outward on the cover, releasing from the two plastic tabs.

Take your 7mm socket remove the blue PCM connector closest to the engine. Gently push Blue 42 trigger through pin 42 on the PCM until it secures itself. You can see it though the clear plastic. It should should line up and look uniform like the rest of the pins.

blue and green pcm

Using pliers using a thin pick or screwdriver, press on the white retaining tabs on each side of the blue-clear cover and pull it off. Be sure to secure the wires using tie straps. Tug them both to confirm they are tight.

Start the truck. Turn the AC on. If not, re trace your steps. If so go to step 3. Paying attention to the temp guage, when the engine coolant reaches the desired turn on value in the PCM set by the tuner that tuned the PCM, the other fan will turn on high and you will see 2 fans hi operation.Here is some helpful information if you want to modify your stock truck wiring harness your self This junction block is part of the main engine harness, that screws into the bottom of under-hood fuse block.

If you want to use the whole fuse block you can, but I like to keep it clean, and wire a lot of these together.

There are a lot of wires here. Each injector has its own power wire all the way to this block. All 8 of them can be wired together into a single fuse to clean things up. This is what is done inside the fuse block. Be sure to look at the pictures of the harness at bottom of this page.

blue and green pcm

That is all to get a much cleaner look, and to simplify things later on if you have to troubleshoot anything. Provide fuel pressure to the rails, turn engine over with starter, and it will run! This would be the most basic simple way to run. There are signals for brake switch, tow haul, all of which are found in the connectors near the fuse block connector.

I don't recommend just combining all the pink wires into one and powering it. You are asking for issues if there is ever a short, including melted wires, fire, so on. Click for info. Oxygen Sensor types information - Page about the different o2 sensors used, differences in wiring, and function. Pinouts, Pictures, Video! You can also download this in a PDF printable file with all my notes.

Thanks Paul C. Low Quality 3. Now adding videos to my YouTube channel. There will be more to come. If you want to run without the large under hood fuse block, following info might help to see which wires go where. This is C2 - Underhood Fuse Block connector.

This connector is part of Engine Harness. If you look closely on you're harness, this plug has the letters and numbers printed on the plug. C, black, 3 wires. Click Year for Pinouts for Truck Harnesses. Some of the wires inside these links are made BOLD. This typically means this wire is needed or very useful in a stand alone harness setup.

C2 information is in these links. Info is more complete for Later years should be similar, use circuit 's to compair. Aroundthe engines no longer had EGR, so that does away with 5 wires. The differences in the 's don't matter a bit when making a harness stand alone. Very detailed info for what to remove, keep, etc is just a few lines down, I leave all this info so you can see changes year to year if you lik.

All the grounds needed will be in the engine harness. Should be a few of them. Rear of engine behind intake, should be two grounds. For !!Remember Me? What's New? Results 1 to 8 of 8.

blue and green pcm

Thread Tools Show Printable Version. Hey guys, I swapped a LQ4 6. I bought this setup complete wiring, accessories, computer the whole 9 yards and the Van setup came from the factory with cable operated throttle body but no matter what I do in the programming I can't affect the idle speed. So the thing won't idle worth shit when cold and will stall darn near every time I turn the AC on as the computer seems to make no attempt to open the IAC valve to control the idle.

Everything else I have tuned in and runs very strong but this idle is annoying. I have the throttle stop set where it idles a bit high when warm to get it to idle pretty quickly cold but still stalls nearly every time if I turn the AC on. From the looks of the wiring diagrams there appears to be some ground wires on the green plug that isn't utilized on the red plug PCM's but that appears to be about it.

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Here are my wiring diagrams. Originally Posted by Google. Steve Williams TunedbyFrost. Originally Posted by Frost. Originally Posted by Link Above. I just want to make sure that I change the right pins so I don't fry the new pcm or cause myself another issue that i have to figure out. Originally Posted by brharris Its a conundrum which is why I want to change computers as I have plenty of pcms and if the wiring changes are as easy as it appears then I shouldn't have a problem and so I wondered who has done it and how hard was it.

All times are GMT The time now is AM.Trying to do an electric fan conversion. From what I have read, most people use pin 42 only, why? Can anyone explain the functions of pin 33 and 42? Does the PCM turn off the fans when a certain vehicle speed is reached? Both fans do not come on when vehicle speed is above 45 mph or so. Does the same hold for pre trucks? Thank you. Read the Manual! When the PCM wants the fans to come on at low speed it grounds the green wire pin 42 ; when it wants high-speed fan operation, it grounds BOTH the green and blue wires.

Our draft document is correct for ''04 PCMs, we need more practical testing and research on ''02 PCMs, they're a little different on the high-speed triggering. I am not completely up to speed on the pre PCMs, I have been meaning to leech all the knowledge on this from a couple other truck forums.

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You seem to be very informed on the E-fans. I have read that only pin 42 will work though. I would like to have the fans operate exactly like OEM, or however your manual states. Will my pins 42 and 33 work or will just 42? If they both wont, will an 05 PCM do the trick? That depends on weather western set the fan operation as parallel or auxilary. If the former, you can use both trigger wires and be set like if it was stock.

Hi Keith - welcome to the forum.

You will have to discuss your issue with Westers, but the steps we took to program the fans is included in our manual, which can be downloaded from here. You can post now and register later. If you have an account, sign in now to post with your account.

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GM LS-Series PCM/ECM: Comparing Gen III Controllers

Clear editor. Upload or insert images from URL. Recommended Posts. Report post. Posted June 25, edited. Edited June 25, by bssfan. Share this post Link to post Share on other sites. Posted June 25, Thanks a lot Mr. This clears everything up! Posted August 3, Here are some very important safety precautions when testing the wires coming out of the PCM connectors. I've made every effort to double and triple check the above info and in the next couple of pages and I've used the best sources to compile it but nothing in life is perfect.

I don't have a staff of proof readers or editors, I'm just a little guy typing this stuff up in my spare time to help and give back to the Do-It-Yourself community. So without further ado, here's my disclaimer:. If you do spot errors, please let me know. You can use the contact form at the end of the article.

As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem!

Page 1 Page 2 Page 3 Page 4. Each connector can be identified as: C1 Blue 32 Pin Connector. C2 Red 32 Pin Connector. C3 Clear -or Grey- 32 Pin Connector. C4 Black 24 Pin Connector. Contents of this tutorial:. All Articles: 4. Applies To:. Chevrolet Vehicles:. Do NOT follow this link or you will be banned from the site!Select an option We do not provide a shipping label for you! You must be able to provide proof of harness purchase!

No two engines run exactly alike. Most factory, non modified engines will run as they should. However, even a swap with a factory engine will benefit greatly from a dyno tune — especially if you are running a 4L60E or 4L80E. All applications we tune can experience small drive-ability issues or a slightly higher idle.

These can range from a stall on sudden stops to bucking under very slow cruising speed. While most do not experience anything like this, some do. This is where the vehicle can be tailored to run exactly how you want. BP Automotive is not responsible for any form that is filled out incorrectly. Only logged in customers who have purchased this product may leave a review. LS1 LSX 4.

Add to Wishlist. Gear Ratio Example — 3. We remove all of the factory components that will not be used for standalone operation and tune for your application. Reviews There are no reviews yet.

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