GMHighTechPerformance Homepage
 

Flash-Based Factory PCMs - Tech - In A Flash

Factory Pcms
...The E67 picked up even more terminals for total of 202, yet still featured only three connectors.
Factory Pcms
The E38 module is similar to E67s, minus one connector....
Factory Pcms
...Total terminal count was slimmed down to a total of 153 pins between only two connectors.
Factory Pcms
When GM split the powertrain control duties between sovereign units in 2005, the trans commands became the responsibility of a new transmission control module....
Factory Pcms
The new T42 TCM is a relatively tiny thing, compared to older PCM modules. The units feature a single 49-terminal connector. Like the LAN-type ECM boxes, the TCM was designed to never be opened.
Factory Pcms
Starting with the E40, some of the newer LAN-type modules have casting numbers corresponding to their moniker. However, this casting number does not appear on 'all' modules, so consider your box lucky if it got marked. Shown in the red circle is an E67 casting number situated between the fins.
Factory Pcms
Control module terminals have evolved much like the boxes they connect. The small LT1 connector shown horizontally at the bottom was actually fairly similar in style to the Gen III connectors shown on the left, but smaller. The three color Gen III connectors are shown, blue-green-red. The LAN-type controllers were introduced with a new-design featuring more tightly packaged connectors, as shown on the right.
Factory Pcms
Smaller means better when talking OEM controllers. The power and speed increased with each new (and usually smaller) controller. The ECM and TCM in the front are clearly smaller than older Gen III controllers shown in the background.
Factory Pcms
GM's LAN-type controllers all look fairly similar thus far, besides some subtle connector differences. None of these controllers interchange.

Prev | 1  | 2  | 3  | 4  | 5

Discuss in Our Forums
Get Adobe Flash player

Car Pictures

Related Articles
 
1987 Pontiac Firebird - Trial Formula
Check out this Exclusive 1987 Pontiac Firebird Formula, featuring Mufflex 4-inch exhaust, Motown engine, Koni Spa-1 Shocks, centerline wheels, and More!... more
 
LT-1 Ignition System - Getting to Know the Opti-Spark
Editor's Note: Way back in March of 1998, GMHTP ran "Opti-Spark" by Ray Bohacz, an engineering-level dissection of GM's Opti-Spark distributor. This evolutionary ignition component was a bridge... more
 
LT1-Powered Chevy Camaro Z28 - The Final Countdown
Project Grape Of Wrath is at an end, at least for the foreseeable future. The last bolt has been turned so it's time to run the final track tests and for our readers to evaluate the relative success... more
 
Change Machine
Politicos and silver-screen adulation junkies have long recognized that the capacity for reinvention is the cornerstone of longevity. The principle obtains equally in the automotive realm, where... more
 
Pontiac Trans Am - Blown Away Part II
Now that East Coast Supercharging has equipped Project LS1 with the Procharger P-1SC-1, an ATI balancer from Thunder Racing, and all of the relocated stock equipment, it was time to wrap things up.... more
 
Boost, Inc.
A Speed-Inc Built, 850-RWHP Street Terminator... more
 
EFI GM Parts - 2006 Best New Products
Twenty must-have new parts for your late model EFI GM.... more
 
1987 Buick Grand National - 11.20s For $1,900
Check out the upgrades this 1987 Grand National got to boost it into 11.2s.... more
 
1987 Buick GN Turbo V-6 - 10-Second TR
Check out this turbo V-6 install in a 1987 Buick Grand National.... more
 
Aftermarket EFI Systems - Tech - Mr. EFI
Collegiate mechanical engineering curriculum typically requires each student to complete a senior design project. More often than not, these requisite projects are pursued with a level of enthusiasm... more

 

Get Adobe Flash player