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.
Installation
Removal & Installation: ECM: Installation — 1994 Audi S4 Service Manual & Installation >> ECM >> Installation Removal & Installation: ECM: Installation CAUTION: DO NOT connect Motronic ECM with ignition switch in ON position. Ensure that ignition is switched OFF. Connect Motronic ECM harness connector to Motronic ECM. Install Motronic ECM tightly in electronics box. Connect vacuum line to Motronic ECM. Carefully push lower cover into both openings of electronics box and lock in. See Fig 1. Carefully put upper cover into both openings of electronics box. Screw both covers of electronics box to each other. See Fig 2. Cover electronics box with carpeting. Reinstall "A" pillar cover. See Figure. Fig 1: Installing The Motronic Engine Control Module (1 Of 2) [IMAGE: http://127.0.0.1:8080/images25/G00160028/] Courtesy of AUDI OF AMERICA, INC. Fig 2: Installing The Motronic Engine Control Module (2 Of 2) [IMAGE: http://127.0.0.1:8080/images25/G00160029/] Courtesy of AUDI OF AMERICA, INC.
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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.