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.
1982 Pontiac Firebird L4-151 2.5LFACTORY OEM SERVICE PROCEDURE
Engine Control Module: Service and Repair
Removal/Installation
1. Disconnect battery ground cable.
2. Disconnect two ECM electrical connectors.
3. Remove the ECM mounting hardware.
4. Remove ECM from passenger compartment.
Note: Replacement ECM is supplied without engine calibration unit(s) (PROM, MEM-CAL, CALPAK) and care must be taken when removing the calibration unit from a defective ECM as it will be used in the replacement ECM. PROM - Programmable Read Only Memory Calibration units are not interchangeable and must be installed in some position and direction as in the original ECM.
5. Reverse procedure to install.
Start engine, enter diagnosis and check for code 51. If code 51 does not display, calibration unit is installed correctly. If code 51 is displayed, calibration unit is installed incorrectly and must repeat procedure.
Factory Service Tools
Use the Manual With the Right Hardware
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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.