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The 1987 Chevy S10 2.5L typically only has one Engine Control Module (ECM), also known as the Powertrain Control Module (PCM). However, it is possible that some variations or modifications of the vehicle may have additional control modules for specific functions, such as the transmission control module (TCM), body control module (BCM), or anti-lock brake system module (ABS), but these are not considered part of the engine control system.
Transmission control module is part of the PCM - powertrain control module . Engine an transmission module all in one . It's in the engine compartment .
Powertrain Control Module (PCM) 4.8L,5.3L,6.0L
Near the left front inside the engine compartment
... V6 > Electrical > Body Control Module (BCM). 1999 CHEVROLET BLAZER 4.3L V6 : Electrical : Body Control Module (BCM), Price, Core, Total, Add to Cart ...
if you mean modulator, it is usually held in place with a "U" style mounting bracket retained by one bolt at the side of the trans...will have vacuum hose attached...
Please verify the year of your truck. A 2003 Chevy Trailblazer has a 4L60E transmission. This transmission does not have a vacuum modulator valve. The 4L60 uses a vacuum modulator valve but the last year for that transmission was 1992. The perpose of the modulating valve is to control/regulate line pressure. The line pressure in a 4L60E is computer controlled or controlled electrically.
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