How do you change the ECM on a car?
How do you change the ECM on a car? Plug in the electrical wires to the ECM. The wiring harness will lock in once it is pushed in far enough. Connect the battery cables to the battery. Tighten the cables with a socket wrench. Start the vehicle and allow it to idle for five minutes. If there are still conflicting codes, the "Check Engine" light will come on. How to replace a PCM ECU on 2003 Dodge Caravan? Disconnect the negative cable from the battery. Remove the battery shield. Unscrew two PCM bolts from the top. 2003 Dodge Caravan PCM,...