Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
3.8L BCM Tests W/Codes: Operation: Notes
A combination of inputs from the major components, sensors and switches, communicate together with the BCM. Various inputs to the BCM combine with program instructions within system memory, providing accurate control over all subsystems involved. When a subsystem circuit exceeds preprogrammed limits, a system malfunction is indicated and certain back-up functions maybe provided. The BCM controls subsystems through direct outputs or through data transmitted along the serial data line to one of the other major components. The process of receiving', storing; testing and control- ling information is continuous. The data communication gives the BCM control over the ECM's self-diagnostic capabilities in addition to its own. Between the BCM and the other 4 major components of the computer system, a communication process has been incorpo- rated, that allows devices to share information and thereby provide for additional control capability.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.